辐射接枝苯乙烯和磺化对聚四氟乙烯强酸性纤维力学性能...
辐射接枝苯乙烯和磺化对聚四氟乙烯强酸性纤维力学性能的影响THE INVESTIGATION OF THE INFLUENCEON MECHANICAL PROPERTIES OF STYRENE GRAFTED POLYTETRAFLUOROETHYLENE （PTFE） FIBERVIA RADIATION-INDUCED POLYMERIZATIONAND SULFONATION
作 者：魏俊富 李慧 张政朴
WEI Junfu LI Hui ZHANG Zhengpu（1. Tianjin Municipal Key Lab. of Fiber Modification and Functional Fiber, College of Materialand Chemical Engineering, Tianjin Polytechnic University, Tianjin 300160, China;2. Key Lab. of Adsorption and Separation of Functional Polymer Materials of Mnistry ofEducation, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China）
机构地区：天津市改性与功能纤维重点实验室天津工业大学材料化工学院,天津300160 吸附分离功能高分子教育部重点实验室南开大学高分子化学研究所,天津300071
出 处：《离子交换与吸附》 CAS CSCD 2007年第23卷第6期 519-530页,共12页
Ion Exchange and Adsorption
基 金：天津市科技发展计划项目（06TXTJJC14400）和天津市教育委员会科研基金（20041011）
摘 要：采用共辐射引发将苯乙烯接枝到聚四氟乙烯（PTFE）纤维上后，然后磺化可以制备出强酸性离子交换纤维PTFE-g-St-SO3H．辐射、磺化和氧气可以使纤维力学性能大幅度下降，当接枝率较低时，断裂强度高于原纤维，随着接枝率的增大，断裂强度呈下降趋势。轻度交联能够改善纤维的力学性能，但是对纤维力学性能的影响比接枝率小。断裂强度与磺化率关系不大，主要受磺化反应温度影响，反应温度越高，断裂强度越低，断裂伸长率也相应较低。磺化后模量大幅度降低，断裂伸长率和屈服伸长率显著增大，断裂强度明显降低，纤维韧性提高。采用氮气保护，控制适当接枝率和较低磺化反应温度可以得到力学性能较好的PTFE基强酸性离子交换纤维。
Strong acidic fibers （PTFE-co-St-SO3H） have been prepared by radiation-induced graft polymerization of styrene onto polytetrafluoroethylene （PTFE） fiber followed by sulfonation. The breaking strength of grafted fibers becomes worse greatly caused by radiation, sulfonation and oxygen. The breaking strength of grafted fiber increased with the increasing of grafting degree of styrene onto PTFE when grafting degree was lower than 34.76%, and decreased with the increasing of grafting degree continuously. Light crosslinking can improve the grafted fibers＇ mechanical properties, its influence on mechanical property is lower than the increasing of grafting degree. The breaking strength of sulfonated fiber mainly depends on reacting temperature, meanwhile it is not relationship with the degree of sulfonation. The higher of sulfonating temperature is, the lower of the breaking strength and the breaking length of sulfonated fiber. The modulus of stretch decreases greatly after sulfonation, the length of breaking and yielding ascend obviously, and the breaking strength descend greatly, that means the toughness of sulfonated fiber improved. The strong acidic ion exchange fiber based on PTFE with relatively excellent mechanical property could be gained at lower sulfonating temperature, proper crosslinking degree and γ-irradiation grafting in N2 atmosphere.
关 键 词：聚四氟乙烯纤维 辐射接枝 苯乙烯 磺化 力学性能
Polytetrafluoroethylene fiber Radiation-induced grafting Styrene Sulfonation Mechanical property.
分 类 号： TQ341 [工业技术 > 化学工业 > 化学纤维工业]
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