Dimethacrylate derivatives of dimer acid
Dimethacrylate derivatives of dimer acid
复制标题
DOI：
10.1002/pola.21493
复制
发表时间：
2006-06
期刊：
影响因子：
--
通讯作者：
M. Trujillo-Lemon;Junhao Ge;Hui Lu;J. Tanaka;J. Stansbury
中科院分区：
文献类型：
--
作者：
M. Trujillo-Lemon;Junhao Ge;Hui Lu;J. Tanaka;J. Stansbury
二甲基丙烯酸酯单体广泛用于各种交联聚合物应用中，包括胶粘剂、涂料、牙科修复材料和立体光刻。这些材料所具有的快速固化和良好机械性能的优点，被聚合过程中的尺寸变化问题以及因吸水和残留未反应单体损失导致的长期物理不稳定性问题所抵消。在这项工作中，合成了几种基于二聚酸结构的疏水单体实例，并对其单体和均聚物性能进行了评估。利用近红外光谱研究了光聚合反应活性和转化率。还对均聚物进行了体积收缩、吸水性、水接触角以及三点弯曲测试研究，并将结果与常用的二甲基丙烯酸酯单体进行了比较。与传统单体相比，新单体产生了更高的转化率，同时具有更低的聚合收缩率和吸水性值。由二聚酸构建的二甲基丙烯酸酯相对较低的交联密度如预期那样产生了具有高柔韧性和低模量的聚合物；然而，连接二聚酸核心与甲基丙烯酸酯端基的基团官能度的变化导致了显著的性能差异。基于二聚酸单体及其均聚物所展示的性能，这些新材料似乎非常适合用于涂料和胶粘剂等应用。
Dimethacrylate monomers are used in a wide variety of crosslinked polymer applications, including adhesives, coatings, dental restoratives, and stereolithography. The advantages of rapid curing and good mechanical properties offered by these materials are countered by problems with dimensional changes during polymerization and long-term physical instability resulting from water sorption and loss of residual unreacted monomer. In this work, several examples of hydrophobic monomers based on a dimer acid structure were synthesized, and their monomeric and homopolymer properties were evaluated. The photopolymerization reactivity and conversion were investigated with near-infrared spectroscopy. Studies of the volumetric shrinkage, water sorption, and water contact angle and three-point-bend testing of the homopolymers were also carried out, with the results compared with those of commonly used dimethacrylate monomers. The new monomers produced higher degrees of conversion combined with lower polymerization shrinkage and water sorption values in comparison with conventional monomers. The relatively low crosslink density of dimethacrylates constructed from dimer acid produced polymers with high flexibility and low modulus, as expected; however, changes in the functionality of the group linking the dimer acid core with the methacrylate end groups induced significant property differences. On the basis of the properties demonstrated by the dimer acid monomers and their homopolymers, these new materials appear well suited for applications such as coatings and adhesives.