NDLI: Immobilization of a block copolymer of styrene and quaternized 4‐vinylpyridine on latex and its effect on the cobaltphthalocyanine‐catalyzed oxidation of 2‐mercaptoethanol

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Immobilization of a block copolymer of styrene and quaternized 4‐vinylpyridine on latex and its effect on the cobaltphthalocyanine‐catalyzed oxidation of 2‐mercaptoethanol

Content Provider	Semantic Scholar
Author	Streun, Karel H. Van Tennebroek, Ronald Piet, P. German, Anton L.
Copyright Year	1990
Abstract	SUMMARY: To overcome mass transport limitations that are usually encountered on immobilizing highly active catalysts, cationic latex particles were used as support for tetrasodium phthalocyaninatocobalt(I1)tetrasulfonate (2). The cationic latex was prepared by emulsion copolymerization of styrene and divinylbenzene in the presence of a block copolymer from styrene and 4-vinylN-methylpyridinium PSqPVP serving as surfactant. The latex-bound system was found to considerably increase the reaction rate of the oxidation of 2-mercaptoethanol in the presence of 2 as compared with the conventional polymer-free system. Michaelis-Menten kinetics was observed for all three systems investigated, that is the block copolymer-stabilized latex system, the homogeneous block copolymer system and the quaternized 4-vinylpyridine homogeneous homopolymer (qPVP) system. Although the stability of the latex and qPW-containing systems after successive runs is rather poor, this immobilization method shows the great potential value of anchoring highly active systems retaining high catalytic activity. The turnover number is increased on immobilizing the block copolymer compared with the homogeneous block copolymer solution. The Michaelis constant is hardly affected by immobilization. Due to conformational changes of the polymer chain on immobilization, a comparison between the latex system and the homogeneous system containing either homopolymer or block copolymer remains difficult.
Starting Page	2181
Ending Page	2193
Page Count	13
File Format	PDF HTM / HTML
DOI	10.1002/macp.1990.021910919
Volume Number	191
Alternate Webpage(s)	https://pure.tue.nl/ws/files/2096967/619756.pdf
Alternate Webpage(s)	https://doi.org/10.1002/macp.1990.021910919
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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