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采用核磁共振氢谱(~1H-NMR)对经4,4’-二氨基二苯砜(4,4’-DDS)改性后的聚对苯二甲酰间苯二胺(co-PMTA_3)进行化学结构表征;研究了co-PMTA_3的溶解性和热性能,并与对位聚芳砜酰胺(p-PSA)和常规聚芳砜酰胺(co-PSA)进行了比较;采用湿法纺丝方法制得了co-PMTA_3初生纤维,将初生纤维经340℃热拉伸1.4倍后制得线密度为10 dtex的co-PMTA_3纤维,研究了co-PMTA_3纤维的力学性能。结果表明:coPMTA_3为4,4’-DDS与间苯二胺及对苯二甲酰氯按其摩尔比为2.5/7.5/10的共聚物;co-PMTA_3的溶解性强于pPAS,但比co-PSA要弱;co-PMTA_3有较好的耐热性,其玻璃化转变温度达318.4℃,低于p-PSA的367.7℃和coPSA的343.1℃;co-PMTA_3纤维的断裂强度为4.7 cN/dtex,初始模量为56.5 cN/dtex,打结强度为2.2 cN/dtex。
The poly (m-phenylenediamine-co-PMTA_3) modified by 4,4’-diaminodiphenyl sulfone (4,4’-DDS) was characterized by 1H- The solubility and thermal properties of co-PMTA_3 were studied and compared with the para-sulfonamide (p-PSA) and the conventional poly-sulfonamide (co-PSA) Methods Co-PMTA_3 primary fibers were obtained. Co-PMTA_3 fibers with linear density of 10 dtex were obtained by thermal drawing primary fibers at 340 ℃ for 1.4 times. The mechanical properties of co-PMTA_3 fibers were studied. The results showed that: coPMTA_3 is a copolymer of 4,4’-DDS and m-phenylenediamine and terephthaloyl chloride at a molar ratio of 2.5 / 7.5 / 10; co-PMTA_3 is more soluble than pPAS but co- PSA was weaker; co-PMTA_3 had better heat resistance, the glass transition temperature was 318.4 ℃, lower than that of p-PSA at 367.7 ℃ and coPSA of 343.1 ℃; the fracture strength of co-PMTA_3 fiber was 4.7 cN / dtex , Initial modulus of 56.5 cN / dtex, knot strength of 2.2 cN / dtex.