Results 171 to 180 of about 1,544 (217)
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Advanced Materials for Optics and Electronics, 1994
AbstractThe performance of novolac–diazonaphthoquinone‐based positive‐working resists is discussed in terms of the molecular weight distributions and microstructures of the novolac resins and the structural variations in the photoactive dissolution inhibitor.
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AbstractThe performance of novolac–diazonaphthoquinone‐based positive‐working resists is discussed in terms of the molecular weight distributions and microstructures of the novolac resins and the structural variations in the photoactive dissolution inhibitor.
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Polymerization of unsaturated novolac ester
Polymer Science U.S.S.R., 1964THE valuable properties of phenol-formaldehyde resins have been known for a long time and account for their wide application in the various branches of industry. However, certain shortcomings of these resins necessitate their chemical modification and numerous papers deal with this problem (see e.g. [1]).
Yu.S. Lipatov +2 more
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Statistical aspects for the production of novolacs
Polymer, 1982Abstract Statistical parameters for the phenol (P)-formaldehyde (F) condensation under acid conditions are derived in the frame of Flory-Stockmayer's theory. Phenol is assigned an average functionality f = 2.31 as proposed by Drumm and Le Blanc (1972).
J. Borrajo +2 more
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The structure and viscoelasticity of novolac resins
Polymer Journal, 2014In this work, we discuss the dynamic viscoelasticity of three novolac resins with different molar masses and methylene linkage patterns (para–para′, ortho–ortho′ and ortho–para′ methylene linkages) to clarify the relationship between the structure and viscoelastic properties of novolac resins.
Satoshi Maji +2 more
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Dielectric studies on sulphonated novolacs
European Polymer Journal, 1980Abstract The dielectric constants of novalac type of phenolic resins and their sulphonated derivatives were studied as a function of frequency, temperature and extent of sulphonation. The effect of moisture on the dielectric constant has also been reported.
P.S. Vishwanathan +2 more
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Preparation of formylated Novolacs and their photoreaction
Polymer, 1994Formylated Novolacs were prepared by the reaction of Novolacs with formic acid-acetic anhydride in the presence of pyridine in tetrahydrofuran at room temperature. When the resulting formylated Novolacs films were exposed to deep-ultra-violet light, photochemical decomposition of the formyl group was observed.
Nobuyoshi Ito +2 more
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A 13C n.m.r. study of the sulphonation of novolacs
Polymer, 1985Abstract A parameter scheme has been devised for predicting the 13C shifts of atoms in the aromatic rings of phenols substituted with SO−3, CH2Ar and CH3 in an alkaline medium, from the measured shifts of 30 different substituted benzene rings.
Allan H. Fawcett +3 more
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SPIE Proceedings, 1996
Supercritical fluids were used to fractionate a conventional 60 meta/40 para cresol novolac into five narrow polydispersivity fractions. Single and multiple fractions were esterified with a DNQ moiety and recombined to obtain a resist having essentially the same molecular weight and composition as the original parent novolac.
Alfred T. Jeffries III +5 more
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Supercritical fluids were used to fractionate a conventional 60 meta/40 para cresol novolac into five narrow polydispersivity fractions. Single and multiple fractions were esterified with a DNQ moiety and recombined to obtain a resist having essentially the same molecular weight and composition as the original parent novolac.
Alfred T. Jeffries III +5 more
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Reaction of novolac resin with aromatic dinitriles
Russian Journal of Applied Chemistry, 2011Cross-linking of Novolac resin with aromatic dinitriles in the presence of aluminum chloride was studied.
V. F. Burdukovskii, D. M. Mognonov
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Dissolution promotion in novolac-diazoquinone resists
SPIE Proceedings, 1997Phenols or polyphenols of low molecular weight are added to novolak resists to increase the dissolution rate. They function as dissolution promoters by introducing additional hydrophilic percolation sites (OH-groups) into the system. All low molecular weight phenols act as dissolution accelerators, but some are also able to increase the image contrast ...
Hsiao-Yi Shih, Arnost Reiser
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