TAILIEUCHUNG - Báo cáo "Thermomechanical characteristics of rigid poly(vinyl chloride) crosslinked by a peroxide in the presence of trimethylolpropane trimethacrylate "

This paper presents some thermomechanical characteristics of crosslinked poly(vinyl chloride) (PVC) samples such as glass transition temperature (Tg), softening point (Ts), and linear thermal expansion coefficient ( ). Probe load of N is most suitable to evaluate expansion, softening and contraction of the crosslinked PVC samples. Tg , Ts and of the crosslinked PVC samples are higher than those of the uncrosslinked samples. | Journal of Chemistry Vol. 42 1 P. 110 -114 2004 THERMOMECHANICAL CHARACTERISTICS OF RIGID POLy VINyL CHLORIDE CROSSLINKED By A PEROXIDE IN THE PRESENCE of TRIMEThyLOLPROPANE TRIMETHACRyLATE Received 5-4-2003 THAI HOANG1 NEIL VARSHNEY2 institute for Tropical Technology Vietnamese Academy of Science and Technology institute of Polymer Technology and Material Engineering Loughborough University the United Kingdom SUMMARY This paper presents some thermomechanical characteristics of crosslinked poly vinyl chloride PVC samples such as glass transition temperature Tg softening point Ts and linear thermal expansion coefficient a . Probe load of N is most suitable to evaluate expansion softening and contraction of the crosslinked PVC samples. Tg Ts and a of the crosslinked PVC samples are higher than those of the uncrosslinked samples. The highest Tg is observed in the PVC sample containing phr of 1 1-di- t-amylperoxy cyclohexane DAPC and 10 phr of trimethylolpropane trimethacrylate TMPTMA . Among the crosslinked PVC samples the sample with phr of DAPC and 15 phr of TMPTMA has the least Ts. The highest a appears in the PVC sample containing phr of DAPC and 5 phr of TMPTMA. I - INTRODUCTION Thermomechanical analysis TMA is an effective method for determination of dimension and thickness changes thermal characteristics of polymers such as glass transition temperature softening point and thermal expansion coefficient etc. This method shows influence of chemical modification crosslinking on expansion softening and penetration resistance of polymers. For poly vinyl chloride PVC crosslinked by aminosilanes Fiaz has shown that crosslinking improved penetration resistance of PVC due to formation of gel part in the material 1 2 . In a previous paper crosslinking of rigid PVC by a new peroxide 1 1-di- t-amylperoxy cyclohexane DAPC in the presence of trimethylolpropane trimethacrylate TMPTMA was reported 3 . Gel content and tensile properties of the peroxide .

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