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, 1988,(6):416-421.
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, 1988,(6):416-421.DOI:
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
Tc
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.