WAXD STUDIES ON LOW TEMPERATURE CRYSTALLIZATION BEHAVIOR OF THE CIS-1,4 POLYBUTADINE PREPARED WITH RARE-EARTH CATALYST SYSTEM

ZHANG Hong-fang; MO Zhi-shen; WEI Xue-jun; ZHANG Shu-xiang; Han Ping

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WAXD STUDIES ON LOW TEMPERATURE CRYSTALLIZATION BEHAVIOR OF THE CIS-1,4 POLYBUTADINE PREPARED WITH RARE-EARTH CATALYST SYSTEM

Research Article | 更新时间：2021-03-19

- WAXD STUDIES ON LOW TEMPERATURE CRYSTALLIZATION BEHAVIOR OF THE CIS-1,4 POLYBUTADINE PREPARED WITH RARE-EARTH CATALYST SYSTEM
- Acta Polymerica Sinica Issue 6, Pages: 416-421(1988)
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- Published：20 December 1988，
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ZHANG Hong-fang, MO Zhi-shen, WEI Xue-jun, ZHANG Shu-xiang, Han Ping. WAXD STUDIES ON LOW TEMPERATURE CRYSTALLIZATION BEHAVIOR OF THE CIS-1,4 POLYBUTADINE PREPARED WITH RARE-EARTH CATALYST SYSTEM. [J]. Acta Polymerica Sinica (6):416-421(1988)
DOI：

ZHANG Hong-fang, MO Zhi-shen, WEI Xue-jun, ZHANG Shu-xiang, Han Ping. WAXD STUDIES ON LOW TEMPERATURE CRYSTALLIZATION BEHAVIOR OF THE CIS-1,4 POLYBUTADINE PREPARED WITH RARE-EARTH CATALYST SYSTEM. [J]. Acta Polymerica Sinica (6):416-421(1988) DOI：

摘要

本文用广角X-射线衍射法(WAXD)研究了稀土催化聚合顺-1

4-聚丁二烯(Ln-PB)低温下分子量和温度对结晶过程的影响.随着分子量的改变

结晶速度在Mη=8×105左右有一极小值;在Mη=29×105左右有一极大值.最大结晶速度发生在Tc

max=-60～-70℃之间.最大平衡结晶度值

在Mη大于106以上与分子量无关

而最大平衡结晶度值所对应的温度与Mη呈线性关系.随着温度上升

晶胞参数略有增大.Ln-PB主级结晶属于非均相成核

以原纤状和盘状混合生长.

Abstract

The effects of molecular weight and temperature on crystallization processes at low temperature for cis-l

4-polybutadine prepared with rare-earth catalyst (Ln-PB) have been studied by WAXD method. In the range of molecular weight from Mη≈2.13×105 to 46.8×105 there are a maximum of crystallization rate at Mη≈29 × 105 and a minimum at Mη≈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 mo-lecular weight at Mn greater than 106

also the linearity is shown between the correspondent remperature

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

关键词

广角X-射线衍射结晶速率非均相成核平衡结晶度聚丁二烯

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