Reference

Functional polymers and sequential copolymers by phase transfer catalysis

Functional polymers and sequential copolymers by phase transfer catalysis. VII. Synthesis and characterization of alternating block copolymers of aromatic poly(ether sulfone)s with aliphatic polysulfides and aliphatic polysulfones. Percec, V.; Nava, H.; Auman, B. C. (Dep. Macromol. Sci., Case West. Reserve Univ., Cleveland, OH 44106, USA). Polym. J. (Tokyo), 16(9), 681-91 (English) 1984. CODEN: POLJB8. ISSN: 0032-3896. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) a,w-Dibromopoly(hexamethylene sulfides) were polyetherified with a,w-bis(4-hydroxyphenyl) arom. poly(ether sulfones) in the presence of Bu4NHSO4 [32503-27-8] (stoichiometric amts. based on phenolic end groups) as phase transfer catalyst, in 2-phase system of 50% aq. NaOH and PhCl. The alternating block copolymers obtained were transformed into poly(hexamethylene sulfone) arom. poly(ether sulfone) alternating block copolymers by oxidn. with m-chloroperbenzoic acid in CHCl3 soln. DSC anal. of both types of alternating block copolymers show phase sepn., due to the crystn. of the poly(hexamethylene sulfide) or poly(hexamethylene sulfone) blocks.

Phase-transfer catalysis in the chemical modification of polymers

Phase-transfer catalysis in the chemical modification of polymers. 1. N'Guyen, Thanh Dung; Deffieux, Alain; Boileau, Sylvie (Lab. Chem. Macromol., Univ. Pierre Marie Curie, Paris, Fr.). Polymer, 19(4), 423-6 (English) 1978. CODEN: POLMAG. ISSN: 0032-3861. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Polymers contg. pendant amine groups were prepd. by the reaction of amines with chloromethylated polymers, e.g. polyepichlorohydrin [24969-06-0] and epichlorohydrin-ethylene oxide copolymer [24969-10-6], in the presence of phase transfer catalysts, e.g. Bu4NHSO4 [32503-27-8], dicyclohexyl-18-crown-6 [16069-36-6], and Kryptofix 222 [23978-09-8]. The influence of solvent, catalyst, and reaction time were studied and the nature of the amine and the polymeric substrate was varied.