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首页> 外文期刊>Journal of Applied Polymer Science >GRAFT COPOLYMERIZATION OF METHACRYLONITRILE ON KENAF FIBERS BY CERRIC ION-TOLUENE REDOX PAIR
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GRAFT COPOLYMERIZATION OF METHACRYLONITRILE ON KENAF FIBERS BY CERRIC ION-TOLUENE REDOX PAIR

机译：陶瓷对甲苯氧化还原对接枝甲基丙烯腈的接枝共聚

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The graft copolymerization of methacrylonitrile onto kenaf fibers by a cerric ion-toluene redox pair was investigated in aqueous media. Graft yield of up to 212% was found, but the grafting efficiency was not greater than 17.6%. At varying concentrations of toluene, the conversion in graft yield passed through a maximum and thereafter decreased by as much as 46% for a two-half increase in the concentration of toluene. Similarly, acetic acid showed an initial increase in graft yield in the concentration range of 0.58-1.17M and a reduction to zero graft at a 11.67M concentration of the acid. Under identical reaction conditions, acetic acid and its derivatives decreased the graft yield in the order trichloroacetic acid > monochloroacetic acid > acetic acid > formic acid. The effect of the chlorinated acids was considered as a composite consisting of normal transfer reactions and a hydrolytic effect, as strong acids, on the grafted polymers. The percentage graft yield showed a normal temperature dependence over the range 30-60 degrees C with a calculated activation energy of 6.52 kcal mol(-1). The amount of grafted polymer increased with monomer concentration, but the average molecular weight decreased with the latter, suggesting an enhanced utilization of more grafting sites on the fibers. The water-retention capacity of the graft copolymer showed an 85% reduction in its value over a threefold increase in the graft yield. (C) 1996 John Wiley & Sons, Inc. [References: 22]
机译：在水介质中研究了铈离子-甲苯氧化还原对将甲基丙烯腈接枝到洋麻纤维上。发现接枝率高达212％，但是接枝效率不大于17.6％。在甲苯浓度不同的情况下，接枝产率的转化率最大，随后降低了46％，甲苯浓度增加了一半。类似地，乙酸在浓度范围为0.58-1.17M时显示出接枝产率的初始增加，在酸浓度为11.67M时，接枝率降至零。在相同的反应条件下，乙酸及其衍生物以三氯乙酸>一氯乙酸>乙酸>甲酸的顺序降低了接枝率。氯化酸的作用被认为是由正常转移反应和水解作用（强酸）对接枝聚合物组成的复合物。接枝率百分比显示在30-60摄氏度范围内具有正常温度依赖性，计算出的活化能为6.52 kcal mol（-1）。接枝聚合物的数量随单体浓度的增加而增加，但平均分子量随单体浓度的降低而降低，这表明纤维上更多接枝位点的利用率提高。接枝共聚物的保水能力显示出其值降低了85％，超过了接枝产率的三倍。 （C）1996 John Wiley＆Sons，Inc. [参考：22]

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