Thermal degradation, photodegradation, oxidative degradation, and UV degradation can occur, limiting the service life of a plastic product.

Poly(vinyl chloride) is very sensitive to elevated temperatures and light, and undergoes significant deterioration when exposed to temperature and light.In order to prevent thermal degradation during processing and light-induced deterioration of the finished product, chemical compounds with a stabilising effect are used. PVC pipe can be used for most any drain, water, or ventilation application. Journal of Macromolecular Science, Part A 2013 , …

PVC has a very low thermal stability and stabilizers help prevent degradation of polymer during processing or exposure to light. low oxygen levels and temperatures up to 250°C. 208-214. The sites for initiation of the thermal degradation, the mechanism ofthe dehydrochlorination, the discoloura­ tion of PVC by heat and the influence of plasticizers on the rate of degradation are discussed. ... Over time, ultraviolet exposure can reduce the flexibility of the material through polymer degradation, leading to splintering, cracking and splitting.

The presentation concentrates on recent work and covers the recent literature. (2013). Thermal Properties, Degradation and Stability of Poly(vinyl chloride) Predegraded Thermooxidatively in the Presence of Dioctyl Phthalate Plasticizer. 2, pp. Components of the long-chain backbone of the polymer can begin to weaken and react in ways that change the properties of the polymer. Calorimetric results show that thermal‐oxidative degradation of PET is an exothermic reaction, with an apparent activation energy of 117 kJ/mol. The effect of plasticizer on the thermal degradation behavior of plasticized PVC was investigated by thermal gravimetric analysis (TGA). This chapter summarizes the research related to thermal degradation of unstabilised polyvinyl chloride (PVC) at conditions characteristic of processing, i.e. For amorphous plastics at 0-200°C, the thermal conductivity lies between 0.125-0.2 Wm-1 K-1 While there is some chemical interaction between PVC and polystyrene, the principal mode of stabilization is a physical process. PVC pipe is a popular construction material for its low cost and durability. Thermal conduction is the transfer of heat from one part of a body to another with which it is in contact. The activation energies were calculated by three well known methods, developed by Flynn-Wall-Ozawa (FWO), Friedman and Kissinger, respectively. INTRODUCTION For many years polyvinyl chloride (PVC) has been one of the most im­ of the thermal degradation of polyvinyl chloride. When subjected to heat, vinyl compounds initiate a self-accelerating dehydrochlorination reaction and these stabilizers neutralize the … 1. 50, No. A major issue in the processing of PVC is its thermal and optical stability.

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