辐照交联聚四氟乙烯(XPTFE)在空气气氛下的热稳定性  

Thermal stability of radiation crosslinked polytetrafluoroethylene(XPTFE) in air

作　　者：钟磊[1,2] 杨常桥[1] 唐忠锋[1] 王谋华[1] 胡志强 吴国忠[1] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]浙江中科辐射高分子材料研发中心,嘉兴314100 [3]浙江嘉善申嘉科技有限公司,嘉兴314100

出　　处：《辐射研究与辐射工艺学报》2012年第6期333-338,共6页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(10775173)资助

摘　　要：与未交联聚四氟乙烯相比,交联聚四氟乙烯(XPTFE)具有耐磨性高、透明性好、熔点降低等特点。由于XPTFE在实际应用中可能需要经过高温加工成型或烧结工艺。因此,本工作重点研究了在340℃-400℃温度范围、空气气氛下XPTFE的热稳定性能,并与未交联PTFE在相同条件下的热稳定性进行了对比。研究发现,经过高温热处理后,XPTFE的熔点和结晶温度上升、分子量降低,且片材形变明显,表明XPTFE比常规PTFE的热稳定性低,而且交联度越高,热稳定性越低。综合考虑交联PTFE的耐温特性,认为PTFE的交联剂量控制在100kGy以内较好。Radiation crosslinked polytetrafluoroethylene （XPTFE） has many properties compared to non-crosslinked PTFE, such as excellent friction resistance, better transparency and lower melting point, which may be applied for high temperature processing or sintering. In this paper the thermal stability of a series of XPTFE sam- ples thermally treated over 340℃ --400℃ in airwas investigated. It was found that melting point and crystallization temperature of XPTFE increased, meanwhile morphology deformation and decrement of molecular weight was also observed after thermal treatment. It indicates that the thermal stability of XPTFE becomes poorer along with the in- crement of the irradiation crosslinking dose. It can be suggested that the optimal dose for preparing XPTFE should be less than 100 kGy as the thermal stability of XPTFE is dependent on the crosslingking dose.

关 键 词：辐照交联 交联聚四氟乙烯 热稳定性 

分 类 号：O644.2[理学—物理化学] TQ314.2[理学—化学]