【摘要】 对尼龙 10 10的加成型化学扩链做了系统的研究 ,并对 2 ,2′ 双 (2 唑啉 ) (BOZ)和 1,4 双 (2 唑啉基 )苯 (PBO)的偶联效果和扩链产物的性能做了详细的探讨 ,前者的扩链效果较好 .研究结果表明 ,尼龙10 10熔体的转矩随着反应时间的延长显著增加 .但转矩达到极大值后开始缓慢下降 ,表明扩链产物在高温条件下发生热降解 .扩链剂的用量存在最佳值 ,用量不足时偶联反应不充分 ,用量过量时封端反应加剧 .扩链以后尼龙 10 10的端羧基含量大大降低 ,反应温度对反应速率的影响符合阿累尼乌斯关系式 .扩链产物极限粘度大大高于尼龙原料 ,表明分子量显著提高更多还原

【Abstract】 Bisoxazolines have been recently applied as chemical chain extenders of some polymers.The reaction behaviors of bisoxazolines,as adding-type chain extenders,have been studied to evaluate their coupling effects as the chain extenders for polyaimde1010 (PA1010).2,2′-bis-(2-oxazoline) (BOZ) and 1,4-bis-(4,5-dihydro-2-oxazolyl)benzene (PBO) were tested,the former of which gave the better results.It had been shown that the torque of PA1010 melt increased dramatically with reaction time after the addition of chain extender.However,a slow decrease of torque could be found in the later stage of the chain extension reaction,probably due to degradation of chain-extended products at high temperature.There existed an optimal dosage of the chain extender,lack of which caused deficiency of chain extension and excess of which led to more blocking reaction.The end carboxyl group concentration of polyamide1010 decreased dramatically after chain extension.The effect of temperature on the chain extension reaction rate accorded with the Arrhenius exponential formula.The intrinsic viscosity of chain-extended products was much higher than that of the virgin PA,indicating that the molecular weight had been obviously enhanced.更多还原