The effects of the toughening mechanism and the molecular weights between cross-links on the fatigue resistance of epoxy polymer blends

POLYMER

卷:223

Article

Kishi, Hajime¹  Matsuda, Satoshi¹  Imade, Jin¹  Shimoda, Yusuke¹  Nakagawa, Takateru¹  Furukawa, Yoshio² 

[1] Univ Hyogo, Grad Sch Engn, 2167 Shosha, Himeji, Hyogo 6712201, Japan

[2] KANEKA Corp, 1-8 Miyamae Machi, Takasago, Hyogo 6768688, Japan

关键词: Fatigue threshold;    Epoxy;    Toughening;    Polyamide-12;    Core-shell rubber;   

DOI  :  10.1016/j.polymer.2021.123712

来源: Elsevier

【 摘 要 】

The fatigue resistance of epoxy polymer blends incorporating different types of preformed polymer particles was evaluated in terms of fatigue threshold and fatigue crack propagation (FCP). The fatigue thresholds of epoxies modified with polyamide-12 (PA12) particles were associated with higher stress intensity factor ranges (?K) than those of pure epoxies, irrespective of the molecular weights between cross-links (Mc). In contrast, the fatigue thresholds of epoxy blends with core-shell rubber (CSR) particles were affected by Mc. The FCP curve for a highly crosslinked CSR-toughened epoxy with Mc of 1110 g/mol was located at higher ?K values compared with data for the corresponding pure epoxy. In contrast, the fatigue threshold of a moderately cross-linked CSR-modified epoxy with Mc of 2360 g/mol appeared in the lower ?K range relative to the pure epoxy. Both cavitation of the CSR particles and plastic deformation of the latter epoxy were localized in a narrow area.

【 授权许可】

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