环氧树脂/粘土纳米复合材料的研究

采用原位插层聚合法制备环氧树脂／粘土纳米复合材料，用X衍射（XRD），红外光谱（FTIR），差示扫描量热法（DSC），扫描电镜（SEM）对有机化蒙脱土（OMMT）和环氧树脂／粘土纳米复合材料进行测试与表征，结果表明，与纯环氧树脂固化物相比，环氧树脂／粘土纳米复合材料的力学，热学性能有较大的改善和提高。     

有机溶剂对有机粘土/丁腈橡胶纳米复合材料结构与性能的影响

采用预膨胀法对有机粘土进行预处理,研究有机溶剂的种类和用量对有机粘土/丁腈橡胶(NBR)纳米复合材料结构和性能的影响.结果表明:与熔体法相比,预膨胀法制备的有机粘土/NBR纳米复合材料的物理性能较好;当有机粘土/丙烯酸并用比为1 g:1 mL或有机粘土/正丁醇并用比为1g:4mL时,有机粘土/NBR纳米复合材料的物理性能最佳;与正丁醇为预膨胀剂时相比,丙烯酸作为预膨胀剂时制备的复合材料具有更好的物理性能和微观相态结构.     

纳米粘土增韧环氧树脂的研究

以蒙脱石为原料,通过HDTMAB改性制备纳米粘土,得到的最佳制备条件为:反应温度90℃,矿浆浓度5%,反应时间2h。在环氧树脂中加入5重量份纳米粘土,制得的纳米粘土/环氧树脂复合材料的冲击强度和弯曲强度,分别比纯环氧树脂提高303.2%和45.5%。实验证明纳米粘土对环氧树脂具有显著的增韧和增强效果。     

聚酰胺66/凹凸棒粘土纳米复合材料的制备及其性能研究

对商品凹凸棒粘土提纯、钠化、有机化后,与聚酰胺66(PA66)经双螺杆共混挤出得到PA66/凹凸棒粘土纳米复合材料。用透射电镜(TEM)和扫描电镜(SEM)研究了PA66/凹凸棒粘土纳米复合材料的微观结构,并测试了复合材料的力学性能和热性能。结果表明,凹凸棒粘土在PA66中达到纳米级分散,凹凸棒粘土的粒径小于100nm,并且在合适的添加量时复合材料的拉伸强度和热性能都有一定程度的提高。     

环氧树脂/阻燃剂/粘土纳米复合材料研究

以季戊四醇螺环磷酸脂双酚-S作为阻燃剂,制备了环氧树脂/阻燃剂/粘土(EP/FR/MMT)纳米复合材料。通过水平燃烧实验和力学性能测试研究了不同阻燃剂和粘土含量对材料性能的影响。结果表明,粘土质量分数2%时,阻燃剂质量分数15%时EP/FR/MMT纳米复合材料的阻燃性最好,燃烧长度17.6 mm,燃烧时间1.98 min,水平燃烧速率8.89 mm/min。粘土协同阻燃剂提高了环氧复合材料的阻燃性,同时由于粘土的加入,材料的拉伸强度明显提高。     

有机粘土/聚烯烃弹性体纳米复合材料的结构与性能

采用熔体插层法制备有机粘土/聚烯烃弹性体(POE)纳米复合材料,研究有机粘土起始片层间距及用量对复合材料结构与性能的影响.结果表明:POE分子链插层进入有机粘土片层之间形成插层结构,并且有机粘土起始层间距越大,所制备纳米复合材料的物理性能越好.随着有机粘土用量的增大,有机粘土/POE纳米复合材料物理性能逐渐提高.     

粉末涂料

<正>201709006基于环氧/粘土纳米复合材料的高性能粉末涂料的制备与表征[刊,英]/Sharifi,Mehrdad等//Prog.ress in Organic Coatings.-2017,106.-69~76采用溶液法和熔融分散法制备了环氧/粘土(Closite30B)纳米复合材料样品。采用XRD和TEM技术评估了环氧基料中的粘土的分散效果。制备的纳米复合材料     

纳米粘土/炭黑/天然橡胶复合材料动态性能的研究

以纳米粘土部分等量替代炭黑填充天然橡胶(NR),制备纳米粘土/炭黑/NR复合材料,研究纳米粘土用量对复合材料动态性能的影响。结果表明:当纳米粘土用量较小时,纳米粘土/炭黑/NR复合材料中填料分散性较好;与炭黑/NR复合材料相比,纳米粘土/炭黑/NR复合材料的滞后损失、动刚度和动静刚度比降低,当纳米粘土用量为2份时,复合材料的动态压缩生热和动静刚度比最低。     

固相法改性粘土及其在聚氯乙烯中的应用

首先采用固相法对粘土进行有机化插层改性,制得有机粘土,再通过熔融插层法制备聚氯乙烯/有机粘土复合材料。XRD表明固相法改性粘土可以与聚氯乙烯形成纳米复合材料。利用DSC研究了纳米复合材料的玻璃化转变温度,结果显示:聚氯乙烯/有机粘土纳米复合材料的玻璃化转变温度高于纯聚氯乙烯。     

环氧树脂/粘土纳米复合材料研究现状

描述了粘土的结构特征和有机化蒙脱土的制备，介绍了插层复合法的基本原理及其在环氧树脂／粘土纳米复合材料制备中的应用，以及近年来国内外环氧树脂／粘土纳米复合材料的研究现状。     

尼龙纳米复合材料的产品开发进展

介绍尼龙纳米复合材料的性能和制备方法,综述了近年来尼龙纳米复合材料的产品开发进展,比较了相关尼龙纳米复合材料与纯尼龙的性能,展望了尼龙纳米复合材料的应用前景。     

累托石/SBR纳米复合材料的结构与性能

采用乳液共混共凝法制备累托石／SBR复合材料，研究累托石纯度对材料物理性能的影响，并与蒙脱石／SBR复合材料进行对比。结果表明，累托石／SBR属于纳米复合材料，分散相的形状系数稍高于蒙脱石体系；高纯度累托石是制备性能优异的累托石／sBR纳米复合材料的关键。两种纳米复合材料均具有良好的气密性，累托石／SBR复合材料分散相形状系数略大，气密性更优。两者均可以作为性价比适中的轮胎气密层或内胎材料。     

聚苯胺-木质素磺酸纳米复合物的制备及吸附性能

以木质素磺酸(LS)为分散剂,采用静态聚合法制备了聚苯胺-木质素磺酸(PANI-LS)纳米复合物。通过扫描电子显微镜、透射电子显微镜、红外光谱、紫外可见光谱和广角X射线衍射对纳米复合物的形貌、结构和性能进行了表征。同时,研究了该纳米复合物对银离子的吸附性能。在银离子初始浓度为0.03 mol·L^-1时,PANI-LS纳米复合物对银离子的最大吸附容量为500 mg·g^-1。对吸附后纳米复合物的透射电子显微镜和广角X射线衍射的研究表明,PANI-LS纳米复合物对银离子具有还原作用,吸附后纳米复合物表面有直径为2～7 nm的单质银纳米粒子生成。     

累托石/NR纳米复合材料的结构与性能研究

研究乳液法和熔体法制备的累托石／NR纳米复合材料的结构与性能。结果表明,乳液法累托石／NR纳米复合材料为层间无高分子插入的隔离型纳米复合材料,熔体法累托石／NR纳米复合材料为典型的插层型纳米复合材料;当应变小于100％时,熔体法制备的复合材料应力较大,当应变大于100％时,乳液法制备的复合材料应力较大;当累托石用量较小时,乳液法制备的复合材料撕裂强度高于熔体法制备的复合材料;乳液法和熔体法制备的两种复合材料热稳定性差别不大,均好于纯NR。     

尼龙11/石墨烯氧化物纳米复合材料的动态流变性能

采用原位聚合法制备了尼龙11(Nylon 11,Polyamide 11)/石墨烯氧化物(GO)纳米复合材料,并利用旋转流变仪研究了纳米复合材料的流变行为。研究结果表明:尼龙11及其复合材料均为假塑性流体,呈现切力变稀的现象;GO的加入降低了尼龙11/GO纳米复合材料的储能模量、损耗模量和复数黏度;用Cole-Cole理论检测尼龙11/GO纳米复合材料,其曲线出现双峰,表明复合材料发生相分离,与Han曲线一致。     

UHMWPE/蒙脱土纳米复合材料滑动轴承的研制

采用蒙脱土(MMT)层间聚合改性和熔体插层方法制备了超高分子量聚乙烯(UHMWPE)／MMT纳米复合材料，并将复合材料注射成型为纯复合材料和复合型两类滑动轴承。研究了UHMWPE／MMT纳米复合材料的摩擦性能，结果表明，这是一种性能优异、成型简便的摩擦磨损材料。提出了该材料滑动轴承设计的基本要求，为实际应用提供了理论依据。     

Synthesis,characterization, and swelling kinetic study of porous superabsorbent hydrogel nanocomposite based on sulfonated carboxymethylcellulose and silica nanoparticles

New superabsorbent nanocomposite was synthesized by free-radical graft polymerization of sulfonated-carboxymethyl cellulose (SCMC) with acrylic acid (AA) in the presence of polyvinylpyrrolidone (PVP) and silica nanoparticles. Carboxymethyl cellulose (CMC) was first sulfonated using chlorosulfonic acid, and then AA monomers were grafted onto SCMC. FTIR results confirmed that sulfonation of CMC as well as grafting of AA monomers onto SCMC has been performed successfully. Moreover, the presence of silica nanoparticles into superabsorbent nanocomposite was evaluated with EDX analysis. The element mappings show a homogenous distribution of silica nanoparticles throughout the hydrogel nanocomposite. SEM images exhibited porous morphology for hydrogel nanocomposite, which was due to the incorporation of PVP in its network. The experimental findings from TGA analysis indicated that incorporation of PVP and silica nanoparticles into the hydrogel network improved thermal stability of superabsorbent nanocomposite. Swelling kinetic studies revealed that superabsorbent nanocomposite hydrogel had higher equilibrium swelling capacity and swelling rate compared with the neat hydrogel sample. Besides that, superabsorbent nanocomposite depicted excellent salt and pH-sensitive behavior in different saline and pH solutions. As a consequence, this hydrogel nanocomposite acts as useful water reservoir, which might be most profitable in agricultural applications.     

硬脂酸/膨润土纳米复合相变储热材料的制备、结构与性能

引　言相变储热技术可用于解决热能供给和需求失配的矛盾 ,在太阳能利用、电力的“移峰填谷”、废热和余热的回收利用以及工业与民用建筑采暖与空调的节能等领域具有广阔的应用前景[1] .其技术关键就是高性能相变储热材料的应用 .近年来 ,国内外学者不断致力于储热材料的研究工     

Effect of organoclay on the morphology,mechanical, and thermal properties of polyimide/organoclay nanocomposite foams

A series of polyimide (PI)/organoclay nanocomposite foams containing different contents of organoclay were prepared by the monomer in situ intercalative polymerization. The effect of organoclay on the chemical structure, morphology, mechanical, and thermal properties of the nanocomposite foams was studied. Fourier transform infrared spectra showed that the hydrogen bonds between organoclay and the polymer matrix were formed. X‐ray diffraction and transmission electron microscope results indicated that the organoclay were well dispersed in the PI matrix. The compressive strength and tensile strength of the nanocomposite foams enhanced significantly, especially for the nanocomposite foam containing 4 wt% organoclay, increasing by 15% and 9%, respectively, compared with these of the neat PI foam, and the presence of the organoclay in the PI foam improved apparently the cellular structure of the nanocomposite foams. Besides, thermogravimetric analysis revealed that the addition of organoclay improved the thermal stability of the nanocomposite foams strongly, and dynamic mechanical analysis indicated that the incorporation of organoclay significantly influenced the storage modulus of the nanocomposite foams. POLYM. COMPOS., 35:2311–2317, 2014. © 2014 Society of Plastics Engineers     

Preparation and characterization of silica sol/fluoroacrylate core–shell nanocomposite emulsion

The silica sol/fluoroacrylate core?Cshell nanocomposite emulsion was successfully synthesized via traditional emulsion polymerization through grafting of KH-570 onto silica particles. Comparing the performance of the polyacrylate copolymer, the fluorinated polyacrylate copolymer and the silica sol/fluoroacrylate core?Cshell nanocomposite emulsion, we can come to a conclusion that the silica sol/fluoroacrylate core?Cshell nanocomposite emulsion presents significantly excellent performance in all aspects. The products were characterized by Fourier transform infrared (FTIR), photon correlation spectroscopy (PCS), transmission electron microscopy (TEM), thermogravimetry (TGA), Contact angle and UV?Cvis analyses techniques. The chemical structure of polyacrylate copolymer, fluorinated polyacrylate copolymer and silica sol/fluoroacrylate nanocomposite were detected by FTIR. The size and stability of emulsion latex particles were determined by PCS technique. TEM analysis confirmed that the resultant latex particle has the core?Cshell structure, obviously. The water absorption and contact angle data also showed that the silica sol/fluoroacrylate nanocomposite film has good hydrophobic performance. TGA analysis indicated the weight loss of the silica sol/fluoroacrylate nanocomposite film begins at around 350?°C which testifies its good thermal stability. The UV?Cvis spectroscopy analysis showed that the silica sol/fluoroacrylate nanocomposite film possess UV?Cvis shielding effect when the added volume amount of KH570 modified silica sol is up to 5?mL. Therefore, the excellent properties of hydrophobicity, thermodynamics and resistance to ultraviolet provide the silica sol/fluoroacrylate nanocomposite film with potential applications in variety fields. In addition, the formation mechanism of core?Cshell structure silica sol/fluoroacrylate nanocomposite latex particles was speculated.