化学
凝胶渗透色谱法
傅里叶变换红外光谱
羟乙基纤维素
纤维素
摩尔质量分布
水解
摩尔质量
酶水解
聚合物
粘度计
色谱法
动力学
高分子化学
核化学
有机化学
化学工程
材料科学
复合材料
工程类
粘度
物理
量子力学
作者
Yong-Fu Diao,Mingwei Song,Yulin Zhang,Linying Shi,Yusan Lv,Rong Ran
标识
DOI:10.1016/j.carbpol.2017.02.089
摘要
The enzymatic degradation behavior of hydroxyethyl cellulose (HEC) samples with different molar substitutions (MS) values was investigated. The changes in the molecular structure of HEC treated with enzymatic approach in comparison to the native HEC were studied through nuclear magnetic resonance (NMR), fourier transform infrared spectra (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques and kinetics of degradation was studied by viscometry. The cleavage of HEC chains could be observed from FTIR and kinetics results. Moreover, reduce in molecular weight (Mw) of polymer and liberated glucose concentration was investigated by gel permeation chromatography (GPC) analysis during enzymatic degradation. And all these results indicated that HEC with lower MS is more susceptible to degrade and provided a better understanding of the mechanism operating during enzymatic hydrolysis of HEC by cellulases. Furthermore, by complete degradation and quantification of liberated glucose, the substitution index (SI) and the distribution of substituents along the HEC chain were investigated. The results suggested that the HEC samples differed in hydroxyethyl molar substitutions (MS) and possible distribution of the hydroxyethyl groups. Impressively, our efforts established a facile analytical method for the elucidation of the distribution of substituents along the HEC chain.
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