摘要
通过磨盘碾磨制备了PP 石墨复合粉末 .用FT IR ,XRD和DSC表征了磨盘剪切力场作用下 ,PP 石墨体系中 ,聚丙烯结构与性能的变化 .结果表明 ,磨盘碾磨使PP有序结构破坏 ,分子链断裂并与石墨的表面官能团之间发生了固相力化学反应 ,导致其结晶度降低 (由 5 7 2 %降低到 2 6 4%) ,晶面间距增大 ( ( 0 1 0 )面由 0 62 3nm增加到 0 63 2nnm) ,晶粒尺寸减小 (由 1 2 83nm减小到 6 48nm) ,这些变化 ,在热压成型的非等温过程中部分得到恢复 ,且α 晶的 ( 0 40 )面生长有择优性 ,其XRD强度大大超过 ( 0 1 0 )面 ,微晶尺寸更大 .同时发现 ,在PP 石墨复合粉末和复合材料中 ,α 单斜晶部分地转化为γ 三斜晶 ,在PP 石墨复合材料中 ,γ 三斜晶占 3 4 8%.
The PP/graphite compounding powders were prepared by pan milling at ambient temperature.Under the strong shear in pan milling process,PP may react solid mechanochemically with graphite.The crystalline structure changes of PP in the PP/graphite system during pan milling were characterized by using FTIR,DSC and WAXD techniques.It was found that after pan milling the crystallinity of PP decreased from 57 2% to 26 4%,the crystallite size decrease and the distance between crystal faces slightly increased.These changes can be partially recovered during further molding or thermal treatment.The results showed the existence of some content of γ form crystals of PP in the PP/graphite composites after pan milling.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2003年第2期229-234,共6页
Acta Polymerica Sinica
基金
国家重点基础研究专项基金资助 (基金号G19990 64 80 9)
中法先进材料研究计划合作项目资助(项目号PRAMX0 0 0 8)