庚二酸/硬脂酸钙双组分成核剂对β晶型等规聚丙烯生成的影响  

Effect of the Bicomponent Nucleator of Pimelic Acid/Calcium Stearate on the Formation of β Crystal Form Isotactic Polypropylene

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：《高分子材料科学与工程》2008年第9期76-79,共4页Polymer Materials Science & Engineering

摘　　要：研究了在120℃等温结晶30min的条件下，庚二酸／硬脂酸钙组成比对等规聚丙烯中β晶型含量的影响，发现在0．15％（质量分数）庚二酸用量下，随着硬脂酸钙用量的增加，β晶型含量不断增大，硬脂酸钙用量在0．35％（质量分数）以上时，才能生成较高纯度的β晶型聚丙烯，说明iPP和双组分成核剂熔体混合时，庚二酸和硬脂酸钙可能“就地”发生化学反应，生成高效13晶型成核剂——庚二酸钙。还研究了在0．15％庚二酸／10．5％硬脂酸钙固定组成比下，等温结晶温度（100℃～140℃）对iPP中β晶型含量的影响，发现在130℃～140℃之间发生β→α晶型转变。The influence of the composition ratio of pimelic acid/calcium stearate on the β crystal form content of isotactic polypropylene had been studied at the crystallization temperature of 120 ℃ and duration of 30 min. It is found that the β crystal form content increases continuously with increasing amount of calcium stearate at the constant amount of 0.15% pimelic acid. It shows that pimelic acid and calcium stearate may react to produce a high effective β nucleator-calcium pimelate ＂in situ＂ during the melt mixing. The influence of crystallization temperatures （ 100 ℃ - 140 ℃ ） on the β crystal form content of isotactic polypropylene had also been studied at the constant composition ratio of 0.15 % pimelic acid/0. 5% calcium stearate. It shows that β→α crystal form transformation occurres between 130 ℃ and 140 ℃.

关 键 词：聚丙烯 Β晶型 成核剂 庚二酸 结晶 硬脂酸钙 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]