用单体插层原位聚合制备丁二烯橡胶/蒙脱土纳米复合材料

将单体插层原位聚合法引入到通用橡胶聚合中，采用阴离子取合制备了丁二烯橡胶/蒙脱土纳米复合材料，XRD分析显示蒙脱土层间距明显增大，表明实现了丁二烯插层原位聚合，FTIR分析显示蒙脱土的加入使得丁二烯橡胶微结构发生了改变。     

配位插层聚合法制备聚合物/蒙脱土纳米复合材料

综述了用单体配位插层聚合法制备聚合物/蒙脱土纳米复合材料的特点、操作过程及研究现状.该方法是采用微波加热技术用阳离子交换树脂将天然蒙脱土层间交换上过渡金属离子,利用单体与过渡金属离子之间的配位作用将单体引入蒙脱土层间,然后进行原位聚合制备聚合物/蒙脱土纳米复合材料.     

原位插层聚合法制备共聚酯/蒙脱土纳米复合材料

采用原位插层聚合法,制备了蒙脱土含量较高的共聚酯/蒙脱土纳米复合材料,意在做母料使用,含有该母料的聚合物复合材料的染色性能、吸湿浸润性能、抗静电性能及抗紫外性能等都有所改善。阐述了合适的共聚酯/蒙脱土纳米复合材料的制备工艺,讨论了制备过程中的影响因素,结果发现:在采用酯交换-缩聚反应釜进行原位插层聚合制备共聚酯/蒙脱土纳米复合材料的过程中,蒙脱土在缩聚釜中加入更符合生产实际;缩聚反应的实际过程证明了蒙脱土中含有的金属离子对缩聚反应有催化作用;另外,控制聚合的最终温度不超过278℃。最后,对共聚酯/蒙脱土纳米复合材料的结构进行了表征。     

原位悬浮聚合制备酸性酚醛树脂 /蒙脱土纳米复合材料

在酸性催化剂作用下,采用悬浮聚合的方法制备了酸性酚醛树脂/蒙脱土纳米复合材料。XRD和TEM的实验结果表明该材料结构为部分剥离、部分插层型,即一部分蒙脱土被剥离为单层,而另一部分为几个片层的聚集体。     

聚乙烯/蒙脱土纳米复合材料的制备及性能研究

以蒙脱土／十六烷基三甲基溴化铵作为前驱物负载Ziegler-Natta催化剂，通过插层原位聚合的方法制备了聚乙烯／蒙脱土纳米复合材料。对聚乙烯／蒙脱土纳米复合材料的制备规律进行了研究。用透射电镜、扫描电镜、XRD，DSC等手段研究了结构和性能的相互关系，以及蒙脱土的含量对复合材料熔点与结晶行为的影响。研究表明：蒙脱土的片层结构被破坏，并以纳米级均匀分散在聚合物基体中。蒙脱土的质量分数为3％左右时，聚乙烯／蒙脱土纳米复合材料具有优良的综合性能。     

原位聚合插层法制备氢化丁腈橡胶/有机蒙脱土纳米复合材料

通过原位聚合和混炼插层法制备了氢化丁腈橡胶（HNBR）／有机蒙脱土（OMMT）纳米复合材料,并对其结构、力学性能和耐热空气老化性能进行了研究。结果表明,有机蒙脱土以插层／剥离共存的结构分散在橡胶基体中。在178℃×96h的热空气老化条件下,HNBR／OMMT纳米复合材料的耐热空气老化性能优于高耐磨炭黑填充的HNBR复合材料。     

原位接枝插层法制备聚丙烯/蒙脱土纳米复合材料

采用原位接枝插层法制备了聚丙烯/蒙脱土纳米复合材料.借助长链有机胺有机化的蒙脱土在溶液中与马来酸酐和少量辅助溶胀剂进行溶胀;溶胀后的有机蒙脱土再与聚丙烯、适量引发剂在Haake混炼机中进行熔融反应,得到一种聚丙烯/蒙脱土接枝插层共混物;再将接枝插层共混物按一定比例与聚丙烯在Haake混炼机中进行混炼得到聚丙烯/蒙脱土纳米复合材料.用X射线衍射仪(XRD)、透射电镜(TEM)和热失重分析仪(TGA)分别对各步骤的产物进行表征.产物的XRD和TEM分析结果表明蒙脱土完全剥离并均匀分散在聚丙烯基体中,形成了真正的聚丙烯/蒙脱土纳米复合材料.TGA分析结果显示出该纳米复合材料具有相当好的热稳定性.     

聚乳酸/有机蒙脱土纳米插层复合材料的原位插层聚合工艺及结构表征研究

采用新疆夏子街钠基蒙脱土为原矿制备的有机蒙脱土和丙交酯,通过原位插层聚合方法,合成聚乳酸/有机蒙脱土纳米复合材料.通过对反应体系真空度、催化剂用量、反应温度、反应时间和OMMT 加入量等对工艺条件的研究,确定了最佳合成条件.结果为:反应体系真空度为0.085 MPa,催化剂用量为丙交酯质量的0.5%,聚合反应的温度控制在170 ℃,聚合反应时间7 h,OMMT加入量3%(质量含量).采用傅立叶红外光谱仪、X射线衍射仪、扫描电子显微镜、透射电子显微镜对聚乳酸/有机蒙脱土纳米插层复合材料的微观结构、相态等进行了表征和分析.     

插层法制备聚合物/蒙脱土纳米复合材料的研究进展

对插层法制备聚合物／蒙脱土纳米复合材料的国内外研究现状作了简要的回顾，并对聚合物／蒙脱土纳米复合材料的力学性能、结晶性能、阻隔性能、热稳定性、各向异性及阻燃性能进行了综述。     

用单体插层原位聚合制备丁二烯橡胶/蒙脱土纳米复合材料( 英文)

将单体插层原位聚合法引入到通用橡胶聚合中,采用阴离子聚合制备了丁二烯橡胶/蒙脱土纳米复合材料。XRD分析显示蒙脱土层间距明显增大,表明实现了丁二烯插层原位聚合。FTIR分析显示蒙脱土的加入使得丁二烯橡胶微观结构发生了改变。     

Preparation of polystyrene–graphite conducting nanocomposites via intercalation polymerization

In situ polymerization of styrene was conducted in the presence of expanded graphite obtained by rapid heating of a graphite intercalation compound (GIC), to form a polystyrene–expanded graphite conducting composite. The composite showed excellent electrically conducting properties even though the graphite content was much lower than in normal composites. The transition of the composite from an electrical insulator to an electrical semiconductor occurred when the graphite content was 1.8 wt%, which is much lower than that of conventional conducting polymer composites. TEM, SEM and other studies suggest that the graphite was dispersed in the form of nanosheets in a polymer matrix with a thickness of 10–30 nm, without modification of the space between carbon layers and the structure of the graphite crystallites. The composite exhibited high electrical conductivity of 10^?2 S cm^?1 when the graphite content was 2.8–3.0 wt%. This great improvement of conductivity could be attributed to the high aspect ratio (width‐to‐thickness) of the graphite nanosheets. The rolling process strongly affected the conductivity and the mechanical properties of the composite. © 2001 Society of Chemical Industry     

Preparation and characterization of poly(vinyl chloride)/organoclay nanocomposites by in situ intercalation

In this article, poly(vinyl chloride) (PVC)–organoclay nanocomposites were prepared via in situ polymerization intercalation and melt blending intercalation, respectively. Their nanostructures were characterized by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). Differences in the morphologies of the PVC hybrids prepared by in situ intercalation and melt intercalation were investigated. In addition, three kinds of organoclay were used, in order to consider the effect of the interlayer environment on intercalation. The results show that ammonium cations have a great influence on the hybrids prepared by melt intercalation, while they have no obvious effect on the nanostructures of the composites produced via in situ intercalation due to its distinctive process and its mechanism. Copyright © 2004 Society of Chemical Industry     

Boehmite-based polyethylene nanocomposites prepared by in-situ polymerization

Polyethylene (PE)-boehmite nanocomposites were prepared by means of metallocene/MAO-catalyzed in-situ polymerization of ethylene in the presence of boehmites, which were rendered organophilic by modification with carboxylic acids such as stearic acid and undecylenic acid. Such organoboehmites are readily dispersed in the polymerization media such as toluene. Polymerization activity, filler dispersion and mechanical properties of the nanocomposites were investigated as a function of type and concentration of the organoboehmites. The catalyst activity of different metallocenes (Cp₂ZrCl₂ and rac-Me₂Si(2-Me-benz[e]-Ind)₂ZrCl₂) was increased up to 100% in the presence of organoboehmite fillers. The dispersion of nanoboehmites, as evidenced by TEM studies, was dependent upon the content of the carboxylate modifier. At 20 wt.% carboxylate content uniform dispersions of organoboehmite particles with average particle sizes smaller than 100 nm were obtained. According to stress-strain measurements, the Young's modulus increased with increasing boehmite content without sacrificing high elongation at break.     

反应条件对原位聚合法制备PANI/CIP复合材料的影响

采用原位聚合法制备了核壳结构的聚苯胺(PANI)/羰基铁粉(CIP)复合材料,考察了掺杂酸种类、盐酸浓度、CIP用量、预搅拌时间等反应条件对反应过程及复合材料形貌和电导率的影响.以盐酸和对甲基苯磺酸为掺杂酸,均可得到核壳结构的PANI/CIP复合材料,但掺杂盐酸时综合效果较好.盐酸浓度为0.15 mol/L时制备PAN...     

Preparation of polymer/graphite conducting nanocomposite by intercalation polymerization

An in situ polymerization was conducted in the presence of expanded graphite obtained by rapid heating of the graphite intercalation compound (GIC) to form a polymer/expanded graphite conducting composite. Study showed that the graphite was dispersed in the form of nanosheets in the polymer matrix. The transition from an electrical insulator to an electrical semiconductor for the composite occurred when the expanded graphite content was 1.8 wt %, which was much lower than that of conventional conducting polymer composite. The composite exhibited high electrical conductivity of 10⁻² S/cm when the graphite content was 3.0 wt %. This great improvement of conductivity could be attributed to the high aspect ratio (width-to-thickness) of the graphite nanosheets. Study suggested that extensive rolling of the blend greatly affected the conductivity of the composite. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2506–2513, 2001     

原位聚合法制备聚苯胺/改性羰基铁粉复合材料

采用正硅酸乙酯(TEOS)对羰基铁粉(CIP)表面改性,通过原位聚合法制备了聚苯胺(PANI)/改性CIP复合材料。傅里叶变换红外光谱验证了SiO2和CIP表面形成了化学键。耐酸性实验表明:TEOS可在较长时间内保护CIP不被酸腐蚀,保证了制备PANI/CIP复合材料过程中CIP处于SiO2的有效保护下。所得复合材料为CIP表面包覆直径约20 nm均匀致密的PANI微粒,复合效果明显改善。复合材料电导率与CIP未改性前处于相同数量级。     

橡胶／粘土插层纳米复合材料的研究进展

综述了橡胶／粘土插层纳米复合材料的制备方法及性能特征。重点介绍了溶液插层法、乳液插层法和熔体插层法及相关研究进展。评价了各种制备技术的优缺点,提出了橡胶／粘土插层纳米复合材料的发展趋势。     

Preparation of poly(styrene‐co‐hexylacrylate)/cellulose whiskers nanocomposites via miniemulsion polymerization

A stable aqueous nanocomposite dispersion containing cellulose whiskers and a poly(styrene‐co‐hexylacrylate) matrix was prepared via miniemulsion polymerization. We were able to prepare a stable dispersion with a 20 wt % solid content and a cellulose whiskers content ranging from 1 up to 5 wt % based on polymer content. To avoid particle agglomeration leading to coagulum formation, the addition of a low amount of reactive silane, i.e., methacryloxypropyl triethoxysilane revealed to efficiently stabilize the dispersion. The nanocomposite dispersion was characterized using dynamic light scattering, transmission electron microscopy, and atomic force microscopy. Films obtained by casting followed by water evaporation and particle coalescence were analyzed by differential scanning calorimetry, dynamic mechanical analysis, and tensile testing. At 5 wt % whiskers loading, an enhancement by 500% of the storage modulus above the glass transition was determined. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Preparation of polystyrene–clay nanocomposites via dispersion polymerization using oligomeric styrene‐montmorillonite as stabilizer

This study describes the preparation of polystyrene–clay nanocomposite (PS‐nanocomposite) colloidal particles via free‐radical polymerization in dispersion. Montmorillonite clay (MMT) was pre‐modified using different concentrations of cationic styrene oligomeric (‘PS‐cationic’), and the subsequent modified PS‐MMT was used as stabilizer in the dispersion polymerization of styrene. The main objective of this study was to use the clay platelets as fillers to improve the thermal and mechanical properties of the final PS‐nanocomposites and as steric stabilizers in dispersion polymerization after modification with PS‐cationic. The correlation between the degree of clay modification and the morphology of the colloidal PS particles was investigated. The clay platelets were found to be encapsulated inside PS latex only when the clay surface was rendered highly hydrophobic, and stable polymer latex was obtained. The morphology of PS‐nanocomposite material (after film formation) was found to range from partially exfoliated to intercalated structure depending on the percentage of PS‐MMT loading. The impact of the modified clay loading on the monomer conversion, the polymer molecular weight, the thermal stability and the thermomechanical properties of the final PS‐nanocomposites was determined. Copyright © 2012 Society of Chemical Industry     

橡胶纳米复合材料的制备方法及研究进展

阐述了橡胶纳米复合材料4种制备方法的特点以及研究进展,分析了各种方法的优缺点,并对其应用前景进行了展望.