Degradation products of pvc

2020-03-30 15:10

MECHANISM OF PVC DEGRADATION It seems generally agreed that the basic process in photo, thermal, and high energy degradation is a radical chain mechanism [1, 2 1719, Whil. e there are differing opinions concerning the initiation of the reaction, it is the conThe two stage of PVC decomposition can be the basis of dehydrochlorination treatment of PVC. The additives, such as metal oxide stabilizers and LDH stabilizers, made commercial PVC degradation complicated. The Cl can be adsorbed by LDH and metal oxide degradation products of pvc

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In PVC degradation, most studies of a fundamental nature have been directed towards degradation at processing temperatures, which may seem paradoxical to PVC processors who claim to encounter no difficulties associated with stability during processing but do show concern over weathering and aging of their products. PVC thermal degradation in vacuum up to 500 C has been followed by recording the relative rate of volatile product formation by thermal volatilisation analysis while monitoring by mass spectrometry the formation of the main products: HCl, aromatic and aliphatic hydrocarbons, anddegradation products of pvc For the catalytic degradation and dechlorination of PVC, metal oxides catalysts mainly acted as adsorbents for the evolved HCl or as inhibitors of HCl formation depending on their basicity, while zeolites and noble metal catalysts can produce lighter oil, depending the total number of acid sites and the number of accessible acidic sites.

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Heat stabilizers are a vital part of any PVC blend In general, the fluoropolymers processed by Zeus (such as PTFE, FEP, PFA, PVDF, THV, ETFE and ECTFE) have excellent intrinsic thermal degradation properties because of the strength of the carbon fluorine (CF) bonds in the long chain backbone. degradation products of pvc

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