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芳纶1414(PPTA)以其高强度、高模量、耐化学腐蚀的特性,被广泛应用于航空航天、电器和特种品开发等领域。采用低温溶液缩聚法,在二甲基乙酰胺(DMAC)-氯化锂(LiCl)溶剂体系中引入4,4′-二氨基二苯砜(4,4′-DDS)作为第三单体,对PPTA进行改性。并对改性PPTA进行表征。研究反应温度、LiCl含量以及第三单体含量对共聚物比浓对数黏度的影响。先加入第三单体且添加量为30%(摩尔百分用量),LiCl用量为1.6%(wt,质量分数),第二阶段反应温度为80℃时,制得的改性PPTA比浓对数黏度为2.52mL/g,在氮气气氛下的分解温度为500℃,具有较好的耐高温性能。
Kevlar 1414 (PPTA) is widely used in the fields of aerospace, electrical appliances and specialty product development due to its high strength, high modulus and chemical resistance. Using the low temperature solution polycondensation method, 4,4’-diaminodiphenyl sulfone (4,4’-DDS) was introduced into the DMAC-LiCl solvent system as the third monomer, PPTA modified. The modified PPTA was characterized. The effects of reaction temperature, LiCl content and the third monomer content on the inherent viscosity of copolymer were investigated. The third monomer was added first and added in an amount of 30% (mole percent), LiCl was 1.6% (wt, mass fraction), and the second stage reaction temperature was 80 ℃. The number viscosity of 2.52mL / g, under a nitrogen atmosphere decomposition temperature of 500 ℃, has good high temperature performance.