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Open AccessArticle

Resistance to Cleavage of Core–Shell Rubber/Epoxy Composite Foam Adhesive under Impact Wedge–Peel Condition for Automobile Structural Adhesive

1
Laboratory of Adhesion and Bio-Composites, Program in Environmental Materials Science, College of Agriculture and Life Science, Seoul National University, Seoul 08826, Korea
2
Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
3
Unitech Co., Ltd., Byeolmang-ro 459beon-gil 45, Gyeonggi-do 15598, Korea
4
Kukdo Chemical Co., Ltd., Gasandigital 2-ro, Seoul 08588, Korea
5
Korea Research Institute of Chemical Technology, 141 Gajeongro, Daejeon 34114, Korea
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(1), 152; https://doi.org/10.3390/polym11010152
Received: 17 December 2018 / Revised: 14 January 2019 / Accepted: 14 January 2019 / Published: 17 January 2019
(This article belongs to the Special Issue Polymeric Foams)
Epoxy foam adhesives are widely used for weight reduction, watertight property, and mechanical reinforcement effects. However, epoxy foam adhesives have poor impact resistance at higher expansion ratios. Hence, we prepared an epoxy composite foam adhesive with core–shell rubber (CSR) particles to improve the impact resistance and applied it to automotive structural adhesives. The curing behavior and pore structure were characterized by differential scanning calorimetry (DSC) and X-ray computed tomography (CT), respectively, and impact wedge–peel tests were conducted to quantitatively evaluate the resistance to cleavage of the CSR/epoxy composite foam adhesives under impact. At 5 and 10 phr CSR contents, the pore size and expansion ratio increased sufficiently due to the decrease in curing rate. However, at 20 phr CSR content, the pore size decreased, which might be due to the steric hindrance effect of the CSR particles. Notably, at 0 and 0.1 phr foaming agent contents, the resistance to cleavage of the adhesives under the impact wedge–peel condition significantly improved with increasing CSR content. Thus, the CSR/epoxy composite foam adhesive containing 0.1 phr foaming agent and 20 phr CSR particles showed high impact resistance (EC = 34,000 mJ/cm2) and sufficient expansion ratio (~148%). View Full-Text
Keywords: epoxy composite foam adhesive; core–shell rubber; impact wedge–peel test; automobile structural adhesives epoxy composite foam adhesive; core–shell rubber; impact wedge–peel test; automobile structural adhesives
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MDPI and ACS Style

Back, J.-H.; Baek, D.; Shin, J.-H.; Jang, S.-W.; Kim, H.-J.; Kim, J.-H.; Song, H.-K.; Hwang, J.-W.; Yoo, M.-J. Resistance to Cleavage of Core–Shell Rubber/Epoxy Composite Foam Adhesive under Impact Wedge–Peel Condition for Automobile Structural Adhesive. Polymers 2019, 11, 152.

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