Papers by Keyword: Polyamide

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Authors: Yong Li Peng, Yi Liang, Chi Huang, Zui Han Wang
Abstract: Two novel low viscosity polyamide curing agents are prepared, the viscosity of the polyamide-1 synthesized from adipic acid and tetraethylene pentamine is 12240mPa·s and that of the polyamide-2 synthesized from dimenthy tetrphthalate and tetraethylene pentamine is 11800mPa·s. The effect of synthetic polyamide content on the mechanical performance and thermal performance of the epoxy curing system is studied. The results show that overall performance of the curing system first increases and then decreases with the increase of synthetic polyamide content and reaches maximum with 33 wt% of polyamide. The tensile strength, flexural strength and impact strength of polyamide-1/CYD-128 are 32.41MPa, 81.55MPa and 19.6KJ/m2, respectively. While that of polyamide-2/CYD-128 are 37.88MPa, 104.60MPa and 16.5KJ/m2, respectively. This low viscosity curing system can be used as building adhesives due to its excellent mechanical properties.
Authors: Yun Yun Xu, Tao Zhang, Zhen Rong Lin, Shan Dan Zhou, Xin Xu
Abstract: Carbon fibers combine low weight and exceptional mechanical properties,making them ideal reinforcements forpolymer composite materials. An attempt has been made to review and analyze the development and problems made during last few decades in the field of carbon fiber reinforced polyamide composites. The recent advance of research, structure and property, the advanced techniques were summarized in this paper. In accordance with the hot spots of the research, the interface behavior, reinforcement and toughening of this type of material were expounded specially. Finally, the prospect and development of this composite were analyzed.
Authors: Ľudmila Dulebová, František Greškovič, Janusz W. Sikora, Volodymyr Krasinskyi
Abstract: The paper deals with the influence of environmental degradation on the change of the mechanical properties of polymer nanocomposites. The tested material was polyamide (PA) filled with nanoclay fillers Cloisite 30B, Cloisite 93A and Cloisite Na + in a volume of 2, 4 and 6 wt%. Test samples were produced by injection molding and were subjected to 540 hours and 1080 hours of UV radiation. The change of mechanical properties of PA6/MMT nanocomposite systems after the ageing in the UV chamber was studied by tensile test and Charpy impact resistance test. Article also compares structure of PA6/MMT nanocomposite.
Authors: Yu Jiang Fan, Guo Ping Chen, M. Tanaka, Tetsuya Tateishi
Abstract: Polyamides containing amino acid residues were synthesized through a chemoenzymatic route. At first, monomers containing amino acid esters at both ends were prepared from amino acid esters and bifunctional acid chlorides through a Scotten-Baumann reaction under organic condition. Diamine was used as bifunctional nucleophilic reagent to aminolysis the amino acid ester bonds of these monomers under protease catalysts, leading to the polycondensation to form the desired polyamides containing amino acid residues. Spectra characterizations confirmed the structure of obtained polyamides. The factors that influence the polymerization, including the type of enzymes, the amount of enzymes, and the water contents in the solvent, were also discussed. It is expected that the obtained polyamides have the potential for biomaterial applications.
Authors: H. Inada, Chikara Ohtsuki, Toshiki Miyazaki, Shinichi Ogata, Masao Tanihara
Authors: Pieter Samyn, Patrick de Baets
Abstract: Although tribological tests on polymers are traditionally performed on small-scale pin-on-disc or bloc-on-ring configurations, present sliding tests under high load provide more accurate de-sign data. For wear tests on large samples edge effects, stress concentrations and the moveability of wear debris into the contact zone are simulated close to practice. It is illustrated that friction is gene-rally lower compared to small-scale tests, while overload and deformation occur more frequently.
Authors: Michel Rapeaux
Abstract: The dielectric strength of halogen-free glass-reinforced polyamides, including PA6, PA66, PA66/6T and PPA has been evaluated in severe conditions i.e. 120°C and 140°C according to IEC60243-1. A few halogenated grades have been evaluated as well for comparison purposes. The influence of the type of flame retardant is discussed, and results in terms of dielectric strength retention at high temperature are compared with electrical Relative Thermal Index RTI and the compound melting temperature.
Authors: Y. Şahin, Patrick de Baets
Abstract: Dry sliding wear behaviours of polyamides of were investigated by Taguchi method using a pin-on-flat plate configuration. L9 orthogonal array and analysis of variance (ANOVA) were applied to investigate the influence of process parameters on wear rate. The experimental results indicated that Signal-to-Noise ratio (SNR) decreased with increasing elongation and decreased with increasing load slightly, but increased with increasing speed. ANOVA revealed that elongation at break exerted a great effect on the wear rate, which was followed by speed, respectively. Optimal process parameter was obtained for LFX type of polymer against smooth hardened steel.
Authors: Qiu Yuan Xiong
Abstract: The absorbed liquids in the substrate material may have a potential influence on atmospheric pressure plasma treatment. In order to investigate how the influence of ethanol pretreatment affects atmospheric pressure plasma treatment, nylon 6 films were treated by helium/oxygen plasma using atmospheric pressure plasma jet (APPJ). Water contact angle of the ethanol pretreated samples was close to that of the control. Scanning electron microscopy (SEM) showed that the ethanol pretreated sample surface had a little change on the surface. X-ray photoelectron spectroscopy (XPS) showed that the carbon component decreased and the oxygen component increased after plasma treatment. With the ethanol pretreatment, the T-peel strength values for the samples were similar to that of the control.
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