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本文用(体)热膨胀计法研究了共聚物组成、催化体系对乙丙共聚物结晶速率的影响。结果表明,同一催化体系乙丙共聚物的最大结晶速率(1/t_((1/2)(max)))随共聚物中乙烯含量的增加而增大。不同催化体系对二元乙丙共聚物的1/t_((1/2)(max))次序为:VOCl_3~->V_(5-9~-)>V_((aca?)3~-)。加入活化剂ETCA的各催化体系的二元乙丙共聚物的1/t_((1/2)(max))为VOCl_3~-ETCA>V_(5-9~-)ETCA>V_((ocac)~-)ETCA。结合结晶度、T_g、以及不同序列分布共聚物组成的测定,可推测VOCl_3~-体系乙丙共聚物具有较长的聚乙烯序列结构,V_(5-9~-)体系次之,V_((acac)_3~-)体系的乙丙共聚物分子链有更多的无规结构。
In this paper, the thermal expansion method was used to study the influence of the copolymer composition and the catalytic system on the crystallization rate of ethylene-propylene copolymer. The results show that the maximum crystallization rate (1 / t _ ((1/2))) of the same catalyst system increases with the ethylene content in the copolymer. The order of 1 / t_ ((1/2) (max)) of different catalyst system to ethylene-propylene copolymer is: VOCl_3 ~ -> V_5_9 ~ -> V_Aac3 ~ . 1 / t_ ((1/2) (max)) of the ethylene-propylene copolymers of each catalytic system added with the activator ETCA is VOCl_3 ~ -ETCA> V_ (5-9 ~ -) ETCA> ~ -) ETCA. According to the determination of crystallinity, T_g, and the composition of copolymers with different sequence distributions, it can be inferred that the ethylene-propylene copolymer has long polyethylene sequence structure, V_ (5-9 ~) system followed by V_ ( acac) _3 ~ -) system of ethylene-propylene copolymer molecular chains have more random structure.