硅烷偶联剂在异型材中使用浅析

采用一种含有硅烷偶联剂添加到门窗用异型材配方中，使无机填料与PVC等有机分子链有机键舍，形成较强的界面结合，结果表明：此硅烷偶联剂的加入，对无机填充剂的表面起到了一定的改性效果，使PVC型材的耐低温冲击性能、材料抗冲击强度、焊角强度等性能均有了一定程度的提高，还改良了加工过程中物料的塑化状况。     

硅烷偶联剂对玻纤改性PTFE复合材料性能的影响

采用冷压烧结工艺制备硅烷偶联剂对玻璃纤维改性PTFE复合材料.当固定玻璃纤维填充质量分数为20％时,研究了硅烷偶联剂添加量对复合材料拉伸强度、断裂伸长率、摩擦和磨损性能的影响,采用扫描电子显微镜观察复合材料摩擦前后表面形貌并分析磨损机理.结果表明,硅烷偶联剂能显著提高复合材料的拉伸强度和断裂伸长率.当硅烷偶联剂的质量分...     

硅烷偶联剂应用研究进展

概述了多种硅烷偶联剂在复合材料中的应用研究进展,及其他材料的应用研究进展。     

界面强度对玻璃纤维增强不饱和聚酯复合材料静态和动态力学性能影响

采用3种高强高模玻璃纤维与不饱和树脂,分别制备了3种单向板复合材料和3种织物复合材料,通过纤维束拔出法和韦布分析法表征了3种玻璃纤维与不饱和树脂间的界面结合强度,并研究了界面强度与复合材料静态和动态力学性能。结果表明:3种纤维的本征界面强度分别为27.12,34.91,35.60MPa;界面强度对复合材料静态力学与疲劳性能有着重要的影响,但对模量的影响较小。随着界面强度的增加,90°方向的拉伸强度逐渐增加,但是0°方向上的拉伸强度反而下降。当疲劳应变较低时,界面强度的增加有助于疲劳性能的提高;但当疲劳应变提高时,界面强度对疲劳性能的影响降低,与材料初始强度反而有着明显的相关性。     

硅烷偶联剂改性玻璃纤维增强硅气凝胶的研究

为了达到增强硅气凝胶力学性能的目的,采用硅烷偶联剂KH550与KH560二步改性接枝玻璃纤维,进而制备纤维增强硅气凝胶。利用扫描电子显微镜、红外光谱仪、比表面及孔径分布仪、热重-差热分析仪、导热系数仪、电子动静态疲劳试验机等对其表征。实验结果表明：硅烷偶联剂改性玻璃纤维与硅气凝胶复合后网络结构更加均匀、骨架强度更加稳定、孔径多在30 nm以下、具有良好的热稳定性;同时,改性玻璃纤维的最佳添加量为20%（质量分数）,此时其密度为0.167 g/cm³,导热系数为0.018 5 W/（m·K）,接触角为127°,抗弯强度为1.042 MPa,抗压强度为0.669 MPa,达到预期实验目的。     

基体树脂对长玻璃纤维增强PP力学性能的影响

采用在线混合设备制备了长玻璃纤维(LGF)增强聚丙烯(PP)复合材料(LGF-PP),研究了基体性质及界面相容剂对LGF-PP力学性能的影响。基体树脂熔体流动速率的增加,使最终LGF-PP中的玻璃纤维长度从5.63 mm增至8.56 mm,提高了力学性能。与均聚PP比较,以共聚PP为基体树脂的LGF-PP冲击强度高出约10%,但其他性能略差。界面相容剂有利于增强玻璃纤维与PP的界面结合,拉伸强度和拉伸模量明显增加,但是冲击强度降低了20%～30%。     

硅烷偶联剂对硅酮密封胶性能的影响

探讨了3种硅烷偶联剂与复配硅烷偶联剂对所制备硅酮密封胶性能的影响,包括：表干时间及固化深度、粘接性能、力学性能、热贮稳定性。其中,复配硅烷偶联剂对提高硅酮密封胶的以上性能效果显著,尤其是粘接性能。     

吸水对连续玻璃纤维增强聚丙烯复合材料的力学性能影响的研究

采用连续玻璃纤维增强聚丙烯(PP)预浸布制备复合材料层压板,通过人工加速老化的方法,对不同铺层的连续玻璃纤维增强PP复合材料进行常温、60℃、80℃的海水浸泡实验,研究连续玻璃纤维增强PP复合材料的弯曲强度随老化时间、老化温度等因素的变化规律及性能退化趋势。研究表明,老化初期吸水趋势符合菲克扩散,老化程度与时间和温度成正比关系。对试样断裂部分拍摄扫描电子显微镜(SEM)图像,观察不同环境条件下样品老化情况,老化温度越高、时间越长,增强纤维与树脂基体界面腐蚀越严重。     

硅烷偶联剂对二氧化硅填充硅橡胶界面及性能的影响

研究了硅烷偶联剂六甲基二硅氮烷（HMDS）、KH-570与Si O2增强体系在甲基乙烯基硅橡胶（MVQ）中的应用,同时考察了硅烷偶联剂的种类对MVQ复合材料界面及拉伸性能的影响。结果表明,Si O2经HMDS和KH-570表面处理后与MVQ的界面作用增强。相比于HMDS,含有KH-570的复合材料体系,Si O2能与MVQ分子发生化学作用,因此界面区域的相互作用进一步增强,吸附橡胶分子层厚度从16.065 nm增加到21.217 nm,硫化后复合材料具有更好的拉伸性能。     

Effect of Silane Coupling Agents on Adhesion of Polybutadiene to Glass

The chosen silane coupling agents consist of a polybutadiene skeleton with  Si(CH₃)₂OCH₃ or  Si(OCH₃)₃ pendent groups hydrolyzable on the glass surface. Their number, and therefore the amount of potential bonds, can be varied. These modified polybutadiene polymers act as primer compatible with the polybutadiene coating to be deposited. The subsequent cross-linking of the double bonds of the silane primed surface with polybutadiene is initiated by benzoyl peroxide, creating chemical bonds between the solid support and its coating. The strength of the adhesion of polybutadiene to glass is measured by the 180° peel test and the values are compared with a non-modified glass surface.     

硅烷偶联剂在玻纤增强复合材料领域中的应用

介绍了玻纤生产中常用硅烷偶联剂的种类、结构、偶联机理及使用方法。着重介绍了硅烷偶联剂在玻纤增强复合材料中的应用,特别是硅烷结构类型、用量对复合材料性能的影响。同时,对硅烷偶联剂的作用及其在玻纤增强热固性和热塑性树脂中的应用进行了阐述。     

Study on the Structure and Mechanical Properties of Dental Barium Glass Particles Surface Modification with Silane Coupling Reagent

The surface-modified dental barium glass with silane coupling reagent KH-570 was studied. The prepared samples before and after modification were characterized by static precipitation, angle of contact, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared ray, and thermo-gravimetric analysis. Research showed that the KH-570 was bound on the surface of barium glass, a firm chemical bonding of KH-570 to barium glass and an organic layer was formed, and the maximum mass fraction of KH-570 coated on the barium glass surface measured was about 2.86%. The surface performance of modified barium glass changed from hydrophilic to hydrophobic. Mechanical tests revealed that the mechanical properties of composite resin filled by KH-570 modified barium glass improved simultaneously.     

不同硅烷偶联剂对电子布性能影响

电子布的化学处理离不开硅烷偶联剂的作用,分析了电子布常用3种硅烷偶联剂的特性,并分析了其对电子布以及半固化片性能的影响。同时呼吁行业内不断改进偶联剂Z-032、Z-132的性能,使其能更好的满足电子布及半固化片的需要。     

硅烷偶联剂对热塑性聚氨酯及复合玻璃性能的影响

利用硅烷偶联剂KH550对热塑性聚氨酯胶膜(TPU)进行表面改性处理,通过红外光谱、表面接触角、可见光透过率、粘结强度等测试研究了偶联剂处理对TPU胶膜的结构和性能的影响.结果表明:改性后的TPU胶膜表面粗糙度增大,表面水接触角降低,由120.5°降至80.5°,胶膜表面活性、耐热稳定性和可见光透过率都有明显的提升.同时,胶膜对于复合玻璃(Glass/TPU/PC)的粘结强度有显著提高,当处理时间为5 min时效果最佳,粘结强度由改性前的2.02 MPa增大至5.63 MPa,提高了179％.     

Mechanical Properties of Phosphate Glass Optical Fibers

In this work, step-index 40/125 μm diameter optical fibers produced from two slightly different lithium phosphate glasses were subjected to mechanical characterization. Tensile tests were carried out on fibers with gage length from 10 to 150 mm, allowing for the determination of the failure stress (ranging from ≈200 to 400 MPa) and the elastic modulus (60 GPa). Some tests were also performed with the fiber “immersed” in water; an important subcritical crack growth effect was pointed out, and a fatigue susceptibility parameter (n) equal to 11.4 was determined. The analysis of fracture mirror allows an estimated fracture toughness equal to 0.5 MPa m^0.5.     

Adhesion Through Silane Coupling Agents

From a study of silane coupling agents in reinforced plastics, a general mechanism of adhesion to hydrophilic mineral surfaces has been devised. According to this theory, adhesion of polymers to dissimilar surfaces is described as a dynamic equilibrium of making and breaking of adhesion bonds between polymer segments and the surface through the agency of a low molecular weight material—usually water. A dynamic equilibrium at the interface allows relaxation of thermal stresses. Water resistance results from a favorable equilibrium toward bonding through polar groups in the polymer. Silanol groups generally give optimum bonding to hydrophilic mineral surfaces.

Such a dynamic mechanism of adhesion not only explains many complex adhesion problems of plastics to mineral surfaces, but also is compatible with the adhesion of ice, barnacles and tooth plaque to surfaces in an aqueous environment and with the requirements for rubber reinforcement by finely divided particulate fillers.     

The Effect of Silane Coupling Agents on the Viscoelastic Properties of Rubber Biocomposites

Summary: This paper deals with the dynamic mechanical study of sisal/oil palm hybrid fiber reinforced natural rubber composites (at frequency 1 Hz) with reference to the role of silane coupling agents. Composites were prepared using sisal and oil palm fibers subjected to chemical modifications with different types of silane coupling agents. The silanes used were Silane F8261 [1,1,2,2‐perfluorooctyl triethoxy silane], Silane A1100 [γ‐aminopropyltriethoxy silane] and Silane A151 [vinyl triethoxy silane]. It was observed that for treated composites, storage modulus and loss modulus increased while the damping property was found to decrease. Maximum E' was exhibited by the composite prepared from fibers treated with silane F8261 and minimum by composites containing fibers treated with silane A151. This was attributed to the reduced moisture absorbing capacity of chemically modified fibers leading to improved wetting. This in turn produced a strong interfacial interface giving rise to a much stiffer composite with higher modulus. Surface characterization of treated and untreated sisal fibers by XPS showed the presence of numerous elements on the surface of the fiber. Scanning electron micrographs of tensile fracture surfaces of treated and untreated composites demonstrated better fiber–matrix bonding for the treated composites.

Scheme of interaction of silanes with cellulosic fibers.     

Adhesion Through Silane Coupling Agents

From a study of silane coupling agents in reinforced plastics, a general mechanism of adhesion to hydrophilic mineral surfaces has been devised. According to this theory, adhesion of polymers to dissimilar surfaces is described as a dynamic equilibrium of making and breaking of adhesion bonds between polymer segments and the surface through the agency of a low molecular weight material—usually water. A dynamic equilibrium at the interface allows relaxation of thermal stresses. Water resistance results from a favorable equilibrium toward bonding through polar groups in the polymer. Silanol groups generally give optimum bonding to hydrophilic mineral surfaces.

Such a dynamic mechanism of adhesion not only explains many complex adhesion problems of plastics to mineral surfaces, but also is compatible with the adhesion of ice, barnacles and tooth plaque to surfaces in an aqueous environment and with the requirements for rubber reinforcement by finely divided particulate fillers.     

硅烷偶联剂对白炭黑胶料性能的影响

研究硅烷偶联剂Si75和NXT对白炭黑胶料性能的影响。结果表明,与偶联剂Si75胶料相比,偶联剂NXT胶料的门尼粘度较低,硫化时间较长,定伸应力和拉伸强度较小,拉断伸长率较大,动态性能差别不大。