Papers by Keyword: PPS

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Authors: Celine Gros, Julie Tarrieu, Valérie Nassiet, Emmanuel Dutarde
Abstract: Because of its special properties and commercial significance, Poly(phenylene sulfide) (PPS) has been the subject of many research efforts since its commercial introduction in 1967. Intensive work has been done on its crystalline structure and morphology and its thermal behaviour. But fewer investigations have been carried out to understand long term behaviour in high temperature environments. Always anticipating industrial needs linked to power integration, we have launched an extensive study on thermal aging in air of PPS at 250°C. This study has shown that PPS thermal degradation in air happens by intermolecular branching reaction, similar to crosslinking. This phenomenon was already known for temperature above 300°C. This crosslinking is evidenced by rheometry where the relative position of G’ and G’’ above melting temperature changes with aging. IR spectroscopy confirms that para substituted benzene in PPS molecule is transformed in 1,2,4 trisubstituted benzene. DSC measurements evidence both an elevation of melting temperature and a change in melting endotherm showing significant changes in crystalline morphology along aging, which tends to indicate that crosslinking occurs in crystalline phase. Then degradation implies drastic loss of mechanical properties leading to destruction of the sample.
Authors: Li Guo, Huan Qin Zhu, Yuan Bao Sun
Abstract: The tribological properties of polyphenylene sulfide (PPS) composites reinforced with carbon nanotube (CNT) and carbon nanofiber (CNF) were studied. Sliding tests in a pin-on-disk configuration were used to study the tribological properties. The wear rate of reinforced composites in the early part of sliding was lower than that of PPS but over extended sliding the reinforcement was not effective in reducing the wear rate. The coefficient of friction was not greatly affected by the presence of CNF and CNT. The lack of transition from run-in to steady state wear was attributed to the increased wear rates of PPS composites.
Authors: Emil Spišák, Branislav Duleba, Ivan Gajdoš
Abstract: This study presents measurement and calculations of crystallization of PPS composite with 40 % of glass fibers on real molded part using differential scanning calorimeter and also FEM simulation of impact of injection mold temperature on the crystallization of same part. Analyzed part had circular shape and samples for testing were taken from 4 different locations marked “3, 6, 9, 12” depending on their position (marked like as at clock face), while location 3 was nearest to the mold intake.
Authors: Jakub Šedek, Robin Hron, Martin Kadlec
Abstract: The interlaminar properties of a bond joint of stacked layers in a carbon fibre-reinforced composite with a thermoplastic matrix were evaluated under static loading. The un-precracked tension specimen with an external reinforcing layer was analysed in detail in the area of a bond joint. A detailed finite element method (FEM) analysis was performed to evaluate the influence of the bond joint shape on the interlaminar cohesive forces, which are simulated using the cohesive zone model (CZM). Simple lap and tapered joints were analysed. Continuum and shell elements were utilized in the FEM analysis, and the delamination results obtained using both solutions were compared to each other; however, no significant influence of the bond joint shape on the delamination onset was observed. The FEM analysis was supported using an experimental test on an un-precracked specimen made from prepreg with a carbon fibre fabric and a polyphenylene sulphide (PPS) matrix.
Authors: Tao Yin, Yu Qi Gu, Jie Hua Gao, Wen Yue Yu
Abstract: Poly (phenylene sulfide) (PPS) was blended with polyamide 66 (PA66) in a wide range of compositions by using a co-rotating twin-screw extruder. Scanning electron microscopy and solvent extraction were employed to detect phase morphology of PPS/PA66 composites. The results demonstrated that the phase morphology of PPS/PA66 composites changed from PA66 dispersed phase in PPS matrix to co-continuous phase, and then PPS dispersed phase in PA66 matrix with the increase of PA66 content.
Authors: Tao Yin, Yu Qi Gu, Chun Yu Yu, Zi Xin Li
Abstract: Poly (phenylene sulfide) (PPS) was blended with polyamide 66 (PA66) in a wide range of compositions by using a co-rotating twin-screw extruder. Dynamic mechanical analysis was used in determination of the co-continuous phase. The results allowed to precisely detecting the range of co-continuity. In addition, the mechanical properties of PPS/PA66 composites can also be used to identify the dispersed/matrix phase or co-continuous phase structure.
Authors: Hitonobu Koike, Koshiro Mizobe, Shunsuke Oyama, Yuji Kashima, Kenji Kanemasu, Katsuyuki Kida
Abstract: In this paper, the wear performance of polymer radial ball bearings (PEEK-PTFE and PPS-PTFE) were investigated. For effective operation of equipment in clean energy facilities environment, the polymer bearings were developed. These polymer bearings were produced by machining and their rolling contact fatigue (RCF) behavior under non-lubricated condition was carried out. PEEK accumulation layer with PTFE and graphite was formed on the bearing's inner ring under 3000 rpm high rotation speed. Due to the self-lubrication of PEEK layer, the wear loss of PEEK-PTFE bearing was lower than PPS-PTFE radial bearing. Moreover, it was found that the thin PEEK layer protected the raceway from the friction heat and wear. The wear durability of PEEK-PTFE bearing was superior to PPS-PTFE one.
Authors: Ying Shuai Zhang, Chun Yu Wang, Lei Wang, Jin Wu Cheng, Kai Qiao
Abstract: People pay more and more attention on the fine particle pollution in the air with the improvement of environmental awareness. Coal-fired power plant is an important source of the fine particle emissions. The principles of three dedusting methods applied in coal-fired power plants were explained, which were electrostatic precipitator, bag deduster and composite electrostatic-bag precipitator. In addition, PM2.5 removal efficiency of three dedusting methods was analyzed and discussed based on the test results. The experiment, with the AFC-131test rig, was carried out on dedusting performance of typical filters, to study the effect of pressure drop of filters on the emission characteristics of PPS filter material of different processing technology and posttreatment.
Authors: Shao Feng Zhou, Chao Qun Wu, Lian Hui Chen, Qiao Xin Zhang
Abstract: The mechanical and tribological properties of PA6/PPS blend reinforced by different content of carbon fiber were studied in the manuscript. It was found that the strength, modulus and hardness of PA6/PPS blend is improved apparently though breaking elongation rate and impact strength decreases to some extent. Average friction coefficient value of the carbon fiber reinforced PA6/PPS (PA6/PPS-CF) composites at the state stage is lower than PA6/PPS blend and PA6/PPS-CF10% exhibits the lowest friction coefficient of 0.34. As the content of carbon fiber increases, wear rate of the PA6/PPS-CF composites trends to increasing. These results is useful for providing some practical guidance for the application of polymer materials in the tribological field.
Authors: Ning Mao, Jing Xian Liu, Xi Sun
Abstract: The durability research on the filter media is of great significance. It is necessary to establish a laboratory test method on it in practical use. A new testing method is provided for filter media durability under corrosive gas condition in the paper. PPS is selected as standard testing sample and it is tested in NO gas. Under 1000ppmNO and 200°C condition, both warp strength and weft strength of PPS increase at the beginning and then gradually decrease with duration. The weft change for both strength and elongation is higher than the warp.
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