e-Polymers最新文献_第4页

Comparative analysis of flow factors and crystallinity in conventional extrusion and gas-assisted extrusion 传统挤压和气体辅助挤压中流动因子和结晶度的比较分析

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-21 DOI: 10.1515/epoly-2023-0076

Xuemei Huang, Hesheng Liu, Xingyuan Huang, Yibin Huang, Zhong Yu

{"title":"Comparative analysis of flow factors and crystallinity in conventional extrusion and gas-assisted extrusion","authors":"Xuemei Huang, Hesheng Liu, Xingyuan Huang, Yibin Huang, Zhong Yu","doi":"10.1515/epoly-2023-0076","DOIUrl":"https://doi.org/10.1515/epoly-2023-0076","url":null,"abstract":"Two-dimensional models of die-melt and die-gas-melt were created using Polyflow software. The radial and axial directions flow rate, shear rate, pressure, and first normal stress of the specimen were numerically simulated under conventional extrusion and gas-assisted extrusion while taking into consideration the heat transfer on the free surface of the specimen. The crystallinity was determined by combining the simulation data with the crystallization kinetics equation. The computation results are then examined using Origin software. The findings demonstrate that the use of gas-assisted extrusion technology can cause the Vx to decrease or even turn negative by reducing the friction between the melting edge and the die wall. Additionally, it makes Vy , pressure, shear rate, temperature, first normal stress, and crystallinity increasingly steady and aids in reducing or avoiding the Barus effect. The crystallization phenomena can be measured by using the crystallization kinetics equation. The study of extruded parts at the microscopic level will benefit from this application.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"37 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202306","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

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-21 DOI: 10.1515/epoly-2024-0009

Yong Wang, Zihan Yuan, Mingkun Qi, Lizheng Zhang, Mingwei Li, Wei Wang, Changlong Li

{"title":"Twist-related parametric optimization of Joule heating-triggered highly stretchable thermochromic wrapped yarns using technique for order preference by similarity to ideal solution","authors":"Yong Wang, Zihan Yuan, Mingkun Qi, Lizheng Zhang, Mingwei Li, Wei Wang, Changlong Li","doi":"10.1515/epoly-2024-0009","DOIUrl":"https://doi.org/10.1515/epoly-2024-0009","url":null,"abstract":"A scalable approach for manufacturing highly stretchable thermochromic wrapped yarns has been reported previously. Herein, the effects of twist-related technological parameters, namely, wrapping density and outer-inner twist ratio are investigated and have been optimized by technique for order preference by similarity to ideal solution (TOPSIS). The results indicate that the preparatory twist-related parameters have a remarkable effect on the spiral geometrical configuration of yarn constituents, and thus in turn influencing the final tensile and elastic properties of wrapped yarns. The wrapping density of 800 T·m−1 and outer-inner twist ratio of 1.25 were considered as the optimal alternative using TOPSIS. Moreover, a negative relation between voltage and color-changing time of yarn spun with optimal parameters was established. It was also found that the color of yarn above elevated triggered voltages always switched from purple to pink but followed different color-changing paths. More importantly, thermochromic response of yarn is insensitive to the applied strain.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"20 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202397","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

Synthesis, characterization and evaluation of a pH-responsive molecular imprinted polymer for Matrine as an intelligent drug delivery system 一种 pH 值响应型分子印迹聚合物的合成、表征和评估，用于将 Matrine 用作智能给药系统

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-20 DOI: 10.1515/epoly-2023-0184

Yanhui Ge, Liuyang Ding, Yubo Liu, Xiong Li

{"title":"Synthesis, characterization and evaluation of a pH-responsive molecular imprinted polymer for Matrine as an intelligent drug delivery system","authors":"Yanhui Ge, Liuyang Ding, Yubo Liu, Xiong Li","doi":"10.1515/epoly-2023-0184","DOIUrl":"https://doi.org/10.1515/epoly-2023-0184","url":null,"abstract":"To address the undesirable reactions associated with matrine (MAT) injection in clinical settings, a high-loading drug delivery system (DDS) based on pH-sensitive molecularly imprinted polymer (MAT@MIPs) was prepared for the first time. The imprinted materials containing recognition sites for the matrine were formed by using carboxyl-functionalized multiwalled carbon nanotubes as a supportive matrix and dopamine as a cross-linker due to its exceptional biocompatibility. Subsequently, the optimal reaction conditions and adsorption performance of MAT@MIPs were systematically investigated. The obtained polymers were characterized and evaluated by Fourier transform infrared spectrometry, scanning electron microscopy, elemental analysis, and thermogravimetric analysis. Results indicated that the MIPs demonstrated a favorable imprinting factor (2.36) and a high binding capacity (21.48 mg·g−1) for matrine. In vitro studies, we performed cell counting kit-8 assays in HepG2 cells, then the drug delivery capabilities of MAT-loaded MIPs were validated through light microscopy analyses, and the matrine content in culture medium was quantified using ultra high-performance liquid chromatography-mass spectrum synchronously. The facile fabrication of MAT@MIPs presents a viable solution for designing high-loading and pH-responsive DDS, which can offer a novel administration approach for drugs requiring injection in clinical applications.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"20 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202301","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

Experimental evaluation on compression-after-impact behavior of perforated sandwich panel comprised of foam core and glass fiber reinforced epoxy hybrid facesheets 泡沫芯材和玻璃纤维增强环氧树脂混合面材组成的穿孔夹芯板压缩冲击后行为的实验评估

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-19 DOI: 10.1515/epoly-2024-0021

Yilin Tu, Xu Li, Hongyuan Huang, Chen Chen, Gang Liu, Youping Liu, Ye Wu

{"title":"Experimental evaluation on compression-after-impact behavior of perforated sandwich panel comprised of foam core and glass fiber reinforced epoxy hybrid facesheets","authors":"Yilin Tu, Xu Li, Hongyuan Huang, Chen Chen, Gang Liu, Youping Liu, Ye Wu","doi":"10.1515/epoly-2024-0021","DOIUrl":"https://doi.org/10.1515/epoly-2024-0021","url":null,"abstract":"To study the impact response and compression-after-impact (CAI) behavior of perforated sandwich panels comprised of foam core and glass fiber-reinforced epoxy hybrid facesheets, the hole diameter of specimens is changed in the fabrication via vacuum-assisted resin infusion. Furthermore, low-velocity-impact tests with various impact distances between the impact point and hole are carried out. With the help of the digital image correlation technique, CAI testing is conducted, and the strain evolution of specimens is monitored carefully. The mechanical response history, damage morphology, and compressive process are discussed in detail. The results show that the impact and CAI performance of specimens are weakened because of open holes. Compared with the non-perforated specimen, the maximum force of the specimen with a 6-mm hole and the 5-mm impact distance decreases by 41.21%, and its maximum displacement increases by 38.60%. During the CAI process, in comparison with the impact damage, more significant stress concentration and buckling around the hole are found.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"31 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140167970","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

Recent advancements in multinuclear early transition metal catalysts for olefin polymerization through cooperative effects 通过合作效应实现烯烃聚合的多核早期过渡金属催化剂的最新进展

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-19 DOI: 10.1515/epoly-2023-0195

Qiang Yue, Rong Gao, Zhihui Song, Jingjing Lai, Randi Zhang, Ying Wang, Qingqiang Gou

{"title":"Recent advancements in multinuclear early transition metal catalysts for olefin polymerization through cooperative effects","authors":"Qiang Yue, Rong Gao, Zhihui Song, Jingjing Lai, Randi Zhang, Ying Wang, Qingqiang Gou","doi":"10.1515/epoly-2023-0195","DOIUrl":"https://doi.org/10.1515/epoly-2023-0195","url":null,"abstract":"The pursuit of high-performance polyolefin materials has been an objective for chemists. Recently, the development of multinuclear catalysts has significantly enabled the preparation of high-performance polyolefin materials. In this review, we mainly focus on the cooperative effects of multinuclear early transition metal catalysts and provide a comprehensive summary of the research progress in binuclear and multinuclear early transition metal catalysts over the past decade. Compared with the catalytic performance and polymer structure of these catalysts with mononuclear catalysts, we have found that various factors, such as steric hindrance effect, electronic effect, heteroatom effect, hydrogen bonding interaction, the distance between metal centers in multinuclear metal catalysts, and the use of additives, have distinctive and significant impacts on catalyst performance. These effects give rise to notable cooperative effects. This review offers crucial insights and serves as a valuable reference for shaping the future development directions of binuclear and multinuclear early transition metal catalysts.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"40 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140167972","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

The effects of property variation on the dripping behaviour of polymers during UL94 test simulated by particle finite element method 粒子有限元法模拟的 UL94 试验中聚合物滴落行为的性质变化影响

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-19 DOI: 10.1515/epoly-2023-0194

Analice Turski Silva Diniz, Bernhard Schartel

{"title":"The effects of property variation on the dripping behaviour of polymers during UL94 test simulated by particle finite element method","authors":"Analice Turski Silva Diniz, Bernhard Schartel","doi":"10.1515/epoly-2023-0194","DOIUrl":"https://doi.org/10.1515/epoly-2023-0194","url":null,"abstract":"The dripping behaviour of polymers is often observed experimentally through the UL94 flammability standard test. In this work, polymeric dripping under fire is investigated numerically using particle finite element method. A parametric analysis was carried out to observe the influence of a single property on overall dripping behaviour via a UL94 vertical test model. Surrogates and property ranges were defined for variation of the following parameters: glass transition temperature (T g), melting temperature (T m), decomposition temperature (T d), density (ρ), specific heat capacity (Cp), apparent effective heat of combustion of the volatiles, char yield (µ), thermal conductivity (k), and viscosity (η). Polyamide, poly(ether ether ketone), poly(methyl methacrylate), and polysulfone were used as benchmarks. Simulated results showed that specific heat capacity, thermal conductivity, and char yield allied with viscosity were the properties that most influenced dripping behaviour (starting time and occurrence).","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"2014 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140167971","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

Rheological behavior of particle-filled polymer suspensions and its influence on surface structure of the coated electrodes 颗粒填充聚合物悬浮液的流变行为及其对涂层电极表面结构的影响

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-18 DOI: 10.1515/epoly-2023-0133

Hao Ming, Yinyan Guan, Cong Geng, Yingjun Gao, Jing Meng, Jiyan Liang

{"title":"Rheological behavior of particle-filled polymer suspensions and its influence on surface structure of the coated electrodes","authors":"Hao Ming, Yinyan Guan, Cong Geng, Yingjun Gao, Jing Meng, Jiyan Liang","doi":"10.1515/epoly-2023-0133","DOIUrl":"https://doi.org/10.1515/epoly-2023-0133","url":null,"abstract":"Capacitive deionization electrode prepared by coating was commonly investigated, with polymer solution as binder and active particles as adsorbent. In the coating process, microstructure constituted by the two components was damaged by shear, then rebuilt when shear was removed. The microstructure strongly influenced the surface structure of the coated electrodes, further to performance and cycle life. The discussion of the interaction between the components in the coating process facilitates the identification of structural mechanisms. Rheology bridged the flow regimes in macroscale and interaction in microscale, through which the interaction between the polymer and particles can be investigated in a macroscopic phenomenon. In this study, hydrophilic polymer, poly(vinyl alcohol) (PVA), and poly(ethylene oxide) (PEO) were used as binders to prepare the suspension for coating. The influence of polymer molecular structure to interaction and microstructure was investigated by rheology. Results showed that the flexibility of polymer determined the adsorption morphology, leading to different flocculation structures. For rigid PVA, a 3d-crosslinked network was formed, giving a tough coating. While for flexible PEO, encapsulation structure was formed, leading to a brittle coating. A model based on bridging flocculation was evaluated to describe the formation and destruction of the flocculation structure. And a rheological method for binder selection and coating operation was proposed.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"34 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140168088","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

Determination of pesticide residue in soil samples by molecularly imprinted solid-phase extraction method 分子印迹固相萃取法测定土壤样品中的农药残留量

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-16 DOI: 10.1515/epoly-2023-0174

Xiaofeng Yu, Jiawei Xie, Bixing Yan, Renyuan Song, Kun Chen, Hegang Yan

{"title":"Determination of pesticide residue in soil samples by molecularly imprinted solid-phase extraction method","authors":"Xiaofeng Yu, Jiawei Xie, Bixing Yan, Renyuan Song, Kun Chen, Hegang Yan","doi":"10.1515/epoly-2023-0174","DOIUrl":"https://doi.org/10.1515/epoly-2023-0174","url":null,"abstract":"Porous molecularly imprinted polymer (MIP) microspheres were synthesized via iniferter-suspension polymerization method, employing lenacil (LA) as the template molecule and methacrylic acid (MAA) as the functional monomer. The host–guest complexes formed using LA and MAA were characterized by hydrogen nuclear magnetic resonance and ultraviolet–visible absorption spectroscopy. The obtained results showed that the interaction between LA and MAA mainly relied on hydrogen bonding. The surface morphologies and chemical structures of the MIPs were characterized by scanning electron microscopy. MIPs were spherical in shape with a relatively regular sphericity, rough surface structure, and numerous small holes, which significantly reduced the mass transfer resistance of the template molecules and exhibited excellent recognition performance for template molecules. In addition, soil samples were pretreated with solid-phase extraction columns molecularly imprinted with LA, and analyzed by high-performance liquid chromatography. The recoveries of LA, bromacil, and terbacil were up to 89.65%, 53.17%, and 44.63%, respectively. The developed method showed a minimum detection limit of 10–50 µg·mL−1. In view of the continuous increase of public requirements for pesticide residue detection, a versatile pretreatment method was developed that is green, rapid, simple, and can be miniaturized.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"16 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140149745","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

The die swell eliminating mechanism of hot air assisted 3D printing of GF/PP and its influence on the product performance 热风辅助三维打印 GF/PP 的模具膨胀消除机理及其对产品性能的影响

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-16 DOI: 10.1515/epoly-2024-0008

Ru Yang, Jianhua Xiao, YingLan Liu, ShiKang Xu

引用次数: 0

Preparation and application of profiled luminescent polyester fiber with reversible photochromism materials 具有可逆光致变色材料的异型发光聚酯纤维的制备与应用

IF 3.7 3区化学

e-Polymers Pub Date : 2024-03-15 DOI: 10.1515/epoly-2023-0121

Yaoding Tao, Shouyun Zhang, Mei Xu, Qiang Shu, Shang Gao, Yanan Liu, Peisong Wang, Ruijia Cheng

{"title":"Preparation and application of profiled luminescent polyester fiber with reversible photochromism materials","authors":"Yaoding Tao, Shouyun Zhang, Mei Xu, Qiang Shu, Shang Gao, Yanan Liu, Peisong Wang, Ruijia Cheng","doi":"10.1515/epoly-2023-0121","DOIUrl":"https://doi.org/10.1515/epoly-2023-0121","url":null,"abstract":"In this study, we realized a highly luminescent polyester fiber using a special spinneret orifice comprised of eight C-shaped pores and specific process parameters. A moderate amount of reversible photochromism materials was added along with the specific color masterbatch of suitable materials. With its high light transmittance and reflectance, the fabric has high glossiness and excellent transparency and exhibits dazzling color effects with changes in ambient light intensity. The raw materials used are polyethylene terephthalate (PET) chips with a low melting point of 110–150°C, 0.3–0.5% (active ingredient 30%) masterbatch, and 40–50% (active ingredient 50%) reversible photochromism masterbatch. The following process parameters were also chosen: for the PET chips, the drying temperature was 80–90°C, the drying time was 12–14 h, the masterbatch drying temperature was 70–80°C, the drying time was 8–10 h, the spinning temperature was 220–230°C, the cooling air temperature was 15–17°C, the cooling air speed was 0.45–0.50 m·min−1, the first hot roller temperature was 75–80°C, and the secondary hot roller had the heater turned off.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"44 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140149519","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