Yu Qingqing, Yang Weijun, Wang Qianqian, Dong Weifu, Du Mingliang, Ma Piming
The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China.
The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China.
Carbohydr Polym. 2019 Aug 1;217:168-177. doi: 10.1016/j.carbpol.2019.04.049. Epub 2019 Apr 13.
In this work, functionalized cellulose nanocrystal (fCNC) was obtained by the grafting of 3-methacryloxypropyltrimethoxysilane coupling agent (γ-MPS) onto CNC. Then acrylic pressure sensitive adhesive (PSA) incorporated with various contents of CNC or fCNC was successfully synthesized by an in-situ emulsion polymerization, and the effects of CNC or fCNC on the sol molecular weight, latex properties, thermal properties, viscoelastic properties, and adhesive performance of the acrylic PSA were investigated. The results illustrated a coinstantaneous improvement of tack, shear strength and peel strength with increasing the loading of both CNC and fCNC. Interestingly, fCNC showed much more improvement than CNC on adhesive performance of acrylic PSA. The fCNC-1/acrylic PSA showed tack of 27#, shear strength of 70 h, and peel strength of 13.4 N/25mm, which were 12.5%, 4%, and 106% higher than those of CNC-1/acrylic PSA and 35%, 100%, and 163% higher than those of neat acrylic PSA, respectively. The superior adhesive performance of the fCNC/acrylic PSA films was supposed to be attributed to better compatibility and dispersion of fCNC in the acrylic copolymer. Thus, this work presents a feasible strategy for utilization of CNC in adhesives and coatings.
在本工作中，通过将3-甲基丙烯酰氧基丙基三甲氧基硅烷偶联剂（γ-MPS）接枝到纤维素纳米晶体（CNC）上，获得了功能化纤维素纳米晶体（fCNC）。然后，通过原位乳液聚合成功合成了含有不同含量CNC或fCNC的丙烯酸压敏胶（PSA），并研究了CNC或fCNC对丙烯酸PSA的溶胶分子量、乳胶性能、热性能、粘弹性性能和粘合性能的影响。结果表明，随着CNC和fCNC含量的增加，粘性、剪切强度和剥离强度同时提高。有趣的是，fCNC对丙烯酸PSA粘合性能的改善比CNC要大得多。fCNC-1/丙烯酸PSA的粘性为27#，剪切强度为70小时，剥离强度为13.4 N/25mm，分别比CNC-1/丙烯酸PSA高12.5%、4%和106%，比纯丙烯酸PSA高35%、100%和163%。fCNC/丙烯酸PSA薄膜优异的粘合性能被认为归因于fCNC在丙烯酸共聚物中更好的相容性和分散性。因此，本工作为CNC在粘合剂和涂料中的应用提供了一种可行的策略。
