Results 161 to 170 of about 1,544 (217)

Statistics of novolacs

Industrial & Engineering Chemistry Product Research and Development, 1984
Etude de la gelification, des masses moleculaires moyennes en nombre et en poids et de la distribution de la masse ...
Mirta I. Aranguren, Julio Borrajo, Roberto J. J. Williams   +2 more
openaire   +1 more source

The Effect of Introducing B and N on Pyrolysis Process of High Ortho Novolac Resin

Polymers, 2016
In this contribution, high ortho novolac resins modified with phenylboronic acid were synthesized. The thermal stability of novolac resins cured with hexamethylenetetramine (HMTA) and chemical states of B and N via a pyrolysis process were studied.
Jin Yun, Lixin Chen, Xiaofei Zhang
exaly   +2 more sources

Novolacs from paraformaldehyde

Journal of Applied Polymer Science, 1979
AbstractNovolacs were prepared from phenol, paraformaldehyde, and variable amounts of water and methanol using oxalic acid as a catalyst. The retarding effect of water and methanol is clearly shown. Diffusion of reactants in the two‐phase system does not seem to have a bearing on the measurements of reaction kinetics.
A. J. Rojas, R. J. J. Williams
openaire   +1 more source

The curing of novolacs with paraformaldehyde

Journal of Applied Polymer Science, 1982
AbstractThe curing of novolacs with paraformaldehyde is analyzed with several experimental techniques (DSC, IR, sol fraction) as well as statistical arguments. Results for typical novolacs show that a maximum crosslinking density is attained at a mass ratio mP/mN close to 0.20.
H. E. Adabbo, R. J. J. Williams
openaire   +1 more source

Inorganic esters of novolacs

Journal of Polymer Science Part A-1: Polymer Chemistry, 1968
AbstractReaction of conventional novolacs with polyfunctional materials is known to yield crosslinked infusible products. Surprisingly, high proportions of polyfunctional phosphorus derivatives can be esterfied with o,o′‐linked novolacs without encountering gelation.
B. F. Dannels, A. F. Shepard
openaire   +1 more source

Structural analysis of novolacs

Journal of Polymer Science, 1955
AbstractThe structure of certain novolacs, prepared by polycondensation of formaldehyde with phenol, p‐cresol, and m‐cresol respectively, was investigated. The novolacs were transformed into saturated hydrocarbons, thus expelling the oxygen, by a relatively mild high pressure hydrogenation (300°C., 250 atm.) using 100% by weight of a nickelcopper on ...
C. Boelhouwer, H. I. Waterman, P. H. W. Wijnands   +2 more
openaire   +1 more source

Curing of novolac–lignocellulosic composites

Polymer International, 1995
AbstractNovalac resin (N) with hexamethylenetetramine (HTA) was cured with biomass (B) or Kraft lignin (KL) or hydroxymethylated Kraft lignin (KLH) or cellulose (CEL). The agricultural/industrial by‐product of olive stones was used as biomass. Kraft lignin, hydroxymethylated Kraft lignin and cellulose were isolated from the biomass.
J. Simitzis, K. Karagiannis, L. Zoumpoulakis   +2 more
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

Synthesis of novolac resins: 2. Influence of the reaction medium on the properties of the novolac oligomers

Polymer, 1991
Abstract The polycondensation of m -cresol with formaldehyde catalysed by oxalic acid in the presence of water-miscible organic solvent was investigated. The influence of the reagents' molar ratio and the effect of the nature and quantity of the solvent used on the molecular weight characteristics of the oligomers formed and on the content of free ...
St. Miloshev, P. Novakov, Vl. Dimitrov, I. Gitsov   +3 more
openaire   +1 more source