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Abstra~: Film-forming aromatic polyimines were prepared by low temperature solution polymerization of aromatic dialdehyde and aromatic diamine using m-cresoL The polymerization proceeded rapidly to give high molecular weight polyimine solutions. Fibrous polymers were precipitated by pouring the solutions into anhydrous methanol. Lemon yellow-to-orange films were cast in situ from the reaction solutions. The polymers showed typical C=N stretching absorption near 1620 cm -1 in infrared spectra and had high glass transitions of over 200 ~ but showed low crystallinity.

ABSTRACT:The polymerization of terephthalaldehyde and hexamethylenediamine to obtain a film-forming high molecular weight polyimine solution was considerably facilitated through the use of m-cresol as a solvent under mild conditions. The reaction was reversible, though the equilibrium favored a high product concentration. A crystalline but partially cross-linked powder and film were obtained from the solution.

synopsisBis-pisocyanahethyl disulfide (BIED) was synthesized from diethyl dithiodipropionate and its reaction with cotton in dimethylformamide was investigated. The sulfur content of the treated cotton decreased by reduction with tri-n-butylphosphine. The polarographic and infrared analyses revealed that BIED reacted with cotton both monofunctionally and bifunctionally to form branches and crosslinks, respectively. The ratio of the crosslinks to the total amount of BIED combined increased in general as the reaction progressed. X-Ray study indicated that the reaction took place mainly in the original amorphous region.