Higher order structures and toughening mechanisms for simultaneously polymerized polymethacrylate/polyurethane

Author:

Kuwashiro Shiho1ORCID,Hatanaka Yoshiro1,Tao Kousaku1,Higashi Seiji1,Kago Keitaro1,Hirano Hiroshi1,Kishi Hajime2ORCID

Affiliation:

1. Research Division of Materials Science and Engineering Osaka Research Institute of Industrial Science and Technology Morinomiya Center Osaka Japan

2. Graduate School of Engineering University of Hyogo Himeji Hyogo Japan

Abstract

AbstractAmorphous polymer/crystalline polymer blends can be prepared via the simultaneous polymerization of polymethacrylate/polyurethane combinations. The relationship between higher order structures and fracture mechanisms in these blends must be uncovered to elucidate the source of the increased fracture toughness of such materials. The present work involves the production of blended polymethacrylate/polyurethane and assess the internal structures of these specimens using optical and electron microscopy. These observations reveal the presence of both spherulites and elastomeric phases. The spherulites consisting of the polyurethane and are several micrometers in diameter whereas the phase‐separated polyurethane elastomeric domains are approximately 100 nm in size. Multiple cracks, crack bridging and plastic deformation around the precrack tips of loaded specimens are evidently responsible for the increased toughness of these blends. The former two phenomena are attributed to the presence of spherulites while the plastic deformation of the methacrylate matrix is ascribed to cavitation of the polyurethane elastomeric phases in response to loading.

Funder

Japan Society for the Promotion of Science

Publisher

Wiley

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