Degradation behavior of unsaturated polyester resin in alcohols

Authors: Hojo, H.¹; Ogasawara, K.²; Chang, W.L.³; Tsuda, K.⁴

Source: Advanced Composite Materials, Volume 3, Number 4, 1994 , pp. 341-353(13)

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Abstract:

Immersion tests of unsaturated polyester resin and FRP were conducted in various alcohols. The corrosion of the resin belonged to the 'penetration type', in which resin corrosion was initiated after the penetration of alcohol into the resin was finished. The initial degradation of the resin was controlled by a physical action, followed by a slow chemical degradation, i.e. corrosion. Higher temperature and higher concentration of the solutions promoted degradation. Lower molecular alcohols produced more severe corrosion by transesterification under neutral condition without an acidic or basic catalyst. Reduction in flexural strength of the resin could be predicted by the volume swollen ratio of the resin. In the case of FRP, physical degradation was decreased by the filler, and high effectiveness of the FRP for actual use was shown. The importance of the effect of corrosion in long term use was also pointed out.

Keywords: corrosion; alcohol; methanol; unsaturated polyester resin; GFRP; physical degradation

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156855194X00213

Affiliations: 1: College of Industrial Technology, Nihon University, 1-2-1 Izumi-cho, Narashino-shi 275, Japan 2: R&D Department, Cosmo Research Institute, 1134-2 Gongendo, Satte-shi 340-01, Japan 3: Gin Wen Enterprises Co., Ltd., 31 Chang An East Road, 2nd Section, Taipei, Taiwan, Republic of China 4: Department of Chemical Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152, Japan

Publication date: 1994-01-01