PA11/SiC复合材料非等温结晶动力学研究
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摘要
通过熔融共混法制备了尼龙11/碳化硅(PA11/SiC)复合材料,利用差示扫描量热仪(DSC)研究了该复合材料的非等温结晶过程,且采用Avrami方程修正的Jeziorny法和Mo法对其非等温结晶动力学进行了研究,并计算得到相关非等温结晶动力学参数。结果表明:Jeziorny法和Mo法都适用于处理PA11及PA11/SiC复合材料的非等温结晶过程,其分析结果均显示,SiC的加入影响了PA11复合材料的非等温结晶行为,少量(1%)SiC的加入促进了PA11复合材料的成核及晶体生长,提高了结晶速率;由Jeziorny法可知,PA11及其复合材料的非等温过程可分为初期结晶和二次结晶两个阶段,在二次结晶阶段,结晶方式为一维线性、二维盘状和三维球晶生长并存。
Polyamide11/silicon carbide(PA11/SiC) composites were prepared by melt-blending method.The nonisothermal crystallization behaviors of the composites were investigated by differential scanning calorimetry(DSC).Moreover,its non-isothermal crystallization kinetics was studied by Jeziorny and Mo methods,and correlative non-isothermal crystallization kinetic parameters were obtained.The results show that both the above equation can describe the nonisothermal crystallization of PA11 and PA11/SiC composites well.The non-isothermal crystallization kinetics parameters from Jeziorny and Mo methods both show that the addition of SiC can affect the non-isothermal crystallization behaviors of PA11/SiC composites,the nucleation and crystal growth of the composites could be promoted by adding 1% SiC,and so does the crystallization rate of the composites.In addition,it’s known by Jeziorny method that there are two stage in the non-isothermal crystallization of PA11 and PA11/SiC composites,the primary crystallization stage and the secondary crystallization stage.The crystal forms of the secondary crystallization stage are one-dimensional linear,two-dimensional disk-shaped and three-dimensional spherulite growth coexisting.
Polyamide11/silicon carbide(PA11/SiC) composites were prepared by melt-blending method.The nonisothermal crystallization behaviors of the composites were investigated by differential scanning calorimetry(DSC).Moreover,its non-isothermal crystallization kinetics was studied by Jeziorny and Mo methods,and correlative non-isothermal crystallization kinetic parameters were obtained.The results show that both the above equation can describe the nonisothermal crystallization of PA11 and PA11/SiC composites well.The non-isothermal crystallization kinetics parameters from Jeziorny and Mo methods both show that the addition of SiC can affect the non-isothermal crystallization behaviors of PA11/SiC composites,the nucleation and crystal growth of the composites could be promoted by adding 1% SiC,and so does the crystallization rate of the composites.In addition,it’s known by Jeziorny method that there are two stage in the non-isothermal crystallization of PA11 and PA11/SiC composites,the primary crystallization stage and the secondary crystallization stage.The crystal forms of the secondary crystallization stage are one-dimensional linear,two-dimensional disk-shaped and three-dimensional spherulite growth coexisting.
引文
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[2]张庆新,莫志深.尼龙11结构和性能的研究进展[J].高分子通报,2001(6):27-37.
[3]汪多仁.尼龙11的性质、应用与制法[J].黎明化工,1996(3):15-20.
[4]纪秋龙,章明秋,容敏智,等.纳米碳化硅填充环氧树脂复合材料的摩擦磨损特性[J].复合材料学报,2004,21(6):14-20.
[5]王守国,张岩.SiC材料及器件的应用发展前景[J].自然杂志,2011,33(1):42-53.
[6]田广来,徐永东,范尚武,等.高性能C/SiC刹车材料及其优化设计[J].复合材料学报,2008,25(2):101-108.
[7]李春华,齐暑华,张剑.碳化硅在聚合物中的应用[J].中国塑料,2006,20(5):10-12.
[8]李迎春,胡国胜,唐卫平,等.尼龙11/蒙脱土纳米复合材料的结晶行为[J].高分子材料科学与工程,2006,22(4):172-175.
[9]Wu meng,Yang guizhong,Wang min,et al.Nonisothermalcrystallization kinetics of ZnO filled polyamide 11composites[J].Materials Chemistry and Physics,2008,109:547-555.
[10]赵清香,刘民英,王玉东,等.用DSC研究尼龙69的非等温结晶和等温结晶动力学[J].郑州大学学报,1995,27(2):48-52.
[11]王志强,张云升,张凯,等.PA11/白炭黑纳米复合材料非等温结晶动力学研究[J].工程塑料应用,2012,40(5):70-73.
[12]铁生年,李星.硅烷偶联剂对碳化硅粉体的表面改性[J].硅酸盐学报,2011,39(3):409-413.
[13]Jeziorny.Parameters characterizing the kinetics of thenon-isothermal crystallization of poly(ethylene terphthalate)determined by DSC[J].Polymer,1978,19:1 142-1 144.
[14]Liu T X,Mo Z S,Wang S G,et al.Isothermal melt and coldcrystallization kinetics of poly(aryl ether ketone ketone)(PEEKK)[J].Euro Polym J,1997,33(9):1 405-1 414.