{"title":"纳米纤维素增强型水溶性醋酸纤维素薄膜的制备与表征","authors":"Hongrun Chen , Gaoyuan Hou , Korawit Chitbanyong , Miyuki Takeuchi , Izumi Shibata , Akira Isogai","doi":"10.1016/j.reactfunctpolym.2024.106083","DOIUrl":null,"url":null,"abstract":"<div><div>A water-soluble cellulose acetate (CA) with a degree of acetyl substitution of 0.9 was dissolved in water and mixed with aqueous dispersions of reinforcing cellulose nanofibers (CNFs) at various mass ratios. CA/CNF composite films with CNF contents of 0 %–16 % were prepared by casting and drying the mixtures to improve the fundamental properties of the films. Aqueous dispersions of TEMPO-CNFs containing sodium carboxylate and protonated carboxy groups were separately prepared and used to produce CA composite films (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl radical). Highly transparent CA/TEMPO-CNF films with tensile strengths and Young's moduli more than twofold those of the 100 % CA film were obtained at a TEMPO-CNF content of 16 %. Transmission electron microscopy images of the film cross-sections showed that the TEMPO-CNFs were almost homogeneously and individually distributed in the CA/TEMPO-CNF-COOH composite films. The thermal expansion patterns of the 100 % CA films were characteristically wavy between 30 and 100 °C, and the thermal expansion ratios decreased as the TEMPO-CNF contents of the films increased. The obtained results indicate that CA/CNF mixtures can be used as water-based coatings and paints with favorable properties.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106083"},"PeriodicalIF":4.5000,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Preparation and characterization of nanocellulose-reinforced water-soluble cellulose acetate films\",\"authors\":\"Hongrun Chen , Gaoyuan Hou , Korawit Chitbanyong , Miyuki Takeuchi , Izumi Shibata , Akira Isogai\",\"doi\":\"10.1016/j.reactfunctpolym.2024.106083\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>A water-soluble cellulose acetate (CA) with a degree of acetyl substitution of 0.9 was dissolved in water and mixed with aqueous dispersions of reinforcing cellulose nanofibers (CNFs) at various mass ratios. CA/CNF composite films with CNF contents of 0 %–16 % were prepared by casting and drying the mixtures to improve the fundamental properties of the films. Aqueous dispersions of TEMPO-CNFs containing sodium carboxylate and protonated carboxy groups were separately prepared and used to produce CA composite films (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl radical). Highly transparent CA/TEMPO-CNF films with tensile strengths and Young's moduli more than twofold those of the 100 % CA film were obtained at a TEMPO-CNF content of 16 %. Transmission electron microscopy images of the film cross-sections showed that the TEMPO-CNFs were almost homogeneously and individually distributed in the CA/TEMPO-CNF-COOH composite films. The thermal expansion patterns of the 100 % CA films were characteristically wavy between 30 and 100 °C, and the thermal expansion ratios decreased as the TEMPO-CNF contents of the films increased. The obtained results indicate that CA/CNF mixtures can be used as water-based coatings and paints with favorable properties.</div></div>\",\"PeriodicalId\":20916,\"journal\":{\"name\":\"Reactive & Functional Polymers\",\"volume\":\"205 \",\"pages\":\"Article 106083\"},\"PeriodicalIF\":4.5000,\"publicationDate\":\"2024-10-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Reactive & Functional Polymers\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S138151482400258X\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reactive & Functional Polymers","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S138151482400258X","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
Preparation and characterization of nanocellulose-reinforced water-soluble cellulose acetate films
A water-soluble cellulose acetate (CA) with a degree of acetyl substitution of 0.9 was dissolved in water and mixed with aqueous dispersions of reinforcing cellulose nanofibers (CNFs) at various mass ratios. CA/CNF composite films with CNF contents of 0 %–16 % were prepared by casting and drying the mixtures to improve the fundamental properties of the films. Aqueous dispersions of TEMPO-CNFs containing sodium carboxylate and protonated carboxy groups were separately prepared and used to produce CA composite films (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl radical). Highly transparent CA/TEMPO-CNF films with tensile strengths and Young's moduli more than twofold those of the 100 % CA film were obtained at a TEMPO-CNF content of 16 %. Transmission electron microscopy images of the film cross-sections showed that the TEMPO-CNFs were almost homogeneously and individually distributed in the CA/TEMPO-CNF-COOH composite films. The thermal expansion patterns of the 100 % CA films were characteristically wavy between 30 and 100 °C, and the thermal expansion ratios decreased as the TEMPO-CNF contents of the films increased. The obtained results indicate that CA/CNF mixtures can be used as water-based coatings and paints with favorable properties.
期刊介绍：
Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers.
Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.
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