✦ LIBER ✦

Halogenation of poly(p-methylstyrene)

✍ Scribed by Altaf E. Qureshi; Warren T. Ford

Book ID: 103956050
Publisher: Elsevier Science
Year: 1989
Weight: 480 KB
Volume: 10
Category: Article
ISSN: 0923-1137
DOI: 10.1016/0923-1137(89)90035-3

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✦ Synopsis

The methyl groups of soluble and 1% crossfinked poly(p-methylstyrene) were chlorinated in mixtures of chloroform and aqueous sodium hypochlorite that was neutralized to pH 8.4 with HCI, both in the presence and in the absence of the phase-transfer catalyst (P TC) benzyltriethylammonium chloride. With O. 6-1.8 tool of hypochlorite and O. 01-O. 02 tool of PTC per polymer repeat unit at room temperature a degree of functionalization (DF) of 0.10-0.6 of chloromethyl groups was attained. Similarly, bromination of 1% crosslinked poly(p-methylstyrene) with sodium hypobromite solution that was neutralized to pH 8.4 with HBr proceeded without any PTC to give a DF of 0.15-0.37 of bromomethyl groups. Selected chloromethyl polymers were esterified with the cesium salts of Boc-L-valine and Boc-L-phenylalanine. * Paper taken from the Ph.D. Dissertation of Altar

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