The terpolymer of neodymium-catalyzed styrene, isoprene, and butadiene: Efficient synthesis of integral rubber containing atactic styrene–styrene sequences and high Cis-1,4 polyconjugated olefins

Authors

  • Qiang Xu,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Li Li,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Fang Guo,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Zhenghai Shi,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Hongwei Ma,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Yanshai Wang,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Yurong Wang,

    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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  • Yang Li

    Corresponding author
    1. Department of Polymer Science and Engineering, State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China
    2. Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, Liaoning, China
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Abstract

The present study focuses on the terpolymer of styrene (St), isoprene (Ip), and butadiene (Bd) synthesized together in cyclohexane at 70°C with neodymium (Nd) compound, alkylaluminum, and chlorinating agent (Cl) rare earth cocatalyst system. The resultants possessed atactic St–St sequences and high cis-1,4 polyconjugated olefins in macromolecular chains besides controllable composition. The composition of the St–Ip–Bd terpolymers and molecular weight (Mw), molecular weight distribution (Mw/Mn) were controlled through the adjustment of Nd compound, alkylalumium, monomers feed ratio (St/Ip/Bd), and [Nd]/[monomers]. With the inventory rating of St raised from 15% to 55%, the content of St in the terpolymers got increased from 2% to 15%. And the content of the Ip segments and Bd segments in the terpolymers increased from 33% to 56% and from 28% to 54%, respectively, with the proportion of Ip/Bd varied from 1/2 to 2/1. As the [Nd]/[monomers] varied from 1.0 × 10−3 to 5.0 × 10−4, the molecular weight increased from 1.3 × 104 to 2.7 × 104. According to the proton nuclear magnetic resonance (1H-NMR) and 13C-NMR, it was proved that both microstructures of polybutadiene segments and polyisoprene segments were high cis-1,4-configuration. A single glass-transition temperature was observed in the differential scanning calorimetry curve. POLYM. ENG. SCI., 54:1858–1863, 2014. © 2013 Society of Plastics Engineers

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