丙烯腈/β-衣康酸单甲酯共聚物制备及性能的研究

以丙烯腈和β-衣康酸单甲酯为共聚单体,偶氮二异丁腈为引发剂,使用自由基溶液聚合的方法在二甲基亚砜体系中制备丙烯腈共聚物。测试聚合体系的转化率、牛顿黏度和黏均分子质量,采用DSC分析了丙烯腈/β-衣康酸单甲酯共聚物的热性能,并测试了其原丝的力学性能。研究结果表明:丙烯腈/β-衣康酸单甲酯共聚物的黏均分子质量达到了1.28×105,β-衣康酸单甲酯有效降低了共聚物的放热起始温度,纺制出的原丝强度高达8.8 cN/dtex,性能稳定。

Preparation and Study of Acrylonitrile/β-methylhydrogen Itaconic Copolymer

Free-radical solution copolymerization of acrylonitrile（AN） and itaconic acid（IA） were carried out in dimethyl sulphoxide（DMSO） using azodiisobutyronitrile（AIBN） as the initiator.By means of modification treatment,the itaconic acid was esterified to β-methylhydrogen itaconic and then copolymerized with AN.The conversion,Newtonian viscosity and viscosity-average molecular weight of the polymer system were tested.The acrylonitrile/β-methylhydrogen itaconic copolymer thermal properties were studied via differential scanning calorimetry（DSC）,and the mechanical properties of precursor fiber were tested.The results showed that viscosity-average molecular weight of the acrylonitrile/β-methylhydrogen itaconic copolymer was 1.28×105,β-methylhydrogen itaconic could effectively reduce the initial temperature,and the tenasity of precursor fiber was 8.8 cN/dtex,the mechanical properties were stable.