硅烷反应时间对纳米复合材料摩擦化学修复的影响。

R. Pilo, T. Brosh, Valery Geron, S. Levartovsky, G. Eliades
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引用次数: 15

摘要

目的研究硅烷反应时间对老化纳米填充复合材料修复强度的影响,并表征其键合机理。材料与方法纳米填充的复合圆盘(n = 110, Filtek Supreme XT)在水中陈化90 d。经过摩擦化学处理(CoJet-Sand)后,将样品分为5组(n = 22),分别涂上硅烷(Espe-Sil),反应1、2、3、4和5分钟。涂上一层薄胶粘剂(visao - bond),并放置相同尺寸的新复合材料并固化。未老化的标本立即分层和固化使用增量技术作为对照。老化后(水中30天+ 5000次热循环),界面受到剪切力作用直至破坏。在体视显微镜和扫描电镜(SEM)下评估失效模式。使用SEM/EDX和ATR-FTIR对其他老化和处理过的表面进行形貌以及元素和分子组成的评估。结果修复标本的剪切强度(SBS)平均为53.9±8.6 MPa,不同反应时间间差异无统计学意义,但明显低于对照组(88.1±12.5 MPa)。摩擦化学处理产生了不规则的表面形态,颗粒嵌入在老化的表面。界面SEM/EDX分析显示在5 μm的非均匀高原子序数区富含Al和Si。结论短硅烷反应时间(1 min)与长反应时间(2 ~ 5 min)的摩擦化学处理修复复合材料的效果相同,产生的界面剪切强度约为未修复材料的60%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Silane Reaction Time on the Repair of a Nanofilled Composite Using Tribochemical Treatment.
PURPOSE To investigate the influence of silane reaction time on the repair strength of an aged nanofilled composite and to characterize the bonding mechanism. MATERIALS AND METHODS Nanofilled composite disks (n = 110, Filtek Supreme XT) were aged for 90 days in water. After tribochemical treatment (CoJet-Sand), the specimens were assigned to 5 groups (n = 22), primed with silane (Espe-Sil), and left to react for 1, 2, 3, 4, and 5 min. A thin layer of adhesive (Visio-Bond) was applied and a new composite with the same dimension was placed and cured. Non-aged specimens immediately layered and cured using the incremental technique served as controls. After aging (30 days in water plus 5000 thermal cycles), the interface was subjected to a shearing force until failure. Failure mode was evaluated under a stereomicroscope and scanning electron microscopy (SEM). Additional aged and treated surfaces were evaluated for morphology as well as elemental and molecular composition using SEM/EDX and ATR-FTIR. RESULTS The mean shear bond strength (SBS) of the repaired specimens was 53.9 ± 8.6 MPa, with no significant difference among the various reaction times, but significantly lower compared to the control (88.1 ± 12.5 MPa). Tribochemical treatment created an irregular surface morphology with particles imbedded in the aged surface. Interfacial SEM/EDX analysis showed a 5-μm non-uniform high atomic number zone rich in Al and Si. CONCLUSION Tribochemical treatments for repairing composite using a short silane reaction period (1 min) are equally effective as the prolonged reaction periods (2 to 5 min), yielding interfacial shear strength of ~60% of unrepaired material.
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