Low‐weight fractions of graphene and hydroxyapatite enhance mechanics in photocured methacrylate adhesives
Low‐weight fractions of graphene and hydroxyapatite enhance mechanics in photocured methacrylate adhesives
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DOI：
10.1002/app.50442
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发表时间：
2021-01
影响因子：
3
通讯作者：
Zinah N. Alabdali;E. Irizarry;M. Reiter;A. Ashraf;J. Lynch-Branzoi;A. Mann
中科院分区：
文献类型：
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作者：
Zinah N. Alabdali;E. Irizarry;M. Reiter;A. Ashraf;J. Lynch-Branzoi;A. Mann
在许多应用中，希望光固化粘合剂在固化状态下具有高机械强度，但在液态时具有相对较低的粘度。这是通过将少于 0.5 wt% 的羟基磷灰石和石墨烯添加到具有二氨基甲酸酯二甲基丙烯酸酯 (UDMA-MMA) 的甲基丙烯酸甲酯中来实现的。与单独的 UDMA-MMA 相比，纳米压痕显示硬度增加了 30-40%，压痕模量增加了 >30%。流变测定显示液态未固化粘度仅小幅增加。这些添加剂会影响光学性质、自由基迁移率、光固化和转化程度，其影响可以在傅里叶变换红外和显微拉曼光谱中看到。固化过程中拍摄的热成像图像显示添加剂影响光固化过程。此外，当存在添加剂时，在振动光谱中可以看到分子间键合的变化。机械性能的增强归因于观察到的光固化和粘合的变化。
In many applications, it is desirable for photocured adhesives to have high‐mechanical strength in the cured state, but relatively low viscosity when liquid. This was achieved by adding less than 0.5 wt% hydroxyapatite and graphene to methyl methacrylate with diurethane dimethacrylate (UDMA‐MMA). Nanoindentation shows hardness increasing by 30–40% and indentation modulus by >30% compared to UDMA‐MMA on its own. Rheometry shows only a small increase in uncured viscosity for the liquid state. The additives affect the optical properties, mobility of free radicals, photocuring, and degree of conversion, the effects of which are seen in Fourier transform infrared and micro‐Raman spectra. Thermographic images taken during curing show that the additives impact the photocuring process. In addition, changes in intermolecular bonding are seen in the vibrational spectra when the additives are present. The enhanced mechanical properties are attributed to the observed changes in photocuring and bonding.