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用含稀土Nd化合物的钛系高效催化剂SN—1进行苯乙烯的定向聚合可以得到等规聚苯乙烯。聚合产物经沸腾丁酮萃取分离去无规聚合物后,经红外光谱、X—射线衍射、DSC及反气相色谱等方法证明是结晶性的等规聚苯乙烯。其结晶度在65～75％之间。本文应用透射电镜观察不同结晶条件下等规聚苯乙烯的结晶形态。用0.5％的氯苯溶液在130℃的甘油表面成膜,再经过不同温度和时间的真空恒温结晶,然后用Hu—12A和JEM—100CXⅡ透射电镜观察及照像。实验结果表明:结晶温度和结晶时间对等规聚苯乙烯的结晶形态有重要影响。在室温下放置60天的样品膜中
The isotactic polystyrene can be obtained by the directional polymerization of styrene with a titanium-based high-efficiency catalyst SN-1 containing a rare earth Nd compound. After the polymerization product was extracted by boiling butanone, the random polymer was separated and confirmed to be crystalline isotactic polystyrene by infrared spectroscopy, X-ray diffraction, DSC and gas chromatography. Its crystallinity is between 65 ~ 75%. In this paper, the transmission electron microscope was used to observe the crystalline morphology of the isotactic polystyrene under different crystallization conditions. With 0.5% chlorobenzene solution at 130 ℃ glycerol surface filming, and then through different temperature and time vacuum thermostat crystallization, and then with Hu-12A and JEM-100CX Ⅱ transmission electron microscope observation and imaging. The experimental results show that the crystallization temperature and crystallization time have an important influence on the crystalline morphology of isotactic polystyrene. Placed in a sample membrane at room temperature for 60 days