Reactive Core-Shell Bottlebrush Copolymer as Highly Effective Additive for Epoxy Toughening

Junsoo Moon, Yoon Huh, Seonghwan Kim, Youngson Choe, Joona Bang

Research output: Contribution to journalArticlepeer-review

Abstract

Herein, we designed a core-shell structured bottlebrush copolymer (BBP), which is composed of rubbery poly(butyl acrylate) (PBA) core and an epoxy miscible/reactive poly(glycidyl methacrylate) (PGMA) shell, as an epoxy toughening agent. The PGMA shell allows BBP to be uniformly dispersed within the epoxy matrix and to react with the epoxy groups, while the rubbery PBA block simultaneously induced nanocavitation effect, leading to improvement of mechanical properties of the epoxy resin. The mechanical properties were measured by the adhesion performance test, and the tensile and fracture test using universal testing machine. When BBP additives were added to the epoxy resin, a significant improvement in the adhesion strength (2-fold increase) and fracture toughness (2-fold increase in KIc and 5-fold increase in GIc) compared to the neat epoxy was observed. In contrast, linear additives exhibited a decrease in adhesion strength and no improvement of fracture toughness over the neat epoxy. Such a difference in mechanical performance was investigated by comparing the morphologies and fracture surfaces of the epoxy resins containing linear and BBP additives, confirming that the nanocavitation effect and void formation play a key role in strengthening the BBP-modified epoxy resins.

Original languageEnglish
Pages (from-to)1626-1633
Number of pages8
JournalChinese Journal of Polymer Science (English Edition)
Volume39
Issue number12
DOIs
Publication statusPublished - 2021 Dec

Keywords

  • Additive
  • Adhesion
  • Bottlebrush polymer
  • Epoxy toughening
  • ROMP

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Organic Chemistry

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