Polymer Science, Series A最新文献_第4页

Preparation and Characterization of PLLA-Based Microporous Membranes with High CO2/O2 Selective Permeability for Food Packaging 用于食品包装的具有高二氧化碳/氧气选择透过性的聚乳酸基微孔膜的制备与表征

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X23600424

Linze Liu, Yang Yang, Tungalag Dong, Lijun Song, Xueyan Yun

{"title":"Preparation and Characterization of PLLA-Based Microporous Membranes with High CO2/O2 Selective Permeability for Food Packaging","authors":"Linze Liu, Yang Yang, Tungalag Dong, Lijun Song, Xueyan Yun","doi":"10.1134/S0965545X23600424","DOIUrl":"10.1134/S0965545X23600424","url":null,"abstract":"To maintain CO2/O2 permselectivity of poly(lactic acid) (PLLA) microporous films for better preservation of fresh produce, Polytrifluoropropylmethylsiloxane (PTFPMS) was introduced into PLLA to prepare PLLA-PTFPMS-PLLA (PLTL) block copolymer. And PLTL-n% microporous films were prepared using varying ratios of chloroform/acetone blended solvents as the film-casting solution in this study. PTFPMS filled a portion of the micropores of the PLTL-n% film. While the micropores enhanced the O2 and CO2 dioxide permeability of the PLLA microporous film, PTFPMS maintained the CO2/O2 selective permeability of the film. In comparison to PLLA films, the CO2 permeability of mixed solvents-treated PLTL-20% film increased from 1.99 × 10–8 to 10.08 × 10–8 cm3 m/m2 h Pa, O2 permeability increased from 0.70 × 10–8 to 2.02 × 10–8 cm3 m/m2 h Pa, and CO2/O2 permselectivity increased from 2.9 to 5.0 at 5°C. In addition, PLTL-n% microporous films also have good flexibility and UV shielding properties.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 1","pages":"136 - 147"},"PeriodicalIF":1.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Copolyaramide As a Barrier Material 作为阻隔材料的共聚酰胺

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600364

A. Yu. Alentiev, R. Yu. Nikiforov, V. P. Shantarovich, N. A. Belov, T. K. Musina, I. V. Stroeva, S. I. Banduryan, N. G. Shishkina

{"title":"Copolyaramide As a Barrier Material","authors":"A. Yu. Alentiev, R. Yu. Nikiforov, V. P. Shantarovich, N. A. Belov, T. K. Musina, I. V. Stroeva, S. I. Banduryan, N. G. Shishkina","doi":"10.1134/S0965545X24600364","DOIUrl":"10.1134/S0965545X24600364","url":null,"abstract":"The films of heterocyclic copolyaramide used at NPO OOO “LIRSOT” for the production of high-strength polyaramide threads are obtained, their gas transport characteristics for helium, oxygen, and carbon dioxide are studied, and the parameters of free volume elements are investigated by positron annihilation lifetime spectroscopy. According to the data obtained, the copolyaramide under study belongs to the class of polymers with high barrier characteristics and its properties are close to those of the commercial samples of thermotropic liquid-crystalline copolyesters Vectra. The low values of gas permeability of copolyaramide are related to decreased gas diffusion coefficients. A comparison of the activation energies of permeability, diffusion, and sorption enthalpy of gases shows that these parameters are also comparable to those of barrier polymers. The gas permeability data are confirmed by positron annihilation lifetime spectroscopy: the sizes of free volume elements obtained for copolyaramide (R3 = 2.5 Å) are also comparable with those for copolyester Vectra (R3 = 2.1 Å). The results of this study demonstrate that the tested domestic heterocyclic copolyaramide can be used for the manufacture of barrier films and coatings as a substitute for Vectra liquid-crystalline copolyesters.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 1","pages":"69 - 75"},"PeriodicalIF":1.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Preparation of Dual-Network Conductive Hydrogels As Wearable Flexible Strain Sensors Using One-Pot Method and Soaking Strategy 采用一锅法和浸泡策略制备作为可穿戴柔性应变传感器的双网络导电水凝胶

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600376

Lingling Meng, Da Liu, Shijie Ding, Weihao Li, En Liu

{"title":"Preparation of Dual-Network Conductive Hydrogels As Wearable Flexible Strain Sensors Using One-Pot Method and Soaking Strategy","authors":"Lingling Meng, Da Liu, Shijie Ding, Weihao Li, En Liu","doi":"10.1134/S0965545X24600376","DOIUrl":"10.1134/S0965545X24600376","url":null,"abstract":"Conductive hydrogel-based flexible strain sensors have gradually attracted the attention of scientific researchers in recent years. They are capable of converting invisible mechanical stimulus signals into visible electrical signals and have excellent biocompatibility and good electrical conductivity, which also provide the basis for the development of flexible electronic devices. Nowadays, conductive hydrogel, as the core component of flexible sensors, puts forward higher requirements for sensitivity, fast response, and cycle stability to adapt to human activity detection and health monitoring. In this paper, acrylamide (AM), cellulose nanocrystals (CNC), and sodium alginate (SA) were used as raw materials to prepare PAM/CNC/SA double network hydrogel by in situ free radical polymerization. Soaked in the CaCl2 solution, a PAM/CNC/SA-Ca2+ double-network conductive hydrogel is formed. The results show that the addition of CNC can significantly improve the mechanical properties of the hydrogel. In addition, the introduction of the Ca2+ ion has a certain positive effect on the conductivity of the hydrogel. At the same time, the conductive hydrogel has good strain sensitivity (gauge factor up to 16.63). Therefore, conductive hydrogels have potential application value and broad application prospects in the field of flexible sensors.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 1","pages":"76 - 85"},"PeriodicalIF":1.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Comparative Study of the Mechanical and Rheological Properties of LDPE Composites with Various Nanocarbon Fillers 含有各种纳米碳填料的低密度聚乙烯复合材料的机械和流变特性对比研究

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600261

M. M. Gasymov, T. I. Medintseva, S. Z. Rogovina, O. P. Kuznetsova, A. V. Shapagin, A. A. Berlin

引用次数: 0

Behavior of Spin Probe TEMPO in Composites Based on Polypropylene with Different Content of Single-Wall Carbon Nanotubes 不同单壁碳纳米管含量的聚丙烯复合材料中旋转探针 TEMPO 的行为

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600418

T. S. Yankova, N. A. Chumakova, P. M. Nedorezova, O. M. Palaznik, A. I. Kokorin

引用次数: 0

New PBI Membranes Doped with Methyl-Imidazolium Triflate Protic Ionic Liquid 掺杂甲基咪唑三氟丙烯酸原离子液体的新型 PBI 膜

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600339

Y. A. Fadeeva, S. M. Kuzmin, L. E. Shmukler, L. P. Safonova

引用次数: 0

Effect of Polypropylene Percentage on Morphological and Mechanical Properties of Polybutylene Terephthalate/Polypropylene Blends 聚丙烯比例对聚对苯二甲酸丁二醇酯/聚丙烯混合物形态和机械性能的影响

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X2460042X

Pham Thi Hong Nga, Nguyen Thanh Tan

{"title":"Effect of Polypropylene Percentage on Morphological and Mechanical Properties of Polybutylene Terephthalate/Polypropylene Blends","authors":"Pham Thi Hong Nga,  Nguyen Thanh Tan","doi":"10.1134/S0965545X2460042X","DOIUrl":"10.1134/S0965545X2460042X","url":null,"abstract":"Polybutylene terephthalate (PBT) has a strong resistance to abrasion, deformation, and chemical resistance. However, how to further improve the impact toughness of PBT is still an issue that receives the attention of many researchers. This investigation aims to enhance its mechanical properties by mixing it with polypropylene (PP). The tensile strength, impact strength, flexural strength, and microstructure are accorded to ASTM D638, ASTM D256, and ASTM D790. In this analysis, PP was mixed with PBT with different ratios of 95/5, 90/10, 85/15, 80/20, and 75/25. Use injection molding technique to mold specimens for mechanical testing. The results show that the impact strength is 3.7, 6.6, 5.63, 5.2, 5.1, and 4.9 kJ/m2, corresponding to 0, 5, 10, 15, 20, and 25% PP. The impact strength of PBT/PP blends is higher than neat PBT. Especially in the 5% PP sample, the impact strength increase can reach the highest level of 80.3% compared to neat PBT. The flexural strength tends to decrease with increasing PP content. After measuring, we get 77.9, 65.6, 62.2, 58.4, 58.2, and 54.0 MPa, corresponding to 0, 5, 10, 15, 20, and 25% PP. The microstructure of the blends showed that spherical PP particles were interwoven into the PBT substrate, but no interphase adhesion was observed. In general, selecting a suitable PBT/PP blend could improve the impact strength while preserving the tensile strength, allowing it to be applied widely.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 1","pages":"86 - 94"},"PeriodicalIF":1.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Carboxymethyl Guar Gum-Based Bioactive and Biodegradable Film for Food Packaging 用于食品包装的羧甲基瓜尔胶生物活性可降解薄膜

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600388

Tanvi Singh, Meenakshi Tanwar, Rajinder K. Gupta

引用次数: 0

Preparation and Properties of Environmentally Adaptable Polyacrylamide/Polyvinyl Alcohol Semi-Interpenetrating Highly Conductive Ion-Conducting Hydrogel 环境适应性聚丙烯酰胺/聚乙烯醇半互渗高导电离子导电水凝胶的制备及其特性

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X24600352

Xinmin Huang, Yaning Wang, Xiaobin Tan, Lianhe Yang

{"title":"Preparation and Properties of Environmentally Adaptable Polyacrylamide/Polyvinyl Alcohol Semi-Interpenetrating Highly Conductive Ion-Conducting Hydrogel","authors":"Xinmin Huang, Yaning Wang, Xiaobin Tan, Lianhe Yang","doi":"10.1134/S0965545X24600352","DOIUrl":"10.1134/S0965545X24600352","url":null,"abstract":"Ionically conductive hydrogels have attracted increasing interest as skin-like sensors, however, it remains a challenge to fabricate ionically conductive hydrogels with excellent mechanical properties, high electrical conductivity, and high environmental adaptability for high-performance sensors. In this paper, LiCl was introduced into polyacrylamide/linear polyvinyl alcohol (PAM/PVA) composite hydrogels to prepare hydrogels with high ion conductivity. The introduction of LiCl endows the PAM/PVA/LiCl hydrogel with excellent stretchability, high electrical conductivity, good freezing resistance and water retention, and a wide working temperature range. Impressively, this ion-conducting hydrogel can be used for skin-like sensors with high strain sensitivity and excellent durability over 10 consecutive stretches. Therefore, wearable sensors assembled from hydrogels can be used to detect complex human activities with high stability even at –20°C. This work facilitates the development of ionically conductive hydrogels with wide operating temperatures on advanced sensing platforms.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 1","pages":"45 - 56"},"PeriodicalIF":1.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Loading of Kapok Fiber with Epoxy on Mechanical and Electrical Properties of Its Composites 木棉纤维与环氧树脂的负载对其复合材料机械和电气性能的影响

IF 1 4区化学

Polymer Science, Series A Pub Date : 2024-07-10 DOI: 10.1134/S0965545X23600692

Ramyaranjan Das, Chinmayee Dash, Dillip Kumar Bisoyi

引用次数: 0