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Development of a supramolecular accelerator simultaneously to increase the cross-linking density and ductility of an epoxy resin

Authors
Seo, JiaeYui, NobuhikoSeo, Ji-Hun
Issue Date
15-1월-2019
Publisher
ELSEVIER SCIENCE SA
Keywords
Polyrotaxane; Accelerator; Cross-linker; Epoxy resin; Ductility
Citation
CHEMICAL ENGINEERING JOURNAL, v.356, pp.303 - 311
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING JOURNAL
Volume
356
Start Page
303
End Page
311
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/68292
DOI
10.1016/j.cej.2018.09.020
ISSN
1385-8947
Abstract
The development of a novel accelerator capable of simultaneously enhancing the cross-linking density and ductility of an epoxy resin without sacrificing the reaction rate is reported. The basic concept comprises the synthesis of a tertiary amine-functionalized polyrotaxane (PRX_NR1) accelerator: a molecular necklace structure that induces a high cross-linking density as well as active molecular movement. Fourier transform infrared spectroscopy and differential scanning calorimetry measurements confirmed that the PRX_NR1-containing epoxy resin afforded a high reaction rate. Furthermore, the cross-linking density and mechanical properties of the epoxy resin were confirmed by dynamic mechanical analysis and tensile testing. Consequently, the PRX_NR1-containing epoxy resin greatly increased the cross-linking density, thereby resulting in an increase in tensile strength and glass transition temperature. Interestingly, the epoxy resin exhibited a simultaneous increase in ductility which is important to avoid brittle fracture (low toughness) of the epoxy resins. These results indicate that the proposed molecular necklace-like supramolecular PRX_NR1 accelerator is highly effective to overcome the traditional drawbacks of an epoxy resin that pose significant problems in the industrial field.
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