Iranian Polymer Journal最新文献

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Temperature-dependent storage modulus of polymer nanocomposites, blends and blend-based nanocomposites based on percolation and De Gennes’s self-similar carpet theories 基于渗流和 De Gennes 自相似地毯理论的聚合物纳米复合材料、共混物和基于共混物的纳米复合材料随温度变化的存储模量
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-25 DOI: 10.1007/s13726-024-01300-1
Reza Mohammadi, Esmail Sharifzadeh, Neda Azimi
{"title":"Temperature-dependent storage modulus of polymer nanocomposites, blends and blend-based nanocomposites based on percolation and De Gennes’s self-similar carpet theories","authors":"Reza Mohammadi,&nbsp;Esmail Sharifzadeh,&nbsp;Neda Azimi","doi":"10.1007/s13726-024-01300-1","DOIUrl":"10.1007/s13726-024-01300-1","url":null,"abstract":"<div><p>Temperature-dependent storage modulus of polymer nanocomposites, blends and blend-based nanocomposites was studied using both analytical and experimental approaches. The analytical strategy comprised modeling the thermomechanical property of the systems based on parameters affecting the conversion degree of polymer chains in state-to-state transitions and mechanical characteristics of the polymer/polymer interface. Accordingly, percolation theory was developed to define the order of conversion rate and conversion degree of polymer chains considering the thermomechanical characteristics of the neat polymer matrix, behavior of nanoparticles in the system and formation of polymer/particle interphase region. The effect of interphase on a temperature-dependent conversion of polymer molecules was estimated based on De Gennes’s self-similar using the molecular characteristics of the adsorbed polymer chains and related scaling factor. To validate the model predictions, different neat, blend, nanocomposite and blend-based nanocomposite samples were prepared using high-density polyethylene, polyethylene terephthalate and hollow graphene oxide nanoparticles, where needed, and subjected to dynamic mechanical thermal analysis and other required tests. Besides providing acceptably accurate predictions in the case of all neat and nanocomposite samples, the model was proved to be independent of the system’s morphological variation.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"877 - 890"},"PeriodicalIF":2.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140302899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contribution of graphene oxide obtained from exhausted batteries in polypropylene compositions: mechanical, thermal and rheological properties 从用完的电池中提取的氧化石墨烯在聚丙烯成分中的贡献:机械、热和流变特性
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-24 DOI: 10.1007/s13726-024-01301-0
Paola A. Tarachuque, Ana P. Knopik, Reinaldo Y. Morita, Paulo R. S. Bittencourt, Luís A. Pinheiro, Jarem R. Garcia, Alex V. Pedroso, Juliana R. Kloss
{"title":"Contribution of graphene oxide obtained from exhausted batteries in polypropylene compositions: mechanical, thermal and rheological properties","authors":"Paola A. Tarachuque,&nbsp;Ana P. Knopik,&nbsp;Reinaldo Y. Morita,&nbsp;Paulo R. S. Bittencourt,&nbsp;Luís A. Pinheiro,&nbsp;Jarem R. Garcia,&nbsp;Alex V. Pedroso,&nbsp;Juliana R. Kloss","doi":"10.1007/s13726-024-01301-0","DOIUrl":"10.1007/s13726-024-01301-0","url":null,"abstract":"<div><p>Particulate matter and volatile organic compounds pose severe threats to human health. Therefore, in this study samples of polypropylene/graphene oxide with varying compositions were prepared for to be tested in automotive sector. Graphene oxide was obtained through an electrochemical exfoliation of graphite recovered from exhausted batteries. The preparation of the composites was performed using graphene oxide at ratios of 0.3%, 0.7% and 1.0% (w/w), already diluted in a hyperdispersant agent. The composites were compared to both pure polypropylene and polypropylene/carbon black composites. The samples were characterized based on their melt flow index, thermal stability, crystallinity, flammability, and mechanical and rheological properties. The formulations containing graphene oxide obtained from the recycling of exhausted batteries exhibited superior thermal properties and melt flow index compared to pure polypropylene. In addition, the composites containing 0.7% of graphene oxide showed an increase in flow index compared to the composite containing carbon black. The rheological properties of samples containing graphene oxide had values closer to pure polypropylene compared to those containing only hyperdispersant or carbon black. The increase in the flow index of a composite containing graphene oxide can result in energy cost savings during processing. Polypropylene/graphene oxide composites present an interesting alternative by replacing carbon black with recycled graphene oxide, both in terms of costs and environmental impact, aligning with the principles of green chemistry.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"955 - 964"},"PeriodicalIF":2.4,"publicationDate":"2024-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface modification of membrane bioreactor by hybrid halloysite nanotubes for industrial wastewater treatment containing heavy metals 用混合埃洛石纳米管对膜生物反应器进行表面改性,以处理含重金属的工业废水
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-22 DOI: 10.1007/s13726-024-01298-6
Sajjad Gorjizadeh, Masoud Rahbari-Sisakht, Daryoush Emadzadeh
{"title":"Surface modification of membrane bioreactor by hybrid halloysite nanotubes for industrial wastewater treatment containing heavy metals","authors":"Sajjad Gorjizadeh,&nbsp;Masoud Rahbari-Sisakht,&nbsp;Daryoush Emadzadeh","doi":"10.1007/s13726-024-01298-6","DOIUrl":"10.1007/s13726-024-01298-6","url":null,"abstract":"<div><p>Surface modification of polysulfone (PSF) membrane bioreactor using hybrid halloysite nanotubes (HHNTs) and dendrimers was investigated for industrial wastewater treatment containing heavy metals. Petroleum wastewater was obtained from liquefied gas plant 1200 (NGL 1200) in Gachsaran, Iran. Polysulfone)PSF( membranes were fabricated using hybrid halloysite nanotubes and dendrimers at different concentrations of 0, 0.5, 1, and 2 wt% and identified with certain codes of PSF, HNT0.5, HNT1, and HNT2, respectively. The fabricated membranes were characterized by FTIR, AFM, EDX, SEM, and contact angle analyses. The contact angle decreased as a result of HNT loading in PSF membranes, which was due to the enhancement of the membrane hydrophobicity. The heavy metal rejection in the HNT1 membrane for Cu (II), Pb (II), Ni (II), and Zn (II) was 83.25%, 98.79%, 81.09%, and 85.98%, respectively. Also, the rejection of Ni (II) in PSF was 38.24% which showed a lower amount. Based on the results, the HNT1 membrane which was fabricated using 1 wt% of the hybrid halloysite nanotubes showed the best performance to heavy metals removal from industrial effluents.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"1001 - 1016"},"PeriodicalIF":2.4,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140201983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring the impact of void content and hygrothermal aging on the performance of carbon/epoxy composite laminates: a comprehensive study 探索空隙含量和湿热老化对碳/环氧复合材料层压板性能的影响:一项综合研究
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-20 DOI: 10.1007/s13726-024-01295-9
Abd Baghad, Khalil El Mabrouk
{"title":"Exploring the impact of void content and hygrothermal aging on the performance of carbon/epoxy composite laminates: a comprehensive study","authors":"Abd Baghad,&nbsp;Khalil El Mabrouk","doi":"10.1007/s13726-024-01295-9","DOIUrl":"10.1007/s13726-024-01295-9","url":null,"abstract":"<div><p>The effect of voids and aging on the moisture absorption behavior, diffusion characteristics, and thermomechanical and mechanical performance of autoclaved laminates has been investigated. However, a series of 12 laminates based on HexPly 8552S/AS4 prepregs were manufactured by varying the autoclave process parameters to create laminates with different void contents and subjected to conditioning and aging processes. The moisture absorption behavior was evaluated, and a Fickian diffusion model was employed to describe the moisture absorption process. The results showed that void content influenced the moisture absorption rate, resulting in faster absorption rate. Hygrothermal aging decreased the glass transition temperature (<i>T</i><sub>g</sub>), indicating a loss of rigidity in the laminates. The decrease in <i>T</i><sub>g</sub> varies between 9.08 and 12.57%, with an average decrease of 10.62 ± 1.25% compared to samples not subjected to aging. Aging also affected the laminate’s compressive modulus, with a reduction ranging from 6.99 to 10.65%. In addition, the laminate’s compressive strength decreased from 12.7 to 19.2%, while interlaminar shear strength experienced a reduction from 16.8 to 25.7%. These results indicate that these properties were negatively impacted after the aging process. On the other hand, the presence of voids does not appear to play a significant role in the observed reductions in mechanical and thermomechanical properties. These findings provide valuable insights into the detrimental effects of voids and aging on the properties of carbon/epoxy composite laminates.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 6","pages":"827 - 837"},"PeriodicalIF":2.4,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel chemical route for low-temperature curing of natural rubber using 2,4 dihydroxybenzaldehyde: improved thermal and tensile properties 使用 2,4-二羟基苯甲醛对天然橡胶进行低温硫化的新型化学方法:改善热性能和拉伸性能
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-18 DOI: 10.1007/s13726-024-01297-7
Bote Vaishali Raosaheb, Anand Adeppa, Sudhakara Aralihalli, Ekwipoo Kalkornsurapranee, Akarapong Tuljittraporn, Arthittaya Chuaybamrung, A. V. Vijayashankar, Jobish Johns
{"title":"A novel chemical route for low-temperature curing of natural rubber using 2,4 dihydroxybenzaldehyde: improved thermal and tensile properties","authors":"Bote Vaishali Raosaheb,&nbsp;Anand Adeppa,&nbsp;Sudhakara Aralihalli,&nbsp;Ekwipoo Kalkornsurapranee,&nbsp;Akarapong Tuljittraporn,&nbsp;Arthittaya Chuaybamrung,&nbsp;A. V. Vijayashankar,&nbsp;Jobish Johns","doi":"10.1007/s13726-024-01297-7","DOIUrl":"10.1007/s13726-024-01297-7","url":null,"abstract":"<div><p>A novel method for chemically curing natural rubber (NR) using 2,4-dihydroxybenzaldehyde (DHB) at low temperatures has been discovered. Adding varying amounts of DHB to NR increases the crosslinking between the NR molecular chains. The chemical reaction between NR molecular chains and DHB was confirmed through Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (NMR) spectra. From the thermogravimetric analysis (TGA), the thermal stability and activation energy of degradation were determined. The variation in glass transition temperature (<i>T</i><sub>g</sub>), as an indication of increased crosslink density, reducing the mobility of rubber chains, has been confirmed through differential scanning calorimetry (DSC). The addition of DHB to latex significantly enhanced the thermal stability of the rubber. An increase in the activation energy of 5.52% was observed upon the addition of 80 mL DHB into NRL when compared to the uncured one. Furthermore, the tensile properties, in terms of tensile strength and modulus of elasticity of rubber, were drastically increased through DHB crosslinking. Tensile strength values of rubber were found to increase by reducing its elongation at break due to the formation of crosslinks between the macromolecular chains. NR cured with 80 mL DHB exhibited superior tensile and thermal properties among the series of cured samples. By adding 80 mL of DHB, the tensile strength increased by 390% and the elongation at break decreased by 10%. The advantage of this curing method is that, it is an effective technique for crosslinking NR directly from NR latex at comparatively low temperature.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"915 - 925"},"PeriodicalIF":2.4,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140154235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of visible light catalyst Ag6Si2O7–TiO2 with core-shell nanostructure on performance of poly(vinylidene fluoride)-g-poly (ethylene glycol) methyl ether methacrylate/poly(vinylidene fluoride) high flux ultrafiltration membranes 具有核壳纳米结构的可见光催化剂 Ag6Si2O7-TiO2 对聚(偏氟乙烯)-聚(乙二醇)甲基醚甲基丙烯酸酯/聚(偏氟乙烯)高通量超滤膜性能的影响
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-18 DOI: 10.1007/s13726-024-01299-5
Yulan Tang, Xianyuan Sun, Xiankun Zhang, Dongrui Zhou, Ting Li
{"title":"Effect of visible light catalyst Ag6Si2O7–TiO2 with core-shell nanostructure on performance of poly(vinylidene fluoride)-g-poly (ethylene glycol) methyl ether methacrylate/poly(vinylidene fluoride) high flux ultrafiltration membranes","authors":"Yulan Tang,&nbsp;Xianyuan Sun,&nbsp;Xiankun Zhang,&nbsp;Dongrui Zhou,&nbsp;Ting Li","doi":"10.1007/s13726-024-01299-5","DOIUrl":"10.1007/s13726-024-01299-5","url":null,"abstract":"<div><p>Combining photocatalysts are frequently used to address the issue of poly(vinylidene fluoride) (PVDF) membranes being susceptible to contamination. The main constraints of existing photocatalyst-modified films are the narrow light utilization range and the generally limited enhancement of hydrophilicity and flux of the films modified by a single photocatalyst. Herein, a novel visible light photocatalyst Ag<sub>6</sub>Si<sub>2</sub>O<sub>7</sub>–TiO<sub>2</sub> with a core–shell nanostructure and a large specific surface area was prepared by in situ deposition. The casting solution was supplemented with Ag<sub>6</sub>Si<sub>2</sub>O<sub>7</sub>–TiO<sub>2</sub> and 1.35 g PVDF-<i>g</i>-poly (ethylene glycol) methyl ether methacrylate (PEGMA) prepared by ATRP and then a film through non-solvent-induced phase transformation was prepared. M1 with 0.25 g Ag<sub>6</sub>Si<sub>2</sub>O<sub>7</sub>–TiO<sub>2</sub> has ideal overall performance in filtration of pure water and 20 mg/L SA solution. Its pure water flux, recovery flux, and rejection were found to be 1471 and 1091 L/(m<sup>2</sup> h), and 88.1%, respectively. Additionally, M1 has the best-increased flux by 20.3% greater under visible light (VIS) irradiation than under shading condition. To measure changes in flux and rejection under three conditions (shading, UV light, and VIS light), M1 was chosen as the representative membrane. There is no significant difference in filtering performance between UV and VIS, nevertheless, both are much better than no light. The photocatalytic degradation impact of M1 on ceftiofur sodium was next examined under UV and VIS circumstances, and the degradation effect of M1 under the two conditions was good and comparable, approximately 70% and 65%, respectively. It indicates that the modified membranes have excellent VIS responsiveness, flux, and anti-pollution performance.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"981 - 1000"},"PeriodicalIF":2.4,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140168863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on association behavior and solution properties of poly(acrylic acid-alkyl polyoxyethylene acrylate) amphiphilic copolymers 聚(丙烯酸-聚氧乙烯丙烯酸烷基酯)两性共聚物的分离行为和溶液特性研究
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-15 DOI: 10.1007/s13726-024-01296-8
Xiqiu Wang, Zhiqing Zhang, Yukun Zhang, Guodong Zhang, Fang Wang
{"title":"Study on association behavior and solution properties of poly(acrylic acid-alkyl polyoxyethylene acrylate) amphiphilic copolymers","authors":"Xiqiu Wang,&nbsp;Zhiqing Zhang,&nbsp;Yukun Zhang,&nbsp;Guodong Zhang,&nbsp;Fang Wang","doi":"10.1007/s13726-024-01296-8","DOIUrl":"10.1007/s13726-024-01296-8","url":null,"abstract":"<div><p>Hydrophobically associating water-soluble polymers (HAWSPs), which possess surfactant and polymer properties, are extensively studied. This research work presents a novel HAWSP, poly(acrylic acid-alkyl polyoxyethylene acrylate) (P(AA-AAEO<sub>n</sub>)), synthesized by aqueous polymerization of acrylic acid and alkyl polyoxyethylene acrylate (AAEO<sub>n</sub>) with various ethoxy groups. The structure of P(AA-AAEOn) was characterized using Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. The association behavior in the solution was also evaluated through surface tension, dynamic light scattering, and rheology measurements. The findings exhibited that P(AA-AAEO<sub>n</sub>) demonstrated noteworthy surface activity, which was amplified as the proportion of the hydrophobic group increased and could effectively reduce the water surface tension. When the concentration reached 0.01%, P(AA-AAEOn) in the solution changed from intramolecular association to intermolecular association. Additionally, P(AA-AAEO<sub>n</sub>) manifested notable shear resistance, shear recovery, and viscoelasticity, transitioned from energy elasticity to entropy elasticity in P(AA-AAEO<sub>n</sub>) molecules between 25 and 35 ℃. The experimental phenomena and mechanisms resulting from the association behavior of polymer molecules have undergone careful analysis. The elastic conversion of polymer molecules at varying temperatures is a noteworthy finding, which has not been extensively documented in earlier research works. A detailed analysis of this phenomenon has been conducted. However, further research is crucial to establish the prevalence of this phenomenon in HAWSPs.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"943 - 953"},"PeriodicalIF":2.4,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140154302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of vinyl acetate/dibutyl maleate copolymers on gas transport properties of poly(ethylene oxide-b-amide 6) membranes: a comprehensive study on permeability, diffusivity, solubility, and permselectivity of carbon dioxide 醋酸乙烯酯/马来酸二丁酯共聚物对聚(环氧乙烷-b-酰胺 6)膜气体传输特性的影响:关于二氧化碳渗透性、扩散性、溶解性和过选择性的综合研究
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-14 DOI: 10.1007/s13726-024-01290-0
Marzieh Shirinia, Mahdi Abdollahi, Mohammadreza Omidkhah
{"title":"Effect of vinyl acetate/dibutyl maleate copolymers on gas transport properties of poly(ethylene oxide-b-amide 6) membranes: a comprehensive study on permeability, diffusivity, solubility, and permselectivity of carbon dioxide","authors":"Marzieh Shirinia,&nbsp;Mahdi Abdollahi,&nbsp;Mohammadreza Omidkhah","doi":"10.1007/s13726-024-01290-0","DOIUrl":"10.1007/s13726-024-01290-0","url":null,"abstract":"<div><p>Poly(ethylene oxide-<i>b</i>-amide 6) (PEBAX<sup>®</sup> 1657) blend membranes containing 10, 30, and 50% (by weights) of dense and rubbery vinyl acetate/dibutyl maleate (VAc/DBM) copolymers with different chemical compositions as CO<sub>2</sub>-philic additives were made by solution casting method and were studied for the separation of CO<sub>2</sub>/CH<sub>4</sub> and CO<sub>2</sub>/N<sub>2</sub> gas systems. Chemical interaction, thermal properties, and morphology of the membranes were investigated using FTIR, DSC, and FE-SEM analyses, respectively. The solubility coefficient of carbon dioxide as well as the solubility selectivity showed an upward trend with the addition of vinyl acetate-based copolymers, especially at 50% (by weight). In the membranes containing 10 and 30% (by weights) of vinyl acetate-based copolymers, both key factors of solubility and diffusion coefficient had an almost appropriate trend, which improved the performance of the blend membranes compared to pure Pebax 1657. In the membranes containing 50% (by weight) additive, the diffusion and diffusion selectivity decreased due to the change of the dominant phase from polyethylene oxide to vinyl acetate-based copolymers, resulting in the reduction of the permeability. By increasing of the pressure, the permeability of carbon dioxide was increased which can be attributed to the increase in the solubility of carbon dioxide and then to the rubbery and resistance properties of the added copolymers against pressure. Compared to a pure Pebax 1657, gas separation performance of the blend membranes containing 10 and 30% (by weights) of vinyl acetate-based copolymers were closer to Robeson’s curve, confirming the improvement of permeability properties in these membranes.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 6","pages":"799 - 814"},"PeriodicalIF":2.4,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140128377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
L-Lactide ring-opening polymerization: a multi-objective optimization approach through mathematical modeling L-内酰胺开环聚合:通过数学建模的多目标优化方法
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-14 DOI: 10.1007/s13726-024-01291-z
Geetu P. Paul, Virivinti Nagajyothi
{"title":"L-Lactide ring-opening polymerization: a multi-objective optimization approach through mathematical modeling","authors":"Geetu P. Paul,&nbsp;Virivinti Nagajyothi","doi":"10.1007/s13726-024-01291-z","DOIUrl":"10.1007/s13726-024-01291-z","url":null,"abstract":"<div><p>As industries move towards sustainable product development, biopolymers such as polylactide are gaining significant attention owing to their self-degradability and eco-friendliness. Therefore, a multi-objective optimization problem (MOOP) formulation to obtain high-performance polylactide concerning physicochemical properties is designed through mathematical modeling and solved using the Elitist Non-dominated Sorting Genetic Algorithm (NSGA II). The current work is focused on improving the polymer growth mechanisms with stannous octoate (catalyst) and 1-dodecanol (co-catalyst) by analyzing three different case studies using optimization approach. In the first study, the Pareto front for batch <i>L</i>-lactide ring-opening polymerization (L-ROP) with objective functions of average molecular weight, polydispersity index, and time is obtained. Further investigations on esterification, chain propagation and the ratio of monomer–catalyst and cocatalyst–catalyst is carried out. The optimized result using certain range of initial reagent concentrations is determined and one of the suitable Pareto optimal solution for case study 1 gives <i>M</i><sub>w</sub> = 610 kDa, PDI = 1.8, time = 100 s; case study 2 is <i>M</i><sub>w</sub> = 560 kDa, λ1/λ0 = 4300, λ0 = 70; case study 3 is <i>M</i><sub>w</sub> = 500 kDa, <i>M</i>/<i>C</i> = 33,800, ROH/C = 8.5. The neighboring optimal solutions in the Pareto front have been classified into 3 groups and the corresponding process parameters for the particular outcome are tabulated. Process modeling and optimization in close vicinity with appropriate experimental data are distinct aspects of this work to apply in industrial plant level.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 6","pages":"815 - 826"},"PeriodicalIF":2.4,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Constraints on industrial-scale application of lignocellulosic fiber and biomass in food packaging 木质纤维素纤维和生物质在食品包装中工业化应用的制约因素
IF 2.4 3区 化学
Iranian Polymer Journal Pub Date : 2024-03-12 DOI: 10.1007/s13726-024-01288-8
Sanchita Biswas Murmu, Laxmi Kanta Nayak, Ammayappan Lakhmanan, Haokhothang Baite, Dipak Nayak, Boris Huirem
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