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Abstract To investigate the optimal reaction conditions for the preparation of photosensitive polydimethylsiloxane epoxy acrylate (PESA), the PESA was synthesized through the addition reaction of poly(diphenylsiloxane) with two terminal epoxy bonds (EPDMS) and Acrylate (AA) under catalyst of addition. The conversion of epoxy groups in EPDMS was determined by means of measuring the mass fraction of epoxy groups using epoxy titration method.Then, the effects of catalyst type, reaction time, reaction temperature, catalyst dosage, and molar ratio of epoxy and AA on the conversion ratio of epoxy groups were investigated. By fourier transform infrared spectrum（FT-IR）and nuclear magnetic resonance(1H-NMR), the structure of the products were characterized. It showed that the PESA was synthesized successfully, the optimal reaction conditions was using tetraethyl ammonium bromide as reaction catalyst, and the reaction time of 4 h, reaction temperature of 110 ℃,Catalyst dosages of 1.0%（relative to quality of EPDMS）,and molar ratio of epoxy and AA of 1.04∶1.00. The conversion rate of epoxy groups in EPDMS was 99.81%.
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Received: 28 September 2020
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2020, Vol. 33 
