Miyazaki K, Horibe T
Department of Dental Materials and Devices, Fukuoka Dental College, Japan.
J Biomed Mater Res. 1988 Nov;22(11):1011-22. doi: 10.1002/jbm.820221105.
The cross-linking reaction of 15 dimethacrylates, one trimethacrylate and five diacrylates was studied by means of differential scanning calorimetry (DSC) and high performance liquid chromatography (HPLC) to investigate the relationship between the polymerization characteristics and the chemical structure of these monomers. The amount of pendant double bonds (Dp) and the efficiency of cross-linking (Ec) were calculated from both the extent of polymerization (Ep) and the amount of residual monomer (Rm) obtained by DSC and HPLC analyses, respectively. The Ep and Ec values of various monomers increased with an increase in the number of chain members between the functional groups, while Rm and Dp values decreased. The dimethacrylates consisting of aliphatic chains polymerized more readily than those containing aromatic units. High Ep was obtained in the aliphatic dimethacrylates and diacrylates with more than eight chain members and the aromatic dimethacrylates with more than 20 chain members among the monomers examined. These results depend presumably on the flexibility of the functional groups in the polymer network. With most dimethacrylates and diacrylates, high Ep was also observed in thermal scanning polymerization compared to isothermal polymerization at 90 degrees C. The diacrylates showed a high rate of polymerization compared to the corresponding dimethacrylates.
通过差示扫描量热法（DSC）和高效液相色谱法（HPLC）研究了15种二甲基丙烯酸酯、1种三甲基丙烯酸酯和5种二丙烯酸酯的交联反应，以研究这些单体的聚合特性与化学结构之间的关系。分别根据DSC和HPLC分析得到的聚合程度（Ep）和残留单体量（Rm）计算侧链双键量（Dp）和交联效率（Ec）。各种单体的Ep和Ec值随着官能团之间链节数的增加而增加，而Rm和Dp值则降低。由脂肪族链组成的二甲基丙烯酸酯比含有芳环单元的二甲基丙烯酸酯更容易聚合。在所研究的单体中，具有八个以上链节的脂肪族二甲基丙烯酸酯和二丙烯酸酯以及具有20个以上链节的芳族二甲基丙烯酸酯获得了高Ep。这些结果可能取决于聚合物网络中官能团的柔韧性。对于大多数二甲基丙烯酸酯和二丙烯酸酯，与90℃等温聚合相比，热扫描聚合中也观察到高Ep。与相应的二甲基丙烯酸酯相比，二丙烯酸酯显示出高聚合速率。
