用于牙科复合材料的基于脂环族环氧化物的二甲基丙烯酸酯。
Dimethacrylate based on cycloaliphatic epoxide for dental composite.
作者信息
Shi Suqing, Nie Jun
机构信息
Key Laboratory of Biomedical Polymers of Ministry of Education, Department of Chemistry, Wuhan University, Wuhan 430072, PR China.
出版信息
Dent Mater. 2008 Apr;24(4):530-5. doi: 10.1016/j.dental.2007.05.018. Epub 2007 Jul 30.
OBJECTIVES
The aim of this study was to investigate the kinetics and mechanical properties of dimethacrylate monomer based on cycloaliphatic epoxide for dental restorative composite.
METHODS
Dimethacrylate based on cycloaliphatic epoxide (EPCDMA) was copolymeirzed with TEGDMA by varying the curing conditions: monomer composition and light intensity. A real-time near FTIR technique was employed to monitor the double bond conversion and the rate of polymerization. Dynamic mechanical analysis was performed on a dynamic mechanical analyzer, and volume shrinkage of the cured samples was determined by pycnometric method.
RESULTS
The results of kinetics showed that, two peaks of maximum rate of polymerization (Rpmax) occurred when the amount of TEGDMA was more than 30wt%. Increasing the amount of TEGDMA, the final double bond conversion and polymerization shrinkage both increased, while the glass transition temperature (Tg) decreased. All EPCDMA/TEGDMA mixtures had slightly higher storage modulus at body temperature (37 degrees C). When compared with Bis-GMA/TEGDMA (70/30), the EPCDMA/TEGDMA (70/30) system assumed similar reactivity and volume shrinkage but higher Tg.
SIGNIFICANCE
EPCDMA had comparable mechanical properties to those of Bis-GMA.
目的
本研究旨在探究基于脂环族环氧化合物的二甲基丙烯酸酯单体用于牙科修复复合材料的动力学和力学性能。
方法
通过改变固化条件（单体组成和光强度），将基于脂环族环氧化合物的二甲基丙烯酸酯（EPCDMA）与TEGDMA进行共聚。采用实时近红外傅里叶变换红外光谱（FTIR）技术监测双键转化率和聚合速率。在动态力学分析仪上进行动态力学分析，并通过比重瓶法测定固化样品的体积收缩率。
结果
动力学结果表明，当TEGDMA的含量超过30wt%时，出现两个聚合速率最大值（Rpmax）峰。增加TEGDMA的含量，最终双键转化率和聚合收缩率均增加，而玻璃化转变温度（Tg）降低。所有EPCDMA/TEGDMA混合物在体温（37℃）下具有略高的储能模量。与Bis-GMA/TEGDMA（70/30）相比，EPCDMA/TEGDMA（70/30）体系具有相似的反应活性和体积收缩率，但Tg更高。
意义
EPCDMA具有与Bis-GMA相当的力学性能。
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