Synthesis of TiO2 Hybrid Molecular Imprinted Nanospheres Linked by Silane Coupling Agent

This article presents work on designing TiO₂ hybrid MIP nanospheres via precipitation polymerization using methacrylic acid (MAA) as functional monomer and silane coupling agent 3-(trimethoxysilyl) propylmethacrylate (KH570) as organic–inorganic connective bridge. Hydrogen bond was proved to act between MAA and template bensulfuron-methyl (BSM) for pre- and post-polymerization as testified by infrared spectrometry (IR). Scanning electron microscope (SEM), transmission electron microscope (TEM) and the adsorption kinetics experiments as well as IR were employed for characterization. The results indicated that the TiO₂ hybrid MIP nanospheres revealed a more irregular shape and smaller average size compared to organic-only MIP nanospheres. Furthermore, faster adsorption kinetics was achieved, which made it promising in chemical sensor applications.     

硅烷偶联剂的偶联作用机理及其在密封胶中的应用

硅烷偶联剂作为一种重要助剂,在密封胶、胶黏剂、金属防腐及涂料等领域都有广泛的应用。综述了硅烷偶联剂的偶联作用机理,包括化学键合理论、变形层及拘束层理论、摩擦层理论及应力松弛假说等。介绍了硅烷偶联剂在密封胶领域的几种典型应用方法,主要包括基材表面的底涂、填料颗粒的表面改性及作为助剂与基础聚合物共混等。讨论了不同使用条件下影响硅烷偶联剂使用效果的因素,并对硅烷偶联剂的发展进行了展望。     

硅烷偶联剂对晶须的表面处理及应用

介绍了硅烷偶联剂的种类、作用机理及应用。研究了用偶联剂处理过的晶须填充的PP和尼龙 66的力学性能     

Surface Functional Imprinting of Bensulfuron-methyl at Surface of Silica Nanoparticles Linked by Silane Coupling Agent

This article presents work on designing surface-imprinted core-shell nanoparticles via non-covalent interactions using bensulfuron-methyl (BSM) as the template and methacrylic acid as the functional monomer. About 3-(Trimethoxysilyl) propylmethacrylate (KH-570) functionalized SiO₂ nanoparticles were produced by sonochemical reaction. The grafting copolymerization of methacrylic acid and ethylene glycol dimethacrylate at the surface of KH-570 functionalized SiO₂ nanoparticles and in the presence of BSM as the template led to the formation of surface-imprinted core-shell nanoparticles. The core-shell nanoparticles were characterized, and their capacity to rebind BSM was analyzed. Results showed that the surface-imprinted core-shell nanoparticles binded the original template BSM with an appreciable selectivity over structurally related compounds. Compared to traditional imprinted particles, the density of effective imprinted sites in the nanoshells has been increased by four folds.     

硅烷偶联剂对HDPE/木粉复合材料性能的影响

使用经硅烷偶联剂HP-172和HP-174改性的木粉制备了HDPE/木粉复合材料,研究了偶联剂用量对其性能的影响。实验结果表明:当使用1.5%的HP-172处理木粉后,可使复合材料的各项力学性能提高30%以上;HP-174的用量为1%~1.5%也得到了较好的改性效果。通过FIR和SEM分析发现,硅烷偶联剂可与木粉表面发生化学反应,从而提高了HDPE与木粉的界面粘合强度,使复合材料的力学性能得以提高     

硅烷偶联剂对聚苯胺/Fe_3O_4复合材料结构与性能的影响

利用原位复合法制备了聚苯胺(PANI/)/Fe3O4复合材料,运用紫外光谱、扫描电镜、四探针电阻率仪等测试方法研究了硅烷偶联剂KH-550对PANI/Fe3O4复合材料结构及性能的影响。结果表明:经KH-550处理后的PANI/Fe3O4复合材料的微粒不易团聚,其电导率比未经处理的PANI/Fe3O4复合材料高约1个数量级,且随热处理温度的升高,复合材料的电导率降低,由半导体变为绝缘体;KH-550影响PANI与Fe3O4之间的电荷作用,使复合材料的紫外光谱特征吸收峰产生了一定的位移。     

功能性硅烷偶联剂在涂料中的应用

介绍了功能性硅烷偶联剂的结构与品种,较详细介绍了它们在附着力促进剂、无铬表面活性荆、“耐指纹”涂料,以及在无机纳米材料表面修饰中的应用。     

新型硅烷偶联剂的合成及其防腐性能初探

介绍了一种新型硅烷偶联剂3-(三甲氧基硅基)丙酸环氧丙酯(以下简称为GMAS)的合成,对其结构进行了1HNMR、13C NMR及FT-IR表征,初步探索了其用于镀锌板与铝板表面处理的防腐性能,通过全反射红外法研究GMAS与铝板结合的模式。总之,GMAS有作为铝板表面处理剂的应用前景。     

硅烷偶联剂对龙岩高岭土表面改性的研究

采用硅烷偶联剂KH-540对龙岩高岭土进行表面改性处理,研究了偶联剂的用量、表面改性处理的pH值、改性温度、反应时间等因素对高岭土活化指数的影响。以高岭土在液体石蜡中的沉降体积和红外光谱（FT-IR）等手段研究了改性效果以及改性剂与高岭土之间的相互作用。结果表明,改性的最佳实验条件为：偶联剂用量为2%左右,改性pH在8～10,改性温度为60℃,反应时间40 min。高岭土经过活化处理后,在液体石蜡中的分散性和稳定性均得到明显提高;偶联剂与高岭土之间以化学键合作用为主。     

硅烷偶联剂KH-560改性纳米二氧化硅

用硅烷偶联剂KH-560对纳米SiO2样品表面进行接枝改性研究.考察了纳米SiO2的用量、KH-560百分含量、改性温度以及改性时间对改性效果的影响.采用红外光谱、热重分析手段对表面改性前后的纳米SiO2进行表征.纳米SiO2最佳工艺改性条件:纳米SiO2用量4％,KH-560百分含量2％,改性温度90℃C,改性时间6...     

硅烷偶联剂原位改性白炭黑填充氢化丁腈橡胶（HNBR）复合材料性能研究

研究对比了硅烷偶联剂常温处理和原位改性白炭黑填充HNBR胶料性能,并进一步探索了不同种类的硅烷偶联剂原位改性白炭黑对HNBR复合材料性能的影响。结果表明,硅烷偶联剂原位改性白炭黑填充HNBR胶料的门尼粘度低、拉伸强度高、分散效果好和压缩永久变形小。使用硅烷偶联剂A151原位改性的HNBR胶料的门尼粘度较低,压缩永久变形最小。     

硅烷偶联剂改性芳纶的性能测试

采用硅烷偶联剂对芳纶进行改性,然后用傅里叶红外光谱仪、单一纤维接触角测试仪和X射线衍射仪对改性前后的芳纶进行测试、观察并分析。结果显示:红外光谱分析表明芳纶的改性发生在纤维的表面,并没有对纤维大分子产生明显破坏;接触角测试表明改性后芳纶的接触角变小,说明KH550硅烷偶联剂可改善芳纶的亲水性;X射线衍射测试表明芳纶结晶度有所下降,可以更好地与树脂黏结。     

Synthesis of TiO<Subscript>2</Subscript> nanoparticles from sprayed droplets of titanium tetrachloride by the gas-phase detonation method

Nanostructured polycrystalline titanium dioxides are produced by gas-phase detonation and pyrohydrolysis. Titanium tetrachloride (TiCl₄) is used as a precursor in the gas phase, and a premixed gas (O₂ and H₂) is used as a source of energy. The product is a mixture of TiO₂ crystals in the rutile phase (80%) and anatase phase (20%). __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 5, pp. 112–116, September–October, 2008.     

新型硅烷偶联剂的合成及其对有机硅密封胶性能的影响

合成出两种含氰基和仲胺基的新型硅烷偶联剂,分别用IR、1H-NMR和元素分析对其产物结构进行了表征.研究了添加新型硅烷偶联剂对有机硅密封胶力学性能、粘接性能以及表面可修饰性的影响,并与传统的硅烷偶联剂进行了对比.结果表明,在有机硅密封胶的制备配方中,适量添加该种新型硅烷偶联剂,可显著加快其交联速率,并大幅度提高力学性能以及对混凝土、玻璃、铝的粘接强度.同时可显著改善有机硅密封胶的表面可修饰性.力学性能的提高可用交联密度和分子间作用力来解释,而粘接性能和可涂覆性的改善则归因于极性氰基的作用.     

硅烷偶联剂改性丙烯酸酯乳液的合成及表征

针对纯丙乳液耐水性差的问题,将阴离子、非离子、反应型乳化剂进行复配,分别引入γ-(甲基丙烯酰氧)丙基三甲氧基硅烷和乙烯基三甲氧基硅烷2种硅烷偶联剂,制备了四元共聚的具有交联结构的纯丙乳液,通过FT-IR、TEM对乳胶粒的结构进行了表征。结果表明:2种偶联剂的最合适用量都为1%,乳液最低吸水率为1.4%,吸水率降低效果明显。     

点击化学法制备三硅型偶联剂及性能研究

以单硅型偶联剂巯丙基三甲氧基硅烷(MPS)、三烯丙基异氰脲酸酯(TI)为原料,使用2,2-二甲氧基-2-苯基苯乙酮为光引发剂,365 nm紫外光下反应获得了三硅型偶联剂(TI-MPS),产率94%。通过红外光谱、核磁谱图确定了产物结构。研究TI-MPS水解液在金属表面固化后的性能,结果表明,在马口铁片表面固化后的TIMPS膜层耐冲击大于100 cm·kg,耐弯曲1级,极化电阻为7 459.3Ω·cm2,各项性能均优于单硅型MPS膜层。盐雾加速腐蚀实验表明,TI-MPS防护性能明显优于MPS,在用于铝片的防护时可耐1 000 h盐雾腐蚀。     

Effect of Silane Coupling Agent on the Mechanical Properties of Clay Filled Styrene Butadiene Rubber

Abstract

The effect of treatment of coupling agent [Bis (3-triethoxy-silyl-propyl) tetrasulphide] on mechanical properties of composites made from styrene butadiene rubber and clay is reported in this paper. The coupling agent in the form of solution (1.0%) was used for treatment of the filler. The treatment resulted in enhancement of mechanical properties of composites when compared with composites containing untreated clay. The properties under consideration were tensile strength, modulus at 100% and 400%, Young's modulus, hardness, etc. Good reinforcement was observed due to treatment of 1% coupling agent. Tensile strength was improved by 11%, modulus at 400% was found to improve by 237%, elongation at break was improved by 250%, while Young's modulus also was improved by 298% for treated clay composites, respectively, at 0.41 volume fraction when compared with untreated clay composites.     

硅烷偶联剂/聚乙烯醇改性石膏的防水性能

以硅烷偶联剂A151和聚乙烯醇(PVA)为防水剂,研究石膏制品的防水性能.从微观形貌、接触角、石膏晶体表面的元素分布等方面,探讨其防水机理.结果表明,A151可以将亲水的石膏表面转变为憎水表面;PVA能在保留石膏制品质轻的同时,填充毛细孔,提高强度性能;两者复合使用可以显著提高石膏制品的防水性能.A151/PVA复合防水剂的制备工艺简单,并适用于非碱性环境,对石膏制品质轻的特性无明显影响.浸水2h后,试样的吸水率仅为0.9％,其湿强仍然是普通石膏制品干强的1.4倍.     

电导率法和红外光谱法分析硅烷试剂水解过程

1　前言　　金属表面的防腐研究已有多种防腐技术 ,例如 :电化学保护、电镀、化学镀、渗镀包镀、热喷涂及化学氧化膜法等。近期 ,国外学者提出了利用硅烷试剂(ＳｉｌａｎｅＡｇｅｎｔ,ＳＡ)与金属表面的氧化层形成化学键 ,来改变金属表面的性质[1],同时还具有无污染、处理件耐蚀性好、与涂层结合牢固等特点。一般ＳＡ首先水解反应生成硅醇 ,再起缩合脱水、缩合齐聚反应形成Ｓｉ-Ｏ -Ｍ (Ｍ为无机表面 )共价键和网状结构的膜覆盖在基材表面[2 ],这层膜具有抗外界酸、碱、盐等与金属反应的性质。不同ＳＡ的水解速度不同 ,因此溶剂及体系 ｐＨ…