Vinyl Uv Degredation

We are all no doubt aware of the main effect of ultraviolet uv radiation on ourselves how many of us have ended up with a red nose after a day out in the sun.

Vinyl uv degredation.

The mild uv aging of ethylene vinyl acetate copolymer eva with two vinyl acetate vac contents 14 18 wt was performed in a xenon arc source chamber. Poly vinyl alcohol pva is a common highly hydrophilic commercial polymer with that easily dissolves in water. Many natural and synthetic polymers are attacked by ultraviolet radiation and products using these materials may crack or disintegrate if they are not uv stable the problem is known as uv degradation and is a common problem in products exposed to sunlight continuous exposure is a more serious problem than intermittent exposure since attack is dependent on the extent and degree of exposure. 1 it is the second largest manufactured resin by volume worldwide poly vinyl chloride is second only to polyethylene among the five kinds of general plastic materials which was widely used in industries including architecture electronic chemical engineering packaging transportation.

Samarasekara1 department of materials science and engineering university of moratuwa sri lanka abstract. 2 shows the derivative of weight loss with respect to temperature which yields t p as presented in table 1. It is known that polyurethane and vinyl materials used for both interior and exterior applications are subject to photo degradation when exposed to ultraviolet light. Vc is classified as a priority pollutant and has been found at many national priority list sites established by us environmental protection agency atsdr 2006 the compound is produced at a large scale by the chemical industry in order to synthesize polyvinyl chloride.

Even polymers will be affected to some degree by exposure to sunlight and ultraviolet radiation. Poly vinyl chloride pvc is considered as a widely used polymer for various applications. Photo degradation is a process whereby the polymer chains in the product break down due to exposure to uv radiation. A water solution of pva is stable and highly adhesive and was used in the conservation of traditional paintings or murals as a part of a consolidating material due to its high transparency after drying.

Effect of uv aging on degradation of ethylene vinyl acetate eva as encapsulant in photovoltaic pv modules october 2014 proceedings of spie the international society for optical engineering 9179. Vinyl chloride vc is a chlorinated ethene that is of a concern due to its toxicity and carcinogenicity. The degradation mechanism was analyzed via attenuated total reflectance fourier transform infrared spectroscopy atr ftir gel content and high temperature gel permeation chromatography. Uv effects on polymers degradation and how to avoid uv degradation.

Degradation of unplasticised poly vinyl chloride based engineering products upon exposure to ultra violet radiation k. In order to calculate the activation energy based on the generalised kissinger s method the temperature of the peak degradation rate t p is required fig.