芳纶浆粕与聚己内酰胺复合的初步研究

对芳纶浆粕与聚己内酰胺复合进行了初步研究，实验表明，随芳浆粕含量的增加，复合材料的断裂伸长率和缺口冲击强度下降，拉伸屈服强度增加，拉伸断裂强度先降后增，芳浆粕是聚己内酰胺的α成核剂，复合材料的维卡热变形温度大幅度提高，熔体粘度增加，但粘流活化能不变。对芳纶浆粕进行浸渍处理可提高共混效果。     

包覆型MCA/PA6复合材料的制备及其阻燃性研究

以水为反应介质、无水乙醇为溶剂,将正硅酸四乙酯(TEOS)制备成二氧化硅(SiO_2)溶胶,利用溶胶的网络结构对三聚氰胺氰尿酸盐(MCA)进行表面包覆,制备出包覆型MCA阻燃剂;通过熔融共混方式,将包覆前后MCA与聚己内酰胺(PA 6)切片混合制备成不同阻燃剂含量的阻燃PA 6复合材料;采用红外光谱仪X射线光电子能谱仪、差示扫描量热仪、热重分析仪、垂直燃烧法和极限氧指数法等研究了阻燃PA 6复合材料的结构、热性能及阻燃性能。结果表明:SiO_2溶胶成功接枝在MCA表面,且主要分子结构没有发生改变;随着阻燃剂含量的增加,PA 6复合材料的熔点均有降低,但下降幅度较小;包覆型MCA在材料燃烧过程中能够有效参与成炭,在材料表面形成致密的保护层,增强PA 6复合材料的凝聚相阻燃效果,提高其阻燃性能;随着阻燃剂含量增加,PA 6复合材料的阻燃性逐步提高,添加包覆型MCA质量分数为8%时,PA 6复合材料阻燃性可达到UL-94 V-0等级,极限氧指数为28%。     

PA6/载银沸石共混物结晶及流变性能的研究

将载银沸石与聚己内酰胺(PA6)进行共混,经熔融挤出制备PA6/载银沸石共混切片,并进行了结晶形态及流变性能分析.结果表明:PA6中载银沸石的引入产生了异相成核结晶,使PA6球晶变小,结晶度提高;PA6/载银沸石共混体系为假塑性流体,其表观粘度随剪切速率的增大而减小,随温度升高而降低,随着载银沸石含量的增加而减小;共混...     

液体冷却温度对PP/PP-g-马来酸酐/PA6共混单丝结构与性能的影响

采用一定比例的聚己内酰胺(PA6)及增容剂对聚丙烯(PP)进行共混改性,纺制大直径单丝。通过对共混单丝的力学性能、扫描电子显微镜及热性能测试分析,研究了液体冷却成形温度对共混单丝拉伸强度、勾结强度的影响。结果表明:液体冷却温度对PP/PP-g-MAH/PA6共混单丝的力学性能具有很大的影响。随着液体冷却温度的下降,共混纤维的拉伸强度及勾结强度都得到不同程度的提高。     

分析测试

20096245 阳离子可染聚己内酰胺/阳离子可染聚对苯二甲酸丙二酯共混聚合物纤维的流变性、热性能、结晶性、强度和密度Shu Y.C.…;Journal of Applied Polymer Science,2007,106(1),p.644(英)由熔融双螺杆挤压机挤压阳离子可染聚己内酰胺(CD-PCA)和阳离子可染聚对苯二甲酸丙二酯(CD-     

木质素/高分子复合材料的研究进展

将木质素与其他高分子材料共混,在保证良好相容性的前提下,可以得到具备耐热、抗老化、耐紫外辐射等特殊性能且成本低廉的复合材料,同时木质素的可生物降解性也可以移植到复合材料中。介绍了木质素共混高分子复合材料的研究进展,根据基体材料种类及与木质素相容性的不同,对木质素/高分子复合材料进行分类介绍,并指出了在相容性方面存在的一些问题。     

PA6/PE共混纺丝中圆盘静态混合器的应用研究

采用聚己内酰胺/聚乙烯(PA6/PE)熔体共混纺丝,对纺丝组件中装有不同套数的圆盘静态混合器的应用效果进行了研究。结果表明:纺丝组件中装了圆盘静态混合器,与原组件相比,其PA6,PE共混的分布均匀性及细化程度较好;静态混合圆盘的数量越多,共混物料的分布均匀性与细化程度越好;装有3套(6块)静态混合圆盘的应用效果较好,所得PA6/PE共混纤维横截面及纵向表面规整,没有孔洞,纺丝时无断头,卷绕成形良好。     

可完全生物降解PBS的共混改性研究进展

综述了近年来国内外聚丁二酸丁二醇酯(PBS)共混改性的研究,包括PBS/淀粉复合材料、PBS/无机材料复合材料、PBS/植物纤维复合材料、PBS/其他聚合物复合材料的制备方法与性能,并展望了其发展前景。     

溶液共混制备ABS/PANI导电复合材料的研究

采用溶液共混分散聚苯胺（PANI），并用凝固浴去除溶剂制备了电学性能优良的（丙烯腈／丁二烯／苯乙烯）共聚物（ABS）／PANI导电复合材料。研究了溶剂用量、温度、PANI含量等因素对PANI分散性及导电复合材料电导率的影响，比较了溶液共混与机械共混的分散效果。偏光显微镜观测结果表明，溶液共混具有很好的分散能力，PANI的分散效果依赖其溶解率；电导率测试分析得出PANI在ABS中的逾渗阈值约为0．5％。     

PET／EPDM／蒙脱土复合材料的性能研究

以聚对苯二甲酸乙二醇酯（PET）为基体，以三元乙丙橡胶（EPDM）为弹性体，用熔融共混的方法制备了不同比例的PET／EPDM／蒙脱土（MMT）复合体系。用原子力显微镜、扫描电子显微镜研究了复合材料的微观结构，并测试了力学性能。结果表明MMT含量较低时，用熔融共混的方法能制得PKT／EPDM／MMT纳米复合材料EPDM及增容剂的引入都较大程度地改善了复合材料的缺口冲击强度。     

Polymer whiskers of poly(4-hydroxybenzoate): Reinforcement efficiency in composites with polyamides

The reinforcing efficiency of polymer whiskers of poly(4-hydroxybenzoate) (PHB) in poly-amide-6 (PA-6) and polyamide-11 (PA-11) composites was investigated by tensile testing, scanning electron microscopy (SEM), and density measurements. The composites were prepared by mixing the whiskers into the melts of the polyamides. Ductile and stiff PA-6-composites with different crystallinities of the PA-6-matrix were investigated. In the ductile PA-6 (low crystallinity) composites, the elastic modulus E and the yield stress σ_f increase more than twice at a whisker content of 2 vol %. The increase in E and σ_f in stiff PA-6 (high crystallinity) composites is not as pronounced as in the ductile PA-6 composites, but is still remarkably higher than in the PA-11 composites, which is about 1.2 times at a whisker content of 2 vol %. At higher whisker content, the PA-6 composites show the opposite of the PA-11-composite—no further increase in E and σ_f, which may be due to an agglomoration of whiskers in the high viscous PA-6 melt. The different tensile properties of the composites can be explained by SEM analysis of the fracture surfaces, which shows that the adhesion of PA-6 to the PHB whiskers is better than of PA-11. This is due to a higher number of hydrogen bonds between the PA-6 and the whisker surface. Density measurements show that the crystallinity of the polyamides is not affected by the PHB whiskers. © 1996 John Wiley & Sons, Inc.     

In situ polymer/polymer composites from poly(ethylene terephthalate), polyamide-6, and polyamide-66 blends

In situ reinforced binary and ternary polymer/polymer composites are obtained by the melt blending of poly(ethylene terephthalate) (PET), polyamide-6 (PA-6), and polyamide-66 (PA-66) in an extruder in the presence of a catalyst, followed by drawing of the extrudate and annealing of the drawn blends. The blends were studied by DSC, X-ray, SEM, and mechanical testing. After drawing, all the components were found to be oriented, forming microfibrils with diameters of about 1–2 μm. The chemical nature of the homopolymers affects the blends' morphologies; while the PA-66/PA-6 blend is homogeneous, phase separation is established in the case of PET/PA-6. The decrease in the enthalpy of melting of the blend components as well as the depression of their peaks of crystallization from the melt, compared to pure homopolymers, are indications that block copolymers have been formed via interchange reactions during the blending process. On the one hand, these copolymers improve the compatibility of the homopolymers, and on the other hand, they alter the chemical composition of the blends. After thermal treatment at 245°C, i.e., above the T_m of PA-6, the latter undergoes some disorientation, while PET and PA-66 retain their microfibrillar shape, and in this way, a compositelike structure is created. The presence of chemical bonds between the separate phases via copolymers favors the cocrystallization of PA-66 and PA-6 as well as the cooperative crystallization of PET, PA-6, and PA-66, both modes fostering improved compatibility (adhesion) of the blend components. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67: 723–737, 1998     

溶胀处理煤对煤结构与煤基聚苯胺导电性影响

首次选用苯胺为溶剂对神府煤(SFC)进行溶胀处理,以研究其对煤结构与煤基聚苯胺导电性的影响,对其结构进行TG/DSC、FTIR和SEM分析,并通过溶胀SFC处理煤为聚合基体,在苯胺和引发剂条件下聚合为煤基聚苯胺,测定了其导电率。结果表明:苯胺溶胀处理破坏了煤中非共价键,降低了煤的交联缔合度,疏松了煤的孔结构,在此条件下的煤基聚苯胺的导电率均小于溶胀处理前原煤为聚合基体的煤基聚苯胺导电率,这与煤大分子网络结构受到一定程度破坏有关,这可为煤基聚苯胺的扩大化生产提供重要参考。     

煤基石墨烯及复合材料在储能领域的应用

石墨烯及复合材料具有比表面积大、电导率高、导热性能和力学性能良好等优点,在电极材料、传感器、储氢材料等领域具有广泛的应用。但以高碳含量的天然资源煤为前体制备煤基石墨烯及复合材料达到煤炭清洁高效利用的研究目前报道有限,尤其是将其作为电极材料应用到储能领域的研究较少。本文重点总结了以不同煤质及衍生物为原料构建不同形貌和结构的煤基石墨烯及复合材料的方法以及存在的问题,详细介绍了煤基石墨烯及复合材料在储能领域,尤其是超级电容器、锂离子电池及钠离子电池领域的应用研究现状,最后提出了当前煤基石墨烯及复合材料的主要研究方向。该综述旨在为煤基新型石墨烯及复合材料的制备开发以及在储能领域的应用提供一定的思路。     

Studies on the Effect of Polyamide-6 onto Modified Polyphenylene Oxide Matrix in Presence of Fumaric Acid as a Compatibilizer

Polymer blends of modified polyphenylene oxide (mPPO) and polyamide-6 (PA-6) are immiscible and incompatible in nature. However fumaric acid (FA) is used as a compatibilizer for the compatibilizing of mPPO/PA-6 blend systems. During melt compounding functional groups of the polymer components were reacted in the presence of a compatibilizer in the extruder. The blends were characterized by using FTIR, SEM, and mechanical behavior testing. The concentration of FA compatibilizer varies inversely w.r.t. PA-6 concentration in the blend systems. However the blend composition of PA-6 (10%) shows good miscibility among the other blend systems under present study.     

基体粘度对PA-6／纳米CaCO3复合体系结构与性能的影响

研究了基体粘度对复合体系力学性能、吸水率和尺寸稳定性的影响。采用扫描电镜和透射电镜分析、观察了不同粘度基体的PA-6／纳米CaCO3复合体系冲击断面的微观形态，及纳米CaCO3粒子在不同粘度基体中的分散状况。结果表明，纳米CaCO3粒子在相对粘度较大的PA-6基体中更易分散，分散均匀性提高，冲击断面呈现韧性断面；适量的纳米CaCO3，能提高PA-6／CaCO3复合体系的冲击强度，特别是对粘度较大(R．V．=2．8dL／g)的基体，复合材料的冲击强度提高了40％。而体系的拉伸强度基本不降低。同时，纳米CaCO3的加入，能降低复合体系的吸水率，提高尺寸稳定性，与基体的粘度无关。     

Adhesive strength in the interaction of polyamides with aramid fibres

Wetting of organic fibres by polyamide melts was investigated. On the example of Terlon, it was shown that the contact angle of wetting increases in the order PA-610 < PA-6 < < PA-12. The polymers are also in the same order in wetting of a steel wire. Adhesion on the interface was investigated in the same systems. PA-610 in the form of powder exhibited maximum adhesion to steel wire and organic fibres. The necessity of using highly viscous matrices in the form of finely disperse systems for obtaining reliable and reproducible adhesive strength values was demonstrated. The validity of using steel wire as a model substrate was demonstrated and the qualitative characteristics of the change in the adhesive strength under the effect of factors which primarily alter the properties of the polymer matrix were found. The results obtained in studying the shear strength of the composites are correlated with the results of determining the adhesive strength in their unit cell. This allows recommending the shear method for evaluating adhesion in industrial conditions. Translated from Khimicheskie Volokna, No. 5, pp. 51–55, September–October, 1997.     

Study of the possibility of using oxidized pan twist in polymerization filling of polyamide 6

A comparative analysis of the structural features and process and physicomechanical properties of composites made from PA-6 and PAN-TW and PA-6 + PAN-OX demonstrated the effectiveness of using oxidized PAN twist in polymerization filling of PA-6.     

The role of core/shell-microparticle dispersions in polypropylene/polyamide-6 blends

Summary Reactive blending of 70 vol.-% polypropylene (PP) and 30 vol.-% polyamide-6 (PA-6) was performed in the presence of various amounts of succinic-anhydride-functional elastomers which are immiscible with both blend components. Characteristic morphological feature of the resulting multiphase polymer blends was a continuous polypropylene matrix containing dispersed core/shell microparticles with rigid polyamide-6 core and soft elastomer shell. Accumulation of the elastomer component at the polypropylene/polyamide-6 interface and reaction of the succinic anhydride of the elastomer with the amine-endgroups of PA-6 enhanced PA-6 dispersion and proved to be the key to unusual property synergisms. In contrast to the conventional soft maleicanhydride-grafted EPM elastomer (EPM-g-MAH), the stiffer maleic-anhydride-grafted poly[styrene-b-(ethene-co-butene-1)-b-styrene] (SEBS-g-MAH) was much more efficient as blend compatibilizer and gave PP/PA-6 blends with greatly improved strength and toughness without sacrificing stiffness.