Weather-induced Degradation

F.S. Qureshi, M.B. Amin, A.G. Maadhah, and S.H. Hamid, Weather-induced degradation of linear low density polyethylene Mechanical properties. Polym. Plast. Tech. Eng., 28 (7 8), 649-662 (1989). 

The weather is variable from time to time and from place to place hence the weather trial carried out at a certain location is not fully adequate to ascertain the degradation pattern. Hamid and Prichand [36] conducted an extensive study on weather-induced degradation of LLDPE and hence used a mathematical modeling technique to describe the weathering phenomenon. 

Outstanding properties prevents light and weather induced degradation, resistant to exudation/crys-tallization in many PUR systems ... 

Hamid, S.H., Prichard, W.H. Mathematical modeUng of weather-induced degradation of polymer properties. Journal of AppUed Polymer Science, 43(1991)4, p. 651 -678... 

Apparent hysteresis also may be caused by other phenomena. During the consecutive extractions and dilution steps used as a common technique in desorption studies, weathering of the sorbent may occur, resulting in a possible increase of contaminant sorption and decrease in its release. Degradation of the contaminant induced by physicochemical or biological factors, or a volatilization process leading to a decreased contaminant concentration in solution, are additional factors affecting a true hysteresis result. 

Kiguchi [ 10] reported that hot-melted wood surfaces treated by benzylation and allylation lost surface glossiness by weathering because of the benzyl or allyl groups induced by the etherification of the surfaces. These groups can absorb ultraviolet rays and degrade the surfaces. As a result of ESC A, the... 

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