The Experts below are selected from a list of 27159 Experts worldwide ranked by ideXlab platform
Jin Zhu - One of the best experts on this subject based on the ideXlab platform.
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Tensile property balanced and gas barrier improved poly lactic acid by blending with biobased poly butylene 2 5 furan dicarboxylate
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Yu Long, Ruoyu Zhang, Juncheng Huang, Jinggang Wang, Yanhua Jiang, Jian Yang, Jin ZhuAbstract:A biobased poly(butylene 2,5-furan dicarboxylate) (PBF) is synthesized and blended with poly(lactic acid) (PLA). With only 5 wt % addition of PBF, the elongation at break of PLA becomes 18.5 times more than before, while the Tensile modulus and Tensile strength at yield keep almost the same. Morphological analysis based on scanning electron microscope pictures shows drastic shape deformation of PBF dispersed phases from sphere to fibril. The elongation ratio of PBF phase is much larger than that of PLA matrix, which is caused by a possible “plastic-rubber” transition in PBF during stretch process. On the other hand, stretch induced crystallization in PBF happened and it may increase the modulus of PBF along the Tensile Direction. Probably with the above two phenomena, PLA is dynamically toughened and strengthened in the elongation procedure. Moreover, the impact strength of the blends is better than those of the two pure components, and rubber-plastic transition and crystallization of PBF could improve th...
Yu Long - One of the best experts on this subject based on the ideXlab platform.
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Tensile property balanced and gas barrier improved poly lactic acid by blending with biobased poly butylene 2 5 furan dicarboxylate
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Yu Long, Ruoyu Zhang, Juncheng Huang, Jinggang Wang, Yanhua Jiang, Jian Yang, Jin ZhuAbstract:A biobased poly(butylene 2,5-furan dicarboxylate) (PBF) is synthesized and blended with poly(lactic acid) (PLA). With only 5 wt % addition of PBF, the elongation at break of PLA becomes 18.5 times more than before, while the Tensile modulus and Tensile strength at yield keep almost the same. Morphological analysis based on scanning electron microscope pictures shows drastic shape deformation of PBF dispersed phases from sphere to fibril. The elongation ratio of PBF phase is much larger than that of PLA matrix, which is caused by a possible “plastic-rubber” transition in PBF during stretch process. On the other hand, stretch induced crystallization in PBF happened and it may increase the modulus of PBF along the Tensile Direction. Probably with the above two phenomena, PLA is dynamically toughened and strengthened in the elongation procedure. Moreover, the impact strength of the blends is better than those of the two pure components, and rubber-plastic transition and crystallization of PBF could improve th...
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Tensile Property Balanced and Gas Barrier Improved Poly(lactic acid) by Blending with Biobased Poly(butylene 2,5-furan dicarboxylate)
2017Co-Authors: Yu Long, Zhang Ruoyu, Huang Juncheng, Wang Jinggang, Jiang Yanhua, Hu Guo-hua, Yang Jian, Zhu JinAbstract:A biobased poly(butylene 2,5-furan dicarboxylate) (PBF) is synthesized and blended with poly(lactic acid) (PLA). With only 5 wt % addition of PBF, the elongation at break of PLA becomes 18.5 times more than before, while the Tensile modulus and Tensile strength at yield keep almost the same. Morphological analysis based on scanning electron microscope pictures shows drastic shape deformation of PBF dispersed phases from sphere to fibril. The elongation ratio of PBF phase is much larger than that of PLA matrix, which is caused by a possible "plastic-rubber" transition in PBF during stretch process. On the other hand, stretch induced crystallization in PBF happened and it may increase the modulus of PBF along the Tensile Direction. Probably with the above two phenomena, PLA is dynamically toughened and strengthened in the elongation procedure. Moreover, the impact strength of the blends is better than those of the two pure components, and rubber-plastic transition and crystallization of PBF could improve the impact toughness too. The gas barrier property of PLA/PBF blends is also significantly enhanced by the introduction of a furan ring. It can be concluded that PLA/PBF blends are a good base material with great potential for future development in different areas
Costantino Creton - One of the best experts on this subject based on the ideXlab platform.
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Covalent Bond Scission in the Mullins Effect of a Filled Elastomer: Real-Time Visualization with Mechanoluminescence
Advanced Functional Materials, 2016Co-Authors: Jess M. Clough, Costantino Creton, Stephen L. Craig, Rint P. SijbesmaAbstract:Strain-induced light emission from mechanoluminescent cross-linkers in silica-filled poly(dimethylsiloxane) demonstrates that covalent bond scission contributes significantly to irreversible stress-softening upon the initial extension, known as the Mullins effect. The cross-linkers contain dioxetanes that emit light upon force-induced bond scission. The filled elastomer emits light in cyclic uniaxial tension, but only on exceeding the previous maximum strain. The amount of light increases with hysteresis energy in a power law of exponent 2.0, demonstrating that covalent bond scission becomes increasingly important in the strain regime studied. Below 100%–120% strain, corresponding to energy absorption of (0.082 ± 0.012) J cm−3, mechanoluminescence is not detectable. Calibration of the light intensity indicates that by 190% strain, less than 0.1% of the dioxetane moieties break. Small but significant amounts of light are emitted upon unloading, suggesting a complex stress transfer to the dioxetanes mediated by the fillers. Pre-strained material emits light on straining perpendicularly, but not parallel to the original Tensile Direction, demonstrating that covalent bond scission is highly anisotropic. These findings show that the scission of even a small number of covalent bonds plays a discernible role in the Mullins effect in filled silicone elastomers. Such mechanisms may be active in other types of filled elastomers.
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nanocavitation in carbon black filled styrene butadiene rubber under tension detected by real time small angle x ray scattering
Macromolecules, 2012Co-Authors: Huan Zhang, Hugh R Brown, Arthur K Scholz, Jordan De Crevoisier, Fabien Vionloisel, Gilles Besnard, Alexander Hexemer, Edward J Kramer, Costantino CretonAbstract:Nanocavitation was detected for the first time in carbon black filled styrene–butadiene rubber (CB-SBR) under uniaxial loading by real time small-angle X-ray scattering (SAXS) using synchrotron X-ray radiation. A three phase model was developed to calculate the void volume fraction from the scattering invariant Q determined from the observed SAXS patterns. The normalized scattering invariant Q/Q0, where Q0 is the invariant before deformation, greatly increased above a critical extension ratio λonset which we attribute to the formation of nanovoids. Analysis of the 2D scattering patterns show that voids formed are 20–40 nm in size and elongated along the Tensile Direction. Cavities formed beyond λonset are smaller as λ increases. Results from the scattering experiments are strongly supported by macroscopic volume change measurements on the samples under similar uniaxial strain. A nearly constant nanocavitation stress σonset (25 MPa) was observed when the filler volume fraction ϕCB was larger than 14%. This...
Jinggang Wang - One of the best experts on this subject based on the ideXlab platform.
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Tensile property balanced and gas barrier improved poly lactic acid by blending with biobased poly butylene 2 5 furan dicarboxylate
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Yu Long, Ruoyu Zhang, Juncheng Huang, Jinggang Wang, Yanhua Jiang, Jian Yang, Jin ZhuAbstract:A biobased poly(butylene 2,5-furan dicarboxylate) (PBF) is synthesized and blended with poly(lactic acid) (PLA). With only 5 wt % addition of PBF, the elongation at break of PLA becomes 18.5 times more than before, while the Tensile modulus and Tensile strength at yield keep almost the same. Morphological analysis based on scanning electron microscope pictures shows drastic shape deformation of PBF dispersed phases from sphere to fibril. The elongation ratio of PBF phase is much larger than that of PLA matrix, which is caused by a possible “plastic-rubber” transition in PBF during stretch process. On the other hand, stretch induced crystallization in PBF happened and it may increase the modulus of PBF along the Tensile Direction. Probably with the above two phenomena, PLA is dynamically toughened and strengthened in the elongation procedure. Moreover, the impact strength of the blends is better than those of the two pure components, and rubber-plastic transition and crystallization of PBF could improve th...
Yanhua Jiang - One of the best experts on this subject based on the ideXlab platform.
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Tensile property balanced and gas barrier improved poly lactic acid by blending with biobased poly butylene 2 5 furan dicarboxylate
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Yu Long, Ruoyu Zhang, Juncheng Huang, Jinggang Wang, Yanhua Jiang, Jian Yang, Jin ZhuAbstract:A biobased poly(butylene 2,5-furan dicarboxylate) (PBF) is synthesized and blended with poly(lactic acid) (PLA). With only 5 wt % addition of PBF, the elongation at break of PLA becomes 18.5 times more than before, while the Tensile modulus and Tensile strength at yield keep almost the same. Morphological analysis based on scanning electron microscope pictures shows drastic shape deformation of PBF dispersed phases from sphere to fibril. The elongation ratio of PBF phase is much larger than that of PLA matrix, which is caused by a possible “plastic-rubber” transition in PBF during stretch process. On the other hand, stretch induced crystallization in PBF happened and it may increase the modulus of PBF along the Tensile Direction. Probably with the above two phenomena, PLA is dynamically toughened and strengthened in the elongation procedure. Moreover, the impact strength of the blends is better than those of the two pure components, and rubber-plastic transition and crystallization of PBF could improve th...
