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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics and crystallization in pH-sensitive free-radical crosslinking polymerization of acrylic acid
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Kinetics and crystallization in pH-sensitive free-radical crosslinking polymerization of acrylic acid

机译：pH敏感的丙烯酸自由基交联聚合的动力学和结晶

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摘要

Free-radical crosslinking polymerization and crystallization of acrylic acid (AAc) were investigated by shear storage modulus (G) measurements in pH 2, as well as in pH 6 and pH 10, by varying the molar ratio of crosslinking agent (N,N-methylene bis-acrylamide; MBAAm) to AAc (0.583 x 10(-3), 1.169 x 10(-3), 1.753 x 10(-3), and 2.338 x 10(-3)). Our results showed that the pre-gelation time was the same at pH 2, regardless of the concentration of MBAAm. The propagation time was determined by the initial feed concentration of AAc, and the length of the linear curve in the propagation was proportional to the concentration of MBAAm. The Avrami exponent (n), as an indicative of growing pattern of an infinite molecule, in the crystallization was increased in proportional to the concentration of MBAAm, and generally low at pH 2. In the deceleration phase, n was observed near 1.0 throughout the all specimens. These results indicated that (1) the length of the pre-gelation period was determined by the ionization of AAc (or pH), (2) the polymerization rate of AAc was not affected by the concentration of MBAAm, and (3) the inhomogeneity of hydrogel was determined by the growing pattern of infinite molecule in propagation phase. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42195.
机译：自由基交联聚合和丙烯酸（AAc）的结晶通过在pH 2，pH 6和pH 10中的剪切储能模量（G）测量，通过改变交联剂（N，N-亚甲基双丙烯酰胺; MBAAm）转换成AAc（0.583 x 10（-3），1.169 x 10（-3），1.753 x 10（-3）和2.338 x 10（-3））。我们的结果表明，无论MBAAm的浓度如何，在pH 2下预凝胶化时间都相同。繁殖时间由最初的AAc进料浓度决定，繁殖过程中线性曲线的长度与MBAAm的浓度成正比。 Avrami指数（n）作为无限分子生长模式的指示，在结晶过程中与MBAAm的浓度成比例地增加，并且在pH 2时通常较低。在减速阶段，整个过程中n均接近1.0。所有标本。这些结果表明：（1）预胶凝时间的长短是由AAc的电离（或pH）决定的;（2）AAc的聚合速率不受MBAAm浓度的影响;（3）不均匀性通过无限分子在繁殖期的生长方式来确定水凝胶的分子量。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42195。

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