Citation: XU Yang, Zhou Enle, YU Fusheng, QIAN Baogong. STIRRING INDUCED SOLUTION CRYSTALLIZATION OF cis-1,4-POLYBUTADIENE[J]. Chinese Journal of Polymer Science, ;1988, 6(2): 152-158. shu

STIRRING INDUCED SOLUTION CRYSTALLIZATION OF cis-1,4-POLYBUTADIENE

Received Date: 23 February 1987

In this work, the stirring induced solution crystallization behaviour of cis-1, 4-polybutadiene polymerized with rare-earth catalyst (Ln-PB) has been studied by electron microscope, DSC and GPC. It has been found that when 0.5% Ln-PB toluene solution was stirred at a temperature within the range of-15° to-79℃ with a speed of 180 rpm, a kind of white swollen thread-llke substance wound around the stirrer was formed. It was seen under electron microscope that this swollen thread-Like substance consisted of fibrillar crystals of Ln-Pb parallel to each other.The amount of Ln-Pb wound around the stirrer increased with the decrease in crystallization temperature until a maximum was reached at about-65℃,then it decreased with the decrease in crystallization temperature.However,the higher the crystallization temperature,the higher the average molecular weight and the narrower the molecular weight distribution of Ln-PB which wound around the stirrer.Therefore,Ln-PB sample may be fractionated by stirring its dilute solution at a series of crystallization temperatures.
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