Thiol-allyl ether-methacrylate ternary systems. Evolution mechanism of polymerization-induced shrinkage stress and mechanical properties
Thiol-allyl ether-methacrylate ternary systems. Evolution mechanism of polymerization-induced shrinkage stress and mechanical properties
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DOI：
10.1021/ma0624954
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发表时间：
2007-03-06
期刊：
影响因子：
5.5
通讯作者：
Bowman, Christopher N.
中科院分区：
文献类型：
--
作者：
Lee, Tai Yeon;Carioscia, Jacquelyn;Bowman, Christopher N.
研究了硫醇-烯丙基醚-甲基丙烯酸酯三元体系聚合收缩应力和力学性能的演变及其与聚合动力学的关系。由于三元体系的两个不同的聚合制度-甲基丙烯酸酯均聚制度，其次是硫醇-烯聚合占主导地位regimethe聚合诱导收缩应力的演变机制是独特的，相比其他硫醇-烯和甲基丙烯酸酯系统。在第一聚合阶段期间，仅产生中等分子量的甲基丙烯酸酯低聚物，导致延迟的凝胶化和接近零的收缩应力。紧接着第一聚合阶段，烯丙基醚开始聚合，收缩应力随着烯丙基醚转化率的增加而增加。据观察，三元体系的收缩应力表现出类似于当前牙科修复体系的收缩应力的50%。此外，由于两种聚合制度，与其他三元体系相比，机械性能的演变是独特的。应注意，三元体系的玻璃化转变温度（类似于100 ° C）比传统的硫醇-烯聚合物高得多，并且与目前用于牙科漂白的聚合物复合材料相当，表明硫醇-烯丙基醚-甲基丙烯酸酯体系是用于牙科漂白的优异候选物。
The evolution of the polymerization-induced shrinkage stress and mechanical properties of thiol-allyl ether-methacrylate ternary systems and their relationship to the polymerization kinetics have been investigated. Because of the two distinct polymerization regimes of the ternary systems-a methacrylate homopolymerization regime followed by a thiol-ene polymerization dominated regimethe mechanism for the evolution of polymerization induced shrinkage stress is unique as compared to other thiol-ene and methacrylate systems. During the first polymerization stage, only intermediate molecular weight methacrylate oligomers are produced, resulting in delayed gelation and near zero shrinkage stress. Immediately following the first polymerization stage, the allyl ether begins to polymerize, and shrinkage stress increases in correspondence with the increased allyl ether conversion. It is observed that the shrinkage stress of the ternary systems exhibits similar to 50% of the shrinkage stress of the current dental restoration systems. Also, because of the two polymerization regimes, the mechanical properties evolve uniquely as compared to other ternary systems. It is noted that glass transition temperatures of the ternary systems (similar to 100 degrees C) are much higher than traditional thiol-ene polymers and comparable to the current polymeric composites for dental restorations, indicating that the thiol-allyl ether-methacrylate systems are an excellent candidate for dental restorations.