Preparation of Cellulose Nanofibril/Regenerated Silk Fibroin Composite Fibers

丝素 材料科学 丝绸 复合数 甲酸 复合材料 纤维素 结晶度 纳米复合材料 纤维 结晶 化学工程 流变学 化学 色谱法 工程类
作者
Ji Hye Lee,Chang Hyun Bae,Byung‐Dae Park,In Chul Um
出处
期刊:International journal of industrial entomology [Korean Society of Sericultural Science]
卷期号:26 (2): 81-88 被引量:14
标识
DOI:10.7852/ijie.2013.26.2.81
摘要

Wet-spun silk fibers have attracted the attention of many researchers because of 1) the unique properties of silk as a biomaterial, including good biocompatibility and cyto-compatability and 2) the various methods available to control the structure and properties of the fiber.Cellulose nanofibrils (CNFs) have typically been used as a reinforcing material for natural and synthetic polymers.In this study, CNF-embedded silk fibroin (SF) nanocomposite fibers were prepared for the first time.The effects of CNF content on the rheology of the dope solution and the characteristics of wet-spun CNF/SF composite fibers were also examined.A 5% SF formic acid solution that contained no CNFs showed nearly Newtonian fluid behavior, with slight shear thinning.However, after the addition of 1% CNFs, the viscosity of the dope solution increased significantly, and apparent shear thinning was observed.The maximum draw ratio of the CNF/SF composite fibers decreased as the CNF content increased.Interestingly, the crystallinity index for the silk in the CNF/SF fibers was sequentially reduced as the CNF content was increased.This phenomenon may be due to the fact that the CNFs prevent b-sheet crystallization of the SF by elimination of formic acid from the dope solution during the coagulation process.The CNF/SF composite fibers displayed a relatively smooth surface with stripes, at low magnification (x500).However, a rugged nanoscale surface was observed at high magnification (x10,000), and the surface roughness increased with the CNF content.

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