Analysis of chemical interaction of 4-MET with hydroxyapatite using XPS
Analysis of chemical interaction of 4-MET with hydroxyapatite using XPS
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DOI：
10.4012/dmj.25.645
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发表时间：
2006-12-01
影响因子：
2.5
通讯作者：
Okazaki, Masayuki
中科院分区：
文献类型：
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作者：
Nagakane, Kouji;Yoshida, Yasuhiro;Okazaki, Masayuki
每种牙科粘合剂都含有特定的功能单体，决定其对牙齿组织的实际粘合性能。4-甲基丙烯酰氧基乙基偏苯三酸（4-MET）是众所周知的最常用的官能单体之一，因此广泛用于商业粘合剂中。因此，我们使用X射线光电子能谱（XPS）表征了4-MET与羟基磷灰石（HAp）的化学相互作用。XPS分析表明，当4-MET吸附到HAp上时，代表4-MET的-COO-峰向较低的结合能移动。该位移峰的去卷积揭示了两个组分，一个峰代表未反应的羧基和酯基，另一个峰表明其他羧基与HAp的Ca化学键合。用4-MET处理的HAp的XPS光谱还揭示了表面富集钙而减少磷，表明磷以比钙相对更高的速率被提取。因此可以得出结论，如使用XPS所证明的，发生了4-MET与HAp中存在的钙的真正化学键合。
Each dental adhesive contains a specific functional monomer that determines its actual adhesive performance to tooth tissue. 4-methacryloxyethyl trimellitic acid (4-MET) is well-known as one of the functional monomers mostly available and consequently widely used in commercial adhesives. We therefore characterized the chemical - interaction of 4-MET with hydroxy-apatite (HAp) using X-ray Photoelectron Spectroscopy (XPS). XPS revealed that the peak representing -COO- of 4-MET shifted to a lower binding energy, when 4-MET was adsorbed onto HAp. Deconvolution of this shifted peak disclosed two components with a peak representing unreacted carboxyl groups and ester groups, and a peak suggesting chemical bonding of other carboxyl groups to Ca of HAp. XPS spectra of HAp treated with 4-MET also disclosed the surface to be enriched in calcium and decreased in phosphorus, indicating that phosphorus was extracted at a, relatively higher rate than calcium. It can thus be concluded that true chemical bonding of 4-MET with calcium present in HAp occurred, as it was proven using XPS.