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首页> 外文期刊>Journal of Applied Polymer Science >Studies on graft copolymerization of 4-vinylpyridine onto guar gum
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Studies on graft copolymerization of 4-vinylpyridine onto guar gum

机译：瓜尔胶上4-乙烯基吡啶的接枝共聚研究

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摘要

Graft copolymerization of 4-vinylpyridine (4-VP) onto guar gum (GOH) using potassium monopersulfate (PMS)/thioacetamide (TAA) as a redox pair was studied in an aqueous medium under inert atmosphere. The concentration of potassium monopersulfate and thioacetamide should be 1.0 X 10(-2) and 5.0 X 10(-3) mol dm(-3), respectively, for highest grafting ratio and efficiency. Efficient grafting was observed at 19.25 X 10(-2) and 4.87 X 10(-2) mol dm(-3) concentration of 4-vinylpyridine and sulfuric acid, respectively. The optimum temperature for grafting is 30degreesC. As the time period of reaction is increased, the grafting ratio increases, whereas efficiency decreases. The plausible mechanism of grafting has been suggested. A sample of guar gum and guar-4-vinylpyridine were subjected to thermogravimetric analysis with the objective of studying the effect of grafting 4-vinylpyridine on the thermal stability of guar gum. (C) 2002 Wiley Periodicals, Inc. [References: 15]
机译：在惰性气氛下，在水性介质中研究了使用单过硫酸钾（PMS）/硫代乙酰胺（TAA）作为氧化还原对的4-乙烯基吡啶（4-VP）与瓜尔胶（GOH）的接枝共聚。为了获得最高的接枝率和效率，单过硫酸钾和硫代乙酰胺的浓度应分别为1.0 X 10（-2）和5.0 X 10（-3）mol dm（-3）。分别在19.25 X 10（-2）和4.87 X 10（-2）mol dm（-3）浓度的4-乙烯基吡啶和硫酸中观察到有效的接枝。接枝的最佳温度为30℃。随着反应时间的增加，接枝率增加，而效率降低。已经提出了合理的嫁接机理。对瓜耳胶和瓜尔胶4-乙烯基吡啶样品进行热重分析，目的是研究接枝4-乙烯基吡啶对瓜耳胶的热稳定性的影响。 （C）2002 Wiley Periodicals，Inc. [参考：15]

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