铵盐催化剂对木浆粘胶纤维热处理中结构与性能的影响  

Effect of ammonium salt catalyst on structure and properties of wood-pulp viscose fiber during heat treatment

作　　者：蔡蔚葵 陈惠芳[1] 

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《合成纤维工业》2016年第4期49-53,共5页China Synthetic Fiber Industry

摘　　要：选择木浆粘胶纤维作为前驱体,采用催化剂硫酸铵[(NH4)2SO4]和氯化铵(NH4Cl)对粘胶纤维进行催化处理,制备粘胶基碳纤维。研究了催化剂对粘胶纤维在热处理过程中纤维结构与性能的影响。结果表明:(NH4)2SO4和NH4Cl均能有效降低纤维的初始热失重温度和失重率,NH4Cl对失重温度降低的幅度较大,(NH4)2SO4对失重率降低的幅度较大;在高温下铵盐催化剂均会与纤维素发生反应生成有机胺盐,达到催化的目的;在低温热处理过程中,随着温度的升高,纤维取向度先降低后升高,在210℃左右,取向度到达最低点;在热处理结束时,经(NH4)2SO4处理的纤维的取向度要比经NH4Cl处理的高,纤维内部结构排列更加有序,有利于后续碳化工艺的进行;(NH4)2SO4的催化效果要比NH4Cl的好。Wood-pulp viscose fiber was used as a precursor and treated with ammonium sulfate （ NH4 ） 2 SO4 and ammonium chloride NH4 Cl catalysts to produce a rayon-based carbon fiber .The effects of the catalysts on the structure and properties of the viscose fiber were studied during heat treatment .The results showed that （NH4）2SO4 and NH4Cl could efficiently decrease the initial thermal weight loss temperature and weight loss rate;NH4 Cl caused the greater decrease of weight loss temperature when （ NH4 ） 2 SO4 caused the greater decrease of the weight loss rate;the ammonium salt catalysts provided the catalytic effect by reac-ting with cellulose to generate organic ammonium salt at high temperatures;the degree of orientation of the fiber was decreased to a minimum value at 210 ℃ and then increased while elevating the temperature during the low-temperature heat treatment; as compared with NH4Cl, （NH4）2SO4 contributed the higher degree of orientation and the more uniform internal structure arrange -ment to the fiber at the end of heat treatment , which was beneficial to the subsequent carbonization process;and （ NH4 ） 2 SO4 pro-vided better catalytic effect than NH 4 Cl.

关 键 词：木浆基粘胶纤维 碳纤维 铵盐催化剂 取向度 

分 类 号：TQ341.1[化学工程—化纤工业] TQ342.74