Molecular Aggregation States and Physical Properties of Syndiotactic Polystyrene/Hydrogenated Polyisoprene Multiblock Copolymers with Crystalline Hard Domain

Yuji Higaki, Ken Suzuki, Yudai Kiyoshima, Tomoyuki Toda, Masayoshi Nishiura, Noboru Ohta, Hiroyasu Masunaga, Zhaomin Hou, Atsushi Takahara

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Molecular aggregation structure and mechanical as well as thermal properties of novel well-defined multiblock copolymers consisting of crystalline syndiotactic polystyrene (sPS) and rubbery hydrogenated polyisoprene (hPIp) were investigated. The morphology and crystalline ordered structure of the multiblock copolymer films prepared by solvent casting from 1,2-dichlorobenzene solution depended on the volume fraction of sPS (VFsPS) and number of blocks. The multiblock copolymer films exhibited ordered morphology with low crystallinity. The crystallinity of the sPS reduced with decreasing the VFsPS. The pentablock copolymer produced more ordered morphology and less crystallinity than the triblock copolymers. The anisotropic orientation and mechanical stability of the δ form sPS crystals in the spherical sPS domains during uniaxial stretching were demonstrated. Tensile testing and dynamic mechanical analysis indicated that these multiblock copolymer films with appropriate sPS fraction are strong, tough, and elastic and thus could be potential candidates for a new type of thermoplastic elastomer with discrete crystalline hard domains.

Original languageEnglish
Pages (from-to)6184-6191
Number of pages8
JournalMacromolecules
Volume50
Issue number16
DOIs
Publication statusPublished - Aug 22 2017

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Polyisoprenes
Polystyrenes
Agglomeration
Copolymers
Physical properties
Crystalline materials
Volume fraction
Thermoplastic elastomers
Mechanical stability
Tensile testing
Dynamic mechanical analysis
Crystal orientation
Block copolymers
Stretching
Casting
Thermodynamic properties
Crystals

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Molecular Aggregation States and Physical Properties of Syndiotactic Polystyrene/Hydrogenated Polyisoprene Multiblock Copolymers with Crystalline Hard Domain. / Higaki, Yuji; Suzuki, Ken; Kiyoshima, Yudai; Toda, Tomoyuki; Nishiura, Masayoshi; Ohta, Noboru; Masunaga, Hiroyasu; Hou, Zhaomin; Takahara, Atsushi.

In: Macromolecules, Vol. 50, No. 16, 22.08.2017, p. 6184-6191.

Research output: Contribution to journalArticle

Higaki, Yuji ; Suzuki, Ken ; Kiyoshima, Yudai ; Toda, Tomoyuki ; Nishiura, Masayoshi ; Ohta, Noboru ; Masunaga, Hiroyasu ; Hou, Zhaomin ; Takahara, Atsushi. / Molecular Aggregation States and Physical Properties of Syndiotactic Polystyrene/Hydrogenated Polyisoprene Multiblock Copolymers with Crystalline Hard Domain. In: Macromolecules. 2017 ; Vol. 50, No. 16. pp. 6184-6191.
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AB - Molecular aggregation structure and mechanical as well as thermal properties of novel well-defined multiblock copolymers consisting of crystalline syndiotactic polystyrene (sPS) and rubbery hydrogenated polyisoprene (hPIp) were investigated. The morphology and crystalline ordered structure of the multiblock copolymer films prepared by solvent casting from 1,2-dichlorobenzene solution depended on the volume fraction of sPS (VFsPS) and number of blocks. The multiblock copolymer films exhibited ordered morphology with low crystallinity. The crystallinity of the sPS reduced with decreasing the VFsPS. The pentablock copolymer produced more ordered morphology and less crystallinity than the triblock copolymers. The anisotropic orientation and mechanical stability of the δ form sPS crystals in the spherical sPS domains during uniaxial stretching were demonstrated. Tensile testing and dynamic mechanical analysis indicated that these multiblock copolymer films with appropriate sPS fraction are strong, tough, and elastic and thus could be potential candidates for a new type of thermoplastic elastomer with discrete crystalline hard domains.

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