Photochemistry of polymeric systems. I. Photocrosslinking of polymers and copolymers containing pyridine N-oxide groups

Autor:	Alain Lablache-Combier, Claude Loucheux, Jean-Luc Decout
Rok vydání:	1980
Předmět:	chemistry.chemical_classification Materials science Pyridine-N-oxide Polymer Photoresist Cleavage (embryo) Photochemistry Styrene chemistry.chemical_compound chemistry Photosensitivity Polymer chemistry Copolymer Irradiation
Zdroj:	Journal of Polymer Science: Polymer Chemistry Edition. 18:2371-2390
ISSN:	1542-9369 0360-6376
DOI:	10.1002/pol.1980.170180729
Popis:	Vinylpyridine-N-oxide units were introduced in polymeric chains in order to study their photocrosslinking. Copolymers of styrene and 4-vinylpyridine-N-oxide were especially synthesized and studied. The methods used for characterization of photocrosslinked films were a “photoresist test” or the measurement of the insolubility and of the swelling ratio. The Cleavage of the N-oxide bond was responsible for the photocrosslinking. The competitive formation of carbonyl compounds took place and decreased the rate of photocrosslinking. This last reaction is favored by triplet-state quenchers. The photosensitivity of the copolymers was determined as a function of the wavelength of the radiation used. When the photocrosslinking proceeded, a film of the copolymeric material became transparent in the 280–320-nm range. Thick films could therefore be completely photocrosslinked when irradiated in this range of wavelength.
Databáze:	OpenAIRE
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