NDLI: Laser photolytic studies of sensitizers for negative photoresists: 2,7-diazidofluorene in poly (methyl methacrylate) films

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Laser photolytic studies of sensitizers for negative photoresists: 2,7-diazidofluorene in poly (methyl methacrylate) films

Content Provider	Royal Society of Chemistry (RSC)
Author	Toriumi, Minoru Ueno, Takumi Yamamoto, Tsutomu Itaya, Akira Miyasaka, Hiroshi
Copyright Year	1996
Abstract	The time evolution of the transient absorption spectra of 2,7-diazidofluorene(DAF)(N3–R –N3) under excimer laser irradiation has been investigated in poly(methyl methacrylate)(PMMA) films and in inert cyclohexane solution and compared with the results for 4,4′-diazido-3,3′-dimethoxybiphenyl (DADMB), which has a similar biphenyl skeleton to DAF. The results from a DAF-cyclohexane solution containing diethylamine indicated that, in addition to the triplet azido nitrene (:N –R –N3) which was the main intermediate, didehydroazepine derivatives were generated. The formation of these intermediates in solution and in PMMA films was completed within the duration of the laser pulse. The reaction of these intermediates in solution was completed within 10 ms and in PMMA films within 100 s, while the reaction related to the azido nitrene of DADMB in PMMA films continued up to 1200 s. The results for 1% w/w DAF-doped PMMA films irradiated with a high fluence indicated that the azido nitrene and the dinitrene (:N –R –N:) underwent dimerization and/or further polymerization, suggesting that DAF molecules form aggregates even in dilute PMMA films (1% w/w). The difference in the miscibility of DAF and DADMB in PMMA affected the photoreaction behaviour of these diazido compounds in polymer films.
Starting Page	705
Ending Page	710
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	6
Issue Number	5
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9960600705
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DAF DADMB PMMA DAF Trucks Excimer laser Poly(methyl methacrylate) Para-Methoxy-N-methylamphetamine Cyclohexane Diethylamine Nitrene Laser Polymerization Polymer
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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