Electrophoretic deposition of polyetheretherketone (PEEK) and PEEK/Bioglass® coatings on NiTi shape memory alloy wires
Electrophoretic deposition of polyetheretherketone (PEEK) and PEEK/Bioglass® coatings on NiTi shape memory alloy wires
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DOI：
10.1007/s10853-006-0556-z
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发表时间：
2006-12-01
影响因子：
4.5
通讯作者：
Minay, E. J.
中科院分区：
文献类型：
--
作者：
Boccaccini, A. R.;Peters, C.;Minay, E. J.
采用电泳法在形状记忆合金(NiTi、NiTiol(R))丝材上制备了聚醚醚酮(PEEK)涂层和PEEK/Bioglass(R)涂层。PEEK粉末在乙醇中的悬浮液(1-6wt%)、沉积时间为5分钟、外加电压为20伏时，效果最佳。使用这些参数的EPD可获得高质量的PEEK涂层，沿导线长度具有均匀的微结构，厚度均一，最大可达15微米，没有裂纹或大空洞的存在。将PEEK粉末悬浮在乙醇中，添加Bioglass(R)颗粒(0.5-2wt%)(尺寸为5微米)，制备PEEK/Bioglass(R)涂层。为了使涂层致密化并提高涂层与基材的附着力，将烧结作为一种后处理工艺进行。当烧结温度为340℃、烧结时间为20min、升温速率为300℃/h时，可获得均匀致密、无裂纹的PEEK和PEEK/Bioglass(R)涂层。通过在无细胞模拟体液(SBF)中浸泡两周，研究了聚醚醚酮/Bioglass(R)复合涂层的生物活性行为。不出所料，在SBF中浸泡1周后，涂层表面形成了羟基磷灰石晶体，证实了涂层的生物活性。结果首次证明，EPD是一种非常方便的方法，可以在用于生物医学应用的Nitinol(R)线材上获得均匀和均匀的生物活性PEEK和PEEK/Bioglass(R)涂层。
Polyetheretherketone (PEEK) and PEEK/Bioglass (R) coatings were produced on shape memory alloy (NiTi, Nitinol (R)) wires using electrophoretic deposition (EPD). Best results were achieved with suspensions of PEEK powders in ethanol in the range (1-6 wt%), using a deposition time of 5 minutes and applied voltage of 20 Volts. EPD using these parameters led to high quality PEEK coatings with a homogeneous microstructure along the wire length and a uniform thickness of up to 15 mu m without development of cracks or the presence of large voids. Suspensions of PEEK powders in ethanol with addition of Bioglass (R) particles (0.5-2 wt%) (size < 5 mu m) were used to produce PEEK/Bioglass (R) coatings. Sintering was carried out as a post EPD process in order to densify the coatings and to improve the adhesion of the coatings to the substrate. The sintering temperature was 340 degrees C, sintering time 20 min and heating rate 300 degrees C/h. Sintering led to uniform and dense PEEK and PEEK/Bioglass (R) coatings without any cracks. The bioactive behaviour of PEEK/Bioglass (R) composite coatings was investigated by immersion in acellular simulated body fluid (SBF) for up to two weeks. As expected, hydroxyapatite crystals formed on the surface of the coated wires after 1 week in SBF, confirming the bioactive character of the coatings. The results have demonstrated for the first time that EPD is a very convenient method to obtain homogeneous and uniform bioactive PEEK and PEEK/Bioglass (R) coatings on Nitinol (R) wires for biomedical applications.