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本工作研究了稀土顺-1,4-聚丁二烯(Ln-PB)的搅拌溶液结晶行为,发现当结晶温度为-15—-79℃、搅拌速度为180转/分时,经过一段时间,就有乳白色的丝状物缠绕在搅拌棒上.在电镜下可以看到,这些丝状物是由平行排列的纤维晶组成的.沉积在搅拌棒上的Ln-PB的量随结晶温度的下降而增加,大约在-65℃左右达到极大值.而后又随结晶温度的下降而减少.结晶温度愈高、沉积在搅拌棒上的Ln-PB的平均分子量愈高,分布愈窄,所以可利用搅拌溶液结晶的方法对Ln-PB进行分级.
This work studied the crystallization behavior of rare earth cis-1,4-polybutadiene (Ln-PB) stirred solution and found that when the crystallization temperature is -15--79 ℃ and stirring speed is 180 rpm, after a period of time , There are milky filaments wrapped around the stirring rod can be seen under the electron microscope, these filaments are composed of parallel arrangement of fiber crystals deposited on the stirring rod Ln-PB amount with the crystallization temperature Descends and reaches a maximum at about -65 ° C, and then decreases as the crystallization temperature decreases.The higher the crystallization temperature, the higher the average molecular weight of Ln-PB deposited on the stirrer bar, the narrower the distribution, Ln-PB can be fractionated using a method of crystallization of the stirred solution.