迟晓红
,
俞利
,
郑杰
,
高俊国
,
张晓虹
复合材料学报
doi:10.13801/j.cnki.fhclxb.201501.003
为了改善聚丙烯(PP)的耐电树枝性能,以有机化蒙脱土(MMT)作为纳米填充相,马来酸酐接枝聚丙烯(PP-g-MAH)作为相容剂,采用熔融插层一步法和二步法制备了MMT/PP复合材料.分别利用偏光显微镜(PLM)及差示扫描量热(DSC)曲线观测了PP及MMT/PP复合材料的结晶形态及结晶过程,采用SEM考察了MMT在复合材料中的分散状态.通过电树枝引发实验,探究了制备方法及结晶形态对复合材料耐电树枝化性能的影响.实验结果表明:采用熔融插层二步法制备的MMT/PP复合材料,其无机相分散较均匀,结晶尺寸减小,结晶结构由球晶转变为片晶的堆叠,结晶度提高了约2.7％;在PP试样中,电树枝长度较长且分枝较少,而MMT/PP试样中电树枝转变为长度较小且分枝较多的稠密结构.
关键词:
蒙脱土
,
聚丙烯
,
复合材料
,
二步熔融插层法
,
结晶形态
,
等温结晶过程
,
耐电树枝化特性
LIU Yongkun Southwestern Institute of Technology and Engineering
,
Chongqing
,
ChinaYANG Shihao Shandong Polytechnical University
,
Jinan
,
China
金属学报(英文版)
Using liquid quenching technique,the change of growth mode of graphite in cast iron melt was analysed.Based on the interface structure theory of crystal growth,the concept of multiplication of spiral growth steps was advanced and two basic multiplication models were given.It was proposed that multiplication of spiral steps is responsible for the change of growth mode of graphite in cast iron melt.The modifying elements such as Ce promote multiplication of spiral steps,which is regarded as the core of modification.Origination of screw dislocation and branch of the sector blocks in radius direction,both of which are essential to spheroidization of graphite in the melt,are caused by multiplication of spiral steps:and so is thickening of graphite plates.
关键词:
graphite
,
null
,
null
,
null
,
null
