摘要
采用偏光显微镜（PLM）、差示扫描量热仪（DSC）、广角X射线衍射仪（WAXD）等研究了一种稀土类β成核剂WBG对等规聚丙烯（iPP）性能的影响。结果表明，加入WBG可诱导PP中β晶型的生成。当WBG加入量为0．2%时，β晶型的含量可达57％。加入少量WBG，均聚聚丙烯悬臂梁冲击强度提高1．48倍，热变形温度提高11-31℃。在制品成型过程中，较慢的冷却速率有利于β晶的生成和完善。制品成型后，后期热处理有利于试样综合性能进一步提高，最佳处理温度为100℃。PLM发现了一种新现象：中心β晶呈树叶状生长，当晶体长到一定尺寸后，中心外缘附生β球晶，β球晶之间形成比纯PP小且不规则的界面，部分中心β晶相互贯穿。
Effect of a rare earth β-nucleating agent（WBG）on the properties of isotactic polypropylene （iPP） was studied by polarizing microscope（PLM）, differential scanning calorimetry（IX S C）, and wideangular X-ray diffraction（WAXD）. The results showed that the addition of small amounts of WBG to PP induced the proportion of β crystals. The relative content of β-phase was up to 57 % in a PP containing 0.2 96 of the WBG. The Izod impact strength of homopolymerization PP was increased 1.48 times, and heat deflection temperature rose 11 -- 33 ℃, when small amounts of WI3G was added. The samples showed the optimal properties when the heat treatment at 100 ℃. A slow cooling rate benefited the formation and perfect of β crystals. The photos of PLM showed a new phenomenon that β crystals grew up with leaflike form in the center and covered with β-spherulites which formed some small and anomalistic interface , some central β crystals impenetrate each other.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第1期81-85,共5页
China Plastics
关键词
稀土
成核剂
Β晶型
聚丙烯
热处理
rare earth
nucleating agent
β crystallite
isotactic polypropylene
heat treatment
