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有机插层剂对聚酰胺6/MMT纳米复合材料制备的影响研究 总被引:1,自引:0,他引:1
以烷基胺、季铵盐和氨基酸作为有机插层剂与蒙脱土片层进行阳离子交换,制备出层间距不同的有机蒙脱土。采用熔融插层法和原位聚合法分别制备聚酰胺(R%)/蒙脱土(MMT)纳米复合材料,并利用XRD、FT-IR、TEM对有机蒙脱土及纳米复合材料进行结构表征。研究结果表明:用烷基胺、季铵盐和氨基酸有机插层剂改性的蒙脱土层间距由原来的1.25nm分别增大到3.21nm、3.99nm和1.82m;季铵盐有机插层剂更适用于熔融插层法制备PA6/MMT纳米复合材料,而氨基酸有机插层剂更适用于原位聚合法制备PA6/MMT纳米复合材料。 相似文献
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将分子量分别为1400、2500、5000的聚苯乙烯长链端基季铵盐改性的蒙脱土(OMMT),与尼龙6(PA6)母料熔融共混,注塑成型制备PA6/OMMT纳米复合材料,讨论不同分子量的聚苯乙烯长链季铵盐有机改性蒙脱土对纳米复合材料性能的影响。对所制得的复合材料通过TGA和热变形测试、弯曲、拉伸和冲击性能等力学性能测试。结果表明:分子量为2500,蒙脱土含量为3%时的复合材料的热稳定性和综合力学性能较好。 相似文献
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采用两种不同类型的季磷盐对Na基黏土进行有机化插层改性制备出有机黏土;然后用熔融共混法制备了蒙脱土(MMT)/尼龙6(PA6)纳米复合材料样条,其中蒙脱土的加入量均为5%.XRD分析表明,PA6分子链很好地插入蒙脱土片层间,使层间距明显扩大.在室温下测量了复合材料样条的V型缺口冲击强度,实验数据表明,季磷盐改性蒙脱土的填充能有效提高PA6的冲击性能.应用分形理论进行定量分析,结果表明十八烷基三丁基季磷盐处理的黏土对PA6的改性效果优于另外一种季磷盐处理的黏土的改性效果. 相似文献
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以长链烷基季铵盐、带有羟基或苄基的有机季铵盐为插层剂,对钠基蒙脱土进行改性后得到了有机蒙脱土。在100份(质量,下同)EPDM中加入15份有机蒙脱土或40份高耐磨炭黑制备了二者的纳米复合材料。X射线衍射和透射电镜分析表明,由带有羟基插层剂改性的钠基蒙脱土制备的纳米复合材料为剥离型,而其他2种为插层型。有机蒙脱土填充的纳米复合材料的力学性能与高耐磨炭黑填充者相当。与EPDM相比,剥离型纳米复合材料的拉伸强度提高了3.4倍,透气率降低了近40%。 相似文献
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以高流动性聚丙烯接枝马来酸酐(PP-g-MAH)为载体树脂,制备了接枝聚丙烯/有机蒙脱土插层母料,并以此为增强剂制备了PA6/接枝聚丙烯/有机蒙脱土纳米复合材料,研究了有机蒙脱土(OMMT)含量对复合体系力学性能和耐热性能的影响。通过X射线衍射(XRD)、透射电子显微镜(TEM)研究了复合材料的微观结构。结果表明:在所制备的插层母料中,PP-g-MAH大分子能够部分插入OMMT的晶片层间,其层间距有所增大。母料法制备的PA6/接枝聚丙烯/有机蒙脱土纳米复合材料的力学性能得到了较大提高,当OMMT含量为6%时,拉伸强度和弯曲强度分别比PA6/PP-g-MAH共混体系提高了24%和25.1%。 相似文献
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周雪琴;盛仲夷;谢松桂;申屠宝卿;翁志学 《中国塑料》2010,24(2):47-51
采用环氧树脂改性蒙脱土(MMT)得到有机化蒙脱土(OMMT),再用熔融插层法制备了聚酰胺6 (PA6)/ OMMT纳米复合材料。采用X射线衍射仪、透射电子显微镜、万能材料试验机、热重分析仪等研究了PA6/OMMT复合材料的形态结构、力学性能和热稳定性。结果表明,经环氧树脂改性得到的OMMT的层间距明显增加,从未改性的1.22 nm增加到5.13 nm,并以纳米尺度分散于PA6基体中;随着OMMT含量的增加,PA6/ OMMT复合材料的强度和模量增加,热变形温度提高,其拉伸强度可达76 MPa,弯曲模量达到3.462 GPa,热变形温度为134 ℃;PA6/ OMMT复合材料失重10 %时的温度为422 ℃,比纯PA6的406 ℃提高了16 ℃,改善了PA6的热稳定性。 相似文献
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采用熔融插层法制备了尼龙6(PA6)/蒙脱土插层复合材料,通过X射线衍射仪、透射电镜等表征手段研究了该复合材料的微观结构,采用锥形量热仪、拉伸测试仪等测试了材料的阻燃性能、力学性能以及热变形温度。结果表明,有机蒙脱土片层的间距扩大了,PA6插入了有机蒙脱土片层之间。PA6/蒙脱土插层复合材料具有较低的热释放速率和质量损失,并且当有机蒙脱土质量分数为5%~7%时,该复合材料的综合性能最好。 相似文献
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D. García-López I. Gobernado-Mitre J. F. Fernández J. C. Merino J. M. Pastor 《Polymer Bulletin》2009,62(6):791-800
Nanocomposites based on polyamide 6 have been directly prepared by melt compounding, using modified low cost bentonites by
three selected quaternary ammonium cations, in particular quaternized octadecylamine (ODA), dimethyl benzyl hydrogenated tallow
quaternary ammonium (B2MTH) and dimethyl hydrogenated ditallow quaternary ammonium (2M2TH). Thermal stability of organic modifiers
and organoclays has been studied by TGA and results allow evaluating the degree of modifier incorporation into clay galleries.
The influence of the organic modifier on the morphology and properties of the obtained nanocomposites has been studied by
X-ray diffraction and TEM analysis. Depending on the degree of bentonite modification, different mechanisms were reported
to explain the improved mechanical properties of the resulting nanocomposites. 相似文献
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尼龙6/粘土纳米复合材料的性能 总被引:6,自引:1,他引:5
对尼龙6/粘土纳米复合材料(PA6CN)的力学性能、结晶性能、流变性能、热稳定性、阻隔性能、阻燃性能、各向异性和可纺性进行了综述。加入粘土后,基体尼龙6的晶型变为γ型,改善了尼龙6的力学性能,提高了热变形温度,降低了吸水率,改善了气体阻隔性和材料的阻燃性,拓宽了复合材料的应用范围。 相似文献
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A newly developed kind of layered clay, rectorite (REC), has been used to yield intercalated or exfoliated thermoplastic polyurethane rubber (TPUR) nanocomposites by melt‐processing intercalation. Because of the swollen layered structure of REC, similar to that of montmorillonite, organic rectorites (OREC) can also be obtained through ion‐exchange reaction with two different quaternary ammonium salts (QAS1, QAS2) and benzidine (QAS3). The microstructure and dispersibility of OREC layers in TPUR matrix were examined by X‐ray diffraction and transmission electron microscopy, which revealed not only that the composites with lower amounts of clay are intercalation or part exfoliation nanocomposites, but also that the mechanical properties of the composites were substantially enhanced. The maximum ultimate tensile strength for TPUR/OREC nanocomposites appeared at 2 wt % OREC loading. With increasing OREC contents, the tear strength of the composites increased significantly. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 608–614, 2004 相似文献
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用具有相同结构但不同烷基碳链长度的系列季铵盐制得CnTA+/蒙脱石纳米复合物,并对水溶液中邻苯二甲酸酯进行吸附实验。探讨了季铵盐烷基碳链链长和用量对制得的CnTA+/蒙脱石纳米复合物吸附水溶液中PAEs效果的影响。结果表明:CnTA+/蒙脱石纳米复合物能有效地吸附溶液中的PAEs,季铵盐烷基碳链链长及用量均对CnTA+/蒙脱石纳米复合物的吸附效果产生影响。当季铵盐用量较低时,随着季铵盐烷基链长的增加,PAEs的吸附去除率增加;增大季铵盐用量,随着季铵盐烷基链长的增加,PAEs的吸附去除率先增大后减小。 相似文献
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We report a novel compounding process using Na-montmorillonite water slurry for preparing novel nylon 6/Na-montmorillonite nanocomposites. In this compounding process, the Na-montmorillonite slurry was blended with melting nylon 6 using an extruder, followed by removing the water. The Na-montmorillonite silicate layers were found to be exfoliated and dispersed homogeneously at nanometer level in the nanocomposites with an electron transmission microscope. The exfoliated Na-montmorillonite silicate layers were fixed in the nylon 6 matrix almost as they were in water. The nylon 6/Na-montmorillonite nanocomposites, loaded with only 1.6 wt% clay silicate layers, exhibited high strength, high modulus, high heat distortion temperature and low gas permeability compared to neat nylon 6. The properties of the nylon 6/Na-montmorillonite nanocomposites were nearly equal to those of conventional nylon 6/clay nanocomposites prepared by dry-compounding nylon 6 and organophilic clay ion-exchanged with alkylammonium ions. 相似文献
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A carefully selected series of organic amine salts were ion exchanged with sodium montmorillonite to form organoclays varying in amine structure or exchange level relative to the clay. Each organoclay was melt-mixed with a high molecular grade of nylon 6 (HMW) using a twin screw extruder; some organoclays were also mixed with a low molecular grade of nylon 6 (LMW). Wide angle X-ray scattering, transmission electron microscopy, and stress-strain behavior were used to evaluate the effect of amine structure on nanocomposite morphology and physical properties. Three surfactant structural issues were found to significantly affect nanocomposite morphology and properties in the case of the HMW nylon 6: decreasing the number of long alkyl tails from two to one tallows, use of methyl rather than hydroxy-ethyl groups, and use of an equivalent amount of surfactant with the montmorillonite, as opposed to adding excess, lead to greater extents of silicate platelet exfoliation, increased moduli, higher yield strengths, and lower elongation at break. LMW nanocomposites exhibited similar surfactant structure-nanocomposite behavior. Overall, nanocomposites based on HMW nylon 6 exhibited higher extents of platelet exfoliation and better mechanical properties than nanocomposites formed from the LMW polyamide, regardless of the organoclay used. This trend is attributed to the higher melt viscosity and consequently the higher shear stresses generated during melt processing. 相似文献
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The preparation and properties of poly(4‐methyl‐1‐pentene) (PMP)/clay nano‐composites are described for the first time. The effect of clay modification and compatibilizer on the formation and properties of the nanocomposites is studied. Layered silicates modified with two types of quaternary ammonium salts are used. The X‐ray diffraction results indicate intercalation of the polymer into the intergallery spacing of the clay. Thermogravimetric analysis shows a delay in the degradation process. Dynamic mechanical analysis shows an increase in the storage modulus for the nanocomposites. The use of compatibilizer containing maleic anhydride and acrylic ester groups is explored. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3233–3238, 2003 相似文献