共查询到16条相似文献,搜索用时 156 毫秒
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研究了制备剥离型(苯乙烯/马来酸酐)共聚物(SMAH)蒙/脱土(MMT)纳米复合材料的方法。研究表明,通过原位插层及熔融插层只能制备出插层型的SMAH/MMT纳米复合材料。为了制备剥离型的SMAH/MMT纳米复合材料,先将尼龙6(PA6)与MMT熔融插层制备出PA6/MMT纳米复合材料,再用抽提的方法将PA6/MMT复合材料中的部分PA6除去,得到含有少量PA6的剥离型MMT,然后将剥离型MMT与SMAH共混,从而制备出剥离型的SMAH/MMT纳米复合材料。该复合材料的粘度低于SMAH,且具有较好的加工性能。 相似文献
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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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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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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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From in situ polycondensation, a poly(ethylene terephthalate)/Polyamide 6 copolymer/montmorillonite nanocomposite was prepared, after the treatment of montmorillonite (MMT) with a water soluble polymer. The resulting nanocomposites were characterized by X‐ray diffraction (XRD), differential scanning calorimeter (DSC), nuclear magnetic resonance (NMR), dynamic mechanical analysis (DMA), and transmission electron microscopy (TEM). The results of DSC, 1H NMR, and DMA proved that the nanocomposite synthesized was PET/PA6 copolymer/MMT nanocomposite, not the PET/PA6 blend/MMT nanocomposite. The results of XRD and TEM proved that the dispersion of MMT was improved observably after the introduction of PA6 molecular chain into PET. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2512–2517, 2006 相似文献
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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。 相似文献
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Thermal–oxidative degradation and accelerated aging behavior of polyamide 6/epoxy resin‐modified montmorillonite nanocomposites
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Polyamide 6 (PA6) nanocomposites based on epoxy resin‐modified montmorillonite (EP‐MMT) were prepared by melt processing using a typical twin‐screw extruder. X‐ray diffraction combined with transmission electron microscopy was applied to elucidate the structure and morphology of PA6/EP‐MMT nanocomposites, suggesting a nearly exfoliated structure in the nanocomposite with 2 wt % EP‐MMT (PA6/2EP‐MMT) and a partial exfoliated‐partial intercalated structure in PA6/4 wt %EP‐MMT nanocomposite (PA6/4EP‐MMT). The thermogravimetric analysis under air atmosphere was conducted to characterize the thermal–oxidative degradation behavior of the material, and the result indicated that the presence of EP‐MMT could inhibit the thermal‐oxidative degradation of PA6 effectively. Accelerated heat aging in an air circulating oven at 150°C was applied to assess the thermal–oxidative stability of PA6 nanocomposites through investigation of reduced viscosity, tensile properties, and chemical structure at various time intervals. The results indicated that the incorporation of EP‐MMT effectively enhanced the thermal–oxidative stability of PA6, resulting in the high retention of reduced viscosity and tensile strength, and the low ratio of terminal carboxyl group to amino group. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40825. 相似文献
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本文重点讨论了涤/棉针织物一浴法染色新工艺,包括精炼染涤一浴法、练漂染涤一浴一步法、先染涤后棉氧漂一浴两步法、分散/活性一浴一步法、分散/活性一浴两步法。对分散/活性两浴法染色节能工艺也进行了考察。实验结果表明:合理的染色工艺和适当的染化料能很好的保障染色质量,而且对提高生产效率、降低染色成本、减小环境污染都有很大帮助。 相似文献
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Polyamide 6/polypropylene (PA6/PP = 70/30 parts) blends containing 4 phr (parts per hundred resin) of organophilic montmorillonite (OMMT) were prepared by melt compounding. The sodium montmorillonite (Na‐MMT) was modified using three different types of alkyl ammonium salts, namely dodecylamine, 12‐aminolauric acid, and stearylamine. The effect of clay modification on the morphological and mechanical properties of PA6/PP nanocomposites was investigated using x‐ray diffraction (XRD), transmission electron microscopy (TEM), tensile, flexural, and impact tests. The thermal properties of PA6/PP nanocomposites were characterized using thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and heat distortion temperature (HDT). XRD and TEM results indicated the formation of exfoliated structure for the PA6/PP nanocomposites prepared using stearylamine modified montmorillonite. On the other hand, a mixture of intercalated and exfoliated structures was found for the PA6/PP nanocomposites prepared using 12‐aminolauric acid and dodecylamine modified montmorillonite. Incorporation of OMMT increased the stiffness but decreased the ductility and toughness of PA6/PP blend. The PA6/PP nanocomposite containing stearylamine modified montmorillonite showed the highest tensile, flexural, and thermal properties among all nanocomposites. This could be attributed to better exfoliated structure in the PA6/PP nanocomposite containing stearylamine modified montmorillonite. The storage modulus and HDT of PA6/PP blend were increased significantly with the incorporation of both Na‐MMT and OMMT. The highest value in both storage modulus and HDT was found in the PA6/PP nanocomposite containing stearylamine modified montmorillonite due to its better exfoliated structure. POLYM. COMPOS., 31:1156–1167, 2010. © 2009 Society of Plastics Engineers 相似文献
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Yijian Wu Yeting Shi Lizhi Zhu Zhixue Weng 《Polymer-Plastics Technology and Engineering》2015,54(7):682-690
Compatibilizer (styrene–maleic anhydride copolymer, SMA) and organo-montmorillonite (OMMT) were introduced into immiscible polyamide-6 (PA6)/ poly(phenylene oxide) (PPO) blend to obtain quaternary nanocomposites simply by melt extrusion. OMMT tactoids formed in PA6/PPO/OMMT ternary blend would become smaller or disappear with the addition of SMA. Besides, viscosity of SMA compatibilized PA6/PPO blend decreased a lot with the addition of OMMT. Based on these results, a mechanism for joint effect of SMA and OMMT in compatibilizing PA6 and PPO was proposed. We further studied water absorption and tensile properties of the nanocomposites, which were in consistent with the proposed mechanism. 相似文献