热喷涂聚酰胺12/纳米SiO_2复合涂层的非等温结晶动力学  

Non-isothermal crystallization kinetics of thermal sprayed polyamide 12/nano-SiO_2 composite coating

作　　者：李亚东[1] 强克刚[1] 张忠厚[1] 曹少魁[2] 张治军[3] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002 [2]郑州大学材料工程学院,河南郑州450052 [3]河南大学特种功能材料重点实验室,河南开封475001

出　　处：《北京化工大学学报（自然科学版）》2009年第2期62-67,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：郑州轻工业学院博士基金(2005);河南省高校杰出人才创新工程资助项目(2006KYCX007)

摘　　要：采用火焰喷涂法制备了聚酰胺12(PA12)及PA12/纳米SiO2复合涂层,利用差示扫描量热法(DSC)对PA12及其复合涂层的非等温结晶性能进行了分析,对所得的数据分别用Jeziorny法和Mo法进行处理。结果表明:用Jeziorny法和Mo法处理PA12及其复合涂层的非等温结晶过程比较理想;用Jeziorny法求出的Zc(结晶速率常数)和n(Avrami指数)均随冷却速率的增加而增加;而纳米SiO2的加入使复合涂层的Zc和n均大于纯PA12涂层,且使结晶半衰期缩短、结晶速率及结晶度增大。表明纳米SiO2具有明显的成核剂作用。Coatings of polyamide 12 （PA12） and its composites with nanometer-sized silica （nano-SiO2） were prepared by a flame spraying process. The non-isothermal crystallization behaviors of the coatings were investigated by differential scanning calorimetry （DSC）. The DSC data for non-isothermal crystallization were analyzed by the Jeziorny and the Mo models. The result indicated that both the Jeziorny and the Mo methods can be suc- cessfully used to describe the non-isothermal crystallization behaviors of flame-sprayed PA12 and its composite coatings. The values of Zc（crystallization rate parameter） and n （Avrami exponent） determined by the Jeziorny method increased with increasing cooling rate. The values of Zc and n of composite coatings containing nano- SiO2 were higher than those of PA12, whilst the half-life of crystallization was higher and the crystallization rate and crystallinity were lower. Furthermore, it was found that nano-SiO2 in the PA12 coatings acted as an effective nucleation agent.

关 键 词：火焰喷涂 聚酰胺12(PA12) 纳米SIO2 复合涂层 非等温结晶动力学 

分 类 号：O632.12[理学—高分子化学] TQ325.14[理学—化学]