一种可聚合光引发体系及其性能研究

合成了一种可聚合双分子光引发体系——甲基丙烯酸-4-二苯酮甲酯(BPMM)光引发剂和甲基丙烯酸-3,4-亚甲基二氧基苯甲酯(MDBMM)助引发剂.采用含有水平样品支架的实时红外光谱仪(RTIR)监测光聚合动力学,动态力学分析仪(DMA)研究固化膜的机械性能.结果表明,聚合体系的聚合速率(Rp)和最终双键转化率(Pf)随MDBMM浓度的增加而增加,但是,随BPMM的浓度变化出现一最佳值(0.8%);相同的聚合条件下,与传统引发体系相比,BPMM/MDBMM虽然引发活性较差,但是其固化膜的Pf和玻璃化转变温度以及在37℃左右的储能模量与传统引发体系相近,并且MDBMM作为天然可食用植物化学成分衍生物的特点使其有可能适宜于在生物相容性要求较高的领域中应用.

A POLYMERIZABLE PHOTOINITIATING SYSTEM AND ITS PERFORMANCE

4-Benzophenone methoxyl methacrylate(BPMM) and 3,4-methylenedioxybenzene methoxyl methacrylate(MDBMM) were synthesized and the photoinitiating effect of BPMM/MDBMM combinations was evaluated as well.Real time infrared spectroscopy(RTIR) with a horizontal sample holder was used to record the polymerization kinetics of UDMA/TEGDMA(70/30 W/W) initiated by BPMM/MDBMM.Dynamic mechanical analyzer(DMA) was used to study the mechanical properties of the cured samples.The results showed that,with increasing of the amount of MDBMM,the rate of polymerization (R_p) and final double bond conversion(P~f) increased.However,with the increase of BPMM concentrations,an optimum BPMM concentration occurred(0.8%).Comparison with the conventional BP/EDMAB initiator system under the same curing conditions indicates that BPMM/MDBMM shows a lower initiating reactivity,but a comparable P~f,T_g and the storage modulus around 37℃ of the products.Moreover,as a derivative of natural component from black peppers MDBMM is more promising in biomedical applications.