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第四届亚洲土工合成材料学术大会论文集 英文版_59.docx

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wavelengths being more severe.The energy required to generate free radicals inpolyolefins is lower than that to break a bond. In thissense, polyolefins are more susceptible to UV degradationthan other types of polymers.UV stabilizers are widely used in geosynthetics to reducesensitivity of polymers to photo-oxidation by increasingthe duration of the induction period. There are some typessuch as pigments. UV absorbers, quenchers and freeradicals deactivators (such as HALS). Pigments and UVabsorbers act as a screen, absorbing UV radiation beforethey cause damage. Quenchers deactivate excited states,removing the energy from liaisons that have been excitedby photons and inhibiting the way of the formation of freeradicals. HALS are primary antioxidant, which have theparticularity to involve a cyclic, and regenerativestabilization process. They are very effective to protectpolyolefin resins. Suits and Hsuan (2003) described threediffereni groups of UV stabilizers: carbon black. UV
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Term
Summer
Professor
Eric Larson
Tags
Ultraviolet, MFI

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