PPS/PA6合金的研究

为了改善聚苯硫醚(PPS)的性能,降低应用成本,制备了一系列不同组成的PPS／尼龙6(PA6)合金,通过热失重分析,拉伸性能、冲击性能测试及扫描电子显微镜观察等研究了合金的热行为、力学性能及微观形态：结果表明,PPS／PA6合金具有良好的耐热性能,PPS和PA6有较好的相容性,PA6的加入可以改善PPS的力学性能。     

聚芳醚腈/聚苯硫醚合金的制备及性能研究

将聚芳醚腈(PEN)与商用聚苯硫醚(PPS)按不同比例通过熔融共混制备系列合金材料。研究结果显示PEN与PPS有较好的相容性,共混合金的力学性能处于纯聚合物力学性能区间。通过流变研究表明PPS与PEN的共混物在剪切条件下,黏度较纯PEN树脂有明显降低,有效改善了后者的加工性能,合金的耐热性能较PPS树脂有大幅提高。     

聚苯硫醚合金及其应用

阐述了聚苯硫醚性能特点和存在的缺陷,指出了改性方法和合金形成的条件,并详细介绍了主要PPS合金的品种、特性和应用。     

PPS/PAI/CF复合材料摩擦磨损性能的研究

采用模压成型法制备了聚苯硫醚(PPS)/聚酰胺酰亚胺(PAI)合金及其碳纤维(CF)改性复合材料。测试分析了该复合材料的力学性能,并通过扫描电镜(SEM)对其摩擦磨损表面形貌进行了观察,探讨了复合材料的摩擦磨损性能;考察了PPS/PAI合金的最优配比及CF含量对PPS/PAI/CF复合材料性能的影响。结果表明:PAI的加入改善了PPS的力学性能,当PPS/PAI质量比为40/60时,PPS/PAI合金的力学性能最优;另外,CF的加入使PPS/PAI/CF填充复合材料的摩擦系数和磨损量大幅度下降,其中,当CF含量为30%时,PPS/PAI/CF填充复合材料的摩擦系数和磨损量较未填充PPS/PAI分别下降了66%和90%。     

稀土纳米母粒改性聚苯硫醚复合材料的研究

采用稀土表面改性剂对纳米碳酸钙进行表面改性并表征;考察了稀土纳米母粒含量对聚苯硫醚加工性能和力学性能的影响。研究了聚苯硫醚/纳米母粒/玻纤(GF)复合材料的力学性能、电性能及微观结构。结果表明:经稀土表面改性剂处理制备的稀土纳米母粒加入量及复合材料制备工艺对复合材料的加工性能和力学性能有较大的影响;随着稀土纳米母粒含量的增加,复合材料的力学性能呈先增加后降低的趋势,其电绝缘性能也得到一定程度的提高。     

电子束辐射对聚苯硫醚结构和性能的影响

研究了在室温下空气环境中电子束辐射聚苯硫醚过程中,不同辐射剂量对聚苯硫醚的表面化学结构、热性能和力学性能的影响。结果表明,在电子束辐射下,聚苯硫醚表面发生氧化,且氧含量随着辐射剂量的增大而升高。由于辐射所致结构变化,聚苯硫醚制件表面部分的结晶温度和熔点随着辐射剂量的增大呈现先升高后降低的趋势。然而,聚苯硫醚样品内部的元素组成、热性能和力学性能几乎不受辐射剂量的影响。     

聚苯硫醚对聚芳醚腈的增塑、增韧作用与性能研究

选用聚苯硫醚(PPS)作为聚芳醚腈(PEN)的增塑剂,通过熔融共混的方法制备了PEN/PPS合金,并研究了PPS对PEN的增塑、增韧作用及性能的影响.结果表明,PPS对PEN具有很好的增塑和增韧效果,当PPS质量分数为15%时,大幅提高了PEN的加工流动性和韧性;PEN/PPS合金的其它力学性能和耐热性能与PEN相当.     

聚砜／聚苯硫醚共混物性能研究

研究了聚砜／聚苯硫醚共混物流变性能、力学性能及形态。结果表明，共混物的表观粘度与聚砜相比大幅度降低，弯曲强度较聚砜、聚苯硫醚均有提高，其它力学性能介于两者之间，共混物的分散相聚苯硫醚在聚砜中分散较为均匀。     

聚苯硫醚废料再利用技术初探

选用在纺丝生产中产生的聚苯硫醚(PPS)废料与未经使用的聚苯硫醚树脂进行流变性能、热性能与加工性能的对比分析,探究聚苯硫醚废料二次利用的可能性。将聚苯硫醚废料进行熔融纺丝,对熔纺纤维进行力学性能与耐腐蚀性能进行测试。实验结果表明:聚苯硫醚废料具有良好的热性能,干燥后未使用的聚苯硫醚废料具有良好的纺丝加工性能,熔纺过程中产生的聚苯硫醚废料熔纺纤维不具备单独使用价值。     

EMG增容制备PPS/PA66合金的研究

采用乙烯-马来酸酐-甲基丙烯酸缩水甘油酯三元共聚物(EMG)作为增容剂,制备了聚苯硫醚(PPS)/尼龙66(PA66)合金.并对该合金的力学性能、微观结构形态进行了研究.结果表明:EMG对PPS/PA66体系有很好的增容作用,能改善PPS/PA66合金的力学性能,并且增容后,PPS/PA66的界面结合明显增强;EMG的含量越多,增容效果越显著.     

Mechanical and tribological properties of PA66/PPS blend. II. Filled with PTFE

The mechanical and tribological properties of 70 vol % PA66/30 vol % PPS blend filled with different content of polytetrafluoroethylene (PTFE) were studied in this paper. It was found that the addition of PTFE impairs the mechanical properties of PA66/PPS blend, but greatly increases the wear resistance and decreases the friction coefficient. When PTFE content exceeds 20 vol %, the friction coefficient of composite is minimum (0.15) and lower than that of pure PTFE under the same conditions (0.22). The lowest wear volume (0.44 mm³) is obtained with PA66/PPS/30 vol % PTFE composite, which decreased by 91% compared with unfilled PA66/PPS blend (4.99 mm³). The topography of transfer film and the elemental distribution were investigated by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS), respectively. Because of the characteristic crystalline structure, PTFE preferentially transferred to the steel ring surface and formed a thin, uniform and firmly adhered transfer layer, which reduced the ability of PA66/PPS blend to transfer and prevent the adhesion between the sample and the couterface. In addition, the superior lubrication of PTFE inhibited the frictional heat melting during sliding. All these aspects are close related to the friction and wear behavior of PA66/PPS/PTFE composite. Upon the addition of PTFE, thermal control of friction regime is not applicable to the PA66/PPS blend. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 969–977, 2006     

Compatibilization of PVDF/PA6 Blend by the Addition of a Third Polymer PTFE

The compatibilization of poly(vinylidene fluoride) (PVDF) with polyamide 6(PA6, higher acrylonitrile content) blend was improved by adding poly(methyl methacrylate) (PTFE). It was confirmed by characterizing the mechanical and tribological properties of the blends. More homogeneous morphology was formed when PTFE was added into PVDF/PA6 blend, which was shown in scanning electron microscopy (SEM). The surface tension of blends was increased due to the higher polar surface tension of PTFE. As the content of PTFE was increased further, the tensile strength of the blend was slightly decreased.     

耐磨增韧改性聚甲醛的制备及性能研究

用双螺杆共混挤出法制备了不同比例的聚四氟乙烯(PTFE)纤维改性聚甲醛(POM),考察了PTFE纤维含量对POM摩擦磨损性能、力学性能和热稳定性的影响。在POM/PTFE耐磨体系中,创新性地引入聚氧化乙烯(PEO)作为相容剂,制备出耐磨性能和韧性俱佳的POM改性材料。对POM改性材料进行了耐磨性和力学性能分析,利用偏光显微镜进一步证实了PEO能促进PTFE纤维和POM的相容性。结果表明,随着PTFE纤维含量的增加,POM的摩擦磨损性能有所提高,但力学性能不理想。在8%PTFE+92%POM体系中引入PEO,改性材料的摩擦因数低至0.169,缺口冲击强度比POM提高了173%,得到了耐磨和增韧效果显著的POM改性材料。     

Tribological behaviors of carbon series additions reinforced CF/PTFE composites at high speed

The tribological, mechanical, and thermal properties of carbon series additions reinforced CF/PTFE composites at high speed were investigated. In this work, carbon fiber (CF) filled polytetrafluoroethylene (PTFE) composites, which have excellent tribological properties under normal sliding speed (1.4 m/s), were filled with some carbon materials [graphene (GE), carbon nanotubes (CNTs) and graphite (Gr)] respectively to investigate the tribological properties of CF/PTFE composites at high sliding speed (2.1 and 2.5 m/s). The results reveal that the carbon series additions can improve the friction and anti‐wear performances of CF/PTFE, and GE is the most effective filler. The wear rate of 0.8 wt % GE/CF/PTFE was decreased by 50 ? 55%, 55 ? 60%, 40 ? 45% at 1.4, 2.1, and 2.5 m/s compared with CF/PTFE. SEM study shows GE could be helpful to form smooth and continuous transfer film on the surface of counterparts. Meanwhile, GE can improve its tensile strength and elastic modulus obviously. Thin layer structure of GE could enhance the thermal conductivity, which can be helpful to dissipate heat of CF/PTFE composites wear surface. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43236.     

聚四氟乙烯填充聚醚醚酮及其复合材料的研究

利用熔融共混工艺制备了ＰＥＥＫ／ＰＴＦＥ共混物及其复合材料,研究了ＰＴＦＥ对ＰＥＥＫ共混物及其复合材料力学性能和耐磨性的影响,结果表明,ＰＥＥＫ经１０％￣ＰＴＦＥ填充改性,玻纤／碳纤混杂增强后,由于磨损方式的改变,使该复合材料不仅保持了良好的物理力学性能,而且具有较低的摩擦系数,耐磨性也得到明显改善。     

PP/UHMWPE及含有不同添加剂共混物的研究

采用超高分子质量聚乙烯对聚丙烯进行改性,同时采用了3种不同的添加剂PP-MAH、LLDPE、SBS,希望能进一步提高改性效果。通过两次熔融混合制备PP/UHMWPE及含有不同添加剂的共混物,对其力学性能进行测试及表征。实验结果表明,UHMWPE在基体中形成物理交联的网络结构,可在冲击作用下吸收、传递大量的冲击能,从而有...     

无机材料填充改性PTFE复合材料研究进展

综述了聚四氟乙烯（PTFE）无机材料填充改性中纤维填充改性,颗粒填充改性以及复合填充改性三大类的改性研究进展。介绍了不同无机填料对于PTFE复合材料的力学性能以及摩擦学性能的影响,包括摩擦因数、拉伸强度以及材料硬度等,发现铜（Cu）粉、二硫化钼（MoS2）以及玻璃纤维（GF）等无机填料成本较低且对PTFE的力学性能以及摩擦学性能改善较为明显,更能满足实际工程应用。最后,分析了国内外近年来研究中所存在的问题,并提出了解决方向。     

The Effect of Carbon Fiber Content on the Mechanical and Tribological Properties of Carbon Fiber-Reinforced PTFE Composites

Blending polytetrafluorothylene (PTFE) to carbon fiber at different compositions was produced in a corotating twin screw extruder where PTFE acts as the polymer matrix and carbon fiber as the dispersed phase. The effects of carbon fiber content on mechanical and tribological properties of the composites were investigated. The worn surface morphologies of neat PTFE and its composites were examined by scanning electron microscopy (SEM) and the wear mechanisms were discussed. The presence of carbon fiber dispersed in the PTFE continuous phase exhibited superior tribological characteristics to unfilled PTFE. The optimum wear reduction was obtained when the content of carbon fiber is 30 vol%.     

Properties of potassium titanate whisker reinforced polytetrafluoroethylene-based friction materials of ultrasonic motors

Ultrasonic motors (USMs) are driven by friction forces between a stator and rotor. So the output properties and life of USMs are strongly related to the properties, such as the mechanical and tribological properties, of the frictional materials. In this study, the effects of the content of potassium titanate whiskers (PTWs) on the mechanical and tribological properties of polytetrafluoroethylene (PTFE)-based friction materials and the performances of the corresponding USMs were studied. The morphology of worn surfaces of PTFE composites were observed with a scanning electron microscope. The experimental results show that the PTWs not only increased the hardness and elastic modulus of the PTFE composites but also increased the friction coefficient and wear resistance of the PTFE composites. On the whole, the PTFE-based friction materials filled with 5 wt % PTWs were the preferable friction materials for USMs. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

In situ filling of SiO2 nanospheres into PTFE by sol–gel as a highly wear-resistant nanocomposite

In situ filling of nanomaterials into polymers facilitates the dispersion of the nanofillers and their interface combination with the matrices, and reduces the agglomeration encountered in the nanocomposites prepared by a mechanical mixing method. Polytetrafluoroethylene (PTFE) nanocomposites filled with SiO₂ nanospheres (SNS) were fabricated by an in situ sol–gel method in this paper. The SNS in situ filled was highly dispersed in PTFE and showed an excellent combination with the matrix, and the fabricated SNS/PTFE nanocomposites were found a pronounced improvement in stiffness, hardness, glass transition temperature, and hydrophobicity in comparison with the pristine PTFE and the ones prepared by mechanical mixing with the same content. Furthermore, significantly reduced coefficients of friction and volume wear rates were observed on the SNS/PTFE nanocomposites prepared by in situ sol–gel. An operating temperature high up to 200°C and very low volume wear rate were accessible on the optimized SNS/PTFE nanocomposite by in situ filling. The methodology, in situ filling of nanofillers into matrices, might pave a way to prepare nanocomposites with excellent mechanical, thermal, and tribological properties.