纳米TiO2对环氧树脂胶粘剂性能影响的研究

制备了纳米TiO2／环氧树脂胶，研究了不同制备方法和纳米TiO2含量对环氧树脂胶力学、热力学性能的影响，并采用扫描电镜时纳米TiO2粒子的增韧机理进行了分析，初步探讨了纳米TiO2／环氧树脂胶微波固化。研究结果表明：超声波与均质高速分散机结合使用，可使纳米TiO2粒子均匀分散于环氧树脂中。当纳米粒子TiO2质量分数为3％时，性能最佳。     

SiO2/聚氨酯纳米复合物的在位合成及其在环氧树脂中分散行为的研究

以水性阳离子聚氨酯纳米粒子为纳米微囊,利用原位水解法使正硅酸乙酯(TEOS)在囊内水解、聚合生成二氧化硅(SiO2)纳米粒子,从而合成出SiO2/聚氨酯纳米复合物的稳定水基乳液,实现纳米复合物中SiO2纳米粒子的均匀分散和良好的界面结合。并以此作为已表面改性的纳米粒子实现SiO2纳米粒子在环氧树脂的均匀分散。通过能谱扫描、透射电镜和乳液粒子粒径与分布等测试方式对含有环氧树脂的水性SiO2/聚氨酯纳米复合物进行测试。结果表明,SiO2/聚氨酯纳米复合物可以在环氧树脂中均匀分散且不团聚,同时也可促进环氧树脂在水中的分散。     

纳米粒子/环氧树脂复合材料的固化动力学研究

在纳米Al2O3、Si3N4、SiC填充环氧树脂复合材料体系中,纳米粒子表面活性及粒子与环氧树脂之间的相互作用影响着环氧树脂的固化过程.本文利用傅立叶红外光谱表征了纳米粒子与环氧树脂之间的化学作用情况,并利用差视扫描量热仪研究了不同纳米粒子/环氧树脂复合材料的固化动力学.结果表明,具有相对最强表面活性的纳米Al2O3粒子与基体之间的相互作用最强,同时该粒子对环氧树脂固化过程的促进作用最显著.     

纳米技术在弹性体增韧环氧树脂中的应用

综述了弹性体与无机纳米粒子协同增韧改性环氧树脂以及纳米弹性体粒子增韧环氧树脂的应用进展,并且对纳米技术在弹性体增韧环氧树脂中的应用进行了展望。     

纳米SiO_(2-x)改性环氧复合材料研究

采用偶联剂表面处理同时通过超声波震荡的方法使纳米SiO2 x粒子在环氧树脂中充分分散,制得了纳米SiO2 x环氧E-51/MeTHPA复合材料。利用INSTRON试验机、TEM、TG等方法对该复合材料的性能进行了研究,结果表明,纳米SiO2 x粒子能够以纳米级分散到环氧树脂基体中,较大地提高了环氧树脂的拉伸强度、冲击强度、断裂伸长率、热稳定性等性能。     

粒子分散性对环氧树脂/纳米SiO2材料性能的影响

通过原位分散聚合法制得了环氧树脂／纳米SiO2复合材料。采用超声波和偶联剂改善了纳米SiO2在基体中的分散性，利用拉伸实验、冲击实验、扫描电子显微镜、热重法等方法研究了粒子分散性对复合材料结构和性能的影响。结果表明：超声波和偶联剂都能使纳米SiO2均匀地分散在环氧树脂基体中，有效地增加复合材料的力学强度及韧性，并能提高材料的耐热性。对于提高纳米SiO2在环氧树脂中的分散均匀性，超声波的作用优于偶联剂。     

环氧树脂增韧改性新技术

概述近年来国内外对环氧树脂增韧改性的研究情况，着重介绍了利用互穿网络聚合物(IPN)、热致液晶聚合物(TLCP)及纳米粒子等增韧改性环氧树脂的最新方法和研究进展，并对IPN、TLCP及纳米粒子的增韧方法、增韧机理作了介绍和讨论。     

纳米粒子改性环氧树脂的研究进展

环氧树脂是一类具有优异性能的热固性材料,广泛应用于航空航天、车辆工程等领域,但由于其交联结构,环氧树脂韧性较差。其中纳米粒子改性环氧树脂在增韧环氧树脂的同时,其力学性能也有所提升。对三种纳米粒子改性环氧树脂的研究进展进行了综述,包括纳米二氧化硅、石墨烯及衍生物和碳纳米管,对改性效果进行了详细的阐述分析,讨论了增韧机理。     

硅烷偶联剂对纳米Al2O3改性的研究

本工作以改善纳米粒子在环氧树脂基体中的分散性,提高无机粒子与基体的界面结合力为目的,选择了硅烷偶联剂KH550和KH570分别对纳米Al2O3粒予表面进行改性。文章系统研究了各种聚合条件（加料顺序、偶联剂加入量、反应时间）对改性效果的影响。TGA测试表明获得了不同接枝率的改性粒子。改性粒子与环氧树脂反应后进行的TGA测试以及FTIR测试证明了KH550改性的纳米粒子能够与环氧树脂发生反应,而KH570改性的纳米粒子不能发生反应。     

纳米SiO_2环氧树脂复合材料性能研究

以纳米SiO2 作为增强材料 ,制备纳米复合材料 ,研究了表面处理及不同的纳米含量对纳米复合材料性能的影响 ,采用透射电镜对纳米SiO2 粒子的分布进行了表征。结果表明 ,SiO2 处理与否 ,纳米SiO2 均可以在环氧树脂中分散 ,SiO2 表面处理后 ,纳米SiO2 复合材料性能得到提高。纳米SiO2 可以使环氧树脂增刚、增强、增韧     

改性环氧树脂制备复合材料层间断裂韧性的实验研究

采用纳米SiO2对环氧树脂改性并通过RTM工艺制成碳/环氧复合材料,观察纳米粒子在复合材料中的分布情况,测试复合材料的层间断裂韧性并用显微镜观察断裂面形貌.结果表明,纳米粒子在复合材料厚度方向和沿预裂纹的面内方向均没有明显的过滤性,改性后的碳/环氧复合材料的层间断裂韧性比改性前提高45％,断裂面更粗糙,纳米SiO2对环氧树脂的增韧效果良好.     

SiAlON nanoparticles effect on the behaviour of epoxy coating

In this work, the influence of SiAlON nanoparticles loading level (0?C12?wt%) was investigated on the mechanical and chemical properties of epoxy resin-based nanocomposites coatings. The samples were characterized by fracture toughness, chemical, pull off, hardness and abrasion tests, followed by scanning electron microscopy of the fracture surfaces and sample surface after performing a chemical test. Nanoparticles were also characterized by transmission electron microscopy and linear light scattering analysis techniques. Epoxy resin coating based on bisphenol A was treated with polyamine hardener as a curing agent. Fracture toughness measurements were carried out using a single edge notched bend specimens within a three-point bending test at room temperature. Effect of SiAlON nanoparticles on the chemical resistance of epoxy resin was investigated by immersion of samples in 3.5?wt% NaCl solution at 85?°C for 60?days. Results indicated the enhancements in the mechanical properties and chemical resistance of epoxy nanocomposite due to the addition of small parts of SiAlON nanoparticles. The contents of samples with 3 and 5?wt% of SiAlON nanopowders have been considered as optimum contents compared to the other samples. They showed improvement in the crack propagation resistance in chemical solution and fracture toughness tests, both. Enhancment in abrasion resistance was found at either of 3 and 5?wt% SiAlON epoxy nanocomposite samples where they showed 59 and 34% abrasion resistance more than that of the neat resin, respectively.     

Toughening effects of titanium dioxide nanoparticles on TiO2/epoxy resin nanocomposites

The purpose of this study was to investigate the influence of adding different volume concentrations of titanium dioxide (TiO₂) nanoparticles to an Araldite LY 564 epoxy resin. In order to characterize the nanoparticles toughening effects, compact tension specimens were used to determine the plane strain fracture toughness (K_IC). Additionally, elastic modulus, tensile strength, and maximum sustained strain were measured in mechanical tensile tests. Composites were analyzed by means of electronic microscopy, both TEM and SEM, to check the dispersion quality of the nanoparticles in thepolymer matrix and to study the observed toughening mechanisms of the fillers. Addition of TiO₂ nanoparticles could simultaneously improve the stiffness and the toughness of the epoxy resin. POLYM. COMPOS., 31:1241–1246, 2010. © 2009 Society of Plastics Engineers     

Synergistic Toughening in Ternary Silica/Hollow Glass Spheres/Epoxy Nanocomposites

Herein, the fracture toughness of ternary epoxy systems containing nanosilica and hollow glass microspheres (HGMS) is investigated. The experimental measurements reveal synergistic fracture toughness in some hybrid compositions: The incorporation of 10 phr of HGMS and nanosilica alone modify the fracture toughness of epoxy by 39% and 91%, respectively. However, use of 10 phr hybrid modifier can enhance the fracture toughness of the resin up to 120%. Observations reveal different toughening mechanisms for the blends i.e., plastic deformation for silica nanoparticles and crack bifurcation for HGMS. Both of these toughening mechanisms additively contribute to the synergism in ternary epoxies.     

Fracture behaviours of in situ silica nanoparticle-filled epoxy at different temperatures

Fracture behaviours of nanosilica filled bisphenol-F epoxy resin were systematically investigated at ambient and higher temperatures (23 °C and 80 °C). Formed by a special sol-gel technique, the silica nanoparticles dispersed almost homogenously in the epoxy resin up to 15 vol.%. Stiffness, strength and toughness of epoxy are improved simultaneously. Moreover, enhancement on fracture toughness was much remarkable than that of stiffness. The fracture surfaces taken from different test conditions were observed for exploring the fracture mechanisms. A strong particle-matrix adhesion was found by fractography analysis. The radius of the local plastic deformation zone calculated by Irwin model was relative to the increment in fracture energy at both test temperatures. This result suggested that the local plastic deformation likely played a key role in toughening of epoxy.     

电子模块灌封用柔性阻燃型改性环氧树脂研究

选用柔性环氧树脂、活性增韧剂、磷系列阻燃剂FR-P和复合阻燃剂FR-A对环氧树脂CYD128进行改性,提高环氧树脂的柔韧和阻燃等性能,取得良好的改性效果,成功制备出柔性阻燃环氧电子灌封材料, 有利于解决环氧树脂在电子工程应用过程中的问题。     

自修复聚合物材料用微胶囊

Microcapsules with dicyclopentadiene (DCPD) as core material and urea formaldehyde resin as wall material used for making self-healing polymer material were prepared with the in-situ polymerization method. The effect of microcapsules on the fracture toughness of epoxy resin was studied. The addition of microcapsules into epoxy resin results in the decrease of fracture toughness. When microcapsule content was kept constant, as the microcapsule size increased the fracture toughness of the epoxy resin decreased linearly and the percentage of decrease compared to the neat epoxy without microcapsules increased linearly. Moreover, the fracture toughness of the material decreases linearly with the increase of microcapsule content.     

胺化酰亚胺固化的环氧树脂体系的特性及其固化机理

能热分解成异氰酸酯和叔胺的胺化酰亚胺是很好的潜伏性环氧树脂固化剂和环氧-酸酐体系的固化促进剂,它固化的环氧树脂有许多优异的性能,特别是高的韧性和粘接强度。由胺化酰亚胺热分解速度控制的、高温下相对慢的、独待的固化机理是韧性的起因。     

端脂肪氨基聚醚改性环氧树脂的性能研究

用自制的一种既含聚醚柔性链段又含苯脂肪氨基刚性链段的端脂肪氨基聚醚(APPEG)作为固化剂对环氧树脂进行增韧改性。扫描电子显微镜和力学性能测试结果表明,固化剂对环氧树脂具有明显的增强、增韧效果,且改性的环氧树脂胶粘剂具有很好的填充性能,填充比高达50%。与羰基铁粉组成的涂层材料具有优异的力学性能和热稳定性能。     

The effect of silica nanoparticles and carbon nanotubes on the toughness of a thermosetting epoxy polymer

Silica nanoparticles and multiwalled carbon nanotubes (MWCNTs) have been incorporated into an anhydride‐cured epoxy resin to form “hybrid” nanocomposites. A good dispersion of the silica nanoparticles was found to occur, even at relatively high concentrations of the nanoparticles. However, in contrast, the MWCNTs were not so well dispersed but relatively agglomerated. The glass transition temperature of the epoxy polymer was 145°C and was not significantly affected by the addition of the silica nanoparticles or the MWCNTs. The Young's modulus was increased by the addition of the silica nanoparticles, but the addition of up to 0.18 wt % MWCNTs had no further significant effect. The addition of both MWCNTs and silica nanoparticles led to a significant improvement in the fracture toughness of these polymeric nanocomposites. For example, the fracture toughness was increased from 0.69 MPam^1/2 for the unmodified epoxy polymer to 1.03 MPam^1/2 for the hybrid nanocomposite containing both 0.18 wt % MWCNTs and 6.0 wt % silica nanoparticles; the fracture energy was also increased from 133 to 204 J/m². The mechanisms responsible for the enhancements in the measured toughness were identified by observing the fracture surfaces using field‐emission gun scanning electron microscopy. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011