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Infrared spectroscopy was used to follow the kinetics of formation of castor-oil-based polyurethane/poly(methyl methacrylate) interpenetrating polymer networks (PU/PMMA IPNs) at room temperature. The synthesis of the individual networks, PU, PMMA and IPNs was studied by measuring the decrease of...
The effect of carbonization temperature on the properties of prewoven carbon fibre made from a rayon precursor is examined. Bulk composition is contrasted with surface elemental analysis (XPS) which shows that low carbonization temperatures (2300F, 1260C) produce a fibre with up to 15 and 5 at.%...
Polyimides containing imide and (p-phenoxy)imide side groups were obtained by the interaction of new aromatic tetramines, bis(3-amino-4-(p-aminophenoxy))arylenes, with equimolar amounts of aromatic tetracarboxylic acid dianhydrides and twofold molar amounts of aromatic dicarboxylic acids...
A series of fluorinated polyinides and fluorinated polyimides containing heterocyclic moieties were prepared and investigated to determine their dielectric constants, dielectric constants as a function of relative humidity (RH) and thermal properties. Thle fluorinated polyimides containing...
The Michael addition reaction of N,N'-l,4-phenylene bis(maleimide) (PBM) with 4,4'-diamino diphenyl methane (DDM) at 1:1, 1: 1.5 and 1:2 molar ratios was carried out in melt at 125-130'C. The resultant polyimide oligomers (PBM-DDM) were characterized by elemental analysis, number of amino and...
A series of new functionalized poly(arylene-ether ketone) copolymers has been prepared by the nucleophilic aromatic displacement reaction from 4,4'-difluorobenzophenone and mixtures of bisphenol-A and 2,2'-bis(3-allyl,4-hydroxyphenyl)-hexat Luoropropane (6F-DABA) in the presence of potassium...
Linear unsaturated polyesters, characterized by the presence along the polymer chain of azo groups between aromatic rings, have been prepared by reacting 3,5-bis(p-hydroxybenzylidene)isopropyl piperidinone (BHIP, I) or 3,5-divanillylidene isopropylpiperidinone (DVIP, It) with 4,4'-azodibenzoyl...
Polyimide matrix composites possess an excellent balance of physical and thermal properties. However, currently available systems suffer from a number of drawbacks. Much of R & D is aimed at overcoming these drawbacks and developing new and novel polyimide materials. This review paper will...
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