Organotin polymers distribution

Because the cross-linked polymer molecule in Eq. (1.7.1) has several phenyl rings, the reaction in Eq. (1.7.2) would lead to several organotin groups distributed randomly on the network polymer molecule. 

It follows from these findings that the simultaneous presence of both anhydride and organotin groups in the copolymer structure and their regular distribution among the macromolecular chain is a prerequisite for photochemical cross-linking of a polymer. 

Distribution of internal stresses in organotin coatings is defined by formation of two phase boundaries, i.e. gas-liquid (polymer, as highviscous liquid), liquid-solid body (Fig.I). In this model the internal stresses are presented as balls with dimensions proportional to stress value and arrows show direction of forces. The coating damage starts from the surface and boundary layers. 

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