Improvement of water resistance of bonding agents applying poly(fluoro)alkitrimethoxysilane for dental use

为了提高聚硅氧烷在有机硅树脂界面的耐水性，将3-甲基丙烯氧基丙基三甲氧基硅烷(3-MPS)和几种不同比例的疏水聚(氟)烷基三甲氧基硅烷按不同比例涂覆在玻璃板上，结果表明：3-MPS与烷基含碳数为4或6的聚(氟)烷基三甲氧基硅烷的混合物处理的样品的拉伸粘结强度显著高于3-MPS处理的样品。即使在浸泡和热应力作用下，样品仍表现出优异的耐水性。可以认为，样品优异的耐水性是由于引入了疏水的聚氟烷基。然而，其抗拉结合强度高的原因一直没有解决。研究了键合单体与键合单体的接触角、硅烷混合物处理的玻璃表面、表面微量氟的EPMA测定以及聚氟烷基的链长和烷基的变化与拉伸粘结强度的关系，认为可能是由于键合单体与硅烷混合物表面亲和力的增加和双官能团组成的键合单体的相互渗透聚合所致。

To improve the water resistance of the polysiloxane at the silca-resin interface, a mixture of 3-methacryoxypropyltrimethoxysilane( 3-MPS )and several hydrophobic poly (fluoro)alkyltrimethoxysilanes at various ratio was applied on a glass plate.The results were as follows :The tensile bond strength of the specimen treated with the mixture of 3-MPS and poly (fluoro)alkyltrimethoxysilanes with alkle group containing 4 or 6 carbon number was siginificantly high compared with that of 3-MPS treated specimen. And the specimen demonstrated excellent water-resistance even after immersion and thermal stress.It may be considered that the excellent water-resistance of the specimen was due to the introduction of hydrophobic poly (fluoro)alkyl group. However, the cause of its high tensile bond strength has been left unsolved. To make clear the cause, the contact angle against the bonding monomer, the surface of the glass treated with the silane mixture, the determination of trace of fluorine on the surface by EPMA, and the relationship between the tensile bond strength and the chain length of the poly (fluoro)alkyl group and the variety of alkyl group were studied.As a result, it was thought that cause may be due to the increase of affinity of the bonding monomer to the surface treated with the silane mixture and the interpenetration of followed by polymerization of bonding monomer composed of bisfunctional dimethacylate.