A STUDY OF LOW-TEMPERATURE CRYSTALLIZATION BEHAVIOR THE cis-1,4 POLYBUTADIENE PREPARED WITH RARE-
EARTH CATALYST SYSTEM*

ZHANG Hongfang; MO Zhishen Changchun

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A STUDY OF LOW-TEMPERATURE CRYSTALLIZATION BEHAVIOR THE cis-1,4 POLYBUTADIENE PREPARED WITH RARE- EARTH CATALYST SYSTEM*

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- A STUDY OF LOW-TEMPERATURE CRYSTALLIZATION BEHAVIOR THE cis-1,4 POLYBUTADIENE PREPARED WITH RARE- EARTH CATALYST SYSTEM*
- Vol. 4, Issue 3, Pages: 241-247(1986)
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- Published：20 September 1986
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ZHANG Hongfang, MO Zhishen Changchun. A STUDY OF LOW-TEMPERATURE CRYSTALLIZATION BEHAVIOR THE cis-1,4 POLYBUTADIENE PREPARED WITH RARE- EARTH CATALYST SYSTEM*[J]. 1986, 4(3): 241-247.
DOI：

ZHANG Hongfang, MO Zhishen Changchun. A STUDY OF LOW-TEMPERATURE CRYSTALLIZATION BEHAVIOR THE cis-1,4 POLYBUTADIENE PREPARED WITH RARE- EARTH CATALYST SYSTEM*[J]. 1986, 4(3): 241-247. DOI：

摘要

The effects of molecular weight and temperature on crystallization processes at low tempera-ture for cis-1

4 polybutadiene prepared with rare-earth catalyst (Ln-PB) have been studied by WAXDmethod. In the range of molecular weight from(Mn)=2.13×105 to 46.8× 105

there are a maximum of crystallization rate at (Mn)≈29× 105 and a minimum at (Mn)≈8×105.The temperature related to maximum crystallization rate

max is observed to be between -60℃ and -70℃.The degree of equilibrium crystallinity of Ln-PB is independent of molecular weight at (Mn) greater than 104

also the linearity is shown between the correspondent temperature

degree of equilibrium crystallinity and molecular weight.Values of unit cell parameters of Ln-PB increase with temperature.The main crystallization of Ln-PB belongs to heterogeneous nucleation.The crystallization processes are mixed growth one and two dimensions.

Abstract

The effects of molecular weight and temperature on crystallization processes at low tempera-ture for cis-1

4 polybutadiene prepared with rare-earth catalyst (Ln-PB) have been studied by WAXDmethod. In the range of molecular weight from(Mn)=2.13×105 to 46.8× 105

there are a maximum of crystallization rate at (Mn)≈29× 105 and a minimum at (Mn)≈8×105.The temperature related to maximum crystallization rate

max is observed to be between -60℃ and -70℃.The degree of equilibrium crystallinity of Ln-PB is independent of molecular weight at (Mn) greater than 104

also the linearity is shown between the correspondent temperature

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