Toughness of glassy-semicrystalline multiblock copolymers

Alhad Phatak; Lisa S. Lim; Cletis K. Reaves; Frank S. Bates

doi:10.1021/ma0611319

Toughness of glassy-semicrystalline multiblock copolymers

Alhad Phatak, Lisa S. Lim, Cletis K. Reaves, Frank S. Bates

Chemical Engineering and Materials Science

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41 Scopus citations

Abstract

We report a study on the mechanical properties of lamellae-forming glassy-semicrystalline block copolymers composed of poly(cyclohexylethylene) (C) and polyethylene (E). Tensile properties of polydomain CEC, ECEC, CECEC, and ECECE block copolymers, and blends of these materials, reveal a critical dependence on the connectivity of the semicrystalline E blocks. A molecular parameter directly related to the fraction of bridging E blocks is identified, which captures the fracture behavior of C/E block copolymers over a range of chain architectures. Tensile testing and small-angle X-ray scattering (SAXS) experiments on aligned block copolymers reveal the role of bridging in the glassy C block and further elucidate the mechanisms that govern the deformation of microphase-separated lamellar domains and macroscopic fracture in glassy-semicrystalline block copolymers.

Original language	English (US)
Pages (from-to)	6221-6228
Number of pages	8
Journal	Macromolecules
Volume	39
Issue number	18
DOIs	https://doi.org/10.1021/ma0611319
State	Published - Sep 5 2006

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AB - We report a study on the mechanical properties of lamellae-forming glassy-semicrystalline block copolymers composed of poly(cyclohexylethylene) (C) and polyethylene (E). Tensile properties of polydomain CEC, ECEC, CECEC, and ECECE block copolymers, and blends of these materials, reveal a critical dependence on the connectivity of the semicrystalline E blocks. A molecular parameter directly related to the fraction of bridging E blocks is identified, which captures the fracture behavior of C/E block copolymers over a range of chain architectures. Tensile testing and small-angle X-ray scattering (SAXS) experiments on aligned block copolymers reveal the role of bridging in the glassy C block and further elucidate the mechanisms that govern the deformation of microphase-separated lamellar domains and macroscopic fracture in glassy-semicrystalline block copolymers.

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Toughness of glassy-semicrystalline multiblock copolymers

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