Nanophase separation of polymers exposed to simulated bonding conditions.
Nanophase separation of polymers exposed to simulated bonding conditions.
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DOI：
10.1002/jbm.b.31047
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发表时间：
2009-02
影响因子：
3.4
通讯作者：
Spencer, Paulette
中科院分区：
文献类型：
--
作者：
Ye, Qiang;Wang, Yong;Spencer, Paulette
关键词：
在活体条件下，在牙本质粘结过程中，几乎不能控制牙齿上的水分。因此，可能会使牙本质表面变得非常潮湿，以至于粘结剂实际上会经历物理分离，形成疏水和亲水的富含相。利用敲击模式原子力显微镜/位相成像技术，在不同水浓度固化的HEMA/BISGMA牙本质粘结剂表面观察到具有蠕虫状特征的纳米相。随着初始胶粘剂中水浓度的增加，胶粘剂的相变明显，且随亲水/疏水组成比的不同而变化。不同大小的过饱和水滴可能在亲水和疏水聚合物相中以微孔的形式积累。通过乙醇刻蚀结合扫描电子显微镜/原子力显微镜技术，也确定了相结构域。
Under in vivo conditions, there is little control over the amount of water left on the tooth during dentin bonding. As a result, it is possible to leave the dentin surface so wet that the adhesive actually undergoes physical separation into hydrophobic- and hydrophilic-rich phases. Using tapping mode atomic force microscopy/PhaseImaging technique, nanosized phases with worm-like features were found on the surface of model HEMA/BisGMA dentin adhesives cured in the presence of varying concentrations of water. The phase contrast became evident with the increase of water concentration in the initial adhesive formulation and varied with the ratio of hydrophilic/hydrophobic composition. Oversaturated water droplets of variable sizes may accumulate as micro-voids within the hydrophilic and hydrophobic polymer phases. The phase domains were also identified following ethanol-etching in combination with SEM/AFM techniques.
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