The moisture in contact with the greenhouse films can have combined effects of unique physical properties with its chemical reactivity . The water in contact with polymers may have three kinds of effects that may contribute to degradative reactions: (i) hydrolysis of labile bonds, such as those of polyesters or polyamides; (ii) physical destruction of the bonds between polymer and a filler, resulting in chalking or fiber bloom; rain may wash away water-soluble degradation products and additives; moisture, can contribute to swelling of certain plastics, and (iii) photochemical effect, in solving the generation of hydroxyl radicals or other reactive species that can lead to promotion of free-radical reactions [27, 28]. In order to assess the role of various weather parameters on the degradation of plastics, it is critical to have accurate climatological data corresponding to the exposure sites.
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