摘要
利用正硅酸乙酯、硬脂酸和邻苯二甲酸钙制备了新型成核剂SLG1和SLG2。利用热重分析(TG)考察了成核剂的热稳定性,采用X射线衍射分析(XRD)和偏光显微镜(PLM)对其改性聚丙烯(PP)的晶体形态进行了表征,采用差示扫描量热法(DSC)研究了其结晶行为,并测试了PP的力学性能。结果表明,成核剂SLG1和SLG2能够诱导β-PP的生成,使PP的结晶温度明显提高,并且加快了PP的结晶速率,但是降低了结晶度。成核剂使PP的晶粒明显细化,球晶之间的界面模糊。在SLG1和SLG2含量分别为0.15%和0.3%时,PP的冲击强度分别由9.43kJ/m2提高到了21.82kJ/m2和37.79kJ/m2。
Nucleators SLG1 and SLG2 were prepared from tetraethyl orthosilicate, stearie acid, and calcium phthalate. The thermal stability of SLG1 and SLG2 was studied with thermogravimetry （TG）. Their nucleation behavior in polypropylene was studied with X-ray diffraction, polarized optical microscopy, and differential scanning caloimetry. It showed both SLG1 and SLG2 induced polypropylene to crystallize into β form. The crystallization temperature and crystallization rate were increased, but degree of crystallinity was decreased. Upon adding the nucleators, the spherulites became smaller with interface blurred. While the addition of SLG1 and SLG2 were 0. 15 and 0. 3%, the impact strength of PP was increased from 9.43 kJ/m^2 to 21.82 kJ/m^2 and 37.79 kJ/m^2, respectively, while the tensile strength decreased slightly.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第7期81-84,共4页
China Plastics
关键词
聚丙烯
Β晶型
成核剂
结晶形态
polypropylene
β-crystal form
nucleating agent
crystal morphology
