Synthesis and characterization of trans-1,4-butadiene/isoprene copolymers: Determination of sequence distribution and thermal properties |
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Authors: | Xiu-bo Jiang Qing-fei Zhang Ai-hua He |
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Institution: | Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China |
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Abstract: | Two series of trans-1,4-poly(butadiene-co-isoprene) copolymers(TBIR) were prepared using the catalyst system Ti Cl4/Mg Cl2-Al(i-Bu)3 at different reaction temperatures. All dyad and triads sequence distributions, the number-average sequence length and the sequence concentration of the copolymers were calculated according to 13C-NMR spectra. The influences of temperature and initial molar ratio of butadiene to isoprene(Bd to Ip) on the distribution of the chain segments in the TBIR copolymers were discussed. The correlation of copolymer compositions and thermal properties were also evaluated, which facilitated the understanding of controlling the degree of crystallinity and the transition temperature by changing Bd content and temperature. |
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Keywords: | Trans-1 4- Isoprene Butadiene Copolymer Thermal properties |
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