三维编织碳纤维尼龙复合材料的研究

根据碱催化阴离子聚合原理，用液态原位聚合方法制备了尼龙／三维编织碳纤维复合材料（PA／C3D），介绍其成型工艺过程，测试并分析了PA／C3D复合材料的力学性能及影响因素。结果表明，PA／C3D复合材料具有比长碳纤维增强尼龙（PA／CL）复合材料高的冲击强度和剪切强度，其弯曲性能低于PA／CL复合材料。碳纤维空气氧化处理后制备的PA／C3D复合材料的弯曲强度、弯曲弹性模量及平面剪切强度均有所提高，但冲击强度下降。     

美国Impossible Objects与BASF联手开发3D打印复合材

<正>日前,美国公司Impossible Objects在"RAPIC TCT"3D打印展上发布两项公告称,该公司与BASF(美国)合作推出3D打印用碳纤维增强尼龙6(PA6)复合材料,并于近期开发出了新型3D打印设备CBAM-2。通过与BASF合作,Impossible Objects公司的Model One和CBAM-2型3D打印机将为BASF的Ultrasint PA6粉末提供打印支持,方便用户采用高性能碳纤维增强PA6复合材料生产零部件。据Impossible Objects公司称,碳纤维增强PA6复合材料跟PA12相比,具有更高的强度和更佳的温度特性,而成本却更低。碳纤维增强PA6复合材料部件的强度为传统熔融沉积工艺(FDM)部件的4倍,为射流熔融工艺(MJF)     

2005年尼龙开发与应用专题题录

PPS／PA6合金的研究,空心玻璃微珠填充MC尼龙复合材料的研究,GMA熔融接技SBS及其对PA6增容研究,尼龙口管材的生产工艺,碳纤维增强MC尼龙复合材料吸湿行为研究     

PA6/SANMAH/GF复合材料的制备及其性能研究

采用双螺杆挤出机通过熔融共混制备了尼龙6／（苯乙烯／丙烯腈／顺丁烯二酸酐）共聚物／玻璃纤维（PA6／SANMAH／GF）复合材料，测试了材料的拉伸强度、弯曲强度、弯曲弹性模量、缺口冲击强度、热变形温度、吸水率、熔点和熔融焓，并与GF增强PA6（PA6／GF）复合材料和GF增强PA6／（苯乙烯／丙烯腈）共聚物（PA6／SAN／GF）复合材料进行了性能对比。结果表明，在PA6与SANMAH的质量比为100：3—30时，PA6／SANMAH／GF复合材料的拉伸强度与PA6／GF复合材料相当，但高于PA6／SAN／GF复合材料，弯曲强度和弯曲弹性模量高于PA6／GF和PA6／SAN／GF复合材料．缺口冲击强度高于PA6／GF复合材料，但低于PA6／SAN／GF复合材料；在PA6与SANMAH的质量比为100：40时，PA6／SANMAH／GF复合材料的拉伸强度、弯曲强度和缺口冲击强度明显降低；在整个试验范围内，PA6／SANMAH／GF复合材料的热变形温度比PA6／GF和PA6／SAN／GF复合材料低4～7℃；吸水率随着SAN-MAH用量的增加而逐渐减小。     

西佛碱/尼龙6原位聚合复合材料的合成与表征

采用原位聚合方法制备了西佛碱(SD)刚性链／尼龙6(PA6)复合材料，并对其结构和热性能进行了表征。红外光谱和紫外光谱分析结果表明，SD刚性链已在PA6基体中生成；DSC和TGA热分析结果表明，SD的加人，对PA6的结晶有诱导作用，但没有改变铸型尼龙的α晶型结构；SD(5％)／PA6的动态力学谱图上，只出现一个玻璃化转变温度，较PA6提高了9℃。     

PA6／CNT复合材料的动态机械性能和增强机理分析

采用三种处理方法得到了不同表面性质的碳纳米管，与尼龙6共混制备了PA6／CNTs复合材料。考察了复合材料的动态机械性能。研究发现，碳纳米管的加入提高了尼龙6的储能模量和损耗模量，碳纳米管表面的性质决定了对复合材料动态机械性能的改变程度。经过高温高压剧烈反应的CNTs3#会断裂为尺寸较小的碳管，小尺寸碳管的成核作用使得复合材料结晶度提高，以及CNTs3#表面接枝的一NH2和未反应的-COOH，会造成尼龙6大分子链段的交错缠绕，因而PA6／CNTs3#的储能模量和损耗模量最大。混酸和加热搅拌条件下氧化CNTs1#含有比单纯浓硝酸氧化的CNTs2#更多的-COOH，所以PA6／CNTs 1#的储存模量和损耗模量大于PA6／CNTs2#。     

碳纤维增强尼龙复合材料的摩擦性能研究

根据碱催化阴离子聚合原理 ,制备了连续长碳纤维增强单体浇铸尼龙复合材料 (简称CL/PA)。在MM -2 0 0型磨损试验机上考察了碳纤维含量和试验条件对其摩擦性能的影响 ,并利用扫描电子显微镜对其摩擦性能和磨损机制进行了考察。分析结果表明 :碳纤维的体积分数在 35 %左右时增强效果最好 ,CL/PA复合材料的摩擦系数和磨损率随着载荷的增加而减小。其磨损机制主要表现为粘着磨损和碳纤维的破碎和磨平的特征     

碳纤维增强尼龙复合材料的摩察性能研究

根据碱催化阴离子聚合原理，制备了连续长碳纤维增强单体浇铸尼龙复合材料（简称CL/PA）。在MM-200型磨损试验机上考察了碳纤维含量和试验条件对其摩擦性能的影响，并利用扫描电子显微镜对其摩擦性能和磨损机制进行了考察。分析结果表明：碳纤维的体积分数在35%左右时增强效果最好，CL/PA复合材料的摩擦系数和磨损率随着载荷的增加而减小。其磨损机制主要表现为粘着磨损和碳纤维的破碎和磨平的特征。     

PA6超细纤维/多孔PU复合材料结构与性能研究

以聚氨酯(PU)为基体,尼龙6(PA6)为增强材料,用浸渍及甲苯萃取法制备了PA6超细纤维增强的多孔PU复合材料。SEM照片显示PA6超细纤维直径和PU泡孔直径为1～3μm,尺寸均匀。力学测试表明复合材料的强度主要由PA6超细纤维提供,柔软度测试表明复合材料的柔软度主要由PU的模量决定。     

三维编织芳纶纤维增强尼龙复合材料性能研究术

研究了纤维体积比对三维编织芳纶纤维增强尼龙(简称K3D／PA)复合材料力学性能的影响。同时，研究了γ射线辐照处理对K3D／PA的影响。研究发现，随着芳纶纤维体积比的增大，K3D／PA的力学性能提高；芳纶纤维经γ射线辐照处理后，表面含氧量有所提高，并出现新的官能团。纤维经表面处理后，K3D／PA的弯曲强度、弯曲弹性模量及剪切强度均比未处理的高，但冲击强度较低。     

三维编织碳纤维尼龙复合材料的探索性研究

本文论述了根据碱催化阴离子聚合原理、用液态原位聚合方法制备三维编织碳纤维尼龙复合材料的成型工艺过程,测试并分析了其力学性能及其成型过程中的主要影响因素.结果表明,该复合材料的性能明显优于长碳纤维尼龙复合材料.     

PA6/CF/EG导电复合材料的制备与性能

采用熔融共混法制备了不同碳纤维/热膨胀石墨(CF/EG)比例的尼龙6/碳纤维/热膨胀石墨(PA6/CF/EG)导电复合材料并研究其性能。结果表明,CF的加入能显著提高复合材料的力学性能;而随着EG含量的提高,复合材料的导电性能和导热性能显著提高,但力学性能在一定程度上得到降低。当CF质量分数为20%时,复合材料具有最优的力学性能,当EG质量分数为20%时,复合材料体积电导率可显著提高至0.262 S/m,热导率可达1.3379W/(m·K)。     

EFFECT OF FIBER REINFORCEMENT ON THERMAL STABILITY AND SWELLING BEHAVIOR OF CR/NBR BLENDS

The effect of type, length, and denier of fibers on the thermal stability and swelling behavior of chloroprene/butadiene–acrylonitrile rubbers (CR/NBR) composites was investigated. The results reveal that Nylon 6 fibers improved mechanical properties, thermal stability, and swelling resistance in toluene of 50/50 CR/NBR blends. Of all fiber types investigated, the viscose fiber CR/NBR composite has the best swelling resistance in motor oil, whereas the polyester (PET) fiber composite has the best swelling resistance in brake fluid. The effect of Nylon 6 fiber loading up to 30 phr was tested in terms of mechanical properties of the composites and swelling in toluene and oils. Also, the reinforcement of white-filled blends were examined. Nylon 6 fiber loadings (15–30 phr) showed promising results, and the white-filled Nylon 6 composites showed a significant reinforcement with regard to mechanical properties and thermal stability.     

PP-g-MAH对尼龙6/炭黑复合材料性能和形貌的影响

以炭黑(CB)为导电填料,马来酸酐接枝聚丙烯(PP-g-MAH)为增韧剂,通过双螺杆挤出机和注射成型机制备了尼龙(PA)6/PP-g-MAH/CB复合材料,研究了PP-g-MAH含量对7.5%CB填充PA6力学性能、抗静电性能、热稳定性能和形貌的影响。结果表明,添加质量分数20%的PP-g-MAH可提高PA6/CB复合材料的拉伸强度、韧性、抗静电性能和热稳定性。PA6/PP-g-MAH/CB复合材料力学强度和热稳定性的提高源于PP-g-MAH产生的能量耗散以及CB,PP-g-MAH与PA6之间较好的界面粘附和PP-g-MAH均匀细化分散在PA6/CB中。PP-g-MAH改变了CB在共混物中的选择性分布,使PA6/CB的表面电阻率和体积电阻率分别下降5个和3个数量级。     

Development of a transparent PMMA composite reinforced with nanofibers

Core‐shell composite nanofibers with PA‐6 (Nylon‐6) as core and Poly (methyl methacrylate) (PMMA) as shell were fabricated by a coaxial electrospinning method, which were later made into nanofiber reinforced transparent composites through a hot press treatment. Morphological and structural characterizations for the composite nanofibers and the transparent composites were realized in terms of SEM, TEM, and FTIR techniques. The fiber reinforcement feature of the PA‐6 was demonstrated by the SEM photos of a composite sample fractured in liquid nitrogen. Through TGA and DSC tests, it was observed that thermal endurance and glass‐transition temperature of the nanofiber reinforced composites altered in variation with the contents of the reinforcing PA‐6. Experimental results indicated that the mechanical performance of the nanofiber reinforced transparent composites was obviously improved, and its transparency decreased a little with an increase in the PA‐6 content. As long as, however, a sacrifice of 10% in transparency was specified, an increment of more than 20% in the mechanical properties of the composites was achievable. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

Microstructure and fracture behavior of (co)injection‐molded polyamide 6 composites with short glass/carbon fiber hybrid reinforcement

The mechanical and fracture properties of injection molded short glass fiber)/short carbon fiber reinforced polyamide 6 (PA 6) hybrid composites were studied. The short fiber composites of PA 6 glass fiber, carbon fiber, and the hybrid blend were injection molded using a conventional machine whereas the two types of sandwich skin–core hybrids were coinjection molded. The fiber volume fraction for all formulations was fixed at 0.07. The overall composite density, volume, and weight fraction for each formulation was calculated after composite pyrolysis in a furnace at 600°C under nitrogen atmosphere. The tensile, flexural, and single‐edge notch‐bending tests were performed on all formulations. Microstructural characterizations involved the determination of thermal properties, skin–core thickness, and fiber length distributions. The carbon fiber/PA 6 (CF/PA 6) formulation exhibits the highest values for most tests. The sandwich skin‐core hybrid composites exhibit values lower than the CF/PA 6 and hybrid composite blends for the mechanical and fracture tests. The behaviors of all composite formulations are explained in terms of mechanical and fracture properties and its proportion to the composite strength, fiber orientation, interfacial bonding between fibers and matrix, nucleating ability of carbon fibers, and the effects of the skin and core structures. Failure mechanisms of both the matrix and the composites, assessed by fractographic studies in a scanning electron microscope, are discussed. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 957–967, 2005     

长玻纤填充尼龙6复合材料研究

采用熔体浸渍工艺制备长玻纤增强PA6复合材料。研究了玻纤种类、玻纤含量长度、界面改性等对复合材料力学性能及电性能的影响。试验结果表明：在玻纤含量35％时，切粒长度7mm，粒径3．5mm时，复合材料表现出优异的力学性能和电性能。     

Preparation and properties of novel epoxy composites containing electrospun PA6/F‐MWNTs fibers

The Nylon 6 (PA6)/the functionalized multiwalled carbon nanotubes (F‐MWNTs) fibrous membranes were fabricated by electrospinning, and then incorporated into an epoxy matrix. Their morphology, thermal stability, mechanical properties, thermal conductivities, and electrical resistivity were investigated. The electrospun PA6/F‐MWNTs fibers performed as a skeleton in the epoxy matrix, and the well interfacial adhesion between the epoxy matrix and the PA6/F‐MWNTs fibers leads to high mechanical properties of composites. The PA6 serves as an intermediate layer and alleviates the modulus mismatch between the stiff MWNTs and the soft epoxy matrix. The thermal conductivities of the epoxy composites increase by 27.3, 35.0, and 36.1%, respectively, with 0.5, 1 and 1.5 wt% F‐MWNTs loading in the PA6/F‐MWNTs fibers. At the same time, the PA6 simultaneously retains the high electrical resistivity of these epoxy composites. POLYM. ENG. SCI., 56:1259–1266, 2016. © 2016 Society of Plastics Engineers     

玄武岩纤维增强尼龙66复合材料的制备与性能研究

采用熔融挤出法制备了尼龙66/玄武岩纤维复合材料,通过力学性能测试、扫描电子显微镜观察及固体流变仪分析等方法研究了偶联荆种类及含量、玄武岩纤维含量对复合材料力学性能、加工性能和动态力学性能的影响.结果表明,偶联剂KH550对改善复合材料的力学性能效果最佳,且随偶联剂KH550含量的增加,复合材料的力学性能先增大后降低;在实验范围内,随着玄武岩纤维含量的增加,复合材料的力学性能显著提高,熔体流动速率降低.