Results 21 to 30 of about 1,544 (217)
New class of reactive novolac: synthesis of bisphenol A-based novolac with methylol groups [PDF]
Polymer Journal, 2009 We successfully prepared a new class of a reactive novolac (3) having a methylol moiety as a functional group derived from its precursor synthesized by the acid-catalyzed addition–condensation of a bisphenol A derivative and formaldehyde. Curing reaction between 3 and the low-molecular-weight phenolic resin (4) afforded the curing product, which showed
Tadamasa Nemoto, Gen-ichi Konishi
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Polymerization of Phenol Formaldehyde in Solvent-Saturated Vapor and Study on the Microstructure and Mechanical Properties of Novolac Aerogel Product [PDF]
علوم و تکنولوژی پلیمر, 2014 Aerogels consist of low density open-cell foams with large void spaces of nanometer pore size and they are composed of sparsely semi-colloidal nanometer sized particles forming open porous structures.
I. Naseri +3 more
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Curing and Decomposition Behaviour of Cresol Novolac Based Vinyl Ester Resin
Chemical Engineering Transactions, 2013 Vinyl ester resins were prepared from o, m, p-cresol epoxy novolac resin and methacrylic acid in the presence of triphenyl phosphine as catalyst and hydroquinone as polymerization inhibitor. The vinyl esterresin samples having acid value of ~ 7 mg of KOH/
S. Jaswal, B. Gaur
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Studying of Wear Rate for Ternary Polymer Blends under the Influence of Chemical Solutions [PDF]
Engineering and Technology Journal, 2013 This work has been done with use of Epoxy and Novolac resins mixed with either polyurethane (PUR) or polysulphide(PSR) rubbers to compose ternary polymer blends. Two groups of samples are prepared:1. Blend A (70% Epoxy +15%Novolac+15%PUR).2. Blend B (60%
Ban Ayyoub Yousif, Balkees M. Dhyaa
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Manufacturing of speed reducer bars (break discs and bumzes) for vehicles and tractors using local raw materials [PDF]
مجلة التربية والعلم, 2005 Phenol-formaldehyde , Asbestos and Rubber blend was prepared and used as speed reducer bars ( brake-discs and bunzes) alternative to the imported one. we also succeed to prepare an asbestos and novolac blend and used as car brake bunzes.
Mohammed Al Ajili, Jamal Abbas
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Applied Sciences, 2022 For the design of stretchable and flexible high-performing materials, the reinforcement of elastomeric grades plays a crucial role. State-of-the-art fillers such as carbon black benefit from a high reinforcement but often negatively affect the processing
Lara Strohmeier +4 more
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SYNTHESIS OF NOVOLAC TYPE PHENOL FORMALDEHYDE OLIGOMERS
, 2020 Mixed novolac-type oligomers are synthesized in the melt on the base of oxibenzene and its alkilsubstituted. The content of dioxibenzene changes in the range of 0,1 – 0,5 mol.
Givi Papava +4 more
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Polímeros, 1999 Este trabalho descreve uma utilização mais nobre para a lignina obtida de processos industriais de polpação. Foram preparadas resinas fenólicas tipo novolaca, utilizando-se lignossulfonato de amônio e lignossulfonato de sódio (com diferentes teores de ...
Fernando dos Santos +1 more
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Eurasian Chemico-Technological Journal, 2020 Composites consisting of propargyl- and allyl/propargyl- modified novolac resins and carbon fabric were obtained by the vacuum infusion molding process. It was established that the presence of potassium cations remaining after the synthesis increase the ...
S. Nechausov +6 more
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Absorption properties of novolac-alumina-graphite mixture microwave absorbers in x-band frequencies
Iraqi Journal of Physics, 2021 Absorption properties (Attenuation coefficient, the percentage of the reflection, and the percentage of absorption) in x-band have been investigated in this paper for novolac – alumina- graphite mixture.
Qayes A. Abbas
doaj