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Modification and thermal properties of syndiotactic-1,2-polybutadiene

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Abstract

Side chain of syndiotactic-1,2-polybutadiene (SPBU) has been modified by means of hydrogenation, hydrosilylation with trialkylsilane compounds, or thiol–ene reaction with alkyl thiol compounds. Crystallization temperature (Tc) of the resulting polymers, which was detected on the cooling process from melting state, decreased with increasing the modification ratio. The molecular bulkiness of the compounds affected the degree of the Tc depression with increasing the modification ratio. The modification of SPBU with triphenyl silane increased glass transition temperature of the polymers. Isothermally crystallized SPBU samples modified by butane thiol (BT) showed two melting peaks derived from first crystallization (Tm1, higher temperature) and second crystallization (Tm2, lower temperature). The Tm1 decreased with increasing the modification ratio, whereas the Tm2 was almost independent of the modification ratio. The equilibrium melting temperatures of the Tm1s of the SPBU samples modified by BT were decreased with increasing the modification ratio. By contrast, the modification ratio did not affect the equilibrium melting temperatures of the Tm2s. Slopes in Hoffman–Week’s plot the modified SPBU samples indicated that Tm1 and Tm2 were originated from lamellar crystal and fringed micelle, respectively.

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Authors and Affiliations

  1. Department of Applied Chemistry, Materials Science Course, College of Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo, 135-8548, Japan

    Naofumi Naga, Shigenori Ishinoda, Hiroki Ishiguro & Gaku Ishikawa

  2. Instrumentation Analysis Center, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo, 184-8588, Japan

    Keiichi Noguchi

Authors
  1. Naofumi Naga
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  2. Shigenori Ishinoda
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  3. Hiroki Ishiguro
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  4. Gaku Ishikawa
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Correspondence to Naofumi Naga.

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Naga, N., Ishinoda, S., Ishiguro, H. et al. Modification and thermal properties of syndiotactic-1,2-polybutadiene. Polym. Bull. 76, 241–257 (2019). https://doi.org/10.1007/s00289-018-2380-4

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  • DOI: https://doi.org/10.1007/s00289-018-2380-4

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