甲壳素纳米晶须/壳聚糖共混溶液的制备及其流变行为

Preparation and Rheological Behavior of Chitin Nanowhisker/Chitosan Blend Solution

甲壳素纳米晶须(CW)是一种高强、高模、具有生物相容性和生物降解性的纳米增强填料.将CW与壳聚糖的乙酸溶液共混,研究其对壳聚糖溶液流动行为的影响.研究结果表明,随着CW的加入,壳聚糖溶液的表观黏度增大,但随着剪切速率的增大,这种影响消失.CW与壳聚糖分子间产生了氢键相互作用,增大了壳聚糖分子链移动的阻力,松弛时间变长,储能模量与损耗模量交点向低频方向移动,溶液更易表现出弹性特征.

Chitin nanowhisker （CW） is reinforcing nanofiller possessing high strength, high modulus, and good biocompatibility and biodegradability. CWs were introduced into chitosan/acetic acid aqueous solution, and the effects of CWs on the rheological behavior of chitosan solution were investigated. The results showed that the loading of CWs increased the apparent viscosity of chitosan solution,＇but it disappeared at a higher shear rate. CWs could form hydrogen bonds with chitosan chains, which provided crosslinking points and restricted the chain movement of chitosan, leading to a longer relaxation time. Thus, the intersection point of storage modulus and loss modulus moved to lower frequency, indicating the loading of CWs caused more elastic characteristic to chitosan solution.