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Citation: Yang Yuhua, Yu Fusheng, Xu Guanfan. DYNAMIC MECHANICAL PROPERTIES OF Ln-PBI[J]. Chinese Journal of Applied Chemistry, ;1987, 4(4): 69-70. shu

DYNAMIC MECHANICAL PROPERTIES OF Ln-PBI

1.
Changchun Institute of Applied Chemistry, Acadmia Sinica

Corresponding author: Yang Yuhua,
Received Date: 17 June 1986
Available Online: 19 November 1986

The dynamic mechanical properties of butadiene isoprene copolymer prepared with lanthanide catalysts (Ln-PBI) have been studied using torsinal pendulum method. The content of cis-unit in Ln-FBI is high. The glass transition temperatures accord with those calculated from the FOX law for random copolymers. When the butadiene content in Ln-PBI is higher than 80wt% a new T_X transition was observed over the temperture range from 233K to 243K. The results of ¹³C-NMR and X-ray diffraction spectra indicated that both the length of butadiene segments and the crystallinity increase with increase of butadiene content when the later is above 80% in the copolymers. The existense of the T_X transition is related to the crystalization of long segments of butadiene in Ln-PBI.
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