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4,4′-diglycidyloxy- ॅ -methylstilbene (DOMS) and a novel liquid crystalline thermoset, D2A1 which is obtained from the reaction between DOMS and aniline were synthesized. The thermosets have been characterized with cross-polarized optical microscopy, differential scanning calorimetry,...
Some representative thermal, chemical and mechanical characteristics of ‘commercial type’ polyimides are presented in this second paper in a series on using water as solvent in polyimide synthesis. The commercial types of polyimide that have been produced in this study are closely related to...
Phenolic novolac was modified with hydroxyl terminated polybutadiene (HTPB) using resole as compatibilizer. These systems were characterized by differential scanning calorimetry, and IR analysis. Neat resin castings were prepared with varying percentages of HTPB. The fracture toughness of these...
The copolymerization of hexahydrophthalic anhydride (HHPA) with N , N , N′ , N′ -tetraglycidyl-4,4′-diaminodiphenylmethane (TGDDM) has been studied for several stoichiometric ratios. The rheological, thermal and dynamic mechanical behaviors of these systems were examined. Kinetic studies by...
The naturally occurring sodium and calcium cations found in bentonite clay galleries were exchanged with lithium cations. Following the cation exchange, a series of reduced charge clays were prepared by heat treatment of the lithium bentonite at 130, 150, or 170°C. Inductively coupled plasma...
The conformational rigidity parameters of some poly(phenylquinoxaline-imide)s and poly (phenylquinoxaline-imide-amide)s containing dimethylsilane units were calculated by a Monte Carlo method with allowance for hindered rotation. Several physical properties such as solubility, glass transition...
The metal complexation ability of some N -substituted maleimides containing a carboxyl group was investigated. Thus, N -(4-carboxy-phenyl)-maleimide, N -(3-acetoxy-4-carboxy-phenyl)-maleimide and poly( N -(3-acetoxy-4-carboxy-phenyl)-maleimide) were prepared and complexed with several transition...
The dilute solution properties of the new siloxane-azomethine alternating copolymers obtained by polycondensation reaction between a preformed azomethyne macromer and ॅ , ३ -bis(chloromethyl) polydimethylsiloxanes were studied by viscosity measurements. A method proposed by Qian et al .was...
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