接触角
热重分析
纤维素
表面改性
材料科学
傅里叶变换红外光谱
热稳定性
稻草
纤维素纤维
响应面法
化学改性
纳米纤维素
元素分析
复合材料
化学工程
化学
高分子化学
有机化学
色谱法
无机化学
工程类
作者
Mandeep Singh,Anupama Kaushik,Dheeraj Ahuja
标识
DOI:10.1016/j.carbpol.2016.04.109
摘要
Aggregates of microfibrillated cellulose isolated from wheat straw fibers were subjected to propionylation under different processing conditions of time, temperature and concentration. The treated fibers were then homogenized to obtain surface modified nanofibrillated cellulose. For varying parameters, progress of propionylation and its effects on various characteristics was investigated by FTIR, degree of substitution, elemental analysis, SEM, EDX, TEM, X-ray diffraction, static and dynamic contact angle measurements. Thermal stability of the nanofibrils was also investigated using thermogravimetric technique. FTIR analysis confirmed the propionylation of the hydroxyl groups of the cellulose fibers. The variations in reaction conditions such as time and temperature had shown considerable effect on degree of substitution (DS) and surface contact angle (CA). These characterization results represent the optimizing conditions under which cellulose nanofibrils with hydrophobic characteristics up to contact angle of 120° can be obtained.
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