Nanoindentation Study on Mechanical Properties of Nano-SiO2/Dental Resin Composites

The micro/nano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)/triethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the filling content of nano-SiO2 particles on the mechanical properties of the dental composites was studied as well. The experimental results showed that the incorporation of the nano-SiO2 particles at low concentrations (up to 10 wt.%) can apparently increase the hardness and elastic modulus of the dental rein composites. The plasticity index indicates a best elastic recovery capability at a proper amount (4 wt.%) of the nanoparticles. Combined with the infrared spectrum, the mechanical enhancement mechanisms of the dental resin composites were analyzed.

Epoxy Resin/Nano Ni@C Composites Exhibiting NTC Effect with Tunable Resistivity

Epoxy resin/Ni@C nanoparticle composites with aligned microstructure were prepared by using a procedure of magnetic field assisted curing. The results show that the resistivity of composites exhibits negative temperature coefficient （NTC） effect above room temperature, and can be adjusted by varying the content filler and the magnitude of magnetic field applied. Hill＇s quantum tunneling model was modified to understand the electrical conduction mechanism in the composites. It shows that the NTC effect ascribes to the dominant thermal activated tunneling transport of electron across adjacent nanoparticles, as well as the low thermal expansivity of epoxy resin matrix.

Effect of E-44 Epoxy Resin and Pyrolysis Temperature on the Adhesion Strength of SiBCN Ceramic

An adhesive of the SiBCN ceramic was synthesized through the polymer derived ceramics(PDC)route.Meanwhile with higher adhesion strength and simpler process condition,the polyborosilazane(PSNB)was modified by E-44 epoxy resin.The E-44 epoxy resin was used to promote the oxidation process of SiBCN,in other words,to produce more amount of SiO2-B2O3 glasses.The phase composition,elemental analysis,chemical bonds and microstructure were investigated by using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and scanning electron microscope(SEM)measurements.The E-44 modified adhesives were cured at 120℃in air for 2 h,and were pyrolyzed at 1200,1400,and 1500℃for 2 h in air,respectively.The highest adhesion strength of the modified adhesive was up to 5.33,12.23,and 12.50 MPa after being heat treated at 1200,1400,and 1500℃,respectively.Finally,we proposed an adhesion model and revealed the adhesion mechanism of SiBCN ceramic.

Impact of SF_(6) Decomposition Products on Epoxy Resin Chemical Stability and Doping-nano-Al_(2)O_(3)-based Enhancement Using the ReaxFF-MD Method

Chemically active by-products formed by corona discharge in SF_(6) gas are prone to damaging the exposed epoxy resin,or even leading to an entire insulation failure of the operational GIS/GIL power equipment.In this proposed research,reactive force field molecular dynamic simulation methodology is applied to investigate the chemical reaction kinetics of epoxy polymer under the impact of highly energetic particles(F,S,SOF,SF,OH and O)so as to explain the degradation mechanism.Among all cases,SF particle-impacted epoxy resin suffers the most serious surface erosion with the lowest remnant mass of 9%and deepest damage penetration of 32.6Å,to which the S particle-caused damage showed similar results.Due to high reactivity of the S atom,it can merge into the epoxy molecules to promote long chain breaking,causing a six-membered ring opening and further dissociation of short carbon chains,which makes the epoxy resin molecules undergo faster spontaneous dissociation with increased temperatures.The changes of small molecular gas products,such as CO_(2),H_(2)O and CH_(2)O,as well as that of the characteristic products,such as HF,CS_(2),SO and H_(2)S,are also evaluated under the impact of different particles.The presented research indicates that enhancing the resistance strength of epoxy polymer against S and SF particles'corrosion is the key approach to improving chemical stability in the SF_(6) environment.Further studies were implemented to optimize the concentration and diameter of nano-Al_(2)O_(3) doped in the composites.According to this paper,aluminum nanoparticle with a diameter of 1nm could significantly reduce the erosion caused by SF and S particles.The micro-scale mechanism lies primarily within two aspects:the nanoparticles improve the surface heat transfer efficiency as to reduce temperature rise,and also provide an effective protection area by balancing distribution and self-exposing,which finally slows down the pyrolysis process of epoxy resin,as well as the reaction intensity with the incident particles.

纳米SiO_(2)/桐油基环氧树脂复合材料的制备及性能

通过制备环氧化桐油酸甲酯,并将其与E51环氧树脂共混,得到桐油基环氧树脂。再用硅烷偶联剂KH-570改性纳米SiO_(2),并以不同的质量比添加到桐油基环氧树脂中,探究不同纳米SiO_(2)含量在力学性能、接触角以及耐磨损性能上对桐油基环氧树脂复合材料的影响。结果表明:质量比为6%的纳米SiO_(2)的桐油基环氧树脂复合材料的拉伸和冲击强度都得到了提高,冲击强度较未加入纳米SiO_(2)提高了53.3%,水接触角也从93.3°提高到104.76°,并且添加纳米SiO_(2)之后复合材料的耐磨损性能也随之增强。

Study on preparation and properties of CeO_2/epoxy resin composite coating on sintered NdFeB magnet

The CeO2/epoxy resin composite coating was deposited on NdFeB substrate by cathode electrophoresis method for enhancing the anticorrosion and anti-wear performances. The morphologies and structures were characterized by a scanning electron microscope and an X-ray diffractometer. The micro hardness of the composite coating was evaluated by a microhardness tester. The corrosive behaviors of the coatings were studied by potentiodynamic polarization curve, electrochemical impedance spectroscopy and neutral salt spray tests. The concentration of CeO2 nanoparticles（NPs） in the electrophoresis bath was optimized according to the coating structures and anticorrosion performances. The results show that CeO2 NPs can enhance the microhardness of the composite coatings. Moreover, the nanoparticles disperse uniformly in the matrix when the concentration is lower than 30 g/L. The microhardness of CeO2/epoxy resin（30 g/L） composite coating is about 63% higher than that of the blank epoxy resin coating. And the NSS time of the CeO2/epoxy resin（30 g/L） composite coated sample can reach 1248 h.Meanwhile, the composite coatings possess no deteriorate influence on the magnetic properties of NdFeB substrates. The anticorrosion mechanisms of the composite coatings on the NdFeB substrate are deeply discussed.

YbF_3/SiO_2 Fillers as Radiopacifiers in a Dental Adhesive Resin

The objective of this study was to evaluate the effect of functionalizing a dental adhesive resin with YbF_3/SiO_2 fillers for use as radiopacifiers.Particles of YbF_3/SiO_2 were obtained with the high-energy mechanical milling method and characterized by both physical and chemical methods.After characterization,the particles were sieved and silanized prior to being incorporated into an adhesive resin.The stability of the particle suspension was then evaluated.After light activation,the radiopacity,degree of conversion,flexural strength and elastic modulus were determined.The dental adhesive resins with 10 and 15 wt% of filler provided satisfactory radiopacity,while flexural strength and elastic modulus were not affected.The degree of conversion was statistically lower than that of the control(p<0.05).The method used for incorporating the tested ytterbium fluoride/silicon dioxide particles at concentrations of 10 and 15 wt% was shown to be feasible for the development of a radiopaque dental adhesive system.

革用聚氨酯/SiO_2纳米复合材料的制备与物性研究

采用溶胶 凝胶反应制备纳米SiO2 颗粒 ,然后通过超声分散机将SiO2 纳米颗粒分散到聚氨酯树脂中制备出聚氨酯 SiO2 纳米复合材料。利用透射电子显微镜 (TEM)、傅里叶红外分光光度计 (FTIR)、万能电子试验机、动态力学分析仪 (DMA)、量热示差扫描仪 (DSC)分别表征了纳米复合树脂材料的结构和形态、力学性能和热稳定性。实验结果表明 ,纳米SiO2 颗粒均匀分布在聚氨酯中 ,并与聚氨酯的基团发生了反应 ;聚氨酯 SiO2 纳米复合材料具有较纯聚氨酯树脂更高的模量和内耗峰强度。拉伸强度和拉伸模量得到了很大的提高 ,并具有一个最佳值 ;而断裂伸长率有所下降 ,但随SiO2 含量的进一步增加又有所提高 ;纳米SiO2 掺杂对聚氨酯树脂的耐低温的性能影响不大 ,却提高了树脂的耐热性能 ,从而使聚氨酯树脂使用温度更宽。

纳米SiO_2/环氧树脂复合材料的制备和性能

通过超声波分散和偶联剂处理的方法使纳米 Ｓｉ Ｏ２ 粒子在环氧树脂中充分分散，制得了纳米 Ｓｉ Ｏ２／ 环氧树脂复合材料．利用拉伸测试 、冲击测试、热失重分析等方法对该复合材料的性能进行了研究，结果表明，纳米 Ｓｉ Ｏ２ 粒子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．

纳米SiO_2颗粒对PU树脂热稳定性能的影响

采用溶胶 -凝胶法制备纳米SiO2 颗粒 ,并以此制备了SiO2 /PU复合材料 ,用扫描电子显微镜、红外光谱仪、量热示差扫描仪和热重法分别表征了纳米复合树脂材料的结构和形态及热稳定性。结果表明 ,纳米SiO2 能够均匀地以纳米尺寸分散于PU树脂中 ,并与PU中的基团发生了化学反应 ,形成了键合。SiO2 对PU树脂的耐低温性能影响不大 ,却提高了树脂的热稳定性能 ,使树脂的使用温度范围变宽。

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。

纳米SiO_2/邻甲酚醛环氧树脂复合材料的性能与固化特性

制备了纳米SiO2 /邻甲酚醛环氧树脂 (o CFER)复合材料 ,通过力学性能、热性能、扫描电镜以及DSC等方法对该复合材料的性能进行了研究 ,确定了工艺参数。结果表明 ,纳米SiO2 的加入较大地提高了o CFER的拉伸强度、冲击强度、热稳定性等性能 ;通过动态DSC测定确定了纳米SiO2 /o CFER复合材料的固化反应放热量 -ΔH =12 8J/g ,活化能为 48 9kJ/mol,反应级数n =0 871,频率因子A =3 4× 10 3 s-1;固化工艺参数为 :T凝胶 =71℃ ,T固化 =13 3℃ ,T后处理 =165℃。

纳米复合涂饰剂的组分——纳米SiO_2溶胶的制备

以碱为催化剂采用溶胶-凝胶法制备纳米SiO2 溶胶,对制备过程中影响溶胶性能的各种因素进行了探讨;用红外光谱、透射电镜对纳米SiO2 溶胶进行检测,并在纳米SiO2 溶胶与丙烯酸树脂复合后,对丙烯酸树脂和纳米复合涂饰剂膜进行了DSC、耐水性和耐溶剂性测定。结果表明:制备溶胶的较优条件为混合试剂的滴加速度为2 0滴/min ,高速机械作用下,加入长碳链阳离子表面活性剂。与丙烯酸树脂膜比较,复合涂饰剂膜的耐水性提高了5 5 94% ,耐溶剂性提高了5 5 41 %。

纳米SiO_2/聚丙烯酸酯复合乳液的研究

试验了四种制备纳米SiO2 /聚丙烯酸酯复合乳液的方法 ,结果表明 ,以KPS +NH3·H2 O引发乳液聚合和以偶联剂处理SiO2 纳米溶胶再进行乳液聚合两种方法都可以得到稳定存在的无机纳米SiO2 /有机物复合乳液 ,其性能优于全丙乳液。而用HPC或以阳离子表面活性剂 -十六烷基三甲基溴化铵 (CTAB)处理SiO2 纳米溶胶后再进行乳液聚合两种方法 ,必须要有合适孔径的超滤膜或合适的专用阳离子单体 ,才能制得稳定的复合型的高分子乳液。

α-Si_3N_4与SP_1SiO_2熔附条件和填料比例对复合树脂性能的影响

目的:检测α-氮化硅(α-Si_3N_4)与多微孔纳米二氧化硅(SP_1SiO_2)的最佳熔附温度、熔附时间和最佳填料比例,阐明其对复合树脂性能的影响。方法:将α-Si_3N_4晶须和SP_1SiO_2颗粒按质量比5∶1混合,以250℃·h-1的升温速度分别升至500℃、650℃、800℃、950℃和1 100℃,并分别保持10min、30min和3h,即为α-Si_3N_4-SP_1SiO_2熔附体复合树脂组,同时设立SP_1SiO_2颗粒组、α-Si_3N_4晶须组和α-Si_3N_4与SP_1SiO_2混合未熔附组(混合组),选择2种市售复合树脂作为对照组。环己烷溶液处理后与树脂基质按质量分数60%充分混合、聚合制作试样,测试挠曲强度并分析其断面扫描电子显微镜(SEM)形貌。再将配比为2∶1的α-Si_3N_4与SP_1SiO_2混合,最佳熔附条件熔附,环己烷溶液处理后与树脂基质按20%、40%、60%、70%和75%质量分数充分混合、聚合,选择2种市售复合树脂作为对照组,测试挠曲强度并分析其断面SEM形貌。结果:α-Si_3N_4-SP_1SiO_2熔附体复合树脂组800℃、30min时挠曲强度值最大,挠曲强度值均明显高于SP_1SiO_2颗粒组、α-Si_3N_4晶须组、混合组和2个对照组(P<0.05),断面SEM形貌与力学性能相符。α-Si_3N_4-SP_1SiO_2熔附体复合树脂挠曲强度随着α-Si_3N_4与SP_1SiO_2熔附体填料比例从20%增加至60%逐渐增大(P<0.05),填料比例为60%~70%时挠曲强度值增加不明显,填料比例为70%~75%时挠曲强度值减小,填料比例为60%和70%时复合树脂的挠曲强度值均明显高于填料比例为20%、40%和75%时复合树脂及对照组,断面SEM形貌与力学性能相符。结论:α-Si_3N_4与SP_1SiO_2最佳熔附条件是800℃处理30min;α-Si_3N_4与SP_1SiO_2熔附体填料最佳比例为70%。

纳米SiO_(2)/玄武岩纤维增强环氧树脂复合材料的制备和耐久性能研究

首先,利用上浆法,将改性纳米SiO_(2)与玄武岩纤维复合;然后利用手工铺料法,制备了纳米SiO_(2)/玄武岩纤维增强环氧树脂层状复合材料(S-BF/EP)。利用SEM对改性玄武岩纤维和玄武岩纤维/环氧树脂层状复合材料的表面形貌和界面形貌进行了研究;利用FT-IR、TGA和万能力学试验机对复合材料的分子结构、热解性能和耐久性能进行了研究。结果表明,纳米SiO_(2)成功被偶联剂改性,并均匀附着在玄武岩纤维表面,玄武岩纤维表面的粗糙度被有效地改善;S-BF/EP层状复合材料内纳米SiO_(2)对应的Si-O-Si键收缩振动,使得S-BF/EP层状复合材料比空白EP样品多出1107和803 cm-1两个振动峰;S-BF/EP层状复合材料降解温度比EP材料高10℃,其在建筑材料应用方面更有优势;S-BF/EP层状复合材料的抗拉强度和抗弯强度分别为489和987 MPa,均高于环氧树脂材料样品的368和795 MPa;经过95℃湿热老化后,S-BF/EP层状复合材料抗拉强度和抗弯强度性能损失分别为23.9%和9.6%,明显低于空白EP样品的32.9%和36.6%;断裂面SEM分析表明,S-BF/EP层状复合材料中纤维与环氧树脂基体结合紧密,未发现裂纹或者缝隙。

SiO_(2)无溶剂纳米流体粒径和含量对环氧树脂力学和热性能的影响

为了改善纳米二氧化硅(SiO_(2))在树脂基体中的分散性,同时研究SiO_(2)粒径对树脂基体性能的影响,采用Stober法制备了50,90 nm和220 nm三种不同粒径的纳米SiO_(2),并通过表面接枝硅烷偶联剂及聚醚胺的方法制备了相应的SiO_(2)无溶剂纳米流体(NF)。利用红外光谱(FT-IR)、透射电镜(TEM)、热失重(TGA)和差示扫描量热法(DSC)等测试方法对流体的化学结构和物理形貌等理化性质进行了表征。测试了不同粒径和不同含量SiO_(2)纳米流体/环氧树脂(NF/EP)复合材料的力学性能,结果表明,复合材料的力学性能随着流体含量的增加呈现先升后降的趋势;50 nm SiO_(2)流体对环氧树脂冲击性能改善明显,当添加量为1 phr时,弯曲强度增加了11.64%,冲击强度增加了54.55%;而220 nm SiO_(2)流体对弯曲性能改善更为明显,当添加量为1 phr时,弯曲强度提高17.51%,冲击强度提高50.00%。玻璃化转变温度和线膨胀系数测试的结果表明,NF/EP有更高的玻璃化转变温度和更低的线膨胀系数。NF/EP因具有良好的力学性能和低的线膨胀系数,可用作电子灌封树脂。

纳米SiO_(2)的表面改性及SiO_(2)/WEPN复合材料的制备与性能研究

以γ-氨丙基三乙氧基硅烷(APTES)对纳米SiO_(2)进行表面改性,以酚醛预聚体、环氧氯丙烷(ECH)、二乙醇胺(DEA)等为主要原料并通过预聚体法合成SiO_(2)/水性酚醛环氧树脂(WEPN),与三乙烯四胺(TETA)固化得到复合涂膜。通过FT-IR、SEM、TEM、TGA、力学性能测试等对产物的结构与性能进行表征。结果表明,APTES对纳米SiO_(2)改性成功,改性后亲油效果增加,团聚明显改善,APTES的最佳质量分数为40%;纳米SiO_(2)通过化学键接入WEPN中,分散良好,SiO_(2)的加入有效提高了WEPN的热稳定性、韧性及耐酸碱性等应用性能。当纳米SiO_(2)质量分数为2%时,涂膜的综合性能最好,拉伸强度由67.15 MPa增至77.48 MPa,耐冲击性达到50 cm,断裂伸长率由3.55%增至4.32%,水接触角增至115°,涂膜(10%失重)分解温度从298.5℃提高到350.1℃,残留量由19%增至29%。

纳米SiO_2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 6 0 % ;F - 12纤维强度转化率提高约 9.4 %。

纳米二氧化钛/玻璃鳞片协同增强环氧树脂的耐磨性研究

[目的]环氧树脂(EP)复合材料虽有良好的力学性能和化学稳定性,但脆性大、摩擦因数高、耐磨性差,使其难以满足运动摩擦部件的性能要求。[方法]通过向EP基体中添加改性纳米TiO_(2)和玻璃鳞片(GF)制备了TiO_(2)/GF/EP复合材料,研究了纳米TiO_(2)添加量对复合涂层性能的影响。采用扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FT-IR)对涂层的断面形貌和分子结构进行了表征。[结果]利用KH-550硅烷偶联剂对纳米TiO_(2)进行改性处理消耗了其表面大量的羟基,有效减少了纳米TiO_(2)的团聚。GF和改性纳米TiO_(2)与EP基体的界面相容性良好,TiO_(2)/GF/EP复合涂层的致密性与纯EP涂层相比明显提高。对于添加了相对于EP质量4%的纳米TiO_(2)和30%的GF的复合涂层,其显微硬度比纯EP提高了46.8%,摩擦因数和磨损后的质量损失分别比纯EP减小了46.1%和52.0%。[结论]改性纳米TiO_(2)和GF共同作为填料加入,可使EP的显微硬度和耐磨性得到明显提高,摩擦因数明显减小,综合性能得到提升。