β Scribed by Kise, Hideo
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The reaction of poly(vinyl chloride) powder with aqueous sodium hydroxide solution in the presence of quaternary ammonium or phosphonium halides yielded dehydrochlorinated products of conjugated polyene structure. The reaction was discussed in terms of a phase transfer catalytic mechanism between aqueous and polymer phases. Among the catalysts used tetrabutylammonium bromide was the best. To obtain the optimum conditions the effects of reaction temperature, the concentration of NaOH and the catalyst, and the molecular weight of poly(vinyl chloride) were investigated. Treatment of PVC films and solutions in tetrahydrofuran with aqueous NaOH solutions under twoβphase conditions also produced dehydrochlorinated films and powders.
π SIMILAR VOLUMES
Poly(ethylene glycol)s [HO(CH 2 CH 2 O) n H, where n ΟΎ 3] are highly active and selective in catalyzing dehydrochlorination of poly(vinyl chloride) in organicaqueous hydroxide two-phase systems. Their catalytic activity and stability are much higher than those of widely used quaternary ammonium or p
The crystallization in UeO,-NaCl-H,O, CdO-NaOH(NaC1)-H,O, CdO-Ge0,-H,O, CdO-GeO,-NaOH (NaC1)-H,O systems is investigated iiiidcr hydrnthcrmal coiiditioiis depending on the initial iatio of CdO and GeO, oxides in starting material and rolrent concentration. Single crystal5 of six Cd-germanates and fi