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EPDM/有机蒙脱土纳米复合材料的制备和性能研究 总被引:1,自引:0,他引:1
以EPDM接枝马来酸酐作相容剂,用一段密闭熔融混炼、二段开炼机混炼的方法制备了EPDM/有机蒙脱土(OMMT)纳米复合材料,并对其性能进行了研究。结果表明,熔融混炼使EPDM分子链开始插入OMMT片层间,致使OMMT片层间距有所增大;开炼机混炼使OMMT片层间距进一步增大;硫化后,OMMT片层剥离,以纳米级尺寸均匀分布于EPDM基体中。与EPDM胶料相比,EPDM/OMMT纳米复合材料的损耗因子小,玻璃化温度高,储能模量大,物理性能显著提高。 相似文献
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三元乙丙橡胶/蒙脱土纳米复合材料的制备与性能研究 总被引:5,自引:0,他引:5
采用熔融插层的方法制备了三元乙丙橡胶(EPDM)/蒙脱土纳米复合材料。X-射线衍射和透射电镜的研究结果表明,该材料的结构为插层型纳米分散结构。研究了蒙脱土用量对该复合材料的力学性能、光学性能和热性能的影响。实验结果表明,该纳米复合材料具有优良的力学性能。当蒙脱土的用量为15份时,该材料的拉伸强度和拉断伸长率分别为19.8MPa和540%。由过氧化物硫化剂2,5-二甲基-2,5-二叔丁基过氧己烷制备的EPDM/蒙脱土纳米复合材料是半透明的,蒙脱土用量对材料的透光率影响较小,蒙脱土用量几乎不影响材料的硫化性能。此外,材料的玻璃化转变温度和热分解温度也由于蒙脱土在基体中的纳米分散和基体与填料相互作用的增强而明显升高。 相似文献
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环氧树脂/蒙脱土纳米复合材料性能的研究 总被引:7,自引:0,他引:7
用一种新型的热稳定性较好的改性剂2,2’-二[4-(4-氨基苯氧基)苯基]-丙烷(BAPP)改性钠基蒙脱土,再与环氧树脂进行纳米复合制备了环氧树脂/蒙脱土纳米复合材料。讨论了蒙脱土用量对环氧树脂/蒙脱土纳米复合材料性能的影响,并对其结构和性能进行了表征和测试。结果表明:改性使蒙脱土层间距变大,制备出的环氧树脂/蒙脱土纳米复合材料剥离结构较好,环氧树脂/蒙脱土纳米复合材料的玻璃化转变温度和动态储能模量随改性蒙脱土用量的增加呈现较好的递增趋势。 相似文献
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由上海交通大学申请的专利(专利号CN1683449,公开日期2005—10—19)“乙丙橡胶/蒙脱土纳米复合材料的制备方法”,涉及的EPR/蒙脱土纳米复合材料由EPR、蒙脱土、插层剂、活性剂、促进剂和硫化剂组成。其制备方法为:首先将EPR、蒙脱土和插层剂加入密炼机(30~120℃)中进行混炼制得一段混炼胶,然后将一段混炼胶、 相似文献
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简要概述了蒙脱土的有机改性机理、聚烯烃/蒙脱土纳米复合材料的制备方法、结构与表征以及聚烯烃/蒙脱土纳米复合材料的研究进展。 相似文献
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聚丙烯/蒙脱土纳米复合材料的研究进展 总被引:9,自引:0,他引:9
戈明亮 《合成材料老化与应用》2003,32(1):29-33,49
介绍了聚丙烯/蒙脱土纳米复合材料的制备原理及插层方法。并对国内外的研究进展进行了综述,讨论了蒙脱土对聚丙烯结晶性能的影响。蒙脱土的加入聚丙烯有异相成核的作用。另外介绍了聚丙烯/蒙脱土纳米复合材料中蒙脱土对聚丙烯力学性能的影响。其力学性能随蒙脱土含量的增加先增加后下降。 相似文献
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Ethylene vinyl acetate copolymer (EVA) and monmorillonite (MMT) nanocomposites have been investigated as a function of vinyl acetate content and molecular weight of EVA and types of substituted alkyl ammonium of MMT. It is found that vinyl acetate content and type of substituted alkyl ammonium are important factors for the intercalation behaviour of MMT in MMT/EVA nanocomposite. Maleic anhydride grafted high‐density polyethylene was used as a compatibilizer to improve the intercalation behaviour of MMT. X‐ray diffraction and transmission electron microscopy were used to characterize the intercalation/exfoliation behaviour, and mechanical properties were measured. © 2003 Society of Chemical Industry 相似文献
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三元乙丙橡胶/蒙脱土纳米复合材料Ⅰ制备、表征及流变性能 总被引:3,自引:0,他引:3
用熔融插层和丙烯酰胺作为桥联剂成功地制备了三元乙丙橡胶(EPDM)/蒙脱土(MMT)纳米复合材料。X射线衍射(XRD)和透射电镜(TEM)的结果表明,形成的纳米复合材料为剥离型。研究了丙烯酰胺在该纳米复合材料制作中的桥联作用及材料的流变性能。结果表明:选择丙烯酰胺作为桥联剂,完全可以在熔融状态下制备EPDM/MMT纳米复合材料,随着有机粘土加入量的增加,复合体系的粘度降低,加工性能改善,而交联密度在经历最大值后下降,有机蒙脱土具有延迟硫化和促进硫化的双重功效。复合材料的力学性能有了极大的提高,这些性能与蒙脱土的精细分散结构有着密切的关系。 相似文献
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三元乙丙橡胶/黏土纳米复合材料 总被引:5,自引:1,他引:5
利用熔融插层和双羟基甲基十二烷基氯化铵插层剂改性黏土的方法,制备了三元乙丙橡胶/黏土纳米复合材料。X射线衍射(XRD)和透射电镜(TEM)的测试结果表明,形成的纳米复合材料为剥离型。探索了制作该纳米复合材料的最佳工艺方法。研究了这种材料的力学性能及老化性能,分析了该有机黏土增强橡胶的机理。结果表明,在对黏土进行有机改性时,插层剂中的双羟基与黏土中的氧原子形成了氢键,而使黏土层间的相互作用减弱,层间距增大,使三元乙丙橡胶(EPDM)分子链插入黏土层间而导致黏土剥离是该纳米材料形成的主要原因。有机黏土用量为15份时,试样的拉伸强度高迭24.9MPa,扯断伸长率为666%;前者比纯EPDM提高了3~4倍,后者上升了140%。试样的撕裂强度也有明显的改善,而邵尔A型硬度却随有机黏土用量的增加没有明显的变化。同时,试样的耐热老化性能也有了明显的改善. 相似文献
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A series of novel xerogels based on sodium acrylate (NaA), montmorillonite (MMT), and N,N′‐methylene‐bisacrylamide (NMBA) were prepared by inverse suspension polymerization and water solution polymerization. The influences of pure MMT, intercalated MMT, the method of polymerization, and the content of the MMT in the copolymeric gels on the water absorbency and the initial absorption rate in deionized water and various salt solutions were investigated. Results showed that the water absorbency was increased by adding a small amount of the pure MMT into the copolymeric gels, but decreased by adding intercalated MMT into the gels. In addition, the water absorbency of the gels prepared by water solution polymerization was lower than that prepared by inverse suspension polymerization. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3422–3429, 2004 相似文献
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The nonisothermal crystallization kinetics of polyoxymethylene (POM), polyoxymethylene/Na–montmorillonite (POM/Na–MMT), and polyoxymethylene/organic–montmorillonite (POM/organ–MMT) nanocomposites were investigated by differential scanning calorimetry at various cooling rates. The Avrami analysis modified by Jeziorny and a method developed by Mo were employed to describe the nonisothermal crystallization process of POM/Na–MMT and POM/organ–MMT nanocomposites. The difference in the values of the exponent n between POM and POM/montmorillonite nanocomposites suggests that the nonisothermal crystallization of POM/Na–MMT and POM/organ–MMT nanocomposites corresponds to a tridimensional growth with heterogeneous nucleation. The values of half‐time and the parameter Zc, which characterizes the kinetics of nonisothermal crystallization, show that the crystallization rate of either POM/Na–MMT or POM/organ–MMT nanocomposite is faster than that of virgin POM at a given cooling rate. The activation energies were evaluated by the Kissinger method and were 387.0, 330.3, and 328.6 kJ/mol for the nonisothermal crystallization of POM, POM/Na–MMT nanocomposite, and POM/organ–MMT nanocomposite, respectively. POM/montmorillonite nanocomposite can be as easily fabricated as the original polyoxymethylene, considering that the addition of montmorillonite, either Na–montmorillonite or organ–montmorillonite, may accelerate the overall nonisothermal crystallization process. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2281–2289, 2001 相似文献
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Young‐Wook Chang Yungchul Yang Seunghoon Ryu Changwoon Nah 《Polymer International》2002,51(4):319-324
Hybrid nanocomposites based on organophillic montmorillonite (MMT) and ethylene–propylene–diene rubber (EPDM) have been prepared by a melt compounding process. From analysis by X‐ray diffraction and transmission electron microscopy, the rubber molecules were found to be intercalated into the galleries of organoMMT and the silicate layers of organoMMT are uniformly dispersed as platelets of 50–80 nm thickness in the EPDM matrix. Dynamic mechanical studies reveal a strong rubber–filler interaction in the hybrid nanocomposite which is manifested in the lowering of tan δ at the glass transition temperature. The hybrid nanocomposites exhibit great improvement in tensile and tear strength, and modulus, as well as elongation‐at‐break. Moreover, the permeability of oxygen for the hybrid nanocomposite was reduced remarkably. © 2002 Society of Chemical Industry 相似文献
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新型相容剂对PP/蒙脱土纳米复合材料的影响 总被引:5,自引:0,他引:5
采用高接枝率的聚丙烯(PP)三单体固相接枝物(TMPP)为相容剂,制得PP/蒙脱土(MMT)纳米复合材料。研究了不同相容剂用量对纳米复合材料结构与性能的影响。结果表明,当ω(TMPP)和ω(MMT)均为3%时,纳米复合材料的最大结晶峰温度从PP的113.9℃提高到125.5℃;当m(TMPP)/m(MMT)为1:1时,纳米复合材料的弯曲强度提高25%,弯曲模量提高50%,相容剂含量继续增加,纳米复合材料的力学性能没有进一步提高;纳米复合材料热失重20%时的温度与PP相比提高了70℃。 相似文献