耐磨型尼龙—6合金的摩擦行为研究

用ＭＨＫ－５００和ＳＲＶ型磨损试验机测试了ＰＡ－６／ＰＥ合金的摩擦性能。结果表明，ＰＡ－６／ＰＥ合金的摩擦系数显著低于ＰＡ－６，而且克服了ＰＡ－６摩擦过程中的粘－滑现象，提高了ＰＡ－６的摩擦稳定性。     

SMPAH在PA6／ABS合金中的相容化作用研究

采用（苯乙烯／马来酸酐）共聚物（ＳＭＡＨ）作相容剂，通过熔融共混制备了ＰＡ６／ＡＢＳ合金。对三种牌号ＡＢＳ树脂进行了选择，通过不同ＳＭＡＨ含量的ＰＡ６／ＡＢＳ合金的力学性能、熔体流动速度、动态力学性能，以及微观结构剖析，分析了ＳＭＡＨ的相容化机理。     

车用尼龙合金PA6／PP的研制

制备了马来酸酐接枝ＰＰ作为ＰＡ６／ＰＰ合金的相容剂，研究了相容剂对ＰＡ６／ＰＰ合金结构与性能的影响，以及原料和工艺对合金性能的影响。     

衣康酸接枝PP增容PA6／PP合金的研究

以马来酸酐接枝ＰＰ（ＭＰＰ）作对照,研究了衣康酸接枝ＰＰ（ＩＰＰ）的熔体流动速率（ＭＦＲ）、接枝率（ＧＲ）妆枝配方的关系,ＰＡ６／接枝ＰＰ／ＰＰ合金的力学性能与接枝ＰＰ的特征参数、用量和合金组成比的关系。结果表明,ＩＰＰ对ＰＡ６／ＰＰ的增容效率明显高于ＭＰＰ,并具有显著提高材料冲击韧性的作用,可作为ＰＡ／ＰＰ高效增容剂兼增韧剂应用。     

溶液法马来酸酐接枝EPDM的研究及对尼龙的相容,增韧效应

本文介绍采用溶液法制备马来酸酐（ＭＡＨ）接枝乙丙橡胶（ＥＰＤＭ）以及该接枝物对尼龙（ＰＡ）的相容、增韧效应。研究了引发剂ＢＰＯ和ＭＡＨ用量与接枝率、接枝效率、交量的关系，当ＭＡＨ／ＥＰＤＭ为１０／１００（质量比，下同）时，ＢＰＯ／ＥＰＤＭ的最佳值约为２．２８／１００；固定ＢＰＯ／ＥＰＤＭ为１０／１００时，ＭＡＨ／ＥＰＤＭ的最佳值约为１２．５／１００。由Ｍｏｌａｕ实验表明，ＭＡＨ接枝ＥＰＤＭ／ＰＡ比     

PA—66／（PE／EPDM）—g—MAH共混增韧的研究

本文研究了尼龙－６６（ＰＡ－６６）与聚乙烯（ＬＤＰＥ）共混物的力学性能。结果表明，用马来酸酐接枝聚乙烯和三元乙丙橡胶（ＥＰＤＭ）改善了与基体ＰＡ－６６的相容性。添加弹性体ＥＰＤＭ，使之生成（ＰＥ／ＥＰＤＭ）－ｇ－ＭＡＨ共聚物，可以大幅度地提高ＰＡ－６６／（ＰＥ／ＥＰＤＭ）－ｇ－ＭＡＨ冲击强度，同时熔体粘度随温度的变化趋于平缓，吸水率有所下降。     

PO／PS合金的相态结构与力学性能

以氢化ＳＢＳ（ＳＥＢＳ）为增容剂的聚烯烃／聚苯乙烯（ＰＯ／ＰＳ）合金，与聚烯烃相比具有更好的力学性能，尤其是抗冲击强度随机容剂的增加而大幅度提高，应用ＴＥＭ，ＳＥＭ、ＤＳＣ、偏光显微技术对一系列合金相形态，相容程度及分散相颗粒尺的考察研究发现，合金中分散相多数呈卵石状，随ＳＥＢＳ含量增加，分散相粒径显著变小，而合金抗冲击强度增大，分散相形态结构。颗粒尺寸与材料力学性能密切相联。     

PP／PA—6合金的力学性能与相态结构

通过对ＰＰ／ＰＡ＝６合金的相态结构及力学性能的研究，发现ＰＰ／ＰＡ－６合 相态结构与是加入相容剂有关，屈服强度是合金中ＰＡ－６的体积含量的函数，缺口冲击强度主要取决于分散相颗粒表面间距，并且可以用经验公式描述。     

反应性加工PA-6/TPO-g-MAH共混物的研究

采用反应性挤出制备了ＰＡ６／ ＴＰＯｇＭＡＨ 超韧尼龙,研究了合金产品的性能,结果表明,当ＰＡ６∶ＴＰＯｇＭＡＨ 用量比７０∶３０ 时,合金的冲击强度比纯ＰＡ－ ６ 提高了约４ 倍,刚性降低不大,具有和弹性体超韧尼龙相同的力学性能。     

非弹性体增韧尼龙结构与性能

根据非弹性体增韧机理，研究了以马来酸酐接枝ＰＰ作为ＰＡ６和ＰＰ共混制备ＰＡ／ＰＰ合金的相容剂，对金结构与性能的影响。结果表明，相容剂大大改善了合金的形态结构，使合金冲击强度大幅度提高，且得到综合性能优良的ＰＡ６／ＰＰ合金。     

Physical Properties of Polyblends of Polyamide 6 Polymer with Cationic Dyeable Polyamide 6 Polymer

Polyamide 6 (PA 6) and cationic dyeable polyamide 6 (CD-PA 6) polymers were blended mechanically in the proportions of 75/25, 50/50, 25/75 in a melt twin-screw extruder to prepare three PA 6/CD-PA 6 polyblended polymers. The molar ratio of dimethyl 5-sulfoisophthalate sodium salt (SIPM) for CD-PA 6 polymer was 2%. This study investigated the physical properties of PA 6/CD-PA 6 polyblended materials using gel permeation chromatograph (GPC), nuclear magnetic resonance (NMR), gas chromatography (GC), potentiometer, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the density gradient method, a rheometer, and extension stress–strain measurement. Experimental results of the DSC indicated PA 6 and CD-PA 6 molecules easily formed miscible domains. The surface of PA 6/CD-PA 6 polyblend exhibited a uniform morphology from the scanning electron microscope (SEM). The SEM observations of morphologies were consistent with the DSC results for PA 6/CD-PA 6 polyblends. PA 6 and CD-PA 6 polymers were proven to be a compatible system. Flow behavior of PA 6/CD-PA 6 polyblends exhibited positive-deviation blends (PDB) and the 50/50 blend of PA 6/CD-PA 6 showed a maximum value of the melt viscosity. The crystallinities of PA 6/CD-PA 6 polyblends declined as a SIPM content increased. Moreover, the crystallinity of DSC method was slightly less than that of the density gradient method. The weight loss percentages of the PA 6/CD-PA 6 polyblends increased as the SIPM content increased in aqueous NaOH solution.     

永久抗静电PA6/ABS材料的制备

采用双螺杆挤出的方法将永久型抗静电母粒与尼龙(PA)6、(丙烯腈/丁二烯/苯乙烯)共聚物(ABS)熔融共混,制得永久型抗静电PA6/ABS材料.研究表明,适量马来酸酐接枝ABS的加入,可以显著提高ABS和PA6的相容性;随着永久型抗静电母粒用量的增加,PA6/ABS合金材料的表面电阻率明显下降,20%～30%的抗静电母粒可使PA6/ABS材料的表面电阻率达到1×107～1×108Ω,一年之后仍保持为1×108Ω,具有永久抗静电性能;抗静电PA6/ABS材料具有优异的可染色性.     

Poly(ethylene‐graft‐ethylene oxide) (PE‐PEO) and poly(ethylene‐co‐acrylic acid) (PEAA) as compatibilizers in blends of LDPE and polyamide‐6

In a blend of two immiscible polymers a controlled morphology can be obtained by adding a block or graft copolymer as compatibilizer. In the present work blends of low‐density polyethylene (PE) and polyamide‐6 (PA‐6) were prepared by melt mixing the polymers in a co‐rotating, intermeshing twin‐screw extruder. Poly(ethylene‐graft‐polyethylene oxide) (PE‐PEO), synthesized from poly(ethylene‐co‐acrylic acid) (PEAA) (backbone) and poly(ethylene oxide) monomethyl ether (MPEO) (grafts), was added as compatibilizer. As a comparison, the unmodified backbone polymer, PEAA, was used. The morphology of the blends was studied by scanning electron microscopy (SEM). Melting and crystallization behavior of the blends was investigated by differential scanning calorimetry (DSC) and mechanical properties by tensile testing. The compatibilizing mechanisms were different for the two copolymers, and generated two different blend morphologies. Addition of PE‐PEO gave a material with small, well‐dispersed PA‐spheres having good adhesion to the PE matrix, whereas PEAA generated a morphology characterized by small PA‐spheres agglomerated to larger structures. Both compatibilized PE/PA blends had much improved mechanical properties compared with the uncompatibilized blend, with elongation at break (ε_b) increasing up to 200%. Addition of compatibilizer to the PE/PA blends stabilized the morphology towards coalescence and significantly reduced the size of the dispersed phase domains, from an average diameter of 20 μm in the unmodified PE/PA blend to approximately 1 μm in the compatibilized blends. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2416–2424, 2000     

国产装置纺制2100dtexPA6纤维的工艺优化选择

介绍了在国产装置上通过对影响产品质量的主要因素进行对比试验和工艺的优化,开发生产出2100dtexPA6纤维.找到了最佳工艺,并得出侧吹风风速及其分布的稳定和拉伸机皮压辊的工况是制约产品质量好坏的关键.     

聚苯醚改性尼龙6及性能探讨

以尼龙6(PA6)为基体树脂,添加聚苯醚(PPO)制备PA6/PPO共混合金,同时添加乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯三元共聚物(8900)、乙烯-丙烯酸甲酯共聚物(1125)、马来酸酐接枝聚苯醚(PPO-g-MAH)等相容剂对PA6/PPO合金进行增容改性。探讨了聚苯醚和相容剂对合金力学性能、耐热性能、加工性能和吸水性能的影响,同时利用荧光光谱技术考察了体系的相容性。实验结果表明,添加5wt%聚苯醚和5wt%相容剂8900时,所制得的合金具有较优异的综合性能。     

The effect of morphology on the flame‐retardant behaviors of melamine cyanurate in PA6 composites

Three types of melamine cyanurate (MCA) with micrometer‐size sphere‐like, micrometer‐scale rod‐like, and nanometer‐scale flake‐like morphologies were synthesized by changing the chemical circumstances of the reactions. The microcosmic morphologies of MCA were characterized via scanning electron microscopy and X‐ray diffraction. After the MCAs with different morphologies were incorporated into polyamide 6 (PA6), the flame‐retardant properties of the MCA/PA6 composites were investigated using the limited oxygen index (LOI), UL94, and cone calorimeter tests. The MCA/PA6 composites with nanometer‐scale flake‐like MCA obtained an LOI value of 29.5% and a UL94 V‐0 rating, which were higher than those with micrometer‐size sphere‐like and rod‐like MCAs. However, the different morphologies did not affect the heat release rate, total smoke release, average carbon monoxide yield, and average carbon dioxide yield based on the cone calorimeter. The flame‐retardant mechanism of MCAs with different morphologies was investigated via thermal gravimetric analysis (TGA) and TGA‐Fourier transform infrared spectra. The results show that the different morphologies of MCA resulted in different dispersed evenness of MCA. Further, the nanometer‐scale flake‐like morphology of MCA brought more interactions of hydrogen bond between MCA and PA6, which resulted in the delay of MCA decomposition and the enhancement of MCA flame‐retardant effect. The nanometer‐scale flake‐like MCA had a better performance compared with the other samples because of the delaying and even release of flame‐retardant effect by the decomposition of evenly dispersed MCA. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40558.     

ABS/PA6合金研究进展

介绍了PA6/ABS合金在国内外发展状况、当前ABS/PA6合金技术发展趋势、相容剂种类及其各组成对PA6/ABS合金性能的影响。     

Confined crystallization phenomena in immiscible polymer blends with dispersed micro - and nanometer sized PA6 droplets, part 1: uncompatibilized PS/PA6, (PPE/PS)/PA6 and PPE/PA6 blends

In this paper the crystallization behavior of PA6, dispersed as droplets in various immiscible amorphous polymer matrices, is reported. PA6 was melt-mixed at various compositions with PS, (PPE/PS 50/50 wt/wt) and PPE using twin-screw extrusion. The phase morphologies of the obtained blends were analysed using SEM, etching experiments and image analysis. The crystallization behavior of PA6 was investigated by dynamic and isothermal DSC experiments. In case PA6 is dispersed as droplets, fractionated crystallization behavior occurs, characterized by several crystallization events at different, lowered crystallization temperatures. It is found to depend on the blend morphology (size of the droplets) and the thermal history of the samples (heterogeneous nucleation density). The PA6 droplet size distribution is shown to strongly influence the crystallization behavior of the droplets. Vitrification of the matrix appears to cause nucleation in the droplets at the interface. Decreasing the PA6 droplet size results in slower overall crystallization rates.     

Structure-property relationships of microfibrillar reinforced blends of linear polycondensates

Binary microfibrillar reinforced composites are obtained by melt-blending of poly(ethylene terephthalate) (PET) and polyamide 6 (PA6), as well as polyamide 66 (PA66) and PA6 (both 40/60 by wt) in the presence of a catalyst, followed by cold drawing of the bristle to about 3.5 times and annealing at 220 or 240C. The blends are studied by X-ray diffraction, scanning electron microscopy (SEM), light microscopy and static mechanical testing. SEM and light microscopy reveal different blend morphologies due to differences in the miscibility of the homopolymers: the PA66/PA6 blend is morphologically more homogeneous, than the PET/PA6 blend. Annealing at 240C results in preservation of the high orientation of PET and PA66 while the PA6 portions of the two blends are partially disoriented, much more for the PET/PA6 blend as concluded from the X-ray data. Annealing at 240C suggest also transreactions leading to the in situ generation of block copolymers in addition to the generated ones during blend mixing in the extruder which improve the compatibility of the blend components. These physical and chemical changes affect the mechanical properties of the fibrillar reinforced blends and composites. The Young's moduli (E) and tensile strength ( σ t ) of the drawn blends are 5-6 and 7-9 times higher than those of the asextruded samples. Heat treatment at 220C results in a slight (for PA66/PA6) and stronger (for PET'PA6 blend) decrease of the σ t while E remains unchanged. A stronger decrease of E in both blends and of σ t in PA66/PA6 sample has been observed after annealing at 240C. Nevertheless, E and σ t of the last samples are about 3 times higher than those for the neat PA6.