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Compatibility of photostabilizers with isotactic polypropylene

J. Mikovič, P. Ambrovič, Z. Maňásek, and M. Karvaš

Polymer Institute, Slovak Academy of Sciences, 809 34 Bratislava


Abstract: Compatibility of two homological series of photostabilizers: 2-hydroxy-4-n-alkoxybenzophenones (n = 1,2,4,8,12 and 18) and 2(2'-hydroxy-5'-n-alkylphenyl)benztriazoles (n = 1,2,4,8 and 12) with crystalline isotactic polypropylene has been studied by the method of melting point depression and isothermal crystallization, respectively. It was found that with increasing number of carbon atoms in the alkoxy and alkyl chain of the stabilizers their compatibility with polypropylene improved. The values of the heat of fusion per repeating unit of polymer, ΔHu, prove to be for individual mixture in conjunction with the isothermal crystallization rate. The microphotographic observation of the mixtures confirms the increase of the mixture homogeneity along with the prolongation of the alkyl or alkoxy substituents of the photostabilizers.

Full paper in Portable Document Format: 272a255.pdf


Chemical Papers 27 (2) 255–262 (1973)

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