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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (5): 1424-1432.doi: 10.7527/S1000-6893.2013.0420

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

UV-curing Process and Mechanical Properties of Bisphenol A Epoxy Resin

LIU Bo, LI Yong, XIAO Jun, CHEN Yunlei, XIAO Jian   

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2013-07-14 Revised:2013-10-14 Online:2014-05-25 Published:2013-10-23
  • Supported by:

    National Key Technology Research and Development Program of China (2012BAA01B02)

Abstract:

In order to promote the application of UV-curing technology in the curing of epoxy resin and its composites, UV-curing of bisphenol A epoxy resin is studied, with the use of a self-developed curing equipment. The curing degree of the resin is measured by the FTIR spectrometry. The curing characteristics and effects of the concentration of both photoinitiator and active diluents on curing rate of the resin are investigated. On this basis, the optimal proportion for the UV-curing system is obtained as 100 to 10 to 5 mass ratio of epoxy E51 to active diluents 660A to photoinitiator 1176. The mechanical properties of UV-cured specimens are also investigated, the tensile strength and modulus can reach 32.34 MPa and 1.80 GPa and the flexural strength and modulus are 60.64 MPa and 1.73 GPa, respectively. The results reveal that the curing rate of the resin is raised up with the increasing of the photoinitiator amount. And it increases initially with the increasing of the active diluents amount, while decreases at higher concentrations. Compared with thermal curing, UV-curing technology can greatly shorten the curing time, while the mechanical properties of the UV-cured products are favorable. The research results have great significance for the application of UV-curing technology in the practical production.

Key words: epoxy resins, UV-curing, photoinitiated cationic polymerization, infrared spectrometry, mechanical property

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