Effect of initiator on photopolymerization of acidic, aqueous dental model adhesives
Effect of initiator on photopolymerization of acidic, aqueous dental model adhesives
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DOI：
10.1002/jbm.a.32185
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发表时间：
2009-09-15
影响因子：
4.9
通讯作者：
Wang, Yong
中科院分区：
文献类型：
--
作者：
Guo, Xinglin;Peng, Zhonghua;Wang, Yong
本研究以樟脑酚(CQ)或[3-(3，4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-2-hydroxylpropy]三甲基氯化铵(QTX)为光引发剂(染料)，对不同引发体系在自酸蚀模型胶粘剂中的应用进行了研究。以N-苯甘氨酸(NPG)、4-二甲氨基苯甲酸乙酯(4E)或甲基丙烯酸二甲氨基乙酯(DMAEMA)为共引发剂(CI)。研究了六氟磷酸二苯锂(DPIHP)在聚合过程中的作用。模型胶粘剂中染料、CI和DPIHP的浓度均保持在每克单体0.022 mm o l。该模型胶粘剂含有两种单体：双[2-(甲基丙烯酰氧基)乙基]磷酸)(2MP)和甲基丙烯酸羟乙酯(HEMA)，质量比为1：1，表现出酸性和亲水性。用FTIR/ATR和时间光谱分析测定了含水率为5%、15%和25%的模型胶粘剂的聚合速率和转化率(DC)。结果表明，以CQ为光引发剂时，4E似乎是最有效的CI，而CQ-DMAEMA的组合导致很低的自由基产生效率(DC<；5%)。DPIHP对聚合过程影响不大。然而，在QTX作为光引发剂的情况下，DPIHP发挥了至关重要的作用。在没有DPIHP的情况下，三种QTX-CI体系均无法引发聚合(DC<；5%)。另一方面，QTX-DPIHP组合被发现是一种可行的引发体系。上述结果为自酸蚀粘接剂体系的开发提供了重要信息。(C)2008 Wiley期刊，Inc.《生物医学杂志》90A：1120-1127,2009
This study evaluated different initiator systems in self-etching model adhesives, in which camphorquinone (CQ) or [3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-2-hydroxylpropy] trimethylammonium chloride (QTX) was employed as a photoinitiator (dye). N-phenylglycine (NPG), ethyl 4-dimethylaminobenzoate (4E) or 2-(dimethylamino) ethyl methacrylate (DMAEMA) was used as the coinitiator (CI). The role of diphenyliodonium hexafluorophosphate (DPIHP) in the polymerization process was also studied. The concentrations of dye, CI, and DPIHP in model adhesives were all maintained at 0.022 mmol per gram monomer. The model adhesive contained two monomers: (bis[2-(methacryloyloxy)ethyl] phosphate) (2MP) and 2-hydroxyethyl methacrylate (HEMA) whose mass ratio was 1:1, thus representing an acidic and hydrophilic formulation. The polymerization rate and the degree of conversion (DC) of the model adhesives with 5, 15, or 25% water content were determined using FTIR/ATR with a time-based spectrum analysis. The results indicated that with CQ as the photoinitiator, 4E appeared to be the most efficient CI, whereas the CQ-DMAEMA combination led to very low radical generation efficiency (DC < 5%). DPIHP exhibited little effect on the polymerization process. With QTX as the photoinitiator, however, DPIHP played an essential role. Without DPIHP, all three QTX-CI systems failed to initiate polymerization (DC < 5%). The QTX-DPIHP combination, on the other hand, was found to be a viable initiator system. The above results provide the critical information for the development of self-etching adhesive systems. (C) 2008 Wiley Periodicals, Inc. J Biomed Mater Res 90A: 1120-1127, 2009