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首页> 外文期刊>Journal of Applied Polymer Science >A study of localized curing of glass-filled composites using microhardness measurements
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A study of localized curing of glass-filled composites using microhardness measurements

机译：利用显微硬度测量研究玻璃填充复合材料的局部固化

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Extent of cure of hybrid composite systems is examined by conducting hardness measurements at different stages of the photopolymerization reaction and obtaining kinetic parameters that matched the experimental data. The materials are commercial dental composites based on bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane resins with different photoinitiator concentrations as well as filler particle sizes and combinations. Samples (five per group) were made using nylon molds (2.5 x 5 mm) of the tested composites. The samples were light cured with a constant-power light source for durations up to 20 s. After curing, all samples underwent Vicker's hardness testing of top and bottom surfaces. While there are significant differences in the polymerization behavior between the top and bottom locations for the tested composites, the corresponding growth exponent n, a kinetic parameter in the kinetic theory, is very close in all cases. For the tested materials the coefficient factor k is much lower for the bottom surfaces compared with the top surfaces. This reduction in the value of k is more severe for the material with a higher concentration of the photoinitiator as well as a higher percentage of glass filler particles in the wavelength range affecting the photopolymerization. It is argued that a relationship between k and the irradiation intensity can be used to quantify the decay of irradiated light with its penetration into the composites. The comparisons can be used to draw preliminary conclusions on the parameters controlling the effective depth of cure in a hybrid composite. © 2005 Wiley Periodicals, Inc.
机译：通过在光聚合反应的不同阶段进行硬度测量并获得与实验数据相匹配的动力学参数，可以检查混合复合体系的固化程度。该材料是基于具有不同光引发剂浓度以及填料粒度和组合的双[4-（2-羟基-3-甲基丙烯酰氧基丙氧基）苯基]丙烷树脂的商业牙科复合材料。使用被测复合材料的尼龙模具（2.5 x 5 mm）制成样品（每组五个）。使用恒功率光源将样品光固化长达20 s。固化后，所有样品都要经受维克氏硬度测试。尽管测试复合材料的顶部和底部位置之间的聚合行为存在显着差异，但在所有情况下，相应的生长指数n（动力学理论中的动力学参数）都非常接近。对于被测材料，底面的系数因子k比顶面低得多。对于具有较高光引发剂浓度以及在影响光聚合作用的波长范围内具有较高百分比的玻璃填料颗粒的材料，k值的这种降低更为严重。有人认为，k和辐照强度之间的关系可以用来量化辐照光穿透到复合物中的衰减。这些比较可用于就控制混合复合材料中有效固化深度的参数得出初步结论。 ＆复制; 2005 Wiley期刊公司

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