Polymer Bulletin最新文献_第4页

The preparation of trimethylolpropane ethoxylate-170-based antibacterial wound dressing materials containing allantoin via electrospinning method 通过电纺丝法制备含尿囊素的三羟甲基丙烷聚氧乙烯醚-170 型抗菌伤口敷料材料

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-10 DOI: 10.1007/s00289-024-05493-6

Ayşe Başak Çakmen, Samir Abbas Ali Noma, Canbolat Gürses, Süleyman Köytepe, Burhan Ateş, İsmet Yilmaz

{"title":"The preparation of trimethylolpropane ethoxylate-170-based antibacterial wound dressing materials containing allantoin via electrospinning method","authors":"Ayşe Başak Çakmen, Samir Abbas Ali Noma, Canbolat Gürses, Süleyman Köytepe, Burhan Ateş, İsmet Yilmaz","doi":"10.1007/s00289-024-05493-6","DOIUrl":"10.1007/s00289-024-05493-6","url":null,"abstract":"<div><p>In this study, multifunctional wound and burn dressing material was developed to cover open wounds and protect them from external effects. Trimethylolpropane ethoxylate-170 (TMPE)-based polyurethane/polycaprolactone (PU/PCL) dressing materials were prepared with high biocompatibility and ordered nanofiber formation. Prepared PU/PCL dressing materials also contain allantoin additive to accelerate wound healing. Polyurethane structures were synthesized using solution polymerization technique from hexamethylene diisocyanate, polyethylene glycol-200, TMPE and Tween-40 monomers in different mole ratios. The obtained polyurethanes and dressing materials were characterized structurally, thermally and morphologically. Then, PCL, allantoin and gentamicin sulfate were added to these PU structures and converted into wound dressing materials by electrospinning technique. The allantoin release, mechanical analysis, antibacterial properties and biodegradability of the produced dressing materials were investigated. The obtained PU/PCL dressing materials were seen as flexible, durable and structural stable. These dressing materials have fiber diameter of approximately 500 nm. The tensile strength and Young's modulus of PU/PCL dressing materials are 2.22 ± 0.39 MPa and 1.04 ± 0.11 MPa. They released allantoin regularly for about 70 h and showed antibacterial properties. In addition, the prepared dressing materials have grade 1 biocompatibility. As a result, these dressing materials provide a good alternative to existing wound dressing materials.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16801 - 16826"},"PeriodicalIF":3.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222300","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

Manipulation of ferroelectric response of PVDF-TRFE free-standing flexible films due to incorporation of BaTiO3 nanoparticle fillers 通过加入 BaTiO3 纳米粒子填料操纵 PVDF-TRFE 独立柔性薄膜的铁电响应

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-10 DOI: 10.1007/s00289-024-05483-8

G. Hassnain Jaffari, Hafsa Shawana, Fiza Mumtaz, M. Shahid Iqbal Khan, Musa Mutlu Can

{"title":"Manipulation of ferroelectric response of PVDF-TRFE free-standing flexible films due to incorporation of BaTiO3 nanoparticle fillers","authors":"G. Hassnain Jaffari, Hafsa Shawana, Fiza Mumtaz, M. Shahid Iqbal Khan, Musa Mutlu Can","doi":"10.1007/s00289-024-05483-8","DOIUrl":"10.1007/s00289-024-05483-8","url":null,"abstract":"<div><p>The main objective of the present work is to get insight into the polarization switching and dielectric response of PVDF-TrFE with incorporation of BaTiO<sub>3</sub> (BTO) nanoparticles. For this purpose, cost-effective solvent casting technique was used, to prepare PVDF-TrFE/BaTiO<sub>3</sub> composite free-standing films. It is necessary to prepare films in which BTO nanoparticles are distributed homogenously without agglomeration. Surface functionalization technique is reported to be useful in homogenous distribution of the nanofiller in polymer matrix. However, addition of surface modifier causes reduction in the permittivity of the polymer nanocomposite and deteriorates the desired properties. Therefore, the main aim of the present work is to obtain homogenous free-standing PVDF-TrFE/BaTiO<sub>3</sub> composite films in which filler is dispersed without any use of surface modifier. Hence ferroelectric particles are dispersed in the ferroelectric polymer matrix. It has been observed that nanocomposite is much more complex compared to the simple models based on spheres dispersed in a medium. Complexities arise due to the strain and interfacial effects of the BTO nanoparticles on the ferroelectric matrix which exhibits marked effect on structural and electrical response of the system. Consequently, specific concentration of filler has been identified at which optimum ferroelectric and dielectric properties of PVDF-TrFE/BaTiO<sub>3</sub> composite have been achieved. Incorporation of more than a desired concentration of filler affects the chain alignment and causes reduction in the β-phase content. Correlation between structural and electrical response has been discussed in detail to explain the non-monotonic trend of polarization as a function of BTO content.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16781 - 16799"},"PeriodicalIF":3.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222319","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

Optimized UV-barrier carboxymethyl cellulose-based edible coatings reinforced with green synthesized ZnO-NPs for food packaging applications 用绿色合成 ZnO-NPs 增强的基于羧甲基纤维素的优化紫外线阻隔食用涂料，用于食品包装应用

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-09 DOI: 10.1007/s00289-024-05462-z

Hend E. Salama, Mohamed S. Abdel Aziz

{"title":"Optimized UV-barrier carboxymethyl cellulose-based edible coatings reinforced with green synthesized ZnO-NPs for food packaging applications","authors":"Hend E. Salama, Mohamed S. Abdel Aziz","doi":"10.1007/s00289-024-05462-z","DOIUrl":"10.1007/s00289-024-05462-z","url":null,"abstract":"<div><p>The widespread use of sodium carboxymethyl cellulose (CMC) in the production of edible coatings is returned to its biodegradable, biocompatible, and non-toxic nature. However, neat CMC edible coatings lack UV-shielding activity and have poor antimicrobial properties. This study aimed to develop a CMC-based coating with optimal UV-barrier properties by incorporating aloe vera (AV) and green synthesized zinc oxide nanoparticles (ZnO-NPs). The composition and synergistic effects of CMC, AV, and ZnO-NPs were optimized using central composite design to achieve the best UV-barrier properties. When using the optimized compositions of CMC (1.0 g), AV (3.0 g), and ZnO-NPs (5.0 wt%), the minimum UV-transmittance achieved was 4.75%. Fourier transform infra-red and wide-angle X-ray diffraction were used to confirm the interactions between the coating components. The incorporation of ZnO-NPs into CMC/AV was validated through surface morphology analysis via scanning electron microscopy and by examining the distribution of ZnO-NPs using transmission electron microscopy. CMC/AV/ZnO-NPs coatings showed excellent water barrier, mechanical, thermal, and antimicrobial properties when compared with the neat carboxymethyl cellulose coating. In addition, CMC/AV/ZnO-NPs coatings significantly resisted both mass loss and spoilage of green capsicum for a 15-day storage period. These results proved that the optimized coating could replace the plastic packaging candidates and be used potentially to preserve food products.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16733 - 16755"},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00289-024-05462-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Poly (ε‐caprolactone)/polybutylene adipate terephthalate/hydroxyapatite blend bionanocomposites: morphology–thermal degradation kinetics relationship 聚（ε-己内酯）/聚己二酸丁二醇酯/羟基磷灰石共混仿生复合材料：形态-热降解动力学关系

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-09 DOI: 10.1007/s00289-024-05481-w

Amirali Bolourian, Samaneh Salkhi Khasraghi, Sara Zarei, Shahla Mahdavi, Hanieh Khonakdar, Seyed Rasoul Mousavi, Hossein Ali Khonakdar

{"title":"Poly (ε‐caprolactone)/polybutylene adipate terephthalate/hydroxyapatite blend bionanocomposites: morphology–thermal degradation kinetics relationship","authors":"Amirali Bolourian, Samaneh Salkhi Khasraghi, Sara Zarei, Shahla Mahdavi, Hanieh Khonakdar, Seyed Rasoul Mousavi, Hossein Ali Khonakdar","doi":"10.1007/s00289-024-05481-w","DOIUrl":"10.1007/s00289-024-05481-w","url":null,"abstract":"<div><p>Polycaprolactone/polybutylene adipate terephthalate blends (PCL/PBAT) (90/10, 75/25, and 50/50 wt/wt) containing 1, 3, and 5 phr hydroxyapatite (HA) nanoparticles were prepared using solvent-casting technique. Scanning electron microscopic studies confirmed a homogeneous morphology for the blends and nanocomposites. Some agglomeration can be recognized using energy-dispersive spectroscopy mapping in the blends containing 5 phr HA. The DSC results confirmed the presence of nanoparticles in each phase, particularly in the crystalline region, and wetting coefficient confirmed the localization of nanoparticles at the interface. Thermal stability and degradation kinetics were analyzed using thermogravimetric analysis (TGA). Based on the TGA results, a multi-step degradation process resulted in the blends and blend nanocomposites and the PCL/PBAT blends showed better thermal stability and exhibited higher <i>T</i><sub><i>max</i></sub> and residual mass. PCL/PBAT blends were more stable at higher temperatures compared to PCL and PBAT. Various kinetics evaluation techniques, including Friedman, Flynn–Ozawa–Wall, and Kissinger–Akahira–Sunose methods, were utilized to determine the activation energy of degradation. PCL/PBAT blends were more difficult to thermally degrade and showed the highest degradation activation energy. Incorporating HA led to lower thermal stability and, therefore, lower degradation activation energy. Incorporation of only 5 phr of HA resulted in greater thermal stability at higher temperatures (<i>T</i><sub>90%</sub>).</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16757 - 16780"},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222321","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

Jute nanofibers as modifiers in waste polypropylene/polystyrene/natural rubber (wPP/PS/NR) ter-blends 黄麻纳米纤维作为废聚丙烯/聚苯乙烯/天然橡胶（wPP/PS/NR）三元共混物的改性剂

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-07 DOI: 10.1007/s00289-024-05480-x

Yusuf Adamu, Tajudeen Kolawole Bello, Umar Shehu, Abdullahi Bello, Gazali Tanimu, Muhammed Tijani Isa

{"title":"Jute nanofibers as modifiers in waste polypropylene/polystyrene/natural rubber (wPP/PS/NR) ter-blends","authors":"Yusuf Adamu, Tajudeen Kolawole Bello, Umar Shehu, Abdullahi Bello, Gazali Tanimu, Muhammed Tijani Isa","doi":"10.1007/s00289-024-05480-x","DOIUrl":"10.1007/s00289-024-05480-x","url":null,"abstract":"<div><p>The study explores the novel use of jute nanofibers as environmentally friendly modifiers to enhance the mechanical and thermal properties of waste polypropylene/polystyrene/natural rubber (wPP/PS/NR) ter-blends. It aligns with the sustainable development goal (MDG 7) to ensure environmental sustainability. Nanofiber was produced from jute fiber via a ball milling process after freezing with liquid nitrogen. The produced nanofibers were analyzed using Fourier transform infrared (FTIR) spectroscopy and dynamic light scattering (DLS). Ter-blend, produced via melt blending using two-roll mills, was modified with the nanofibers at different weight percentages (2–10 wt%) at 2 wt% intervals. The modified polymer blends were characterized by their mechanical, thermal, physical, and morphological properties. FTIR revealed the removal of hemicellulose, lignin, and other impurities from the jute fiber due to chemical treatment. DLS analysis revealed an average size distribution of 85.54 nm, for which an intensity and polydispersity index (PDI) of 0.353 was achieved. Additionally, thermogravimetric analysis (TGA) confirmed that the jute nanofibers were thermally stable up to 282 °C. The polymer blends modified with 2 wt% nanofibers had the highest average impact and tensile strength. The percentage water absorption (%WA) showed that sp10% absorbed the highest amount of water after 24 h. The weight loss of the modified blend at various temperatures increased with the addition of nanofibers. Scanning electron microscopy (SEM) revealed cracks, voids, and blend separation as the amount of jute nanofibers increased. Dynamic mechanical analysis (DMA) revealed that the <i>T</i><sub>g</sub> of the modified blend improved, while the loss factor improved greatly by 43%, but the storage and loss moduli remained unchanged.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16707 - 16732"},"PeriodicalIF":3.1,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222317","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

Hyaluronic acid-PVA loaded with Ag3(PO4)/Sm2O3/CNT by film casting technique: morphology, mechanical, thermal stability, swelling, antibacterial, and cell viability 利用铸膜技术在透明质酸-PVA 中添加 Ag3(PO4)/Sm2O3/CNT ：形态、机械、热稳定性、溶胀、抗菌和细胞活力

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-06 DOI: 10.1007/s00289-024-05461-0

Lamiaa G. Alharbe, Aysh Y. Madkhli

{"title":"Hyaluronic acid-PVA loaded with Ag3(PO4)/Sm2O3/CNT by film casting technique: morphology, mechanical, thermal stability, swelling, antibacterial, and cell viability","authors":"Lamiaa G. Alharbe, Aysh Y. Madkhli","doi":"10.1007/s00289-024-05461-0","DOIUrl":"10.1007/s00289-024-05461-0","url":null,"abstract":"<div><p>The healing of wounds is still a difficult clinical issue, and effective wound management is necessary to promote wound healing. Fabrication of highly developed dressings for wounds exhibiting biologically active properties and possessing favorable mechanical characteristics to accelerate the period of healing to avoid sideways bacterial infection. Hyaluronic acid (HA) inserted with loaded metal oxides such as silver phosphate (Ag<sub>3</sub>(PO<sub>4</sub>)), CNT and samarium oxide (Sm<sub>2</sub>O<sub>3</sub>) by film casting technique. The prepared films were examined by XRD, SEM, FTIR, and TGA. The surface topography showed a rough surface with low porosity for pure HA, while the addition of nanoparticles caused an incredible increase in the roughness with pores in diameter of 4–15 µm. The smooth surface appeared due to the addition of carbon nanotubes (CNT) and the mixing of the HA with polyvinyl alcohol (PVA). The contact angle was determined with water drops to determine the wettability of the prepared films, and it showed different changes varying between 67.72° for pure HA and then increased to 73.33° with the addition of Ag<sub>3</sub>(PO<sub>4</sub>), while the addition of Sm<sub>2</sub>O<sub>3</sub> reduced the angle to 54.76° and 46.59° with mixing the ratios of nanoparticles. On the other hand, the Ag<sub>3</sub>(PO<sub>4</sub>)/Sm<sub>2</sub>O<sub>3</sub>/CNT@PVA/HA film represented a slight increase in the angle to 53.77° which has a hydrophilic tendency. The antibacterial test was done, and it was shown that the inhibition zone reached 20.5 ± 1.5 and 17.5 ± 1.5 against <i>E. coli</i> and <i>S. aureus</i>, respectively, for Ag<sub>3</sub>(PO<sub>4</sub>)@HA. The generated data display that the biological behavior of the mentioned nanocomposites (NCs) is promising.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16683 - 16706"},"PeriodicalIF":3.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222326","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

Mechanically tunable fluorescence emission and patterned image of a conjugated polymer with an intramolecular stacking structure in an elastomeric silicone rubber matrix 在弹性硅橡胶基体中具有分子内堆积结构的共轭聚合物的机械可调荧光发射和图案图像

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-06 DOI: 10.1007/s00289-024-05482-9

Dong Cheul Han, Heesang Kim, Chang-Lyoul Lee, Giseop Kwak

引用次数: 0

Facile synthesis of interpenetrating polymeric nexus for controlled drug delivery of 5-fluorouracil (5-FU) 用于控制 5-氟尿嘧啶 (5-FU) 给药的互穿聚合物结合物的简便合成

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-06 DOI: 10.1007/s00289-024-05477-6

Maria Malook, Asif Mahmood, Hira Ijaz, Rai Muhammad Sarfraz, Muhammad Rauf Akram, Bilal Haroon, Zulcaif Ahmad, Sadaf Ayub, Faisal Gulzar

{"title":"Facile synthesis of interpenetrating polymeric nexus for controlled drug delivery of 5-fluorouracil (5-FU)","authors":"Maria Malook, Asif Mahmood, Hira Ijaz, Rai Muhammad Sarfraz, Muhammad Rauf Akram, Bilal Haroon, Zulcaif Ahmad, Sadaf Ayub, Faisal Gulzar","doi":"10.1007/s00289-024-05477-6","DOIUrl":"10.1007/s00289-024-05477-6","url":null,"abstract":"<div><p>The purpose of the current research study was to formulate and evaluate a fenugreek (FG) and agarose (AG) base hydrogel exploiting pH-responsive attributes and colon targeting of 5-fluorouracil (5-FU). A novel 5-FU loaded fenugreek (FG) and agarose (AG) base hydrogel was formulated via free radical polymerization by employing N’, N’methylene bisacrylamide (MBA) as a crosslinker and methacrylic acid as a monomer. The influence of substrate concentrations (FG, AG, MBA, and MAA) was studied on the swelling index, sol–gel fraction, and drug release rate (%). It was also evaluated that as the concentration of fenugreek and agarose increases, drug release increases to 94.35 ± 0.34 (%) at pH 7.4 and 13.34 ± 0.34 (%) at pH 1.2. However, an increase in MAA concentration further leads to an increase in swelling, 95.87 ± 0.23 at pH 7.4 and 14.35 ± 0.74 at pH 1.2. Moreover, MBA concentration could significantly and directly influence the swelling of hydrogels owing to the variation of crosslinking density. An increase in MBA concentration results in a significant decrease in swelling. Fourier transform infrared spectroscopy (FTIR) depicted the grafting of polymers (FG and AG) and monomers (MAA). Thermal behavior showed that the formulated nexus protects the drug and substrate from degradation. The X-ray diffraction analysis (XRD) revealed that the entrapment of the drug within the nexus mimicked its crystalline behavior. The scanning electron microscope (SEM) elucidates the porous, rough, irregular, and asymmetric nature of the nexus. Toxicity studies showed that the best-selected optimized formulated nexus (F9) is biocompatible, non-toxic, and promising for targeted delivery of 5-FU for curing colorectal cancer.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16635 - 16669"},"PeriodicalIF":3.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222324","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 concentrated solar radiation on the accelerated degradation of poly(ethylene terephthalate) using a compound parabolic concentrator (CPC) 使用复合抛物面聚光器（CPC）的聚光太阳辐射对聚对苯二甲酸乙二醇酯加速降解的影响

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-05 DOI: 10.1007/s00289-024-05484-7

Lol-chen Alegría Mejía, Miriam Sánchez Pozos, Noel León Albiter, María D. Baeza Alvarado, Luis E. Lugo Uribe

{"title":"Effect of concentrated solar radiation on the accelerated degradation of poly(ethylene terephthalate) using a compound parabolic concentrator (CPC)","authors":"Lol-chen Alegría Mejía, Miriam Sánchez Pozos, Noel León Albiter, María D. Baeza Alvarado, Luis E. Lugo Uribe","doi":"10.1007/s00289-024-05484-7","DOIUrl":"10.1007/s00289-024-05484-7","url":null,"abstract":"<div><p>The effects of concentrated solar radiation on the thermal, chemical, and mechanical properties of post-consumer poly(ethylene terephthalate) (PET) films are studied in the present research work. The films were exposed to solar radiation using a compound parabolic concentrator (CPC), and the results are compared with those obtained from exposing PET films to conditions established in an accelerated weathering chamber (QUV). The CPC and QUV were evaluated on specimens measuring 2 × 13 × 0.5 cm<sup>3</sup>. Exposure in the CPC was carried out over one year during the periods of February–April, May–July, and October–December. Additionally, in the QUV, the equivalence in hours of exposure to that used in the CPC was sought. The results obtained by differential scanning calorimetry (DSC) indicate a significant increase in crystallinity in the material exposed within CPC, while specimens in QUV exhibited effects related to physical aging. Information obtained from thermogravimetric analysis (TGA) showed a decrease in thermal stability and maximum degradation temperature of the exposed specimens, with a trend consistent with DSC. Intensity decreased in the infrared spectra of films exposed in the CPC, without absorption bands of photo- or thermodegradation. The intrinsic viscosity of specimens exposed to degradation showed a maximum reduction of 17%, attributed to polymeric chain cleavage due to photodegradation. The dynamic mechanical analysis (DMA) evidenced a deterioration in the elastic response of the material, particularly in the one subjected to solar concentration, which is aligned with the surface cracking observed by scanning electron microscopy.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16575 - 16594"},"PeriodicalIF":3.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222325","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

Comparison of thermal insulation performance of foam extruded black EPS 泡沫挤压黑色发泡聚苯乙烯的隔热性能比较

IF 3.1 3区化学

Polymer Bulletin Pub Date : 2024-09-05 DOI: 10.1007/s00289-024-05485-6

E. Erünal

{"title":"Comparison of thermal insulation performance of foam extruded black EPS","authors":"E. Erünal","doi":"10.1007/s00289-024-05485-6","DOIUrl":"10.1007/s00289-024-05485-6","url":null,"abstract":"<div><p>Thermal resistance of expanded polystyrene (EPS) insulation boards are investigated in terms of foam extrusion process equipped with an underwater pelletizer. This method has been used by several companies as an alternative process to obtain EPS beads from suspension polymerization of styrene. In this process either polystyrene granules with no cellular microstructure (general purpose polystyrene) or polystyrene beads with closed cell structure or both together can be used. Therefore, in this study, commercial general purpose polystyrene and expandable polystyrene materials were blended with either carbon black or graphite powder through foam extrusion process to obtain effective thermal resistance values. In order to make a fair comparison, materials were prepared similar to commercial recipes which include flame retardant and nucleating agent. It was observed that the compatibility of graphite powder with general purpose polystyrene was better than expandable polystyrene in terms of glass transition temperatures and thermal insulation values. The density of the prepared materials increased with the addition of carbon black to all samples. The best glass transition temperature was measured as 107.5 °C while the best thermal conductivity value was recorded as 0.2997 W/m.K which is fairly good when compared to commercial polystyrene insulation boards.</p></div>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":"81 18","pages":"16595 - 16605"},"PeriodicalIF":3.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222322","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