COMPARISON OF WATER SORPTION BY METHACRYLATE AND DIMETHACRYLATE MONOMERS AND THEIR CORRESPONDING POLYMERS
COMPARISON OF WATER SORPTION BY METHACRYLATE AND DIMETHACRYLATE MONOMERS AND THEIR CORRESPONDING POLYMERS
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DOI：
10.1016/0032-3861(91)90085-w
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发表时间：
1991-01-01
期刊：
影响因子：
4.6
通讯作者：
KUSY, RP
中科院分区：
文献类型：
--
作者：
KALACHANDRA, S;KUSY, RP
一些二甲基丙烯酸乙二醇酯和甲基丙烯酸甲酯单体的吸水量通过卡尔费休分析测定。伽马射线照射后，相应的聚合物通过吸水百分比（重量分析）、扩散系数 (D) 和接触角 (θ) 测量进行表征。聚合物的吸水率近似于菲克定律。忽略双键的贡献，计算了指示这些材料的亲水特性的重量百分比氧含量（WPO），并将其与每个单体分子中存在的总氧含量相关联。在一系列四种二甲基丙烯酸乙二醇酯和八种直链甲基丙烯酸甲酯单体中观察到 WPO 和吸水百分比之间的线性关系。它们相应的聚合物符合WPO和θ之间的线性相关性。根据其 WPO，一种二甲基丙烯酸酯单体 (BIS-GMA) 吸附的水量低于预期，因为存在分子内氢键。在软甲基丙烯酸甲酯聚合物中观察到的快速初始速率归因于基质中存在的水溶性杂质。基于双官能甲基丙烯酸酯的网络的 D 值通常低于甲基丙烯酸甲酯，可能是因为前者的高度交联性质。
Water sorption of some glycol dimethacrylate and methyl methacrylate monomers was determined by Karl Fischer analysis. After gamma-irradiation, the corresponding polymers were characterized in terms of percentage water uptake (gravimetrically), diffusion coefficient (D), and contact angle (theta) measurements. Water sorption of the polymers approximated Fick's law. Ignoring the double bond contribution, the weight per cent oxygen content (WPO), which is indicative of hydrophilic character of these materials, was calculated and correlated with the total oxygen content present in each monomer molecule. A linear relationship between the WPO and percentage water uptake was observed in a series of four glycol dimethacrylate and eight linear methyl methacrylate monomers. Their corresponding polymers conformed to a linear correlation between the WPO and theta. On the basis of its WPO, one dimethacrylate monomer (BIS-GMA) sorbed less water than expected because an intramolecular hydrogen bond was present. The rapid initial rates observed in soft methyl methacrylate polymers were attributed to the water soluble impurities present in the matrix. The D values of the networks based on difunctional methacrylates were generally lower than methyl methacrylates, presumably because of the highly crosslinked nature of the former.