Results 101 to 110 of about 376 (154)

Novolac epoxy resins and positron annihilation

Journal of Applied Polymer Science, 1993
AbstractFour kinds of epoxy resins: cresol novolac, tris‐hydroxyphenylmethane, tetramethylbiphenol, and bisphenol A, were cured with phenol novolac epoxy resins. Characteristics of these epoxy compounds were studied by the positron annihilation lifetime (PAL) technique.
T. Suzuki, Y. Oki, M. Numajiri, T. Miura, K. Kondo, Y. Shiomi, Y. Ito   +6 more
openaire   +1 more source

Block copolymer modified novolac epoxy resin

Journal of Polymer Science Part B: Polymer Physics, 2003
AbstractThe phase behavior of uncured and cured mixtures containing stoichiometric amounts of Epon164 novolac epoxy resin and 4,4′‐methylenedianiline combined with a nearly symmetric poly(methyl acrylate‐co‐glycidyl methacrylate‐b‐polyisoprene) diblock copolymer was investigated with small‐angle X‐ray scattering and transmission electron microscopy.
Bates, Frank S., Dean, Jennifer M., Grubbs, Robert B., Guo, Qi P.   +3 more
openaire   +2 more sources

Cardanol‐based novolac resins as curing agents of epoxy resins

Journal of Applied Polymer Science, 2009
AbstractTwo different novolac resins, named Nov‐I and Nov‐II, containing an amount of unreacted cardanol of 35 wt % and 20 wt %, respectively, were synthesized by the condensation reaction of cardanol and paraformaldehyde using oxalic acid as catalyst. Cardanol is the main constituent of cashew nut shell liquid, a renewable natural resource.
Pietro Campaner, Daniele D'Amico, Luigia Longo, Cristina Stifani, Antonella Tarzia   +4 more
openaire   +1 more source

Hygrothermal stability of dicyanate-novolac epoxy resin blends

Polymer Degradation and Stability, 2003
The chemical nature of the changes in a cyanate ester-novolac epoxy resin blend caused by hygrothermal ageing and the effects of the residue reaction in the blends on the hygrothermal ageing resistance were studied. The blends with epoxy molar fraction less than 0.5 absorb much less moisture in boiling water than does the homopolymer of the cyanate ...
Guo Baochun
exaly   +2 more sources

Spectral and thermal studies on polyaniline-epoxy novolac resin composite materials

Journal of Applied Polymer Science, 1999
Polyaniline-epoxy novolac resin composite materials (PANI-RESIN) were prepared by emulsion polymerization technique and characterized by infrared and electronic absorption spectra, conductivity, particle size, and thermogravimetric and differential scanning calorimetric analysis. The conductivity of PANI-RESIN samples decreased with the addition of the
T. Jeevananda, S. Palaniappan, null Siddaramaiah   +2 more
exaly   +2 more sources

Synthesis of bisphenol a novolac epoxy resins for coating applications

Journal of Applied Polymer Science, 2007
AbstractBisphenol A novolacs were synthesized in both melting and solution processes using p‐formaldehyde and formalin solution in presence of oxalic acid catalyst, respectively. Hydrogen nuclear magnetic resonance, 1H NMR, investigations show a high methylene bridge contents in the novolacs synthesized in a melting process.
Ayman M. Atta, Nevin O. Shaker, Notaila E. Nasser   +2 more
openaire   +1 more source

Flexibilized Novolac Epoxy Resin for Inhibition of Composite Propellants

Journal of Propulsion and Power, 2001
The effect of variation of polyamide hardener (EH411) on a novolac epoxy resin (Dobeckot E4)has been studied in terms of tensile strength and percent elongation. Based on a combination of tensile strength and percent elongation, formulation 9 (Dobeckot E4:100 + hardener EH411:50 )has been selected for studying the effect of liquid polysule de rubbers ...
J. P. Agrawal, N. T. Agawane
openaire   +1 more source

Thermal degradation of epoxy novolac‐phenol formaldehyde novolac resin systems

Journal of Applied Polymer Science, 1991
AbstractThe evolution of organic vapors from encapsulants at elevated temperatures has been implicated as the source of the degradation of the gold–aluminum intermetallic of the wire that connects the bond pad to the leadframe in an integrated circuit.
openaire   +1 more source

Dual-Cure Propargyl Novolac-Epoxy Resins: Synthesis and Properties

Polymers and Polymer Composites, 2004
A partially propargylated oligomeric phenolic novolac (PPN) was synthesised by the Williamson's reaction of a novolac with propargyl bromide and was characterised. Reactive blending of the PPN resin with epoxy resin resulted in a dual cure thermoset.
C.P. Reghunadhan Nair, Dhanya Vijayan, C. Gouri   +2 more
openaire   +1 more source

Synthesis of high purity o-cresol novolac epoxy resins

2008 International Conference on Electronic Packaging Technology & High Density Packaging, 2008
O-cresol novolac epoxy resins are used widely as electronic encapsulating materials. When the pitch wires in electronic systems are more slender, there are pressing demands for high purity o-cresol novolac epoxy resin which are with little content of hydrolyzable chloride. In this paper, o-cresol novolac resin was synthesized from para-formaldehyde and
null Xiao-Wei Tian, null Zhen-Guo Yang, null Jiang-yan Sun, null Zheng Ji   +3 more
openaire   +1 more source