Formation of hydroxyl endgroups in polymers and their detection by dye tests

Palit, Santi R. ; Mukherjee, Asish R. (1962) Formation of hydroxyl endgroups in polymers and their detection by dye tests Journal of Polymer Science, 58 (166). pp. 1243-1252. ISSN 0022-3832

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The following possibilities of introducing hydroxyl endgroups in polymers have been experimentally realized: (1) redox initiation by ferrous sulfate + H2O2 (Fenton's reagent), N2H4, H2O + H2O2, FeCl3 + H2O2; photoinitiation by Fe(OH)++ + light, H2O2 + ultraviolet light or sunlight, and initiation by unstable Ag+++ complex in dark; (2) copolymerization with a trace of allyl alcohol or with traces of vinyl acetate and allyl acetate and subsequent hydrolysis; (3) chain transfer with butyl alcohols. The method of detection consists in first converting hydroxyl endgroups to carboxyl endgroups by refluxing with phthalic anhydride or 3-nitrophthalic anhydride in benzene and pyridine medium or with maleic anhydride in benzene medium and testing the resulting polymer for carboxyl endgroup by the dye-interaction test with rhodamine 6GX dye extract. The hydroxyl endgroup was also quickly converted to a strong acid endgroup like OSO3H by reacting the polymer with chlorosulfonic acid in chloroform medium under controlled conditions and tested by the dye-interaction test or a dye-partition test with methylene blue. This test is not entirely satisfactory, as the reagent attacks the thermal polymers slightly.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
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Deposited On:29 Mar 2011 13:22
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