摘要
通过借助红外光谱、核磁共振谱、动态热机械分析、热失重分析、X射线衍射,研究了不同共缩聚比聚芳砜酰胺(PSA)的结构与性能。结果表明:N,N-二甲基乙酰胺/氯化锂(DMAc/LiCl)和DMAc/氯化钙(CaCl2)溶剂体系解决了PSA在单一DMAc和二甲基亚砜(DMSO)溶剂中的溶解问题;PSA聚合物的组成与投入的4,4'-二氨基二苯砜和3,3'-二氨基二苯砜单体比例相一致,两种单体具有类似的反应活性;在氮气和空气氛围中,PSA聚合物的耐热性好,热分解温度与PSA聚合物组成没有关系;PSA的玻璃化转变温度会随着聚合物中对位结构的增加而有小幅度的上升;不同共缩聚比的PSA的极限氧指数均为33%,结晶性能都很低,随着PSA中对位结构的增加,其结晶性能有小幅度的增加。
The structure and properties of polysuffonamide（PSA） with different copolycondensation ratio were studied by infra- red spectrometry, nuclear magnetic resonance, dynamic mechanical analysis, thermogravimetric analysis and X-ray diffraction a- nalysis. The results showed that the solvent systems of N,N-dimethylacetamide/lithium chloride （DMAc/LiC1） and DMAc/cal- cium chloride （ CaC12 ） solved the dissolution problem of PSA in the single solvent of DMAc or dimethyl sulfoxide （DMSO） ; the composition of PSA polymer complied with the monomer ratio of 4,4＇- diaminodiphenylsulfone and 3,3＇-diaminodiphenylsulfone with the similar reaction activity; the obtained PSA polymer exhibited fairly good heat resistance and the thermal decomposition temperature had no relationship with PSA polymer composition in nitrogen and air atmosphere; the glass transition temperature of PSA was slightly increased with the increase of para-structure in the polymer; the obtained PSA with different copolycondensation ratio all had the limiting oxygen index of 33% and the crystallization property was poor, but slightly increased with the increase of para-structure in PSA.
出处
《合成纤维工业》
CAS
北大核心
2014年第4期5-9,共5页
China Synthetic Fiber Industry
