超细冰滑粉在MC尼龙中的应用

研究超细冰滑粉对MC尼龙的复配改性。结果表明,其制品具有填料分布均匀、色浅如白玉、外观光泽优良等特点;当添加10％的冰滑粉对其中冲击强度几乎不变;添加20％的冰滑粉时其拉伸强度保留率为85％,而压缩强度和压缩弹性模量均有提高。该类复配改性MC尼龙制品可望应用于受压构件或复层构件中的受压部位,有性能／价格比高的优势。     

超细滑石粉改性MC尼龙的研究

考察了超细滑石粉对MC尼龙复合材料物理力学性能的影响。结果表明,滑石粉与MC尼龙复合,显著地改善了制品的收缩率、吸水率,热变形温度提高24℃。制品具有填料分布均匀、外观光泽优良等优点。同时,加入滑石粉还可以降低MC尼龙制品的成本。硅烷偶联剂可以增加滑石粉与MC尼龙基体的相容性,使复合材料的冲击强度较MC尼龙提高11％。     

超细尼龙粉改性水性PU漆的机械性能与外观

在水性PU漆中添加超细尼龙12(PA12,商品名为Orgasol),可以改善水性PU漆的耐磨、耐擦划和耐污性。添加不同粒径的Orgasol可以获得柔和的砂纹效果,同时也可以改善涂膜的光泽、附着力和颜色。     

浇铸尼龙6/超细滑石粉复合材料的性能研究

采用超细滑石粉对浇铸尼龙6材料进行改性,对改性后复合材料的性能进行了研究。结果表明：在一定的配方组成下,超细滑石粉改性浇铸尼龙6复合材料与未改性前相比,尺寸稳定性、耐热性和热分解温度均有所提高,且光泽度基本保持不变,对浇铸尼龙6的应用普及有较大的实际意义。     

超细改性氢氧化铝的表面处理及其对尼龙66阻燃性能的影响

采用改性剂对超细改性氢氧化铝（CG-ATH）进行表面处理。考察了不同改性剂对CG-ATH表面改性效果的影响，通过透射电镜和扫描电镜观察了改性前后CG-ATH的颗粒形态及其在尼龙66中的分散情况，测定了氧指数，结果表明，改性后的CG-ATH在树脂中分散性好，在尼龙66中添加表面改性的CG-ATH，其氧指数从25%，提高到30%。     

增韧尼龙滑轮专用料的研制及应用

采用双螺杆挤出加工工艺,通过添加不同组分制得增强增韧尼龙材料,比较了尼龙品种、增韧剂、玻璃纤维及助剂对材料的改性效果,并分析了生产工艺对材料性能的影响,据此确定了材料的最佳工艺参数和配方,并成功应用在割草机滑轮制品上。     

Advark滚塑专用聚甲醛和尼龙亮相

位于美国新泽西州的塑料配混企业Advark聚合物公司最近首次向市场提供滚塑专用聚甲醛和尼龙树脂牌号。     

活性染料上染尼龙66织物染色工艺探讨

研究了活性染料上染尼龙66针织物的染色工艺。结果表明:在所试验的面料上染色温度为95℃,pH值为4,恒温上染时间为60分钟。在此工艺条件下,织物得色率较高,几乎无“横档”现象。     

尼龙66高铁专用材料的研究

采用双螺杆挤出加工工艺,对尼龙66材料增强增韧进行了研究,深入探讨了玻璃纤维、增韧剂及助剂等材料对尼龙66的性能影响,确定了合金复合尼龙材料的最佳工艺参数和配方,所制备的尼龙复合材料可以达到高铁用尼龙材料的性能要求.     

Effect of polymer microstructure on dye diffusion in polyamide 66 fibers

Our previous work showed that drawing polyamide 66 (PA 66) fibers at room temperature does not change the degree of crystallinity, but only increases the molecular orientation. We therefore have used a series PA 66 fibers with different draw ratios to establish a direct correlation between (noncrystalline) molecular orientation f_a and the dye diffusion coefficient D. For both acid and disperse dyes, the relationship log D ∝ f provides reasonable fits to the data for PA 66 fibers, and a similar relationship appears to be applicable to PA 6 fibers. Heat‐setting the fibers results in a continuous decrease in diffusion coefficient; unlike PA6 and PET fibers, no minimum in D was found in the region of 160°C. If this decrease in D is attributed to the increase in volume fraction crystallinity X taking place during heat‐setting, it must be deduced that log D ∝ X⁶. This dependence is surprisingly strong, but is consistent with observations we have made on PET and PA6 fibers. It is possible that some other structural rearrangement is partially or largely responsible for the decrease in diffusion coefficient, but Fourier transform infrared, density, and X‐ray diffraction measurements do not indicate any other structural changes taking place. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3803–3807, 2003     

Solvent system for steady state electrospinning of polyamide 6.6

A mixture of formic acid/acetic acid makes it possible to electrospin polyamide 6.6 in steady state conditions. Steady state conditions are essential in nozzle electrospinning to generate a stable process which fabricates reproducible material, permitting industrial upscaling. This study shows that only a limited mixture range of formic acid/acetic acid allows electrospinning of polyamide 6.6 in steady state. Furthermore, the weight concentration in solution; the tip to collector distance and the flow rate have been changed to control the average diameter of the nanofibres. The average diameter increases by increasing weight concentration in solution, increasing volume fraction of acetic acid in the mixture, increasing tip to collector distance and increasing flow rate. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Oxazoline‐containing compatibilizers for polyamide/SAN and polyamide/ABS blends

Polyamide (PA) and acrylonitrile/butadiene/styrene copolymer (ABS) may appear as a mixture in the recycled plastic stream. The incompatibility of these blends results in a blend with poor mechanical properties. The aim of this work is to partially convert the nitrile groups of the acrylonitrile/styrene copolymer (SAN) into oxazoline groups by reaction with aminoethanol (AE). Such modified SAN (SAN‐m) can react with the amine or carboxylic acid end groups of PA, and therefore used as compatibilizers for blends of PA with ABS. SAN‐m was found to reduce the SAN‐domain size in the PA/SAN‐blends. The initial acrylonitrile content of SAN‐m had a strong influence on the degree of conversion into oxazoline groups and on the compatibilizing effect. Mechanical properties of SAN‐m compatibilized PA/ABS blends were investigated. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 449–455, 2002     

Analyses of structures for a synthetic leather made of polyurethane and microfiber

A gradient extraction method was developed and used for a synthetic leather made of polyurethane (PU) and microfiber polycaprolactam (PA‐6), by which the two components were separated using DMF and formic acid as solvents, respectively. Their chemical structure was confirmed by FTIR spectra, and the result showed that the PU is a kind of polyester polyurethane with phenylene rings in the molecule. The condensed phase structure was analyzed using X‐ray diffraction (XRD). The crystallinity of the PA‐6 is about 65.6%, and for the PU, there was not distinct crystalline character shown in the XRD pattern but a phase separation structure of hard block‐soft block with the hard domains content about 58.7%. SEM images showed that the PA‐6 microfibers transfixing the PU matrix form a net bundle structure, and there are two kinds of porous structures in the synthetic leather, with one type of pore sized 5–80 μm between the components of PU and PA‐6, and the other in PU matrix with a size of 0.1–2 μm. The multipores run through the synthetic leather as three‐dimensional channels, benefit for transportation of air, water, dyes, and so on. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 903–908, 2007     

DBKB7108线路板专用可剥漆的研制

本文介绍了用于线路板的新型耐溶剂可剥漆的配方和性能指标。经实际应用表明，其性能指标达到国外同类产品先进水平。     

Polymer blends of carboxylated butadiene‐acrylonitrile copolymer (nitrile rubber) and polyamide 6 developed in twin screw extrusion

Polymer blends of carboxylated butadiene‐acrylonitrile copolymer (nitrile rubber) and polyamide 6 (PA6) were developed in twin screw extrusion. The rubber was cured with SP 1045 methylol phenolic resin during melt mixing in twin screw. Effect of degree of carboxylation in the rubber phase on blend properties has been assessed. Phase morphologies have been characterized using transmission electron microscopy. A compatibilizing NBR‐g‐Nylon 6 graft copolymer generated in situ during melt mixing via interfacial reaction between the ? COOH groups in NBR and the ? NH₂ end groups in nylon 6 has been effective in generating a fine and stable dispersion of the rubber within the polyamide matrix. The graft copolymer has been characterized by DMTA. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 372–377, 2007