摘要
为降低聚丙烯腈(PAN)基碳纤维生产成本,采用低成本大丝束腈纶作为前驱体,利用单宁酸的活性基团羟基对大丝束腈纶进行表面改性,制得单宁酸改性大丝束腈纶预氧化丝,研究了预氧化阶段大丝束腈纶的热环化行为。结果表明:经单宁酸溶液处理后,大丝束腈纶环化反应的起始温度从275℃降至200℃,从原来自由基聚合困难的反应转化为相对简单的离子聚合反应;改性大丝束腈纶经预氧化后氧元素质量分数从15.03%提升到27.43%,单宁酸改性显著促进了大丝束腈纶的氧化反应;改性大丝束腈纶经预氧化后体密度达到1.3746 g/cm^(3),满足后续碳化处理对纤维的结构要求,从而为后续大丝束腈纶基碳纤维制备奠定基础。
In order to reduce the production cost of polyacrylonitrile(PAN)-based carbon fiber,a low-cost large tow acrylic fiber used as the precursor was exposed to surface modification with the active hydroxyl group of tannic acid to produce tannic acid modified large tow acrylic preoxidized fiber.The thermal cyclization behavior of large tow PAN precursor was studied during the peroxidation stage.The results showed that the starting temperature of cyclization reaction of large tow acrylic precursor was reduced from 275℃ to 200℃,and the original difficult reaction of free radical polymerization was converted into relatively simple ionic polymerization after being treated with tannic acid solution;the oxygen element content of modified large tow acrylic fiber increased from 15.03%to 27.43%after pre-oxidation,and tannic acid modification significantly promoted the oxidation reaction of large tow acrylic fiber;and the bulk density of the modified large tow acrylic fiber reached 1.3746 g/cm 3 after pre-oxidation,which met the fiber structure requirements of the subsequent carbonization treatment and thus laid the foundation for the preparation of the large tow PAN-based carbon fiber.
作者
郭梅
钟俊俊
钱鑫
张永刚
宫浩婷
李春洁
GUO Mei;ZHONG Junjun;QIAN Xin;ZHANG Yonggang;GONG Haoting;LI Chunjie(College of Science and Education Integration,Ningbo University,Ningbo 315211;National Engineering Laboratory of Carbon Fiber Preparation Technology,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201)
出处
《合成纤维工业》
CAS
2023年第1期8-14,共7页
China Synthetic Fiber Industry
关键词
聚丙烯腈纤维
碳纤维
大丝束腈纶
活性基团
环化反应
改性
polyacrylonitrile fiber
carbon fiber
large tow acrylic fiber
active group
cyclization reaction
modification
