Enhanced thermal and mechanical properties of PVA composites formed with filamentous nanocellulose fibrils

被引：89

作者：

Li, Wei ^{[1
,2
]}

Wu, Qiong ^{[1
]}

Zhao, Xin ^{[1
]}

Huang, Zhanhua ^{[1
]}

Cao, Jun ^{[2
]}

Li, Jian ^{[1
]}

Liu, Shouxin ^{[1
]}

机构：

[1] Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Peoples R China

[2] Northeast Forestry Univ, Coll Mech & Elect Engn, Harbin 150040, Peoples R China

来源：

CARBOHYDRATE POLYMERS | 2014年 / 113卷

基金：

中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;

关键词：

Nanocellulose fibrils; CTMP; Ultrasonication; Poly(vinyl alcohol); POLY(VINYL ALCOHOL); WHEAT-STRAW; CELLULOSE FIBERS; DEGRADATION; DEPOLYMERIZATION; NANOCRYSTALS; ULTRASOUND; NANOFIBERS; COMPONENTS; CHEMISTRY;

D O I：

10.1016/j.carbpol.2014.07.031

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Long filamentous nanocellulose fibrils (NCFs) were prepared from chemical-thermomechanical pulps (CTMP) using ultrasonication. Their contribution to enhancements in thermal stability and mechanical properties of poly(vinyl alcohol) films were investigated. The unique chemical pretreatment and mechanical effects of CTMP loosen and unfold fibers during the pulping process, which enables further chemical purification and subsequent ultrasound treatment for formation of NCFs. The NCFs exhibited higher crystallinity (72.9%) compared with that of CTMP (61.5%), and had diameters ranging from 50 to 120 nm. A NCF content of 6 wt% was found to yield the best thermal stability, light transmittance, and mechanical properties in the PVA/NCF composites. The composites also exhibited a visible light transmittance of 73.7%, and the tensile strength and Young's modulus were significantly improved, with values 2.8 and 2.4 times larger, respectively, than that of neat PVA. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：403 / 410

页数：8

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