The Experts below are selected from a list of 44286 Experts worldwide ranked by ideXlab platform
Mingshu Yang - One of the best experts on this subject based on the ideXlab platform.
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photo Oxidative Degradation of polypropylene montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polypropylene/montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polyethylene/montmorillonite nanocomposite
Polymer Degradation and Stability, 2003Co-Authors: Huaili Qin, Chungui Zhao, Shimin Zhang, Guangming Chen, Mingshu YangAbstract:Abstract Photo-Oxidative Degradation is critical to polymer materials. It is even the case in polymer/layered silicate nanocomposites. A UV photo-Oxidative Degradation study on polyethylene/montmorillonite (PE/MMT) nanocomposite was carried out by FT-IR technique. It is indicated that the rate of photo-Oxidative Degradation of PE/MMT nanocomposite is much faster than that of pure PE. The acceleration of photo-Oxidative Degradation of PE/MMT nanocomposite is due to the effect of MMT and ammonium ion, in which the effect of ammonium ion is primary. It has been found that the dispersion state (either nano- or micro-) of MMT does not seem conclusive on the acceleration of Degradation. Fe 3+ modified MMT can also accelerate the photo-Oxidative Degradation of PE matrix.
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photo Oxidative Degradation of polyethylene montmorillonite nanocomposite
Polymer Degradation and Stability, 2003Co-Authors: Huaili Qin, Chungui Zhao, Shimin Zhang, Guangming Chen, Mingshu YangAbstract:Abstract Photo-Oxidative Degradation is critical to polymer materials. It is even the case in polymer/layered silicate nanocomposites. A UV photo-Oxidative Degradation study on polyethylene/montmorillonite (PE/MMT) nanocomposite was carried out by FT-IR technique. It is indicated that the rate of photo-Oxidative Degradation of PE/MMT nanocomposite is much faster than that of pure PE. The acceleration of photo-Oxidative Degradation of PE/MMT nanocomposite is due to the effect of MMT and ammonium ion, in which the effect of ammonium ion is primary. It has been found that the dispersion state (either nano- or micro-) of MMT does not seem conclusive on the acceleration of Degradation. Fe 3+ modified MMT can also accelerate the photo-Oxidative Degradation of PE matrix.
Huaili Qin - One of the best experts on this subject based on the ideXlab platform.
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photo Oxidative Degradation of polypropylene montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polypropylene/montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polyethylene/montmorillonite nanocomposite
Polymer Degradation and Stability, 2003Co-Authors: Huaili Qin, Chungui Zhao, Shimin Zhang, Guangming Chen, Mingshu YangAbstract:Abstract Photo-Oxidative Degradation is critical to polymer materials. It is even the case in polymer/layered silicate nanocomposites. A UV photo-Oxidative Degradation study on polyethylene/montmorillonite (PE/MMT) nanocomposite was carried out by FT-IR technique. It is indicated that the rate of photo-Oxidative Degradation of PE/MMT nanocomposite is much faster than that of pure PE. The acceleration of photo-Oxidative Degradation of PE/MMT nanocomposite is due to the effect of MMT and ammonium ion, in which the effect of ammonium ion is primary. It has been found that the dispersion state (either nano- or micro-) of MMT does not seem conclusive on the acceleration of Degradation. Fe 3+ modified MMT can also accelerate the photo-Oxidative Degradation of PE matrix.
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photo Oxidative Degradation of polyethylene montmorillonite nanocomposite
Polymer Degradation and Stability, 2003Co-Authors: Huaili Qin, Chungui Zhao, Shimin Zhang, Guangming Chen, Mingshu YangAbstract:Abstract Photo-Oxidative Degradation is critical to polymer materials. It is even the case in polymer/layered silicate nanocomposites. A UV photo-Oxidative Degradation study on polyethylene/montmorillonite (PE/MMT) nanocomposite was carried out by FT-IR technique. It is indicated that the rate of photo-Oxidative Degradation of PE/MMT nanocomposite is much faster than that of pure PE. The acceleration of photo-Oxidative Degradation of PE/MMT nanocomposite is due to the effect of MMT and ammonium ion, in which the effect of ammonium ion is primary. It has been found that the dispersion state (either nano- or micro-) of MMT does not seem conclusive on the acceleration of Degradation. Fe 3+ modified MMT can also accelerate the photo-Oxidative Degradation of PE matrix.
Shimin Zhang - One of the best experts on this subject based on the ideXlab platform.
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photo Oxidative Degradation of polypropylene montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polypropylene/montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polyethylene/montmorillonite nanocomposite
Polymer Degradation and Stability, 2003Co-Authors: Huaili Qin, Chungui Zhao, Shimin Zhang, Guangming Chen, Mingshu YangAbstract:Abstract Photo-Oxidative Degradation is critical to polymer materials. It is even the case in polymer/layered silicate nanocomposites. A UV photo-Oxidative Degradation study on polyethylene/montmorillonite (PE/MMT) nanocomposite was carried out by FT-IR technique. It is indicated that the rate of photo-Oxidative Degradation of PE/MMT nanocomposite is much faster than that of pure PE. The acceleration of photo-Oxidative Degradation of PE/MMT nanocomposite is due to the effect of MMT and ammonium ion, in which the effect of ammonium ion is primary. It has been found that the dispersion state (either nano- or micro-) of MMT does not seem conclusive on the acceleration of Degradation. Fe 3+ modified MMT can also accelerate the photo-Oxidative Degradation of PE matrix.
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photo Oxidative Degradation of polyethylene montmorillonite nanocomposite
Polymer Degradation and Stability, 2003Co-Authors: Huaili Qin, Chungui Zhao, Shimin Zhang, Guangming Chen, Mingshu YangAbstract:Abstract Photo-Oxidative Degradation is critical to polymer materials. It is even the case in polymer/layered silicate nanocomposites. A UV photo-Oxidative Degradation study on polyethylene/montmorillonite (PE/MMT) nanocomposite was carried out by FT-IR technique. It is indicated that the rate of photo-Oxidative Degradation of PE/MMT nanocomposite is much faster than that of pure PE. The acceleration of photo-Oxidative Degradation of PE/MMT nanocomposite is due to the effect of MMT and ammonium ion, in which the effect of ammonium ion is primary. It has been found that the dispersion state (either nano- or micro-) of MMT does not seem conclusive on the acceleration of Degradation. Fe 3+ modified MMT can also accelerate the photo-Oxidative Degradation of PE matrix.
Deyan Shen - One of the best experts on this subject based on the ideXlab platform.
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photo Oxidative Degradation of polypropylene montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
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Photo-Oxidative Degradation of polypropylene/montmorillonite nanocomposites
Polymer, 2005Co-Authors: Huaili Qin, Shimin Zhang, Mingshu Yang, Huiju Liu, Shaobo Xie, Deyan ShenAbstract:The photo-Oxidative behavior of the polypropylene (PP)/montmorillonite (MMT) nanocomposites and microcomposites has been investigated upon ultraviolet exposure using the technique of infrared spectroscopy. The rate of photo-Oxidative Degradation of PP/MMT nanocomposites is much faster than that of pure PP. The influence of pristine MMT, alkylammonium and compatibilizer were investigated, respectively. All these components can catalyze the photo-oxidation of PP matrix, in which the influence of compatibilizer and pristine MMT is primary. Moreover, the dispersion state of the clay particles in the polymer matrices has a little influence on the photo-Oxidative Degradation of polymer matrix. Consequently, an integrated catalysis mechanism of the photo-Oxidative Degradation of PP clay nanocomposite is proposed. It would provide benefit direction for the preparation and usage of polymer layered silicate nanocomposites (PLSN).
Giridhar Madras - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of microwave‐assisted Oxidative Degradation of polystyrene in solution
AIChE Journal, 2003Co-Authors: G Sivalingam, Nitin Agarwal, Giridhar MadrasAbstract:The kinetics of the Oxidative Degradation of polystyrene in dichlorobenzene in the presence of benzoyl peroxide was studied in a microwave reactor. Solutions with peroxide concentration ranging from 15 to $40 kg/m^3$ were irradiated by microwave of 700 W and frequency of 2.45 MHz with a different cycle heating period ranging from 20 to 45 s. The molecular-weight distributions were measured as a function of reaction time by gel permeation chromatography. Because the temperature of the system continuously varies with reaction time, a radical mechanism for Oxidative Degradation based on continuous distribution kinetics with time/temperature-dependent rate coefficients was proposed. The activation energy of 46.4 kJ/mol for the microwave-assisted Oxidative Degradation of polystyrene was obtained by nonlinearly regressing the experimental data.
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Optimum temperature for Oxidative Degradation of poly(vinyl acetate) in solution
Chemical Engineering Science, 2001Co-Authors: Giridhar Madras, Sujay ChattopadhyayAbstract:The Oxidative Degradation of poly(vinyl acetate) (PVAc) was carried out in presence of benzoyl peroxide at 70-123 degreesC in a batch reactor by dissolving PVAc in chlorobenzene. The molecular weight distributions(MWDs) were measured as a function of reaction time by gel permeation chromatography. Experimental data indicates Degradation occurs by random chain scission only without cross-linking and repolymerization. A radical mechanism for the Oxidative Degradation was proposed and modeled based on continuous distribution kinetics. An optimum temperature of 110 degreesC was observed for maximum Degradation. The energy of activation of the random scission Oxidative Degradation rate coefficient, determined from the temperature dependence, was 20 kcal/mol.
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Continuous distribution kinetics for Oxidative Degradation of PMMA in solution
Polymer Degradation and Stability, 2001Co-Authors: Giridhar Madras, Vishal KarmoreAbstract:The Oxidative Degradation of poly(methyl methacrylate) (PMMA) was investigated in chlorobenzene at 50–100°C for various peroxide and polymer concentrations. Unlike thermal Degradation, the chain scission of PMMA occurs randomly across the polymer backbone. The samples were analyzed by gel permeation chromatography (GPC) to obtain the time evolution of molecular weight distributions (MWDs). A continuous distribution model for polymer Degradation and simultaneous peroxide deactivation was developed assuming that the rate coefficients depend linearly on MW. This model was used to determine the rate coefficients for the Oxidative Degradation of PMMA. The activation energy, determined from the temperature dependence of the rate coefficients, was 48.2 kcal/mol.
