The Experts below are selected from a list of 24402 Experts worldwide ranked by ideXlab platform
Marco Sangermano - One of the best experts on this subject based on the ideXlab platform.
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high refractive index transparent coatings obtained via uv thermal dual Cure Process
Polymer, 2008Co-Authors: Marco Sangermano, Brigitte Voit, Federica Sordo, Klausjochen Eichhorn, Giancarlo RizzaAbstract:Abstract Nanostructured organic–inorganic hybrid epoxy coatings containing zirconia domains were obtained via a cationic UV/thermal dual-Cure Process. Uniform distribution of the in situ generated zirconia within the polymeric network on a nanometric scale (5–25 nm) was demonstrated by AFM and TEM analyses. The UV-Cured films showed increase of the refractive index by increasing the zirconium tetrapropoxide content in the photocurable formulation. Coatings with a drastic cut-off in the UV spectra still maintaining transparency in the visible light were achieved. These coatings could find advanced applications as antireflection coatings, or in the optical industry.
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synthesis and characterization of acrylate oxetane interpenetrating polymer networks through a thermal uv dual Cure Process
Progress in Organic Coatings, 2006Co-Authors: Marco Sangermano, A. Priola, Giulio Malucelli, M ManeaAbstract:In the present work, a thermal-UV dual-Cure Process was performed on acrylate–oxetane systems. A 1:1 molar mixture of difunctional acrylate–oxetane mixture was prepared starting from 2,2-Bis(4-(3-acryloxy-2-hydroxypropoxy)phenyl)propane (BPADA) and 3-ethyl-3-{[(3-ethyloxetan-3-yl)methoxy]methyl}oxetane (OXT-221, DOX). Following a difunctional oxetane-acrylic monomer (OXAC) was synthesized. Starting from the 1:1 molar mixture a heterogeneous IPN is generated by dual Cure Process: the obtained material is characterized by DMTA curves with two maximum of tan δ peak; a broad damping effect can be expected. In the case of OXAC dual Cured system a homogeneous material with no separation domain is obtained, as evidenced by a single tan δ peak in DMTA curves.
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Preparation and characterization of hyperbranched polymer/silica hybrid nanocoatings by dual-curing Process
Macromolecular Materials and Engineering, 2006Co-Authors: Ezio Amerio, A. Priola, Giulio Malucelli, Marco Sangermano, Giancarlo RizzaAbstract:Organic-inorganic nanocomposite hybrid coatings were prepared through a dual-Cure Process involving cationic photopolymerization of a hyperbranched epoxy functionalized resin and subsequent condensation of an alkoxysilane inorganic precursor. All the formulations investigated gave rise to photoCured films characterized by high gel content values. An increase in glass transition temperature and an increase in storage modulus above T-g in the rubbery plateau is observed with increasing TEOS content in the photocurable formulation. The important role of GPTS on reducing the inorganic domain size and avoiding macroscopic phase separation was demonstrated by TEM analyses.
Giancarlo Rizza - One of the best experts on this subject based on the ideXlab platform.
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high refractive index transparent coatings obtained via uv thermal dual Cure Process
Polymer, 2008Co-Authors: Marco Sangermano, Brigitte Voit, Federica Sordo, Klausjochen Eichhorn, Giancarlo RizzaAbstract:Abstract Nanostructured organic–inorganic hybrid epoxy coatings containing zirconia domains were obtained via a cationic UV/thermal dual-Cure Process. Uniform distribution of the in situ generated zirconia within the polymeric network on a nanometric scale (5–25 nm) was demonstrated by AFM and TEM analyses. The UV-Cured films showed increase of the refractive index by increasing the zirconium tetrapropoxide content in the photocurable formulation. Coatings with a drastic cut-off in the UV spectra still maintaining transparency in the visible light were achieved. These coatings could find advanced applications as antireflection coatings, or in the optical industry.
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Preparation and characterization of hyperbranched polymer/silica hybrid nanocoatings by dual-curing Process
Macromolecular Materials and Engineering, 2006Co-Authors: Ezio Amerio, A. Priola, Giulio Malucelli, Marco Sangermano, Giancarlo RizzaAbstract:Organic-inorganic nanocomposite hybrid coatings were prepared through a dual-Cure Process involving cationic photopolymerization of a hyperbranched epoxy functionalized resin and subsequent condensation of an alkoxysilane inorganic precursor. All the formulations investigated gave rise to photoCured films characterized by high gel content values. An increase in glass transition temperature and an increase in storage modulus above T-g in the rubbery plateau is observed with increasing TEOS content in the photocurable formulation. The important role of GPTS on reducing the inorganic domain size and avoiding macroscopic phase separation was demonstrated by TEM analyses.
Tongxiang Liang - One of the best experts on this subject based on the ideXlab platform.
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fiber optic composite Cure sensor monitoring the curing Process of composite material based on intensity modulation
Composites Science and Technology, 2003Co-Authors: Chensha Li, Tongxiang Liang, Qiu Tian, Zhengping Wang, Deqing Zhang, Rongguo Wang, Yingjie Qiao, Chenhe TangAbstract:With the aid of the latest fiber-optic sensing technology, parameters in the Cure Process of thermosetting resin composite can be monitored entirely and efficiently. Based on the behavior of the refractive of resin matrix and intensity modulation of the transmitted light, experiment results of viscosity measurement in composite Cure Process using fiber-optic sensors are presented. The sensor signal can be used to monitor the Process, detect the time when the viscosity of resin matrix is lowest and the end of the Cure without calibration. The experiments of monitoring curing Process of composite materials are successively made in hot-press, model autoclave and large autoclave in the manufacture field, the results are consistent and fit very well with the results of numerical simulation and the results monitored by dynamic dielectric sensor. With this technology, the Cure Process becomes more apparent and controllable, which will greatly improve the Cured products and reduce the cost.
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Fiber-optic composite Cure sensor: Monitoring the curing Process of composite material based on intensity modulation
Composites Science and Technology, 2003Co-Authors: Chensha Li, Libing Wan, Qiu Tian, Maosheng Cao, Zhengping Wang, Deqing Zhang, Hai Tao Liu, Rongguo Wang, Yingjie Qiao, Tongxiang LiangAbstract:With the aid of the latest fiber-optic sensing technology, parameters in the Cure Process of thermosetting resin composite can be monitored entirely and efficiently. Based on the behavior of the refractive of resin matrix and intensity modulation of the transmitted light, experiment results of viscosity measurement in composite Cure Process using fiber-optic sensors are presented. The sensor signal can be used to monitor the Process, detect the time when the viscosity of resin matrix is lowest and the end of the Cure without calibration. The experiments of monitoring curing Process of composite materials are successively made in hot-press, model autoclave and large autoclave in the manufacture field, the results are consistent and fit very well with the results of numerical simulation and the results monitored by dynamic dielectric sensor. With this technology, the Cure Process becomes more apparent and controllable, which will greatly improve the Cured products and reduce the cost. © 2003 Elsevier Ltd. All rights reserved.
Daniel Balageas - One of the best experts on this subject based on the ideXlab platform.
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Embedded Fiber Bragg Grating sensors for industrial composite Cure monitoring
Journal of Intelligent Material Systems and Structures, 1998Co-Authors: V. Dewynter-Marty, M. Dupont, E. Bocherens, S. Bourasseau, H. Beranger, Roberto Carbone, Pierre Ferdinand, Daniel BalageasAbstract:An embedded Fiber Bragg Grating (FBG) strain sensor and an FBG temperature sensor have been shown to be able to accurately monitor the industrial composite Cure Process of a glass/ epoxy plate devoted to aeronautical applications. The internal absolute strain level in the plate was determined, free of temperature effect thanks to a differential method. After curing, a residual compression strain of about -0.22% was observed, which represents a short part of the range in compression for a single mode fiber. Later on, the embedded FBG strain sensor could be used as a smart sensor for the health monitoring of composite structures, e.g. for impact or layer delamination detection.
Shanyi Du - One of the best experts on this subject based on the ideXlab platform.
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Effect of microwave curing Process on the flexural strength and interlaminar shear strength of carbon fiber/bismaleimide composites
Composites Science and Technology, 2016Co-Authors: Xuehong Xu, Ran Wei, Xiaoqun Wang, Shanyi DuAbstract:Microwave heating has been conceived as a rapid and cost-effective method for curing carbon fiber composites. In this paper, microwave radiation was used to Cure carbon fiber/bismaleimide composites aiming at shortening the production cycle time. Through controlling the microwave power, vacuum bagged laminates were fabricated under one atmosphere pressure without arcing. Degree of Cure, void content and fiber volume fraction were measured to evaluate part quality. Three-point flexure and short beam shear testing were employed for mechanical assessment. Variation in the microwave Cure cycle had a significant effect on the material properties. The optimum Processing parameters for microwave curing were established based on analysis of the mechanical performance. A cycle time reduction of nearly 63% was obtained compared to thermal Processing. The physical and mechanical properties of microwave Cured samples were found to be superior to those Cured in a conventional oven. The composite panels manufactured by the optimized microwave Cure Process exhibited a slight decrease in flexural strength but equivalent interlaminar shear strength in comparison with those produced by autoclave curing.
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temperature field of thick thermoset composite laminates during Cure Process
Composites Science and Technology, 2005Co-Authors: Shanyi Du, Boming ZhangAbstract:The development of temperature field of thick thermoset matrix laminates manufactured by autoclave vacuum bag Process were measured and compared with the numerically calculated results. The finite element formulation of the transient heat transfer problem was carried out for polymeric matrix composite materials from the heat transfer differential equations including internal heat generation produced by exothermic chemical reactions. The finite element analysis software, which was based on the general finite element software package, was developed for numerical simulation of the entire composite Process. From the experimental and numerical results, it was found that the measured temperatures profiles were in good agreement with the numerical ones, and conventional Cure cycles recommended by prepreg manufacturers for thin laminates should be modified to reduce out-of-plane temperature gradient.
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An investigation of a fiber optic sensor in the composite Cure Process
Smart Materials and Structures, 1999Co-Authors: Boming Zhang, Shanyi Du, Dianfu Wang, Yinglin SongAbstract:A new sort of fiber optic sensor has been designed. The variation of the refractive index of the resin surrounding the embedded fiber optic was observed by measuring the speckle spatial spectrum at the end-face of the fiber optic. The normalized speckle spatial spectrum is given which depends upon the variation of the refractive index which occurs during the resin Cure Process. The approximate relation between the refractive index and cutoff frequency is given. The instrumental error of the sensor was estimated by measuring to the refractive index of a matching liquid. The resin Cure experimental results are given as measured by the fiber optic sensor. This sort of fiber optic sensor was found to be able to detect the gel point and the end point of the Cure Process. The fiber optic maintains the wave-guide performance after Cure sensing; it was pointed out that this sensor could also be used to sense factors such as temperature and vibration which perturb the structures.
