Stansbury J W
National Institute of Standards and Technology, Gaithersburg, Maryland 20899.
J Dent Res. 1990 Mar;69(3):844-8. doi: 10.1177/00220345900690030201.
The simple reaction of conventional monofunctional acrylate monomers with paraformaldehyde has yielded a new class of difunctional monomers. The unique proximity of the double bonds within these compounds allows a facile cyclopolymerization to incorporate a cyclic ether structure into the polymer backbone. The external position of the acrylate esters means that these pendant groups can be varied for alteration of the physical properties of the monomers and the corresponding polymers. A series of the new monomers has been prepared and polymerized under dilute solution and bulk conditions to yield non-crosslinked and crosslinked polymers, respectively. The polymers exhibited high degrees of conversion and significantly reduced polymerization shrinkage, compared with polymers obtained from conventional diacrylate or dimethacrylate monomers. These properties appear to be a direct result of an efficient cyclopolymerization process. The combination of improved conversion to polymer with less contraction makes these monomers ideal candidates for use in dental resin composites. A preliminary evaluation of their potential in this application has shown that with suitable ester functionality, they can be formulated to provide composites with excellent mechanical strength properties.
传统单官能丙烯酸酯单体与多聚甲醛的简单反应产生了一类新型双官能单体。这些化合物中双键独特的位置关系使得其能够轻松进行环化聚合，从而将环状醚结构引入聚合物主链。丙烯酸酯基团处于外部位置，这意味着这些侧基可以变化，以改变单体及相应聚合物的物理性质。已制备出一系列新型单体，并分别在稀溶液和本体条件下进行聚合，得到了非交联聚合物和交联聚合物。与由传统二丙烯酸酯或二甲基丙烯酸酯单体得到的聚合物相比，这些聚合物表现出高转化率且聚合收缩率显著降低。这些性能似乎是高效环化聚合过程的直接结果。转化率提高且收缩减小的综合特性使这些单体成为牙科树脂复合材料的理想候选材料。对其在该应用中的潜力进行的初步评估表明，具有合适的酯官能度时，它们可以被配制成具有优异机械强度性能的复合材料。
