Effects of low-energy electron beam irradiation on flexural properties of self-curing acrylic resin
Effects of low-energy electron beam irradiation on flexural properties of self-curing acrylic resin
复制标题
低能电子束辐照对自固化丙烯酸树脂弯曲性能的影响
DOI：
10.1016/j.jpor.2013.10.004
复制
发表时间：
2014
影响因子：
3.6
通讯作者：
Kouichi Watanabe
中科院分区：
文献类型：
--
作者：
Kyosuke Ito;Akiko Nomura;Shuichi Nomura;Kouichi Watanabe
目的：探讨LEB辐照聚合物粉末对改善自固化丙烯酸树脂力学性能的有效性。方法：采用25、50、75、100kGy四种剂量的LEB辐照自固化丙烯酸树脂粉末。未经辐照的粉末作为对照。经LEB照射后，进行ESR测定、重均相对分子质量测定和三点弯曲试验。结果：对照的ESR谱无峰。LEB辐照后，在每个ESR谱上观察到9个峰，表明主链上存在自由基。当剂量达到100kGy时，自由基数呈线性增加。校正后的重均分子量如下：对照组，960,000；25kGy500,000；50kGy440,000；75kGy410,000；和100kGy390,000。分子量随LEB辐照剂量的增加而减小。抗折强度分别为：对照组61.5±3.0；25kGy68.1±4.0；50kGy73.0±1.9；75kGy70.4±3.6；100kGy67.7±2.3。LEB辐照粉末固化的试件的弯曲强度显著高于对照组(p<；0.01)。这些结果表明，经LEB辐照的粉末固化的聚合物材料的弯曲强度增加，这是由于交联结构的增加。结论：证实了LEB辐照自固化丙烯酸树脂的聚合物粉末提高了弯曲强度。
Purpose: The purpose of this study was to confirm the effectiveness of LEB irradiation onto the polymer powder for improving the mechanical properties of self-curing acrylic resin.Methods: The polymer powder of self-curing acrylic resin was irradiated with total LEB doses of 25, 50, 75 or 100 kGy. Non-irradiated powder was used as a control. After LEB irradiation, ESR measurement, weight-average molecular weight measurement and three-point bending test were performed.Results: ESR spectrum of control had no peaks. After LEB irradiation, nine peaks were observed in each ESR spectrum, which indicates the presence of free radicals from main polymer chain. The quantity of free radicals increased linearly up to 100 kGy. Calibrated weight-average molecular weights were as follows: control, 960,000; 25 kGy, 500,000; 50 kGy, 440,000; 75 kGy, 410,000; and 100 kGy, 390,000. Molecular weight decreased with increasing LEB irradiation dose. The mean values of flexural strength (MPa) were as follows: control, 61.5±3.0; 25 kGy, 68.1±4.0; 50 kGy, 73.0±1.9; 75 kGy, 70.4±3.6; and 100 kGy, 67.7±2.3. The flexural strength of the specimens cured with the LEB-irradiated powder was significantly higher than that of control (p< 0.01). These results indicate that flexural strength of polymer materials cured with the LEB-irradiated powder increases because of increase in cross-linking structure.Conclusion: It is confirmed that LEB irradiation onto the polymer powder of self-curing acrylic resin improves the flexural strength.