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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics studies on copolymerization of acrylonitrile vinyl acids by solvent-water suspension polymerization
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Kinetics studies on copolymerization of acrylonitrile vinyl acids by solvent-water suspension polymerization

机译：溶剂-水悬浮聚合法共聚合丙烯腈乙烯的动力学研究

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Polyacrylonitrile is an important polymer that is widely used in the manufacture of synthetic fibers, particularly for applications in apparel. Although a vast amount of literature is available on the polymerization process of acrylonitrile (AN) with other monomers, there are few reports of studies on polymerization in a mixed solvent of water with an organic solvent. It is conceivable that this method could combine the advantages of the solution and suspension polymerization methods. Synthesis of AN copolymers with two vinyl acids, methacrylic acid (MAA) and itaconic acid (IA), is carried out by solvent-water suspension polymerization. The polymerizations are performed with an equal ratio mixture of dimethylformamide as a solvent and water as a nonsolvent at 60 degrees C using alpha,alpha-azobisisobutyronitrile as an initiator. The kinetics of polymerization are studied by plotting the conversion versus reaction time for different mole ratios of AN with vinyl acids. Copolymers are characterized by FTIR and capillary viscometery. The results show that IA depresses the rate of polymerization more than MAA in this reaction medium, and this effect becomes more significant at higher vinyl acid mole ratios. High conversion in a short reaction time is obtainable for copolymers with a low vinyl acid mole fraction. However, for mole ratios of more than 93:7, the rate of the reaction is drastically reduced and low conversion (< 60%) results, even after 8 h. The intrinsic viscosities of all cases are surprisingly high. Although they are reduced with increasing acidic comonomer mole fraction, this reduction is more significant for IA compared to MAA. (c) 2005 Wiley Periodicals, Inc.
机译：聚丙烯腈是一种重要的聚合物，广泛用于合成纤维的制造，尤其是在服装中的应用。尽管关于丙烯腈（AN）与其他单体的聚合过程的文献很多，但很少有关于在水与有机溶剂的混合溶剂中聚合的研究报道。可以想象，该方法可以将溶液和悬浮聚合方法的优点结合起来。通过溶剂-水悬浮聚合反应，可以合成具有两种乙烯基酸（甲基丙烯酸（MAA）和衣康酸（IA））的AN共聚物。使用α，α-偶氮二异丁腈作为引发剂，在60℃下以等比例的作为溶剂的二甲基甲酰胺和作为非溶剂的水的混合物进行聚合。通过绘制不同摩尔比的AN与乙烯酸的转化率对反应时间的关系，研究了聚合动力学。共聚物的特征在于FTIR和毛细管粘度计。结果表明，在该反应介质中，IA比MAA更抑制聚合速率，并且在较高的乙烯酸摩尔比下，该作用变得更加显着。对于乙烯基酸摩尔分数低的共聚物，可以在短的反应时间内获得高转化率。但是，对于大于93：7的摩尔比，反应速度会大大降低，甚至在8小时后，转化率仍会很低（<60％）。所有情况下的固有粘度都很高。尽管它们随着酸性共聚单体摩尔分数的增加而降低，但与MAA相比，IA的降低更为显着。 （c）2005年Wiley Periodicals，Inc.

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