β晶型成核剂改性小本体法无规共聚聚丙烯研究  

Study on Batch Bulk Polymerized Random Propylene Copolymer Modified by β Nucleator

作　　者：窦强[1] 

机构地区：[1]南京工业大学材料科学与工程学院高分子系,江苏南京210009

出　　处：《中国塑料》2007年第6期79-82,共4页China Plastics

摘　　要：研究了β晶型成核剂（庚二酸钙）用量对小本体法无规共聚聚丙烯（PP—R）力学性能和结晶行为的影响。β晶型成核剂使小本体法PP—R的断裂伸长率有所下降，弯曲模量有所提高，拉伸强度变化不大，缺口冲击强度提高，特别是低温（0℃）缺口冲击强度得到较大改善。广角X射线衍射分析表明β成核剂不仅促进了小本体法PP—R中β晶型的生成，而且提高了γ晶型的相对含量。示差扫描量热分析也表明β成核剂改性小本体法PP—R中同时存在α、β和丫三种晶型。偏光显微镜观察发现β成核剂改性小本体法PP—R中出现了β晶型，晶体尺寸明显减小。The influence of β nucleating agent （calcium pimelate） on the mechanical properties and crystallization behavior of random propylene copolymer （PP-R） polymerized in bulk batch was studied. By using calcium pimelate, the elongation at break decreased a little, the flexural modulus increased a little, the notched impact strength obviously increased, especially at low temperature （0 ℃ ）. Wide angle Xray diffraction showed that not only β form generated, but also the amount of γ form generated increased in PP-R. Differential scanning calorimetry revealed that α, β and γ crystalline form coexisted. Polarizing microscope exhibited that γ crystal size decreased obviously by the addition of calcium pimelate.

关 键 词：无规共聚聚丙烯 Β晶型成核剂 小本体法 结晶 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]