| STIRRING INDUCED SOLUTION CRYSTALLIZATION OF cis-1,4-POLYBUTADIENE |
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| 引用本文： | 徐洋,周恩乐,余赋生,钱保功. STIRRING INDUCED SOLUTION CRYSTALLIZATION OF cis-1,4-POLYBUTADIENE[J]. 高分子科学, 1988, 0(2): 152-158 |
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| 作者姓名： | 徐洋 周恩乐 余赋生 钱保功 |
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| 作者单位： | Changchun Institute of Applied Chemistry Academia Sinica，Changchun，Changchun Institute of Applied Chemistry Academia Sinica，Changchun，Changchun Institute of Applied Chemistry Academia Sinica，Changchun，Changchun Institute of Applied Chemistry Academia Sinica，Changchun |
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| 摘 要： | 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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| 收稿时间： | 1987-02-23 |
STIRRING INDUCED SOLUTION CRYSTALLIZATION OF cis-1,4-POLYBUTADIENE |
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| XU Yang,Zhou Enle,YU Fusheng,QIAN Baogong. STIRRING INDUCED SOLUTION CRYSTALLIZATION OF cis-1,4-POLYBUTADIENE[J]. Chinese Journal of Polymer Science, 1988, 0(2): 152-158 |
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| Authors: | XU Yang Zhou Enle YU Fusheng QIAN Baogong |
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| Affiliation: | Changchun Institute of Applied Chemistry Academia Sinica; Changchun |
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| Abstract: | 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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| Keywords: | Cis-1 4-Polybutadiene Stirring induced crystallization Morphology of polymers Electron microscopy. |
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