纳米SiO2对环氧复合材料壳体纤维强度转化率的影响

以纳米SiO2作为增强材料改性环氧树脂基体，通过NOL环复合材料剪切强度测试，研究不同含量纳米SiO2粒子对复合材料层间剪切强度的影响。结果表明：纳米SiO2含量在6％时，改性效果最好，复合材料层间剪切强度提高约60％；F-12纤维强度转化率提高约9．4％。     

纳米SiO_2改性玄武岩纤维涂层浆料的制备及应用

经KH550改性的纳米SiO2粒子(150 nm),能够稳定分散在玄武岩纤维涂层浆料中,对浆料的粒径及表面张力影响不大。玄武岩纤维表面经改性纳米SiO2改性后,有效地改善了纤维表面粗糙度,使断裂强力提高18.75%,层间剪切强度提高18.76%。纳米SiO2改性的玄武岩连续纤维及其复合材料断面SEM分析表明,玄武岩连续纤维表面均匀涂覆一层纳米SiO2颗粒,使玄武岩连续纤维与环氧树脂的界面相容性大大提高,复合材料断面非常整齐。改性纳米SiO2在玄武岩纤维及环氧树脂之间起桥梁作用。     

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。     

复合材料裙用纳米改性高模量环氧树脂研究

介绍了复合材料裙用纳米改性环氧树脂高模量体系研究.测试了纳米SiO2含量、分散处理方法对浇铸体的影响,确定了优选纳米改性环氧树脂配方.优选配方的拉伸模量、弯曲模量、压缩模量分别高达4.53 GPa、4.62 GPa和4.36 GPa.当环氧树脂用量为40%时,其织物复合材料具有良好的力学性能.SEM可观察到织物复合材料的压缩破坏断口呈纤维屈曲和层间分层的破坏特征.     

微米Al_2O_3层间增韧EP/CF复合材料性能研究

采用喷雾技术,通过VARTM工艺制备了微米Al2O3层间增韧环氧树脂/碳纤维复合材料,研究了微米Al2O3面密度对改性复合材料II型层间断裂韧性的影响,并进一步分析了改性对复合材料弯曲、冲击等性能的影响。研究结果表明,微米Al2O3的加入明显改善了复合材料的II型层间断裂韧性,当面密度为15 g/m2时,改性效果最好,II型层间断裂韧性由348 J/m2增加至522 J/m2,其增韧机理与裂纹的偏移、大量微裂纹的形成、Al2O3粒子从基体中拔出及与基体脱粘等现象有关。此外,改性复合材料的冲击性能得到了较好的改善,弯曲性能则稍有提高。     

SiO2纳米粒子改性填充PC的力学与流变性能

采用SiO2纳米粒子填充改性聚碳酸酯(PC),为使无机纳米粒子在基体PC中分散均匀,经硅烷偶联剂KH-550对SiO2纳米粒子进行表面处理,分析了改性SiO2纳米粒子对复合材料机械与加工性能的影响,并对复合材料进行了分析表征,探讨了无机刚性纳米粒子填充改性典型工程塑料PC的特点并探索其增强增韧的机理,研究了复合物的粘流变性能. 结果表明,改性SiO2纳米粒为球形,在PC基体中分散均匀,湿法改性制备的PC/SiO2纳米粒子复合材料的力学拉伸性能和流变性能最好.     

纳米SiO2改性EP对基体力学性能和芳纶纤维/EP复合材料界面性能的影响

研究了纳米SiO2对环氧树脂(EP)基体力学性能的影响,并进一步采用对位芳纶纤维(F-12)增强环氧树脂,制备了NOL环复合材料,通过复合材料层间剪切性能测试考核了F-12与环氧树脂之间的界面粘接性能.结果表明:环氧树脂中添加适量的纳米SiO2能够有效提高环氧树脂浇注体的拉伸强度、拉伸弹性模量、冲击强度.纳米SiO2的加入,可以有效改善F-12与环氧树脂基体之间的界面粘接性能,降低复合材料的空隙率,F-12/纳米SiO2(6%)-EP复合材料的层间剪切强度(ILSS)提高约60.3%.     

纳米SiO_2改性不饱和聚酯树脂的研究进展

综述了国内纳米SiO2改性不饱和聚酯树脂(UPR)研究的最新进展,重点介绍了纳米SiO2用量、粒子尺寸、表面改性处理等因素对纳米SiO2/UPR复合材料性能的影响及纳米粒子增韧增强的机理,指出了纳米SiO2改性UPR存在的问题和可能的发展方向。     

纳米TiO2对环氧树脂及碳纤维增强复合材料力学性能的影响

利用超声波技术将纳米TiO2在环氧树脂中进行分散,考察了纳米TiO2含量对环氧树脂及碳纤维/环氧复合材料力学性能的影响。研究表明,纳米TiO2可对环氧树脂固化物同时起到增韧增强的作用,冲击断口形貌显示为典型的韧性断裂。同时纳米粒子的加入可改善碳纤维和树脂基体的界面粘结性能,提高复合材料的层间剪切强度。     

聚酰胺6/纳米二氧化硅复合材料的制备和界面研究

采用原位聚合法制备了聚酰胺6/纳米二氧化硅（PA6/nano-SiO2）复合材料,用力学性能测试、 扫描电镜和差示扫描量热法对纳米SiO2粒子和PA6基体之间的界面黏结性进行了表征和研究。结果表明：利用经验公式和力学性能数据计算得知PA6/改性SiO2纳米复合材料的界面参数B值都比PA6/未改性SiO2纳米复合材料的大;SEM观察表明在PA6中加入纳米SiO2,材料的微观结构发生了变化,改性SiO2与PA6基体之间形成了较好的界面结合;分散于PA6基体中的纳米SiO2粒子起到了异相成核作用,改性后的SiO2和PA6基体之间形成柔性界面层有利于PA6基体的结晶。     

热处理对EP/CF及EP/CF/GF复合材料力学性能的影响

采用真空辅助树脂转移模塑(VARTM)技术制备了环氧树脂/碳纤维(EP/CF)和环氧树脂/碳纤维/玻璃纤维毡(EP/CF/GF)复合材料.测试了两种纤维铺层方式中树脂流动距离的平方与流动时间的关系,对两种铺层纤维体系的渗透率进行了研究对比;将两种复合材料进行高温处理,并且对其高温处理前后的力学性能进行分析;利用扫描电子...     

Flexural and Charpy impact behaviour of epoxy/glass fabric treated by nano-SiO2 and silane blend

A sizing formulation, containing compatible and incompatible silane coupling agents with epoxy resin in conjunction with nanoscale colloidal silica, was used to modify the surface of glass fabric. The modified glass fabric/epoxy resin composite panels were fabricated and characterised by flexural test, Charpy impact test and scanning electron microscope (SEM). By combining nano silica with silane blend in the fabric sizing, more energy was consumed under bending and impacting, which resulted in an improvement of the toughness in composites. The flexural strength, bending stain and Charpy impact strength of the epoxy composite/glass fabric treated with 1?wt-% nano silica and silane blend were ～42, ～22 and 35%, respectively, higher than those of silane blend coated glass fabric-reinforced composites (without nano silica). Furthermore, the change of the brittle fracture of the composite into ductile fracture was investigated by SEM micrographs. A possible toughening mechanism was also proposed.     

酚醛树脂/镀银碳纤维导热复合材料的制备与性能

采用化学镀的方法在碳纤维(CF)上镀一层银膜,然后采用搅拌混合的方法制备了酚醛树脂/镀银碳纤维(Ag-CF)导热复合材料,通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线能量色散光谱仪(EDS)等方法对其结构和性能进行表征。结果表明,大量的银粒子均匀分布在CF表面;酚醛树脂/Ag-CF导热复合材料的导热系数、冲击强度和拉伸强度随着Ag-CF含量的增加而逐渐增加;Ag-CF的含量为7.0 %时,酚醛树脂/Ag-CF导热复合材料的综合性能最优,此时其导热系数为1.25 W/(m·K),冲击强度和弯曲强度分别为66.7 kJ/m2和139.2 MPa;残炭率为30 %时,添加量为7.0 %的复合材料对应温度为 500 ℃,高于纯酚醛树脂的 450 ℃。     

有机硅改性环氧树脂及其室温固化的性能研究

采用二苯基硅二醇(DSPD)改性双酚A型环氧树脂(E-51)制备了有机硅改性的环氧树脂,采用硫脲改性聚酰胺650制备了室温快速固化的环氧固化剂。合成产物通过红外进行表征,用盐酸-丙酮法测定改性环氧树脂的环氧值,通过指干时间确定聚酰胺650和改性聚酰胺650与E-51的较优配比。通过差示扫描量热分析法(DSC)和热重分析法(TG)表征改性环氧树脂固化物的耐热性,通过拉伸性能和扫描电镜测试(SEM)表征改性环氧树脂固化物的韧性。实验结果表明,环氧树脂经改性后,其玻璃化温度升高了27℃,与聚酰胺650固化后,固化产物的起始热分解温度明显增加,失重50%的分解温度升高了180℃,固化物的断裂伸长率增加了3.41%,断裂面呈现明显韧性断裂特征。     

Mode‐I intralaminar fracture toughness of silica particles‐filled glass woven fabric‐reinforced vinyl ester composites

Glass woven fabric reinforced vinyl ester (GV) composites filled with different weight proportions of silica particles were fabricated by hand lay up technique followed by oven curing. The plane strain Mode‐I Intralaminar fracture toughness, K_IC of the silica filled GV composites has been studied and the experimental results were compared with those of unfilled GV composites. The findings of the experiments showed that the fracture toughness has improved by the addition of silica particles up to 6 weight % with marginal increase of tensile properties. The silica filled and unfilled GV composites showed brittle fracture, with maximum toughness for 6 weight % silica particles. The morphology of fracture surfaces was examined by using SEM. Pulled and fractured fibers are observed on the fracture surface of GV composites evidencing fiber bridging but not in the silica filled GV composites. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers     

Synthesis of modified silica spheres used for the preparation of dual ultraviolet‐ and thermo‐cured epoxyacrylate/silica composites

To investigate the interfacial effect on properties of epoxyacrylate–silica composites, submicron‐sized silica spheres were synthesized by sol–gel reaction under a basic environment and their surfaces were endowed with vinyl functional groups by further modification with 3‐methacryloxypropyl trimethoxy silane. The pure silica (PS) and the modified silica (MPS) spheres were characterized by Fourier transform infrared, ²⁹Si‐ and ¹³C‐nuclear magnetic resonance (NMR), scanning electron microscope (SEM), and particle size analyzer. The silica spheres were then added to the presynthesized difunctional epoxyacrylate resin with one vinyl group and one epoxide group at each end, in addition to the photo‐ and thermo‐curing agents. After cure, thermal and mechanical properties of the obtained epoxyacrylate–silica composites were measured and compared. Tensile mechanical properties including initial modulus, ultimate tensile strength, and elongation at break, as well as the fracture energy of the epoxyacrylate–silica composite were all increased by increasing the content of silica spheres. Moreover, the composites filled with MPS had stronger interfacial strength between silica sphere and matrix than those with PS and thus exhibited an additional increase of tensile mechanical properties and fracture toughness. The increase of fracture toughness was owing to the crack deflection and particle–matrix debonding as evidenced by SEM pictures on the fracture surface. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers     

用于彩色滤光片的共聚型红色硅树脂的制备与性能研究

从提高质量、降低成本的彩色滤光片技术着手,面向喷墨打印制造工艺,对其适用的着色硅树脂进行了分子设计.合成了红色硅氧烷染料（AnN-SiEO）,进行了化学结构表征,并与甲基三乙氧基硅烷（MTES）通过溶胶-凝胶法制备了适合于喷墨工艺的共聚硅树脂膜（AnN-PMS）.采用紫外可见光谱分析仪对共聚硅树脂膜（AnN-PMS）和掺杂硅树脂膜（AnN@PMS）分别进行了测量,发现有5 nm左右的蓝移,归结于介质体系极性的影响.在光稳定性测定中,发现染料与聚合物的化学键合有益于染料光牢度（耐漂白能力）的提高.在耐溶剂性能方面,共聚硅树脂膜（AnN-PMS）明显优于掺杂硅树脂膜（AnN@PMS）     

纳米粒子增韧环氧树脂的研究

本文主要探讨了纳米SiO2对环氧树脂韧性的影响。通过用偶联剂对纳米粒子表面改性处理，再辅助以超声波振动，使纳米粒子在环氧树脂中分散均匀、稳定，增强了纳米粒子与环氧树脂之间的粘结力，从而使复合材料的冲击强度得到了较大的提高，增韧效果较为明显。     

环氧树脂/改性纳米Y2O3复合材料的固化动力学

利用缩聚反应,通过"一步法"在经过偶联剂处理的纳米氧化钇(Y2O3)粒子表面接枝超支化聚酯,得到超支化聚酯接枝改性纳米氧化钇(Y2O3-g-HBPE)。研究了Y2O3-g-HBPE对环氧树脂非等温固化行为的影响,利用Kissinger和Crane方程研究了固化动力学参数。结果表明,Y2O3-g-HBPE降低了环氧树脂固化反应的活化能,但没有改变环氧树脂的固化机理。     

Improvement in the bonding strength of laminated composites by using air‐textured core‐and‐effect glass yarns

Delamination is the most common failure mode in laminated composites due to the reduced strength in the through‐the‐thickness direction. Air‐jet texturing was used to produce bulk and loops in the yarn, which provides more surface contact between the fibers and the resin. The development of core‐and‐effect textured glass yarns and the effect of texturing parameters were presented in the previous article. This article describes the effect of texturing on the mechanical properties including tensile properties, flexure properties, interlaminar shear strength (ILSS) and fracture toughness (Mode I) of glass laminated composites. The composites of plain and twill weave fabrics were developed from both the textured and nontextured yarns. It was observed that the tensile properties decreased and the flexure properties remained unchanged after texturing. However, significant improvement was observed in ILSS and the Mode I fracture toughness of the composites after texturing. The bulkier, loopy structure of the textured yarn provided more surface contact between the fiber and the resin and significantly improved the bonding strength. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers