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Synthesis and photochemical investigations of novel bistriazene polyurethanes

Paper ID Volume ID Publish Year Pages File Format Full-Text
28359 44071 2007 8 PDF Available
Title
Synthesis and photochemical investigations of novel bistriazene polyurethanes
Abstract

Two bistriazene monomers, 1,1′[4,4′-diphenyl]-3,3′-di(β-hydroxyethyl, methyl)-bistriazene (T1) and 1,1′[4,4′-diphenylsulfone]-3,3′-di(β-hydroxyethyl, methyl)-bistriazene (T2) were prepared by an electrophilic N–N coupling of substituted aryldiazonium salts with N-methyl-aminoethanol, and further employed as reaction partners for 2,4-toluene diisocyanate (2,4- and 2,6-TDI isomer mixture, 80:20, v/v) or 4,4′ methylene bis(phenylisocyanate) to achieve hard type bistriazene polyurethanes. The synthesized monomers and polymers were characterized by analytical and spectroscopic methods, while the surface morphology of polymers was visualized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Photochemical assessment of the triazene moieties in monomers and polymers was carried out in solution (methanol, DMF) and film state, following the decreasing under UV irradiation of the π–π* absorption band in the corresponding UV spectra, the kinetic evaluation indicating a first order photoprocess. Laser ablation experiments performed at an irradiation wavelength of λ = 308 nm illustrate that bistriazene polyurethanes have a high potential to furnish good quality surfaces intended for microlithography.

Keywords
Bistriazene diol; Hard triazene polyurethanes; Photolysis; UV irradiation; Laser ablation
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Synthesis and photochemical investigations of novel bistriazene polyurethanes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 186, Issues 2–3, 25 February 2007, Pages 270–277
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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