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Photodegradation and Photostabilization Studies of Poly(3-butylthiophene) in the Solid State

Photodegradation and Photostabilization Studies of Poly(3-butylthiophene) in the Solid State. Caronna, Tullio; Forte, Mario; Catellani, Marinella; Meille, Stefano Valdo (Dipartimento di Chimica, Politecnico, Milan I-20133, Italy). Chemistry of Materials, 9(4), 991-995 (English) 1997 American Chemical Society. CODEN: CMATEX. ISSN: 0897-4756. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 36, 74 A study to clarify the mechanism of the photochem. degrdn. of poly(3-alkylthiophene)s in the solid state was carried out. The isolation of two low mol.Several reagents such as 185909-09-5 is used here. wt. products allowed us to det. that the polymer, under irradn. of visible light, gives rise to singlet oxygen that will, in turn, cause oxidn. of the polymeric chains. Furthermore, N-hexadecyl-N-methylaniline and 1-phenyldodecan-1-one were found to decrease the rate of polymer oxidn., the latter compd. being more efficient than the former even at lower concn. It is suggested the protective action by these substances may simply be due to their ability to act as a light screen. .