环氧基硅烷改性氰酸酯树脂的性能研究

采用环氧基硅烷(ESi)对双酚A型二氰酸酯树脂(BCE)进行改性,研究了ESi用量对ESi/BCE体系力学性能和动态力学性能等影响。结果表明:适量的ESi可以明显提高BCE的韧性和强度;当w(ESi)=6%时,ESi/BCE改性体系的力学性能最好,其冲击强度和弯曲强度分别从10.1 kJ/m2、94.11 MPa提高到14.49 kJ/m2、110.94 MPa;ESi/BCE体系的交联密度降至适度是其韧性提高的主要原因,并且其玻璃化转变温度(Tg)低于纯BCE体系(但降幅不大)。     

铈盐和硅烷改性阳极氧化LY12铝合金的耐蚀性能

采用硫酸阳极氧化法在LY12铝合金表面制备了阳极氧化膜,然后以γ–环氧丙氧丙基三甲氧基硅烷(GPTMS)/正硅酸乙酯(TEOS)杂化溶胶封闭,并在封闭过程中引入Ce3+作为缓蚀剂。对吸附Ce3+的铝合金阳极氧化膜进行了X射线光电子能谱(XPS)分析。通过极化曲线与电化学阻抗谱(EIS)研究了铈盐和硅烷杂化溶胶改性的阳极氧化铝合金电极在25°C、3.5%(质量分数)NaCl溶液中的耐蚀长效性。结果表明,硅烷杂化溶胶封闭方法极大提高了阳极氧化膜的耐长期腐蚀性能。Ce3+在硅烷杂化溶胶封闭的阳极氧化膜体系中的引入方式不同导致其耐蚀长效性具有显著差异。吸附Ce3+后再经硅烷杂化溶胶封闭的阳极氧化膜电极的耐蚀性显著高于铈盐掺杂硅烷杂化溶胶封闭的阳极氧化膜。     

超高相对分子质量聚乙烯交联研究进展

超高相对分子质量聚乙烯(UHMWPE)因其优异的综合性能被广泛用于人工关节替代等材料中,但磨损现象一直是造成替代关节破坏而失效的最重要因素。近年来通过交联提高UHMWPE的耐磨性已成为学术界研究的一大热点。综述了UHMWPE在交联方面的最新研究成果。研究重点集中在通过各种射线辐照、化学方法、硅烷接枝获得UHMWPE的交联。     

硅烷在涂装前处理工艺中的神奇应用

在了解硅烷特性的基础上,推荐液相、气相和涂剂等3种涂装前硅烷表面处理工艺。介绍了硅烷处理技术在解决涂装前处理工艺的环保、节能减排、省资源和涂层难附着问题等方面的神奇功能及应用实例。     

天津市海滨大道桥梁防水技术介绍

详细介绍了地处滨海盐土区域的天津海滨大道桥梁工程所采取的防水防腐措施,包括浇筑钢筋混凝土时采用渗透性模板、箱粱混凝土表面涂刷硅烷憎水荆、桥面喷涂SBS改性沥青防水涂料等,对类似地质环境下的桥梁防水工程有参考意义.     

A Review of: “Interfacial Phenomena in Polymers,by Yuri S. Lipatov. Naukova Dumka Publ., Kiev, 1980, 259 pp. (in Russian).”

Bonding aluminum metal and its alloys with epoxy adhesives is sensitive to process variables, particularly surface contamination and moisture exposure. In the past, several surface modification schemes have been developed to improve the epoxy-bonding of aluminum. The present work describes a simple process that produces significant improvement in strength and durability of epoxy-bonded aluminum. In this process, aluminum surfaces are first rinsed with dilute sodium metasilicate solution followed by a dilute aqueous epoxysilane solution. The combination of the two materials exhibits a bond strength synergism as measured by bondline fracture toughness. The treated aluminum surface also exhibits a significant increase in bond strength tolerance to contamination and moisture exposure. The effect of epoxysilane chemical structure on bond durability was examined, as was the role of the silicate surface treatment.     

D4-丙烯酸酯水性胶粘剂的研制

研究了以ＯＰ－１０、十二烷基硫酸钠为乳化剂，以Ｋ２Ｓ２Ｏ８为引发剂，以八甲基环四硅氧烷（Ｄ４）与丙烯酸丁酯为主要单体，进行乳液聚合反应，制取水性胶粘剂。在固含量一定的前提下，通过正交试验确定了最佳粘结强度的条件。     

Influence of the Interphase on Impact Properties of Zirconium Silicate Filled High-Density Polyethylene

Yellow zirconium silicate is a promising substitute for cadmium pigments used in plastics. However, the incorporation of zircon pigment in HDPE without loss of impact strength is required. By introducing the untreated pigment in the polymer, the impact strength reduces to 60% of the value for the unfilled polymer. Different types of silane coupling agents were used to regain the impact strength of the composite. Octadecylsilane acted as a wetting agent rather than as a coupling agent. The impact strength hardly improved. A vinyl functional and a methacryloxy functional silane improved the impact strength to 70% relative to the unfilled polymer. The physically bonded, interdiffused network formed by silane and polymer improves the impact strength by the flexible nature of the interphase. An azidosilane improved the impact strength only to 73%: the interphase bonded covalently to the polymer as well as to the filler, in that way improving the impact strength, but behaving as a brittle system. A relatively thick, flexible interphase bonded covalently to filler and polymer was created. This interphase improved the impact strength to the value of the unfilled polymer.     

SiH4辉光放电的质谱研究

本文报道了采用四极质谱计在制备ａＳｉ∶Ｈ薄膜的ＰＣＶＤ系统中对ＳｉＨ４射频辉光放电进行在线的质谱研究。获取了在不同电离电压下的ＳｉＨ４质谱和不同辉光放电功率下的ＳｉＨ４质谱。     

Studies on the reaction mechanism between urushiol and organic silane

A lacquer hybridized with an organic silane compound has been synthesized, and the reaction mechanism between the urushiol and organic silane has been evaluated based on IR, NMR, TGA, and DSC measurements.