Relevant bibliographies by topics / Transcrystalline

Academic literature on the topic 'Transcrystalline'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Transcrystalline"

1

Klein, Nava, and Gad Marom. "Thermal Expansion of Transcrystalline Strips." Advanced Composites Letters 4, no. 1 (January 1995): 096369359500400. http://dx.doi.org/10.1177/096369359500400102.

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The results of a direct measurement of the longitudinal thermal expansion coefficient of an isolated transcrystalline layer are reported below for a nylon 66 transcrystalline strip grown on a Kevlar 29 aramid fibre. It is shown that the expansivity of the transcrystalline layer is more than an order of magnitude smaller than that of the bulk crystallized matrix. It is hypothesized that the transcrystalline layer relieves thermal stresses in composite materials by matching the expansivities of the constituents.
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Hanmin, Zeng, Zhang Zhiyi, Peng Weizou, and Pu Tiayou. "Transcrystalline structure of PEEK." European Polymer Journal 30, no. 2 (February 1994): 235–37. http://dx.doi.org/10.1016/0014-3057(94)90165-1.

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3

Amitay-Sadovsky, E., S. Zheng, J. Smith, and H. D. Wagner. "Directional indentation of transcrystalline polypropylene." Acta Polymerica 49, no. 10-11 (October 1998): 588–93. http://dx.doi.org/10.1002/(sici)1521-4044(199810)49:10/11<588::aid-apol588>3.0.co;2-h.

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4

Sonzogni, Yann, Ariel Provost, and Pierre Schiano. "Transcrystalline melt migration in clinopyroxene." Contributions to Mineralogy and Petrology 161, no. 3 (July 7, 2010): 497–510. http://dx.doi.org/10.1007/s00410-010-0545-8.

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Wang, Shiwei, Yuting Leng, Guangan Zhang, Ruonan Wang, Shuaijiang Ma, and Qian Li. "Morphology design of isotactic polypropylene composites." Journal of Thermoplastic Composite Materials 31, no. 9 (October 23, 2017): 1252–62. http://dx.doi.org/10.1177/0892705717734907.

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In this article, the high-performance polymer composites were prepared based on the morphology designing method. To begin with, the beta transcrystalline morphology in the interfacial region of isotactic polypropylene (iPP) composites supported by single carbon fiber was formed by the induction of beta nucleating agent (NA) and verified using the polarized light microscopy. Then, to further explore the application of the beta transcrystalline morphology, the way of induction by supported NA was introduced into the iPP injection-molded samples. The result showed that a certain number of interfacial beta transcrystallinity was formed in the adjacent region of carbon nanotubes–modified iPP injection-molded samples. Herein, the mechanical properties are closely related to the interfacial beta transcrystalline morphology, the convective evidence was the improvement of the sample’s impact strength by seven times. Therefore, this work gives a new perspective for the preparation of high-performance composites materials via morphology designing.
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Klein, N., and G. Marom. "Surface Induced Crystallization in Fibre Reinforced Nylon 6,6 Composites." Advanced Composites Letters 1, no. 4 (July 1992): 096369359200100. http://dx.doi.org/10.1177/096369359200100401.

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The present study deals with the growth of transcrystalline layer in Nylon 6,6 reinforced with HM pitch based carbon or aramid fibres. The kinetics of transcrystalline growth is investigated quantitatively. The surface energy parameters that are derived here, can be used to define a better criterion for the nucleation of transcrystallinity from the fibre surface. The free energy difference function, Δσ, as it appears in the classical theory of heterogeneous nucleation is calculated for both aramid and HM carbon fibres.
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Fernández, M. R., J. C. Merino, M. I. Gobernado-Mitre, and J. M. Pastor. "Molecular and Lamellar Orientation of α- and β-Transcrystalline Layers in Polypropylene Composites by Polarized Confocal Micro-Raman Spectroscopy: Raman Imaging by Static Point Illumination." Applied Spectroscopy 54, no. 8 (August 2000): 1105–13. http://dx.doi.org/10.1366/0003702001950724.

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Crystallization of isotactic polypropylene (iPP) from the melt in the presence of poly(ethyleneterephthalate) (PET) fibers has been shown to produce preferential nucleation at the fiber surfaces leading to formation of columnar or transcrystalline growth. The crystalline development of PP has been examined by using optical microscopy. Polarized confocal micro-Raman spectroscopy was carried out to investigate the qualitative molecular orientation of alpha and beta transcrystalline regions around PET fibers embedded in a PP matrix. Uncoated PET fibers generate alpha transcrystallinity (α-TC) due to its strong α-nucleation ability. By coating the reinforcing PET fibers with the appropriate nucleating agent, one induces beta transcrystallinity (β-TC) in the PET fiber-reinforced iPP composites. α-TC layers have been also observed with the use of PET sheets as nucleating substrates. The spectroscopic results reveal that lamellar orientation in alpha transcrystalline structures differs significantly from the beta form. Furthermore, two different molecular orientations in the α-TC have been detected.
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Levitus, D., S. Kenig, M. Kazanci, H. Harel, and G. Marom. "The Effect of Transcrystalline Interface on the Mechanical Properties of Polyethylene / Polyethylene Composites." Advanced Composites Letters 10, no. 2 (March 2001): 096369350101000. http://dx.doi.org/10.1177/096369350101000202.

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The effect of the transcrystalline layer on the longitudinal properties of unidirectional polyethylene/polyethylene (PE/PE) composites was studied. Two sets of PE/PE composites were prepared by quenching and by isothermal crystallisation, respectively, using a wide range of fibre volume fractions. Quenching and isothermal crystallisation were expected, respectively, to prevent or to induce generation of a highly ordered transcrystalline layer. The experimental results showed that isothermal crystallisation produced a substantial positive effect on both the longitudinal strength and modulus, which was attributed to transcrystallinity.
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Schiano, P., A. Provost, R. Clocchiatti, and F. Faure. "Transcrystalline Melt Migration and Earth's Mantle." Science 314, no. 5801 (November 10, 2006): 970–74. http://dx.doi.org/10.1126/science.1132485.

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10

Barber, A. "Crack deflection at a transcrystalline junction." Composites Science and Technology 62, no. 15 (November 2002): 1957–64. http://dx.doi.org/10.1016/s0266-3538(02)00112-4.

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Dissertations / Theses on the topic "Transcrystalline"

1

Neyman, Gennady. "Molecular understanding of the transcrystalline zone in thermoplastic polymers." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1061480030.

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Hardwick, S. T. "The origins and properties of transcrystalline layers in thermoplastics composites." Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379414.

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Clark, Richard L. "Altering the fiber-matrix interphase in semicrystalline polymer matrix composites." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-12042009-020216/.

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Dasari, Aravind. "On toughening and wear/scratch damage in polymer nanocomposites." Thesis, The University of Sydney, 2007. http://hdl.handle.net/2123/1911.

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The drastic improvements in stiffness and strength even with the addition of small percentage of clay to a polymer are commonly traded-off with significant reductions in fracture toughness. It is believed that the presence of a stiff nano-filler will restrict the mobility of the surrounding matrix chains, and thus limit its ability to undergo plastic deformation, thereby decreasing their fracture toughness. To understand the role of rigid nano-fillers, like clay and their constraint effect on the surrounding polymer matrix, the effects of preferentially organized polyamide 6 lamellae in the vicinity of organoclay layers on the toughening processes are studied and compared with polyamide 6 filled with an elastomeric additive (POE-g-MA). It is suggested that to impart high toughness to polymer/organoclay nanocomposites, full debonding at the polymer-organoclay interface is necessary so that shear yielding of large volumes of matrix material can be enhanced. However, due to the strong tethering junctions between the individual organoclay layers and the matrix, full-scale debonding at the polymer-organoclay interface is rarely observed under stress conditions indicating that the constraint on the polymer adjacent to the clay is not relieved. Therefore, this has led to the development of ternary nanocomposites by adding a soft elastomeric dispersed phase to polymer/clay systems to obtain well-balanced mechanical properties. Polyamide 66/SEBS-g-MA/organoclay nanocomposites are prepared with four different blending protocols to understand the effect of blending protocol on the microstructure, mechanical properties and fracture mechanisms of the ternary nanocomposites so as to obtain new insights for producing better toughened polymer nanocomposites. In general, it is found that the level of enhancement of fracture toughness of ternary nanocomposites depends on: (i) the location and extent of dispersion of organoclay and (ii) the internal cavitation of rubber particles leading to effective relief of crack-tip tri-axial constraint and thus activating the matrix plastic deformation. Based on the wear/scratch damage studies on different polymer nanocomposite systems, it is suggested that elastic modulus and toughness of polymer nanocomposites are not the predominant factors controlling the material removal or friction coefficient and cannot be the sole indicators to compare and rank candidate materials. It is also found that nano-fillers by themselves, even if uniformly dispersed with good interfacial interaction with the matrix, do not irrevocably improve the wear (and friction) properties. Although it is important to consider these factors, it is necessary to thoroughly understand all microstructural parameters and their response to wear/scratch damage. Other important factors that should be considered are the formation of a uniform and stable transfer film on the counterface slider and the role of excessive organic surfactants or other modifiers added to disperse nanoparticles in a polymer matrix. It is also emphasized that the mechanisms of removal of materials during the wearing/scratching process should be studied meticulously with the use of high resolution microscopic and other analytical tools as this knowledge is critical to understand the surface integrity of polymer nanocomposites.
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Dasari, Aravind. "On toughening and wear/scratch damage in polymer nanocomposites." University of Sydney, 2007. http://hdl.handle.net/2123/1911.

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Doctor of Philosophy
The drastic improvements in stiffness and strength even with the addition of small percentage of clay to a polymer are commonly traded-off with significant reductions in fracture toughness. It is believed that the presence of a stiff nano-filler will restrict the mobility of the surrounding matrix chains, and thus limit its ability to undergo plastic deformation, thereby decreasing their fracture toughness. To understand the role of rigid nano-fillers, like clay and their constraint effect on the surrounding polymer matrix, the effects of preferentially organized polyamide 6 lamellae in the vicinity of organoclay layers on the toughening processes are studied and compared with polyamide 6 filled with an elastomeric additive (POE-g-MA). It is suggested that to impart high toughness to polymer/organoclay nanocomposites, full debonding at the polymer-organoclay interface is necessary so that shear yielding of large volumes of matrix material can be enhanced. However, due to the strong tethering junctions between the individual organoclay layers and the matrix, full-scale debonding at the polymer-organoclay interface is rarely observed under stress conditions indicating that the constraint on the polymer adjacent to the clay is not relieved. Therefore, this has led to the development of ternary nanocomposites by adding a soft elastomeric dispersed phase to polymer/clay systems to obtain well-balanced mechanical properties. Polyamide 66/SEBS-g-MA/organoclay nanocomposites are prepared with four different blending protocols to understand the effect of blending protocol on the microstructure, mechanical properties and fracture mechanisms of the ternary nanocomposites so as to obtain new insights for producing better toughened polymer nanocomposites. In general, it is found that the level of enhancement of fracture toughness of ternary nanocomposites depends on: (i) the location and extent of dispersion of organoclay and (ii) the internal cavitation of rubber particles leading to effective relief of crack-tip tri-axial constraint and thus activating the matrix plastic deformation. Based on the wear/scratch damage studies on different polymer nanocomposite systems, it is suggested that elastic modulus and toughness of polymer nanocomposites are not the predominant factors controlling the material removal or friction coefficient and cannot be the sole indicators to compare and rank candidate materials. It is also found that nano-fillers by themselves, even if uniformly dispersed with good interfacial interaction with the matrix, do not irrevocably improve the wear (and friction) properties. Although it is important to consider these factors, it is necessary to thoroughly understand all microstructural parameters and their response to wear/scratch damage. Other important factors that should be considered are the formation of a uniform and stable transfer film on the counterface slider and the role of excessive organic surfactants or other modifiers added to disperse nanoparticles in a polymer matrix. It is also emphasized that the mechanisms of removal of materials during the wearing/scratching process should be studied meticulously with the use of high resolution microscopic and other analytical tools as this knowledge is critical to understand the surface integrity of polymer nanocomposites.
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Books on the topic "Transcrystalline"

1

Hardwick, Steven Thomas. The origins and properties of transcrystalline layers in thermoplastics composites. Uxbridge: Brunel University, 1987.

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Book chapters on the topic "Transcrystalline"

1

Hsiao, Benjamin S., and Eric J. H. Chen. "Transcrystalline Interphase in Advanced Polymer Composites." In Controlled Interphases in Composite Materials, 613–22. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-7816-7_57.

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Wanzek, H., A. Fruhner, and J. Fritsche. "Intercrystalline and Transcrystalline Vibration Fatigue Failure in the Inconel 718 Nickel-Based AlloyInter- und transkristalliner Schwingbruch in der Nickel-basis-Legierung Inconel 718." In Schadensfallanalysen metallischer Bauteile, 33–46. München: Carl Hanser Verlag GmbH & Co. KG, 2015. http://dx.doi.org/10.3139/9783446446090.003.

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Thomason, J. L., and A. A. van Rooyen. "The Transcrystallised Interphase in Thermoplastic Composites." In Controlled Interphases in Composite Materials, 423–30. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-7816-7_41.

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Thomason, J. L., and A. A. van Rooyen. "Investigation of the Transcrystallised Interphase in Fibre-Reinforced Thermoplastic Composites." In Integration of Fundamental Polymer Science and Technology—4, 335–42. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0767-6_39.

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"transcrystalline." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1419. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_202251.

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Hata, T., K. Ohsaka, T. Yamada, K. Nakamae, N. Shibata, and T. Matsumoto. "Transcrystalline Region of Polypropylene: Its Formation, Structure and Mechanical Properties *." In Adhesion International 1993, 125–36. CRC Press, 2020. http://dx.doi.org/10.1201/9780367813734-11.

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Conference papers on the topic "Transcrystalline"

1

Yugami, Hiroo, Fumitada Iguchi, Kazuhisa Sato, and Toshiyuki Hashida. "Mechanical Properties of Ceria Based Oxygen Ionic Conductors for SOFC." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65206.

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The fracture strength and creep rate of rear earth (Y and Gd) doped ceria are systematically studied from the viewpoints of dopant concentration, oxygen partial pressure and temperature dependences. Fracture strength and creep rate are measured by modified small punch test and four point bending method, respectively. From results of fracture test, the highest fracture strength is obtained on the samples sintered at 1600 °C for Y and Gd-doped CeO2. The unique temperature dependence of fracture strength on doped CeO2 is observed. It shows the local minimal value at around 600 °C and the fracture strength increases with increasing temperature. The fracture surface structure drastically changes with changing temperature observed by SEM. Since we observed the close coincidence between the fracture strength and the ratio of transcrystalline fracture surface for all samples, it is concluded that the increase of fracture strength at high temperature in doped CeO2 can be attributed to the temperature dependence of transcrystalline fracture strength. Typical creep curves of 2, 5, 10 and 20 YDC were measured under constant load in air. The creep rate decreases with increasing the dopant concentration. From the analysis of creep properties, the creep is controlled by cerium vacancy diffusion and change of ceria vacancy concentration decreases creep rate.
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Youren, Xu, Huang Liping, Fu Xiren, and Yen Tungsheng. "Hot-Pressed Silicon Nitride Ceramics With Rare-Earth Oxides Additives." In ASME 1985 Beijing International Gas Turbine Symposium and Exposition. American Society of Mechanical Engineers, 1985. http://dx.doi.org/10.1115/85-igt-92.

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A hot-pressed silicon nitride ceramic material with rare-earth oxides additive has been processed, its bend strength maintains 800–900 MPa up to 1300°C and measures 680 MPa at 1400°C, its fracture toughness at room temperature is 4.38–4.96 MPam. X-ray, SEM, EDS and electron probe analyses reveal that the microstructure of this material is composed of fine β-Si3N4 grains, α-Si3N4 whiskers, small tetragonal lanthanide crystals and La-containing glassy phase. Observation on fracture surface shows that the fracture path is mainly transcrystalline up to 1400°C. The effects of additives on strength and fracture toughness of HPSN obtained are also discussed.
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WYNN, MATHEW, and NAVID ZOBEIRY. "A FAST METHOD FOR EVALUATING EFFECTS OF PROCESS PARAMETERS ON MORPHOLOGY OF SEMI-CRYSTALLINE THERMOPLASTIC COMPOSITES." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35919.

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Semi-crystalline thermoplastics such as PEEK have microstructures that are influenced by process parameters like temperature cycle, humidity, and oxygen levels. Inclusions such as carbon fibers lead to heterogenous crystal nucleation. Further, manufacturing uncertainties involved with techniques such as automated fiber placement, compression molding, or induction welding influence the microstructure of thermoplastic composites. These contributing factors impact type (e.g., spherulitic, cross-linked, transcrystalline, and needle-like), size and distribution of morphologies in the material. Even with similar degrees of crystallinities, these differences affect mechanical properties and overall performance of composite parts. In this study, an experimental method has been developed that allows for fast evaluation of morphology as a function of process parameters in semi-crystalline thermoplastic composites. A compression fixture in a Dynamic Mechanical Analyzer (DMA) is used to process thin films of thermoplastics with embedded carbon fibers, sandwiched between thin glass covers, while carefully controlling processing conditions including temperature, pressure, and strain rate. The sample morphology is then analyzed using through transmission Polarizing Light Microscopy (PLM). Samples can be reprocessed using DMA several times to analyze changes in microstructure. This experimental approach allows for fast exploration of timetemperature- transformation relationships and their effects on morphology. This can be used to enhance our understanding of the material microstructure and develop more accurate process simulation tools, leading to optimization of processing parameters.
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Reports on the topic "Transcrystalline"

1

Sieradzki, K., and J. W. Wagner. Critical issues in De-alloying and transcrystalline stress-corrosion cracking. Office of Scientific and Technical Information (OSTI), March 1992. http://dx.doi.org/10.2172/5739002.

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Sieradzki, K., and J. W. Wagner. Critical issues in De-alloying and transcrystalline stress-corrosion cracking. Progress report, March 1, 1991--February 28, 1992. Office of Scientific and Technical Information (OSTI), March 1992. http://dx.doi.org/10.2172/10129632.

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