不同组成丙烯腈共聚物的玻璃化转变温度和染色性能研究
Influence of the composition of acrylonitrile copolymer on its glass transition temperature and dying properties
郭迎馨 1葛世洁 1王炎庆 1王彪1
作者信息
- 1. 东华大学材料科学与工程学院,上海 201620;东华大学纤维材料改性国家重点实验室,上海 201620
- 折叠
摘要
聚合物玻璃化转变温度(Tg)是影响纤维使用性能的关键指标,为改善聚丙烯腈纤维的染色性能,采用水相沉淀法制备不同摩尔配比的丙烯腈、丙烯酸甲酯(MA)和甲基丙烯磺酸钠(MAS)的两元和三元丙烯腈共聚物(PAN).使用红外光谱仪、核磁共振氢谱仪、差示扫描量热仪、紫外-可见分光光度仪对共聚物的结构、性能进行表征.结果发现,当第二单体MA含量增加,Tg 呈下降趋势,当MA含量为40%时,Tg 为53.7℃.当MA含量为 30%时,MAS增加对Tg 的影响并不显著,当MAS含量为2%时,Tg 为 67.7℃,当MAS含量为5%时,Tg 为67.9℃.对常规聚丙烯腈、丙烯腈三元共聚物进行染色,其平衡上染率(染色温度为70℃)从43.5%增加到99.9%.丙烯腈共聚物的Tg 和染色性能可以通过改变第二单体MA和第三单体MAS的比例来进行调控.
Abstract
The glass transition temperature(Tg)of the polymer is a key factor affecting the performance of its fibers.In this paper,a series of acrylonitrile copolymers(PAN)with different molecular compositions were pre-pared by aqueous precipitation polymerization,and the relationship between composition of the copolymer and its Tg were studied.The results showed that with the increasing of second monomer methyl acrylate(MA)in the copoly-mer,Tg decreased obviously.When the MA content was 40%,Tg reached 53.7℃,which decreased to about 40%of conventional polyacrylonitrile(Tg was about 90℃).The incorporating with third monomer,sodium methacry-late sulfonate(MAS),had no significant effect on Tg.When MAS content was 2%,Tg was 67.7℃,and when MAS content was 5%,Tg was 67.9℃.When the conventional polyacrylonitrile and acrylonitrile terpolymer were dyed,the equilibrium dyeing rate(dyeing temperature was 70℃)increased from 43.5%to 99.9%.It can be seen that the Tg of acrylonitrile copolymer can be regulated by changing the proportion of the second mono-mer MA.The dyeing properties of acrylonitrile copolymers can be controlled by changing the ratio of the sec-ond monomer MA to the third monomer MAS.
关键词
丙烯腈共聚物/丙烯酸甲酯/甲基丙烯磺酸钠/水相沉淀法/玻璃化转变温度/染色性能Key words
acrylonitrile copolymers/methyl acrylate/sodium methacrylate sulfonate/aqueous precipitation polymerization/glass-transition temperature/dyeing property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据