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Investigation on terpolymer of ethylene/propylene/ω-bromo-α-olefins catalyzed by titanium complexes

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Abstract

Polyolefins with polar groups exhibited many applications as high-performance materials have been the subject of considerable research. In this study, terpolymers of ω-bromo-α-olefins with ethylene and propylene were synthesized in the presence of three multi-chelated non-metallocene titanium complexes. The structure and properties of the terpolymers were determined by 1H NMR, 13C NMR, Fourier transform infrared, differential scanning calorimetry after treatment by successive self-nucleating and annealing and wide-angle X-ray diffractograms. Furthermore, the stress–strain behaviors of the terpolymers were measured with ASTMD1708 microtensile, and the specimens were from the obtained terpolymer films. The results indicated that these catalysts were efficient for the terpolymerization. The catalytic activity was as high as 6.21 × 105 gP (molTi)−1 h−1 for terpolymerization of 11-bromo-1-undecylene with ethylene and propylene. The insertion ratio of 11-bromo-1-undecylene was up to 2.49 mol% confirmed by 1H NMR and 13C NMR. As for the terpolymers, their melting points decreased and their plasticity became weak with the incorporation of ω-bromo-α-olefins increasing. GPC results showed that the terpolymers had high weight-average molecular weight up to 2.51 × 105 g mol−1. Molecular weight distribution of the terpolymers was about 2, implying single-site mechanism for the terpolymerization, but slightly broader than that of ethylene/propylene copolymer.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21174011 and U1462102). The authors thank the Analysis and Test Center, Beijing University of Chemical Technology for use of DSC, FTIR, NMR, EI-MS, EA, WAXD, and INSTRON facilities.

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Authors and Affiliations

  1. State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, the College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Jing Wang, Lei He, Feng Nan, Fan Wang, Hongming Li, Ming Lei, Longfei Li, Qigu Huang & Wantai Yang

  2. Liaoyang Petrochemical Corporation, China National Petroleum Corporation, Liaoyang, 111003, China

    Jingjiang Wang & Dong Liu

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  1. Jing Wang
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  2. Lei He
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Correspondence to Qigu Huang.

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Wang, J., He, L., Nan, F. et al. Investigation on terpolymer of ethylene/propylene/ω-bromo-α-olefins catalyzed by titanium complexes. J Mater Sci 52, 5981–5991 (2017). https://doi.org/10.1007/s10853-017-0834-y

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