Microstructure and Properties Development of Impact-modified PVC During Photoageing

Abstract

Abstract:

The effects of acrylonitrile-butadiene-styrene copolymer(ABS), acrylic resin(ACR) and chloride polyethylene(CPE) on photodehydrochlorination, photooxidative degradation and photocrosslinking of poly(vinyl chloride)(PVC) were investigated by UV-Vis, FTIR spectra and DSC. The gel content in exposed sample was estimated gravimetrically. The color change and mechanical properties of PVC during photoageing were also studied. It was found that compared with PVC, the polyene, the carbonyl and the gel content in both PVC/ACR and PVC/CPE blends became much lower after irradiated by UV. The ΔT_g of PVC/ACR blend and PVC/CPE blend were 79% and 24% lower than that of the blank, respectively. However, the reverse phenomena could be found in PVC/ABS blend. Especially, the gel content of PVC/ABS was much higher than that of PVC. These indicate that the addition of ACR and CPE decelerate photodehydrochlorination, photooxidation and photocrosslinking of PVC, while the addition of ABS accelerates the reactions. As a result, the PVC/ACR and PVC/CPE blends have higher color stability and mechanical properties than those of PVC/ABS blend during the photoageing.

Key words: Poly(vinyl chloride)(PVC), Photoageing, Impact-modifier, Oxidative, Degradation, Crosslinking, Microstructure

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PI Hong, CHEN Shen-Qing, GUO Shao-Yun*. Microstructure and Properties Development of Impact-modified PVC During Photoageing[J]. Chem. J. Chinese Universities, 2009, 30(5): 1029.

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Microstructure and Properties Development of Impact-modified PVC During Photoageing

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