Formability of thermally cured and of nanoclay-reinforced polyelectrolyte films on NiTi substrates
Formability of thermally cured and of nanoclay-reinforced polyelectrolyte films on NiTi substrates
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NiTi 基底上热固化和纳米粘土增强聚电解质膜的可成型性
DOI：
10.1007/s10853-011-5782-3
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发表时间：
--
影响因子：
4.5
通讯作者：
H.J. Maier
中科院分区：
文献类型：
--
作者：
J. Lackmann;T. Niendorf;M. Maxisch;R. Regenspurger;G. Grundmeier;H.J. Maier
本研究表征了通过固化改性和纳米粘土片交替增强的聚电解质薄膜的可成形性。为了研究改性聚电解质涂层在生物医学上的适用性，我们在多晶和单晶NiTi 50.9 at上涂膜。在循环拉伸载荷下，基材在模拟体液（汉克溶液）中发生机械变形。采用原位电子背散射衍射、原位共聚焦激光扫描显微镜、光弹调制红外反射吸收光谱和椭偏测量等方法研究了缺陷的形成。根据在力学测试前后对衬底和薄膜的观察，拉伸循环过程中缺陷的形成与衬底和薄膜的特性有关。特别是在多晶和单晶衬底上未改性和固化的聚电解质薄膜中，在明显的地形变化区域内，出现了缺陷。相比之下，纳米粘土改性涂层仍然没有缺陷，表明成形性得到了显着改善，这可能与聚电解质基体内增强的粘土血小板有关。
The present study characterizes the formability of thin polyelectrolyte films which were modified by curing and alternatively reinforced with nano-sized clay-platelets. To investigate the suitability of modified polyelectrolyte coatings for biomedical applications, films were applied on both the polycrystalline and single crystal NiTi 50.9 at.% substrates and mechanically deformed in simulated body fluid (Hank’s solution) under cyclic tensile loading. In situ electron backscatter diffraction, in situ confocal laser scanning microscopy, photoelastic-modulated infrared reflection absorption spectroscopy, and ellipsometry measurements were employed to study defect formation. Based on observations from the substrates and films, conducted before and after to mechanical testing, defect formation during tensile cycling was related to substrate and film characteristics. Defects emerged particularly in unmodified and cured polyelectrolyte films on both polycrystalline and single crystalline substrates within areas of pronounced topographic changes. In contrast, the nanoclay-modified coatings remained defect free, indicating a remarkable improvement of formability, which can be related to the reinforcing clay-platelets within the polyelectrolyte matrix.
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