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首页> 外文期刊>RSC Advances >Rate acceleration for 4,4′-dimethoxydiphenyl nitroxide mediated polymerization of methyl methacrylate
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Rate acceleration for 4,4′-dimethoxydiphenyl nitroxide mediated polymerization of methyl methacrylate

机译：4,4'-二甲氧基二苯基硝基氧化甲基甲基丙烯酸甲酯的聚合的速率加速度

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摘要

An organic acid, camphorsulfonic acid (CSA) and three strong polar compounds, diethyl malonate (DEM), acetylacetone (AAT) and malononitrile (MN) were used to accelerate the polymerization of methyl methacrylate (MMA) mediated by 4,4′-dimethoxydiphenyl nitroxide (DMDPN). Polymerization with CSA proceeded quite fast but was not “living”. When DEM, AAT and MN were used as accelerators, MN supplied the best results. A conversion of 45% was achieved in 3 h with an optimal [MN]/[alkoxyamine] molar ratio of 3?:?1 and the dispersity index was even lower than that without any additive. Electron spin resonance (ESR) study showed the NO–C bond could be weakened by MN, resulting in a slightly increase in k _(d) . Both of the weakening of the NO–C bond and the dipole–dipole interaction between MN and DMDPN attribute to the rate acceleration, while the dipole–dipole interaction plays the pivotal role.
机译：使用有机酸，樟脑酸（CSA）和三种强极化的极性化合物，丙二酸酯（DEM），乙酰丙酮（AAT）和丙二腈（MN）加速4,4'-二甲氧基二苯基介导的甲基丙烯酸甲酯（MMA）的聚合硝基X（DMDPN）。与CSA的聚合进展相当快，但不是“生活”。当DEM，AAT和MN用作加速器时，MN提供了最佳结果。在3小时内达到45％的转化率，最佳[Mn] / [烷氧基胺]摩尔比为3？：1，分散性指数甚至低于没有任何添加剂的。电子自旋共振（ESR）研究表明NO-C键可以通过Mn削弱，导致K _（D）略微增加。无论是NO-C键的弱化和MN和DMDPN属性之间的偶极子 - 偶极交互与速率加速，而偶极偶极交互均发挥关键作用。

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