Synthesis and characterization of a polymerizable benzophenone derivative and its application in styrenic polymers as UV-stabilizer

摘要

In this paper, a polymerizable UV-stabilizer 2-hydroxy-4-(3-methaeryloxy-2-hydroxylpropoxy) benzophenone (BPMA) was synthesized by the reaction of 2,4-dihydroxybenzophenone (UV-0) and glycidyl methacrylate (GMA), and characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (H-1 NMR). The results show that BPMA, with high UV-absorbing performance, has been synthesized successfully. Poly(St-co-BPMA) was prepared by emulsion copolymerization of styrene (St) and BPMA, and tested by H-1 NMR, UV-Vis, gel permeation chromatography (GPC) and differential scanning calorimeter (DSC). The results reveal that BPMA had been added to the polymer chain as copolymer and the UV-resistant performance of poly(St-co-BPMA) was enhanced significantly by the incorporation of BPMA onto the polymer chains. Poly(St-co-BPMA) was irradiated under UV light and insoluble substance, reduced viscosity, weight loss and UV-Vis absorption spectra were used to determine the degradation of poly(St-co-BPMA). The results show that BPMA is an effective UV-stabilizer in protecting poly(St-co-BPMA) from UV destroys. We also take water extraction test on poly(St-co-BPMA), PSt/UV-0 blends, and the results show that migration problem can be resolved by anchoring the UV-stabilizer onto the polymer chain. (C) 2007 Elsevier Ltd. All rights reserved.