有机蒙脱土的结构表征及增韧环氧树脂研究

以十六烷基三甲基溴化铵插层制备了有机蒙脱士,通过FTIR、XRD、TGDSC表征了其有机改性效果．将上述有机土以不同含量添加到环氧树脂中,考察了复合材料的力学性能．研究发现,添加5％有机蒙脱土可以使环氧树脂的冲击强度提高155．3％,断裂强度提高45．5％．利用SEM和AFM,对有机蒙脱土增韧环氧树脂复合材料断口进行了微观研究．     

四官能基环氧树脂／蒙脱土纳米复合材料的制备及表征

采用阳离子交换的方法对蒙脱土进行了有机化改性,并制备了环氧树脂／蒙脱土纳米复合材料．用FT-IR和XRD研究了环氧树脂／蒙脱土纳米复合材料的结构,并测试了纳米复合材料的性能．实验结果表明,改性使蒙脱土层间距变大,纳米复合材料的力学性能与纯环氧树脂相比提高了50％．     

固化剂对环氧树脂/蒙脱土纳米复合材料中蒙脱土剥离行为的影响

采用阳离子交换的方法对蒙脱土进行了有机改性，使蒙脱土由亲水性变成亲油性，并使其层间距由原来的1．2nm扩大到2．2nm。分别使用甲基四氢苯酐和4，4’-二胺基二苯基甲烷为固化剂，制备两种环氧树脂／蒙脱土纳米复合材料，并用x一射线衍射仪和透射电镜(TEM)分析有机蒙脱土在环氧树脂中的剥离行为。研究表明，固化剂的选择对有机蒙脱土的剥离行为有很大的影响，用固化剂甲基四氢苯酐和促进剂苄基二甲胺后，有机蒙脱土容易被剥离而得到剥离型的纳米复合材料，而用4，4’-二胺基二苯基甲烷固化剂未能使有机蒙脱土剥离后形成插层型纳米复合材料。     

MMT/EP纳米复合材料的热学和力学性能研究

用原位聚合法制备了蒙脱土／环氧树脂(MMT／EP)纳米复合材料．使用X射线衍射(XRD)和透射电镜(TEM)表征了复合材料的结构,并对其力学、热学等性能进行了研究．结果表明,复合材料在有机蒙脱土质量分数为2％时,与纯环氧树脂相比,冲击强度提高了21％,马丁耐热温度和最大热分解速率温度均提高5℃,同时固化线性收缩率也有所降低．     

聚丙烯/聚丙烯接枝丙烯酸/蒙脱土纳米复合材料的制备及性能

用悬浮接枝法制备了接枝率为2．2％的聚丙烯接枝丙烯酸作为相容剂，用十六烷基三甲基溴化铵对钠基蒙脱土进行了有机化处理，使蒙脱土的层间距从1．2nm增加到了3．84nm。通过熔融插层法制备了插层型聚丙烯／蒙脱土纳米复合材料(Polyprpropylcnc／Mommorillonite Nanocomposites．PNC)，复合材料中蒙脱土层间距比有机蒙脱土的层间距又有小幅度的增加。当蒙脱土含量为2％，相容剂量为15％时的复合材料力学性能最好，缺口冲击强度和拉伸强度分别达到12．12kJ／m^2。和35．77MPa，分别比纯PP增加了180％和4．3％，蒙脱土的加入起到了增韧和增强的双重作用。     

聚丙烯/聚丙烯接枝丙烯酸/蒙脱土纳米复合材料的制备及性能

用悬浮接枝法制备了接枝率为2 2%的聚丙烯接枝丙烯酸作为相容剂,用十六烷基三甲基溴化铵对钠基蒙脱土进行了有机化处理,使蒙脱土的层间距从1 2nm增加到了3 84nm。通过熔融插层法制备了插层型聚丙烯/蒙脱土纳米复合材料(Polypropylene/MontmorilloniteNanocomposites,PNC),复合材料中蒙脱土层间距比有机蒙脱土的层间距又有小幅度的增加。当蒙脱土含量为2%,相容剂用量为15%时的复合材料力学性能最好,缺口冲击强度和拉伸强度分别达到12 12kJ/m2和35 77MPa,分别比纯1PP增加了180%和4 3%,蒙脱土的加入起到了增韧和增强的双重作用。     

酚醛树脂/偶联剂改性蒙脱土的制备及性能研究

分别通过水解法和非水解法制备了硅烷偶联剂KH-560改性蒙脱土,并合成了酚醛树脂/改性蒙脱土纳米复合材料。采用傅里叶红外光谱(FTIR)、X射线衍射(XRD)对蒙脱土结构进行了表征,通过透射电镜(TEM)和热重分析(TG)研究了酚醛树脂/有机蒙脱土纳米复合材料的结构和热性能。TEM测试发现非水解法改性蒙脱土可与酚醛树脂形成剥离纳米结构,而水解法改性蒙脱土与酚醛树脂形成了剥离和插层的复合结构;TG分析显示2种改性蒙脱土均可提高酚醛树脂的热性能。     

橡胶/有机蒙脱土纳米复合材料的研究进展

介绍了蒙脱土的结构及有机化改性的方法，橡胶／有机蒙脱土纳米复合材料的制备原理和方法。同时，介绍了纳米复合材料的结构表征手段，然后对该复合材料的国内外研究现状作了综述，并对其进一步应用作了展望。     

PVC/蒙脱土复合材料的制备与性能研究

用乳液聚合的方法制备聚甲基丙烯酸甲酯(PMMA)/蒙脱土纳米复合材料.XRD分析表明PMMA嵌入了蒙脱土层间.使层间距明显扩大.用熔融共混的方法制备PVC/有机化蒙脱土复合材料并对其结构、力学性能、流变性能进行研究,证明该纳米复合材料能有效提高PVC的力学性能.     

改性剂对EVOH/蒙脱土纳米复合材料 性能影响的研究

对双十八烷基二甲基氯化铵改性后的蒙脱土进行红外(FTIR),X射线(XRD),扫描电镜(SEM)表征;同时采用偶联剂对有机蒙脱土进行二次改性,然后用溶液插层法制备了EVOH/蒙脱土纳米复合膜,并对复合膜性能进行测试.结果表明:改性后的蒙脱土表面由亲水变为疏水,层距由1.470 am增大到3.529 nm;而用质量分数为5%的硅烷偶联剂KH550改性的有机蒙脱土与EVOH制得的复合膜力学性能、阻隔性能得到了较好的提高,同时复合膜的透明性没受到影响.     

600 mesh silicon carbide corona protection varnish with epoxy/OMMT nano-composite adhesive

A new corona protection varnish was prepared by using epoxy/montmorillonite nano-composite and pure epoxy resin as adhesives respectively. The adhesive with different amounts of organic montmorillonite (OMMT) was mixed with 1200 mesh silicon carbide (SiC) by different weight ratios. The surface states of the varnishes with various adhesives were observed by powerful optical microscope. Some properties of the varnishes were analyzed during the enduring time under 5kV/cm DC, such as the relation of change in nonlinear coefficient, natural surface resistivity, and surface temperature variation. The results showed that the amounts of OMMT had little effect on the natural surface resistance of the varnish but had important influence on the nonlinear property of the varnish. When the range of the OMMT content was 2wt% to 6wt%, the nonlinear coefficient of all materials with epoxy/OMMT nano-composite adhesive was higher than that with pure epoxy resin adhesive. The surface temperature of the varnish with epoxy/OMMT nanocomposite adhesive was all lower than that with the pure epoxy resin adhesive under high electrical field strength.     

Synthesis and Properties of Novel Epoxidized Soybean Oil-modified Phenolic Resin/Montmorillonite Nanoeomposites

The novel epoxidized soybean oil-modified-phenolic resin/clay nanocomposites(ESO-M-PR/CN)was prepared.The coupling agent-benzyldimethylphenylammonium chloride [C6H5CH2N+(CH3)2C6H5Cl-,B2MP]was adopted to modify the interface between the organic and inorganic phases.The effect of the nanocomposite structure on its physical and chemical properties was discussed.During the synthesizing process of ESO-M-PR/CN,the phenol hydroxyl was etherified by ESO or ESO epoxy resin prepolymer to provide long ESO epoxy segments.Long ESO epoxy resin chain segments enhanced the crosslink density of ESO-M-PR/CN.The thermal and mechanical properties exhibit a significant improvement.The temperature at which a weight loss of 5%Occurs increases from 287.1℃to 402.3℃.The flexural strength increases by 25%,while the flexural modulus increases by 39%.Moreover,the properties of resin were enhanced by the effect of the inorganic nanoparticles,while the size of the nanomontmorillonites in the phenolic resin was characterized with a scanning electron microscope.The particle size of inorganic montmorillonites in the modified system is less than 100 nm.     

Synthesis and properties of novel epoxidized soybean oilmodified phenolic resin/montmorillonite nanocomposites

The novel epoxidized soybean oil-modified-phenolic resin/clay nanocomposites（ESO-M-PR/ CN） was prepared. The coupling agent-benzyldimethylphenylammonium chloride [C6H5CH2N^＋（CH3）2C6H5Cl^- , B2MP] was adopted to modify the interface between the organic and inorganic phases. The effect of the nanocomposite structure on its physical and chemical properties was discussed. During the synthesizing process of ESO-M-PR/CN, the phenol hydroxyl was etherified by ESO or ESO epoxy resin prepolymer to provide long ESO epoxy segments. Long ESO epoxy resin chain segments enhanced the crosslink density of ESO-M- PR/CN. The thermal and mechanical properties exhibit a significant improvement. The temperature at which a weight loss of 5% occurs increases from 287.1 ℃ to 402.3 ℃. The flexural strength increases by 25%, while the flexural modulus increases by 39%. Moreover, the properties of resin were enhanced by the effect of the inorganic nanoparticles, while the size of the nanomontmorillonites in the phenolic resin was characterized with a scanning electron microscope. The particle size of inorganic montmorillonites in the modified system is less than 100 nm.     

改性蒙脱石及其不饱和聚酯树脂纳米复合材料

以天然钙基膨润土为原料,制备稳定的钠基蒙脱石悬浮液.再以邻苯二甲酸为改性剂,Co2＋作为沉淀剂,制备有机蒙脱石,并探索了原料配比对蒙脱石改性效果的影响.XRD表明：经邻苯二甲酸改性的蒙脱石d001层间距被撑开到1.31823 nm,说明部分有机物进入到蒙脱石层间,制备出了半剥离状态的有机蒙脱石.将制得的有机蒙脱石与不饱和聚酯树脂原位复合,并对复合材料的冲击强度进行测试.结果表明：与纯不饱和聚酯树脂相比,当有机土的添加量为3%时,复合材料的冲击强度是不饱和聚酯树脂的1.43倍.     

橡胶/粘土协同增韧环氧树脂的研究

采用橡胶/粘土协同增韧环氧树脂,通过扫描电镜(SEM)和X射线衍射仪(XRD)对环氧树脂/橡胶/粘土复合材料的结构进行了研究,同时还研究了其力学性能.结果表明:纳米粘土和橡胶之间存在明显的协同增韧效应.从冲击断面的SEM分析可知,改性后的复合材料呈现明显的韧性断裂.XRD结果表明,粘土结构以插层结构为主,粘土片层间距由2.3nm增加到3.5nm以上.复合体系解决了单纯橡胶增韧环氧树脂时带来的强度和耐热性差的问题,使复合材料的力学性能和热性能均有一定的改善.     

Structural characteristics and properties of PU-modified TDE-85/MeTHPA epoxy resin

Diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate (TDE-85)/methyl tetrahydro-phthalic anhydride (MeTHPA) epoxy resin was modified by polyurethane(PU), and its structural characteristics and properties were studied by infrared spectrum analysis (IR), scanning electronic microscopy (SEM), mechanics testing and thermogravimetric analysis (TG). The results indicate that epoxy polymeric network I and polyurethane polymeric network II are formed in the PU-modified TDE-85/MeTHPA epoxy resin. Meanwhile the PU-modified TDE-85/MeTHPA resins have heterogeneous structure. The miscibility between epoxy (EP) and polyurethane (PU) as well as the phase size are dominantly determined by the mass fraction of polyurethane prepolymer (PUP) in the EP/PU blends. With the increase of PUP mass fraction, the tensile strength, impact strength and thermal stability of the PU-modified TDE-85/MeTHPA epoxy resin all firstly exhibit increasing tendency, and decrease after successively reaching their maxima. When the number-average molecular mass of PPG is 1 000 and the mass fraction of PUP is 15%, the tensile strength, impact strength and thermal stability of materials obtained, compared with TDE-85/MeTHPA epoxy resin, are improved obviously.     

不饱和环氧树脂透水性混凝土物理力学性能的试验研究

以水泥作为胶凝材料的透水性混凝土存在强度低，耐酸、耐碳化性差，渗透水呈强碱性而污染地下水等技术问题．本文以高强、耐酸、无污染的不饱和环氧树脂替代水泥作为胶凝材料，对其透水性混凝土进行了相对密度、空隙率、透水系数、抗折强度、抗压强度等物理力学性能试验．     

Preparation of Intercalated Clay/Phenolic Resin Nanocomposites under High Pressure

High pressure method was ased for the first time to produce rectorite clay （REC）/phenolic resin （PF） and organic rectorite clay （OREC） /phenolic resin and montmorillonite（ MMT）lphenolic resin （PF） nanocomposites. The structure of the material phase was studied by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Fourier transform infrared （ FT- IR ） spectroscopy, thermogravimetric analysis （ TGA ）, and atomic force microscopg＂ （AFM）. The experimental results show that intercalated clay/resin nanocomposites could form under normal temperature and high pressure conditions by the intercalation of polymeric molecules rather than interlayer polymerization.     

丙烯酸酯改性己二胺固化剂对环氧树脂性能的影响

利用丙烯酸酯类对己二胺进行改性,作为环氧树脂的室温固化剂。利用红外光谱分析了固化剂的氨解变化,讨论了改性固化剂对环氧树脂固化反应产物的拉伸、弯曲、冲击等性能的影响。实验结果表明,丙烯酸酯改性的己二胺固化剂可以在室温下固化环氧树脂,所得的环氧树脂具有较好的力学性能。