Studies on Morphological Structure of Low Molecular Weight PVC Prepared by Vibro-Milling Degradation

Abstract

Abstract: The effect of vibro-milling on particle size,crystalline structure,optical density and the plasticizer absorption of PVC were studied through FTIR,SEM and physical property tests.The experimental results show that the intensities of crystalline absorption bands on FTIRspectra at 635 cm^-1,604^-1 and 1427 cm^-1 get weaker and the intensities of 635 cm^-1 and 604 cm^-1 bands tend to disappear during vibro-milling,while the intensity of the amorphous absorption band at 1435 cm^-1 becomes stronger,indicating that the crystalline structure of PVCis changed somewhat and the crystallinity of PVC decreases during vibro-milling.The particle size and the molecular weight of PVCare decreased.The surface area and the amount of plasticizer absorption increase with the increase of vibro-milling time.The low molecular weight PVCso prepared has ultra-fine particle size,lower crystallinity and glass transition temperature,higher plasticizer absorption capacity,should have pretty good processability.

Key words: Mechanochemistry, PVC, Morphology, Vibro-milling

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GUO Shao-Yun, XU Xi. Studies on Morphological Structure of Low Molecular Weight PVC Prepared by Vibro-Milling Degradation[J]. Chem. J. Chinese Universities, 1994, 15(1): 127.

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Studies on Morphological Structure of Low Molecular Weight PVC Prepared by Vibro-Milling Degradation

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