摘要
研究了成核剂 1 ,3∶ 2 ,4-对二乙基苄叉山梨醇 (EDBS)对聚丙烯及其乙烯共聚物的结晶行为和结晶形态的影响 ,并对其薄膜进行了光学性能的表征 .结果表明 ,添加少量 (质量分数 0 .5 % )的成核剂 ,使聚丙烯样品的结晶温度大大提高 ,结晶度明显增加 .而对于乙烯共聚聚丙烯样品 ,添加少量 (质量分数 0 .5 % )成核剂 ,不仅使其整体结晶温度大大提高 ,结晶度增加 ,而且明显强化了低有序部分的结晶 .少量成核剂的加入 ,使聚丙烯及其共聚物的球晶尺寸明显缩小 。
The influences of nucleating agent EDBS on crystallization behavior and properties of polypropylene(iPP) and its copolymer with a small amount(4.48%, molar fraction) of ethylene(CPP) were studied. DSC results indicated that the crystallization temperature of iPP and CPP samples with 0.5%(mass fraction) EDBS obviously increased and the degree of crystallinity of these samples became higher.In addition, adding small amount of EDBS enhanced the crystallization of the low isotacticity and low molecular weight segments of the CPP. PLM results showed that their spherulite size decreased markedly, and as a result, the transmittance and haze of the films were all improved.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第8期1610-1613,共4页
Chemical Journal of Chinese Universities
基金
国家重点基础研究发展规划项目 (批准号 :G19990 64 80 5 )资助
关键词
共聚物
性能
成核剂
聚丙烯
结晶行为
结晶形态
Nucleating agent
Polypropylene
Crystallization behavior
Crystal morphology
