尼龙12/OMMT纳米复合粉末的制备及性能

利用十八烷基三甲基溴化铵(OTAB)对蒙脱土(MMT)进行有机改性,并通过溶液插层法制备尼龙12/有机蒙脱土(PA12/OMMT)纳米复合粉末。利用X射线衍射、傅立叶变换红外光谱、扫描电子显微镜等手段对改性后的MMT及PA12/OMMT纳米复合粉末的结构和微观形貌进行表征,并将复合粉末热压成型制成标准件,测试其力学性能和热性能。结果表明,经过有机改性,MMT的层间距由1.24 nm增加到了2.13 nm,且改性后的MMT能均匀地分散在PA12基体中,PA12/OMMT纳米复合粉末的成型件在拉伸强度、弯曲强度、冲击强度和热性能方面都优于纯PA12粉末。PA12/OMMT纳米复合粉末为选择性激光烧结技术(SLS)提供了一种性能良好的粉末材料。     

乳液插层法制备丁苯橡胶/有机蒙脱土纳米复合材料

对蒙脱土(MMT)进行了有机化改性,采用乳液插层法制备了丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,用透射电子显微镜、X射线衍射法对OMMT及复合材料进行了表征,研究了复合材料的物理机械性能及动态力学性能.结果表明,MMT的层间距为1.47 nm,OMMT的层间距增大到2.94 nm;OMMT片层均匀分散在SBR基体中,具有良好的界面相容性;随着OMMT用量的增加,SBR/OMMT纳米复合材料的物理机械性能明显改善,且具有低填充量高增强效果的特点;SBR/OMMT纳米复合材料具有与SBR/炭黑N 330复合材料相当的抗湿滑性能,同时具有更小的滚动阻力.     

用原位有机改性法制备的溴化丁基橡胶／蒙脱土复合材料的性能

采用原位有机改性法制备了溴化丁基橡胶(BIIR)/蒙脱土(MMT)复合材料,并对其硫化特性和力学性能进行了研究,用X射线衍射仪时复合材料中MMT的层间距进行了表征,并与钠基蒙脱土(Na-MMT)、有机蒙脱土(OMMT)和BIIR形成的复合材料进行了对比.结果表明,用原位有机改性法制备的BIIR/MMT复合材料的硫化特性和力学性能优于BIIR/Na/MMT复合材料,甚至优于BIIR/OMMT复合材料;采用原位有机改性法,可使BIIR/MMT体系中MMT的插层效果明显改善.     

蒙脱土改性酚醛树脂复合材料的制备与性能研究

为提高酚醛树脂(PF)的热稳定性,利用原位插层法制备了PF/蒙脱土(MMT)、PF/有机化蒙脱土(OMMT)纳米复合材料,并比较了PF、PF/OMMT或PF/MMT经高温热处理后的力学性能和导电性能.研究表明,与PF复合后,OMMT和MMT都形成了剥离型的片层结构.与PF/OMMT复合材料相比,PF/MMT的质量保持率...     

新型有机蒙脱土的制备及其在聚丙烯改性中的应用

采用十六烷基三甲基溴化铵（CTAB） 、环氧树脂（EP）、异佛尔酮二异氰酸酯(IPDI)、十八胺(ODA)对钠基蒙脱土(MMT)进行干法插层改性, 分别制备了CMMT、EMMT、IMMT和OMMT等新型有机蒙脱土,并对聚丙烯(PP)进行熔融改性制得PP/OMMT纳米复合材料。通过傅里叶变换红外光谱仪、X射线衍射仪 、透射电子显微镜、差示扫描量热仪等分析手段对新型有机蒙脱土及纳米复合材料的结构形态及性能进行了研究。结果表明,OMMT层间距由蒙脱土的1.5626 nm扩大到4.2828 nm, OMMT片层均匀分散在PP基体中;当OMMT含量为5 %（质量分数,下同）时,纳米复合材料拉伸强度、断裂伸长率及冲击强度分别比纯PP提高了25.9 %、17.1 %和127.1 %;同时,加入OMMT后,PP的结晶度先升高后降低。     

环氧树脂改性聚乳酸/低熔点尼龙6/蒙脱土纳米复合材料结构与性能

通过熔融共混法制备了环氧树脂改性聚乳酸 (ePLA)/低熔点尼龙6 (LMPA6)/蒙脱土纳米复合材料。XRD和DSC结果表明,结晶度随着有机蒙脱土（OMMT）加入量的增加呈先增加后减小的趋势。流变行为结果表明,ePLA/LMPA6/OMMT纳米复合材料的黏性响应占主导地位,另外,随着OMMT加入量的增加,储能模量和损耗模量也增加。阻隔性能测试结果表明,OMMT的加入能够有效地改善纳米复合材料的阻隔性能。热重结果表明,OMMT的加入能够显著提高纳米复合材料的热稳定性能。TEM测试结果表明,OMMT加入量较少时,OMMT容易在基体中形成均一的纳米结构。力学性能分析表明,随着OMMT质量分数的增加,纳米复合材料的拉伸强度、断裂伸长率和冲击强度均出现先上升后下降的趋势,且当OMMT质量分数为3%时,纳米复合材料的力学性能均达到最大值,与未加OMMT时相比,分别提高了9.7%、37.8%和35.9%。     

原位聚合制备尼龙610/改性蒙脱土纳米复合材料的研究

采用增塑剂N-甲基苯磺酰胺对蒙脱土(MMT)进行改性,通过原位聚合法制备了尼龙(PA)610/改性MMT纳米复合材料。研究了改性MMT用量对PA610/改性MMT纳米复合材料性能的影响。结果表明,当改性MMT的质量分数为4%时,纳米复合材料的冲击强度和拉伸强度达到最大值,断裂伸长率则随着改性MMT用量的增加而降低。扫描电子显微镜观察发现,改性MMT均匀分散在PA610基体中。     

聚合物／蒙脱土纳米复合材料的研究进展

综述了蒙脱土(MMT)的结构特征、蒙脱土的有机化改性、聚合物/蒙脱土纳米复合材料(PMN)的制备方法以及聚合物/蒙脱土纳米复合材料的结构特性及性能特点。     

环氧树脂/蒙脱土纳米复合材料制备及性能的研究进展

介绍蒙脱土(MMT)的性质及其有机化改性,详细阐述了环氧树脂(EP)/MMT纳米复合材料的制备方法及其性能,以及MMT在EP中的剥离机理,指出实现MMT在EP基体中完全剥离的方法仍是目前制备EP/MMT纳米复合材料的关键问题.     

聚丙烯/纳米蒙脱土/高熔体强度聚丙烯复合材料的发泡行为水

利用线性聚丙烯(PP)和有机化处理的纳米蒙脱土(OMMT)在双螺杆挤出机上用熔融插层法制备PP/纳米OMMT 复合材料.通过在PP/纳米OMMT复合材料中加入少量的高熔体强度聚丙烯(HMS-PP),以模压发泡法制备了PP/0MMT和PP/HMs-PP/0MMT复合材料的发泡制品.利用扫描电镜研究了高熔体强度聚丙烯对PP/纳米0MMT复合材料发泡行为的影响.研究结果表明:HMS-PP的加入明显改善了PP的发泡性能,所得的泡孔密度增大,泡孔的合并现象明显改善.     

MMT的有机改性及其在PLA中的应用

介绍了蒙脱土（MMT）的一次有机改性和二次有机改性方法,并重点介绍了其在聚乳酸（PLA）中的应用。二次改性能有效改善有机改性蒙脱土（OMMT）在PLA中的分散状况,使之尽可能多地形成剥离结构;在性能改善方面,OMMT的添加能有效改善PLA的结晶性能、拉伸模量和冲击强度、热稳定性、阻透性能以及流变性能等。     

Structure and Property of PU/MMT Nanocomposites by In-Situ Polymerization

A montmorillonite modified by octadecylammonium salt (OMMT) was prepared. A polyurethane (PU)/montmorillonite nanocomposite was synthesized by in-situ polymerization using the OMMT, poly(propylene glycol), 4,4-diphenylmethylate diisocyanate, and 1,4-butanediol. The MMT platelets were dispersed in PU matrix on a 10 ～ 50 nm scale. Compared to that of pure PU, the tensile strength and tear strength of the PU/OMMT nanocomposites increased, respectively, and the MMT platelets dispersed on a nanometer scale enhanced the PU. The temperature of initial weight loss of the PU/OMMT nanocomposites was lower than that of pure PU because of the acid catalytic action of protonated MMT platelets in the first thermodegradation step. But its temperature of initial weight loss was higher than that of pure PU because of the barrier effect of the MMT platelets in the second thermodegradation step.     

Preparation of nanocomposite by adding of Tunisian nanoclay in unsaturated polyester matrix: mechanical and thermal study

Unsaturated Polyester (UP) resin is widely used for many applications such as reinforced plastic (FRP) and polymer composites. However, these materials suffer from their low mechanical and thermal properties. For enhancing their performance, researchers have used Tunisian montmorillonite (MMT) for manufacturing of unsaturated polyester-montmorillonite (UP-MMT) nanocomposite synthesized by dispersing the UP resin into the silicate layers of MMT. The MMT has been modified ammonium quaternary as organic cation (OMMT). Test results, supported by mechanical testing, X-ray diffraction, thermal analysis (DSC and TGA) and transmission electron microscopy, indicated that the mechanical properties and the thermal stability of unsaturated polyester with OMMT nanocomposite (UP/OMMT) are better than those of pure UP. The degradation temperature increased by 78 °C with the addition of organic modification, and SEM micrographs show good dispersion of modified montmorillonite in the polymer matrix. Tensile strength is increased by 81 % for the UP/OMMT nanocomposite.     

尼龙-6/蒙脱土的制备及用聚丁二烯改性的研究

以十六烷基三甲基溴化铵为有机插层剂对无机蒙脱土进行处理制备有机蒙脱土,采用原位聚合法制备尼龙-6/OMMT纳米复合材料,并在聚合过程中添加聚丁二烯合成PA-6/PB/OMMT纳米复合物.用FT-IR,XRD等对复合材料进行表征,并进行力学性能分析.实验表明,PB的加入能相对提高尼龙-6/OMMT的冲击强度,在PB含量为3%时,复合材料的拉伸性能和冲击性能较好.     

Influence of the type of quaternary ammonium salt used in the organic treatment of montmorillonite on the properties of poly(styrene‐co‐butyl acrylate)/layered silicate nanocomposites prepared by in situ miniemulsion polymerization

Hybrid latices of poly(styrene‐co‐butyl acrylate) were synthesized via in situ miniemulsion polymerization in the presence of 3 and 6 wt % organically modified montmorillonite (OMMT). Three different ammonium salts: cetyl trimethyl ammonium chloride (CTAC), alkyl dimethyl benzyl ammonium chloride (Dodigen), and distearyl dimethyl ammonium chloride (Praepagen), were investigated as organic modifiers. Increased affinity for organic liquids was observed after organic modification of the MMT. Stable hybrid latices were obtained even though miniemulsion stability was disturbed to some extent by the presence of the OMMTs during the synthesis. Highly intercalated and exfoliated polymer‐MMT nanocomposites films were produced with good MMT dispersion throughout the polymeric matrix. Materials containing MMT modified with the 16 carbons alkyl chain salt (CTAC) resulted in the largest increments of storage modulus, indicating that single chain quaternary salts provide higher increments on mechanical properties. Films presenting exfoliated structure resulted in the largest increments in the onset temperature of decomposition. For the range of OMMT loading studied, the nanocomposite structure influenced more significantly the thermal stability properties of the hybrid material than did the OMMT loading. The film containing 3 wt % MMT modified with the two 18 carbons alkyl chains salt (Praepagen) provided the highest increment of onset temperature of decomposition. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

HDPE/LLDPE/OMMT纳米复合材料的结构与性能

采用直接注射法制备HDPE/LLDPE/OMMT纳米复合材料,采用透射电子显微镜研究 HDPE/LLDPE/0MMT纳米复合材料的微观结构,研究有机蒙脱土含量对纳米复合材料性能的影响.透射电子显微镜结果显示,制备的HDPE/LLDPE/OMMT纳米复合材料是一种半剥离型的纳米复合材料.结果表明:蒙脱土的加入大大提高了纳米复合材料的力学性能和热变形温度.当有机蒙脱土质量含量仅为6%时,屈服强度和拉伸模量分别提高14.0%和59.7%,弯曲强度和弯曲模量分别提高了14.2%和60.O%.     

Chlorinated butyl rubber/two-step modified montmorillonite nanocomposites: Mechanical and damping properties

Montmorillonite (MMT) was modified by ultrasound and castor oil quaternary ammonium salt intercalation method to prepare a new type of organic montmorillonite (OMMT). The surface structure, particle morphology, interlayer distance, and thermal behavior of the samples obtained were characterized. The modified OMMT was then added to chlorinated butyl rubber (CIIR) by mechanical blending, and a composite material with excellent damping properties was obtained. The mechanical experiment results of CIIR nanocomposites showed that the addition of OMMT improved their tensile strength, hardness, and stress relaxation rate. Compared with pure CIIR, when the content of OMMT was 5 phr (part per hundred of rubber), the tensile strength of the nanocomposite was increased by 677% and the elongation at break was also increased by 105.4%. The enhancement of this performance was mainly due to the dispersion of the nanosheets in CIIR rubber and the chemical interaction between the organoclay and the polymer matrix, which was confirmed by morphology and spectral analysis. OMMT also endowed a positive effect on the damping properties of CIIR nanocomposites. After adding 5 phr of OMMT, the nanocomposite owned the best damping performance, and the damping factor, tanδ_max, was 37.9% higher than that of pure CIIR. Therefore, the good damping and mechanical properties of these CIIR nanocomposites provided some novel and promising methods for preparing high-damping rubber in a wide temperature range.     

废旧PE-HD/OMMT纳米复合材料热氧老化性能和燃烧性能研究

以废旧高密度聚乙烯（PE-HD）和蒙脱土（MMT）为原料,采用熔融插层法制备纳米复合材料,考查制备工艺对该材料热氧老化性能和燃烧性能的影响。结果表明,PE-HD复合MMT或有机蒙脱土（OMMT）后,抗热氧老化性能显著降低,阻燃性能增强;十六烷基三甲基溴化铵（CTAB）、OMMT、马来酸酐（MAH）和过氧化二异丙苯（DCP）加入量分别增加时,PE-HD/OMMT纳米复合材料的抗热氧老化性能无显著变化,阻燃性能呈现先增强后降低或稳定的趋势;当CTAB加入量为1 %、OMMT加入量为3 %、MAH和DCP加入量为1.5 %时,PE-HD/OMMT纳米复合材料的极限氧指数达到19.4 %,阻燃性能最好。     

阴离子开环聚合制备尼龙6/蒙脱土复合材料及其性能研究

以十六烷基三甲基溴化铵为有机插层剂对无机蒙脱土进行处理制得有机蒙脱土（OMMT），然后采用阴离子开环聚合，制备了尼龙6／蒙脱土复合材料。用FT-IR、TG和XRD对有机蒙脱土的插层情况进行了表征。结果表明，插层剂已插入蒙脱土片层中；当OMMT用量为2％时，复合材料的熔点最高，结晶度最大，力学性能最好。