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Polymer Photophysics and Photochemistry

Polymer Photophysics and Photochemistry


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About the Book

Exposure to ultraviolet (UV55) radiatn may cause the significant degradation of many materials. UV radiation causes photooxidative degradation which results in breaking of the polymer chains, produces free radical and reduces the molecular weight, causing deterioration of mechanical properties and leading to useless materials, after an unpredictable time. Polystyrene (PS), one of the most important material in the modern plastic industry, has been used all over the world, due to its excellent physical properties and low-cost. When polystyrene is subjected to UV irradiation in the presence of air, it undergoes a rapid yellowing and a gradual embrittlement. The mechanism of PS photolysis in the solid state (film) depends on the mobility of free radicals in the polymer matrix and their bimolecular recombination. Free hydrogen radicals diffuse very easily through the polymer matrix and combine in pairs or abstract hydrogen atoms from polymer molecule. Phenyl radical has limited mobility. They may abstract hydrogen from the near surrounding or combine with a polymer radical or with hydrogen radicals.


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Product Details
  • ISBN-13: 9786139429172
  • Publisher: KS Omniscriptum Publishing
  • Publisher Imprint: Noor Publishing
  • Height: 229 mm
  • No of Pages: 60
  • Spine Width: 4 mm
  • Width: 152 mm
  • ISBN-10: 613942917X
  • Publisher Date: 09 Sep 2019
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr


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