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本文主要从大豆蛋白质塑料的加工工艺角度考虑,通过添加大豆油、硬脂酸、十二烷基硫酸钠、壳聚糖、淀粉、聚乙烯醇,研究其对大豆蛋白质塑料挤出加工和力学性能的影响。 相似文献
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以羧甲基纤维素(CMC)为黏结剂,通过挤出成型的方式制备氮化硅陶瓷管材,并研究了黏结剂含量对陶瓷管材生坯性能的影响,烧结温度对氮化硅陶瓷相对密度、弯曲强度和微观形貌的影响,以及氮化硅陶瓷的高温强度性能。结果表明:黏结剂含量为7%(质量分数)时,可制得干燥收缩均匀、表面光滑、无微裂纹的陶瓷管材生坯;烧结温度在1 740℃时,氮化硅陶瓷的相对密度和弯曲强度达到最大值,分别为96%和(684±23) MPa,其1 200℃时的弯曲强度达(380±21) MPa,具有良好的高温强度性能。 相似文献
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在研究聚四氟乙烯纤维加工参数与性能关系的基础上,通过对工艺开发与设备研制相结合,确定生产聚四氟乙烯长纤维和短纤维最佳生产工艺。研究表明,膜裂法工艺生产的聚四氟乙烯纤维的细度、均匀性、力学性能和热收缩率等性能均有大幅度的提高。 相似文献
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《高科技纤维与应用》2012,37(2):63-63
本发明提供一种聚四氟乙烯纤维滤料及其制备方法,它具有极强的高温化学稳定性、过滤精度高、耐磨损、使用寿命长、应用范围广等优点,尤其适用于工况环境恶劣的过滤需要。本发明的聚四氟乙烯纤维滤料是使用聚四氟乙烯纤维滤布经过浸渍处理,再进行覆膜或涂层处理;所述浸渍处理采用聚四氟乙烯溶液进行浸渍;所述聚四氟乙烯溶液包括:聚四氟乙烯和质量分数30%-40%;聚苯酯的质量分数20%-30%;粘合剂的质量分数1%-3%;水,余量。 相似文献
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毕鸿章 《高科技纤维与应用》2005,30(2):49
日本东丽公司在法国的合资企业索菲卡(Soficar)公司,是生产热塑性树脂混杂碳纤维纱制品市场中的新的一员。该公司采用廉价的共挤出工艺过程的线状粒取代热塑性树脂粉末,生产的产品有窄带和织物;所用的纤维是东丽公司的碳纤维T700;基体树脂采用PA11和PA12。表2中列出含有T700碳纤维的Soficar带子的力学性能。 相似文献
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以过氧化二异丙苯(DCP)为引发剂,通过反应性挤出的方法将相变材料丙烯酸聚乙二醇酯(PE-GA)接枝到聚丙烯(PP)基体上,利用熔融纺丝的方法制备PP-g-PEGA调温纤维。通过红外光谱法和溶剂萃取法表征了PEGA在PP上的接枝情况;通过差示扫描量热仪、纤维强力仪和扫描电镜分别表征了PP-g-PE-GA调温纤维的储热性能、力学性能和外观形态。结果表明:PEGA与PP发生了化学接枝,PP-g-PEGA纤维的接枝率达3.2%;当PEGA的质量分数为8.0%,引发剂DCP质量分数为0.6%时,相变焓达6.93 J/g;PP-g-PEGA调温纤维的断裂强度随着PEGA含量的增加呈先增大后减小的趋势;PP与PEGA相容性良好,纤维的外观光滑均匀。 相似文献
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George A. Schmidt II Yu-Jyun Lin Yiyang Xu Dongfang Wang Galip Yilmaz Lih-Sheng Turng 《Polymer Engineering and Science》2021,61(4):1050-1065
Polytetrafluoroethylene (PTFE) and expanded PTFE (ePTFE) are ideal for various applications. Because PTFE does not flow, even when heated above its melting point, PTFE components are fabricated using a process called paste extrusion. This process entails blending PTFE powder particles with a lubricant to form PTFE paste, which is subsequently preformed, extruded, expanded (in the case of ePTFE), and sintered. In this study, ethanol was proposed as an alternative green lubricant for PTFE processing. Not only is ethanol benign and biofriendly, it provides excellent wettability and processing benefits. Using ethanol as a lubricant, the shear viscosity of PTFE paste and its flow behavior during paste extrusion were investigated. Frequency sweeps using a parallel-plate rheometer were performed on PTFE paste samples and various grits of sandpaper were used to reduce wall slip of PTFE paste. A viscosity model was generated and a multiphysics software was used to simulate PTFE paste extrusion. The simulated extrusion pressure was compared to experimental data of actual paste extrusion. Flow visualization experiments using colored PTFE layers were conducted to reveal the flow profile of the PTFE paste. The morphology of the expanded ePTFE tubes was examined using scanning electron microscopy and the effect of expansion ratio on ePTFE morphology was quantified. 相似文献
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Preparation and properties of porous polytetrafluoroethylene hollow fiber membrane through mechanical operations
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Porous polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared from fine powder through a series of mechanical operations including paste extrusion, heat treatment, stretching and sintering. In contrast to conventional process, the heat treatment used in this study was performed at 200°C to 330°C (near the melting point) on the PTFE nascent hollow fiber (precursor of membrane). The results showed that the introduction of heat treatment step effectively improved the mechanical properties of precursors, the ultimate stress and strain increased observably with heat treatment temperature, which was beneficial to subsequently stretching precursors to make them porous. Furthermore, the morphological changes and improvement of membrane properties caused by stretching operation were investigated for porous PTFE hollow fiber membrane having finer pore size and higher porosity. The porous microstructure of nodes interconnected by fibrils varied depending on the stretching conditions, such as the stretching temperature, rate, and ratio. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42696. 相似文献
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Wei Chen Zhonglue Hu Xiping Li Jiawen He Sisi Wang Yuan Zhao Mengjia Li Jiazhen Zhang 《Polymer Composites》2024,45(1):668-679
The additive manufacturing of continuous fiber reinforced thermoplastics (CFRTPs) paves way for the high-strength, light-weight components for variety of load-bearing applications. In this work, the continuous carbon fiber reinforced PA6 (CCF-PA6) composites was successfully printed from the prepreg filament. The prepreg filament was prepared in-house by impregnating the heat-and-acid treated 1 K carbon fiber bundle with the molten PA6. The tensile strength of the prepreg filament, which contained with 40 vol% CF, reached 984 MPa. The unidirectional CCF-PA6 specimens were subsequently 3D-printed with the prepreg filament, and the mechanical strength of those 3D-printed specimens were tunable by adjusting a set of printing parameters, such as layer thickness, hatch spacing and printing temperatures. The highest tensile strength of the specimen reached 555 MPa. Those specimens also exhibited outstanding mechanical strength at elevated temperatures, still reaching 184 MPa at 150°C. The mechanical strength of those specimens was dependent on the content of the fiber. This study can hopefully provide new insights for feedstock design and spur novel ideas in tailoring the mechanical properties of the 3D-printed CFRTPs. 相似文献
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An unique two‐step technique to fabricate densified continuous fiber reinforced polytetrafluoroethylene (PTFE) composites with significantly improved interfacial bonding and mechanical properties have been successfully developed. The technique is conventional sintering followed by resin film infusion (RFI). The mechanical properties of the composites were studied, and results show that the composites have significantly improved interfacial bonding and mechanical properties. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3588–3591, 2007 相似文献
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Amir Ghazanfari Wenbin Li Ming Leu Jeremy Watts Gregory Hilmas 《International Journal of Applied Ceramic Technology》2017,14(3):486-494
Ceramic On‐Demand Extrusion (CODE) is an additive manufacturing process recently developed to produce dense three‐dimensional ceramic components. In this paper, the properties of parts produced using this freeform extrusion fabrication process are described. High solids loading (~60 vol%) alumina paste was prepared to fabricate parts and standard test methods were employed to examine their properties including the density, strength, Young's modulus, Weibull modulus, toughness, and hardness. Microstructural evaluation was also performed to measure the grain size and critical flaw size. The results indicate that the properties of parts surpass most other ceramic additive manufacturing processes and match conventional fabrication techniques. 相似文献