Results 131 to 140 of about 571 (183)

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
exaly   +2 more sources

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 ...
Baochun Guo, Demin Jia
exaly   +2 more sources

Porous epoxy phenolic novolac resin polymer microcapsules: Tunable release and bioactivity controlled by epoxy value

Colloids and Surfaces B: Biointerfaces, 2018
Microcapsules (MCs) prepared with diverse wall material structures may exhibit different properties. In this study, MCs were fabricated with three kinds of epoxy phenolic novolac resins (EPNs), which possessed unique epoxy values as wall-forming materials by interfacial polymerization.
Xian-Peng Zhang, Da-Xia Zhang, Bei-Xing Li   +2 more
exaly   +3 more sources

Novel organophosphorus flame retardants and their synergistic application in novolac epoxy resin

Polymer Degradation and Stability, 2018
Abstract The novel oligomeric organophosphorus compounds oligo[DOPAc-2-TAEI] (oDOPI), oligo[DOPAc-1-DMPAc-1-TAEI] (oDOMPI) and oligo[DMPAc-2-TAEI) (oDMPI) were prepared in a one-pot process. At first, a Phospha-Michael-addition of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and/or dimethylphosphite (DMP) to tris(acryloyloxy)ethyl ...
Christian Schmidt, Michael Ciesielski, Lara Greiner, Manfred Döring   +3 more
openaire   +2 more sources

Investigation on the Flame Retardant Properties and Fracture Toughness of DOPO and Nano-SiO2 Modified Epoxy Novolac Resin and Evaluation of Its Combinational Effects [PDF]

Materials, 2019
In this study, the flame-retardant, thermal and mechanical properties of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and nano-SiO2 modified epoxy novolac resin is evaluated, and the combinational effects of both additives are verified. As a
Karin Peter, Volker Altstädt, Martin Möller   +2 more
exaly   +2 more sources

Blends of Epoxy and Epoxidized Novolac Resins

Journal of Elastomers & Plastics, 2005
The effect of the addition of two types of epoxidized novolac resins separately to cold-set bisphenol-A-based epoxy resin has been investigated in this study. Bisphenol A epoxy resins containing 2.5-20 wt% of epoxy novolac are cured in the presence of a polyamide hardener and tested for thermal and mechanical properties, hardness, water absorption, etc.
K. P. Unnikrishnan, Eby Thomas Thachil
openaire   +1 more source

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

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

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