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

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

Received Date: 2 September 1985

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,Tc,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.
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