The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Roberto Paganica - One of the best experts on this subject based on the ideXlab platform.
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Accelerated weathering degradation behaviour of polyester thermosetting powder coatings
Progress in Organic Coatings, 2016Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract The development of new products and their introduction in the market need rapid and reliable accelerated durability tests have the capacity to predict the service lifetimes of the materials. In this paper we report time-consuming standardised procedures in order to study the durability and the stability of typical polyester powder coatings, used as surface and structure white Decorative Finish in external architecture. SUNTEST, UVA and UVB accelerated aging tests were done in order to compare the resistance to weathering degradation of different kinds of coatings, four of standard durable and seven of superdurable type. The stability of the single formulation was determined through the evaluation of some chemicals and physical changes on aged samples respect the unaffected one. ATR measurements showed as the degradation differ mainly on the specific type of reactive binder system meanwhile the DSC measurements showed if the accelerate aging processes involved hydrolysis or an increase of the degree of polymerization. A good resistance, in term of gloss and colour retention, were also determined.
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Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis
Progress in Organic Coatings, 2015Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract Thermal stability and thermal degradation kinetics of two different polyester thermosetting powder coatings used as Decorative Finish in outdoor architectural applications, one standard durable and one superdurable, were investigated. The activation energies of the main stages of the degradation processes were determined by applying Kissinger's and Ozawa's equations on TGA data, which were obtained by using a thermobalance at different rates of heating in a mixed atmosphere of oxygen and nitrogen. The superdurable sample has an activation energy higher than that of the standard durable coating. Both the samples showed greater stability with respect to carboxylated polyesters with TGIC as cross-link agent and epoxy resins with dicyandiamide as reticulating agent. The results were compared to those obtained from aging experiment carried out in a oven at three different isothermal temperatures. The activation energy values were obtained from colorimetric measurements of the aged samples. Data from different approaches resulted closely comparable and it was possible to estimate the activation energies of the degradation processes from total chromatic changes with an error lower than 5% with respect to TGA. This last result highlights the possibility of obtaining kinetic data on these coatings also by using the colorimetric technique.
Giulia Gheno - One of the best experts on this subject based on the ideXlab platform.
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Accelerated weathering degradation behaviour of polyester thermosetting powder coatings
Progress in Organic Coatings, 2016Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract The development of new products and their introduction in the market need rapid and reliable accelerated durability tests have the capacity to predict the service lifetimes of the materials. In this paper we report time-consuming standardised procedures in order to study the durability and the stability of typical polyester powder coatings, used as surface and structure white Decorative Finish in external architecture. SUNTEST, UVA and UVB accelerated aging tests were done in order to compare the resistance to weathering degradation of different kinds of coatings, four of standard durable and seven of superdurable type. The stability of the single formulation was determined through the evaluation of some chemicals and physical changes on aged samples respect the unaffected one. ATR measurements showed as the degradation differ mainly on the specific type of reactive binder system meanwhile the DSC measurements showed if the accelerate aging processes involved hydrolysis or an increase of the degree of polymerization. A good resistance, in term of gloss and colour retention, were also determined.
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Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis
Progress in Organic Coatings, 2015Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract Thermal stability and thermal degradation kinetics of two different polyester thermosetting powder coatings used as Decorative Finish in outdoor architectural applications, one standard durable and one superdurable, were investigated. The activation energies of the main stages of the degradation processes were determined by applying Kissinger's and Ozawa's equations on TGA data, which were obtained by using a thermobalance at different rates of heating in a mixed atmosphere of oxygen and nitrogen. The superdurable sample has an activation energy higher than that of the standard durable coating. Both the samples showed greater stability with respect to carboxylated polyesters with TGIC as cross-link agent and epoxy resins with dicyandiamide as reticulating agent. The results were compared to those obtained from aging experiment carried out in a oven at three different isothermal temperatures. The activation energy values were obtained from colorimetric measurements of the aged samples. Data from different approaches resulted closely comparable and it was possible to estimate the activation energies of the degradation processes from total chromatic changes with an error lower than 5% with respect to TGA. This last result highlights the possibility of obtaining kinetic data on these coatings also by using the colorimetric technique.
Renzo Ganzerla - One of the best experts on this subject based on the ideXlab platform.
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Accelerated weathering degradation behaviour of polyester thermosetting powder coatings
Progress in Organic Coatings, 2016Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract The development of new products and their introduction in the market need rapid and reliable accelerated durability tests have the capacity to predict the service lifetimes of the materials. In this paper we report time-consuming standardised procedures in order to study the durability and the stability of typical polyester powder coatings, used as surface and structure white Decorative Finish in external architecture. SUNTEST, UVA and UVB accelerated aging tests were done in order to compare the resistance to weathering degradation of different kinds of coatings, four of standard durable and seven of superdurable type. The stability of the single formulation was determined through the evaluation of some chemicals and physical changes on aged samples respect the unaffected one. ATR measurements showed as the degradation differ mainly on the specific type of reactive binder system meanwhile the DSC measurements showed if the accelerate aging processes involved hydrolysis or an increase of the degree of polymerization. A good resistance, in term of gloss and colour retention, were also determined.
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Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis
Progress in Organic Coatings, 2015Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract Thermal stability and thermal degradation kinetics of two different polyester thermosetting powder coatings used as Decorative Finish in outdoor architectural applications, one standard durable and one superdurable, were investigated. The activation energies of the main stages of the degradation processes were determined by applying Kissinger's and Ozawa's equations on TGA data, which were obtained by using a thermobalance at different rates of heating in a mixed atmosphere of oxygen and nitrogen. The superdurable sample has an activation energy higher than that of the standard durable coating. Both the samples showed greater stability with respect to carboxylated polyesters with TGIC as cross-link agent and epoxy resins with dicyandiamide as reticulating agent. The results were compared to those obtained from aging experiment carried out in a oven at three different isothermal temperatures. The activation energy values were obtained from colorimetric measurements of the aged samples. Data from different approaches resulted closely comparable and it was possible to estimate the activation energies of the degradation processes from total chromatic changes with an error lower than 5% with respect to TGA. This last result highlights the possibility of obtaining kinetic data on these coatings also by using the colorimetric technique.
Marco Bortoluzzi - One of the best experts on this subject based on the ideXlab platform.
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Accelerated weathering degradation behaviour of polyester thermosetting powder coatings
Progress in Organic Coatings, 2016Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract The development of new products and their introduction in the market need rapid and reliable accelerated durability tests have the capacity to predict the service lifetimes of the materials. In this paper we report time-consuming standardised procedures in order to study the durability and the stability of typical polyester powder coatings, used as surface and structure white Decorative Finish in external architecture. SUNTEST, UVA and UVB accelerated aging tests were done in order to compare the resistance to weathering degradation of different kinds of coatings, four of standard durable and seven of superdurable type. The stability of the single formulation was determined through the evaluation of some chemicals and physical changes on aged samples respect the unaffected one. ATR measurements showed as the degradation differ mainly on the specific type of reactive binder system meanwhile the DSC measurements showed if the accelerate aging processes involved hydrolysis or an increase of the degree of polymerization. A good resistance, in term of gloss and colour retention, were also determined.
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Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis
Progress in Organic Coatings, 2015Co-Authors: Giulia Gheno, Renzo Ganzerla, Marco Bortoluzzi, Roberto PaganicaAbstract:Abstract Thermal stability and thermal degradation kinetics of two different polyester thermosetting powder coatings used as Decorative Finish in outdoor architectural applications, one standard durable and one superdurable, were investigated. The activation energies of the main stages of the degradation processes were determined by applying Kissinger's and Ozawa's equations on TGA data, which were obtained by using a thermobalance at different rates of heating in a mixed atmosphere of oxygen and nitrogen. The superdurable sample has an activation energy higher than that of the standard durable coating. Both the samples showed greater stability with respect to carboxylated polyesters with TGIC as cross-link agent and epoxy resins with dicyandiamide as reticulating agent. The results were compared to those obtained from aging experiment carried out in a oven at three different isothermal temperatures. The activation energy values were obtained from colorimetric measurements of the aged samples. Data from different approaches resulted closely comparable and it was possible to estimate the activation energies of the degradation processes from total chromatic changes with an error lower than 5% with respect to TGA. This last result highlights the possibility of obtaining kinetic data on these coatings also by using the colorimetric technique.
Paganica R. - One of the best experts on this subject based on the ideXlab platform.
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Accelerated weathering degradation behaviour of polyester thermosetting powder coatings
2016Co-Authors: Gheno Giulia, Ganzerla Renzo, Bortoluzzi Marco, Paganica R.Abstract:The development of new products and their introduction in the market need rapid and reliable accelerated durability tests have the capacity to predict the service lifetimes of the materials. In this paper we report time-consuming standardised procedures in order to study the durability and the stability of typical polyester powder coatings, used as surface and structure white Decorative Finish in external architecture. SUNTEST, UVA and UVB accelerated aging tests were done in order to compare the resistance to weathering degradation of different kinds of coatings, four of standard durable and seven of superdurable type. The stability of the single formulation was determined through the evaluation of some chemicals and physical changes on aged samples respect the unaffected one. ATR measurements showed as the degradation differ mainly on the specific type of reactive binder system meanwhile the DSC measurements showed if the accelerate aging processes involved hydrolysis or an increase of the degree of polymerization. A good resistance, in term of gloss and colour retention, were also determined. (C) 2016 Elsevier B.V. All rights reserved
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Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis
2015Co-Authors: Gheno Giulia, Ganzerla Renzo, Bortoluzzi Marco, Paganica R.Abstract:Thermal stability and thermal degradation kinetics of two different polyester thermosetting powder coatings used as Decorative Finish in outdoor architectural applications, one standard durable and one superdurable, were investigated. The activation energies of the main stages of the degradation processes were determined by applying Kissinger's and Ozawa's equations on TGA data, which were obtained by using a thermobalance at different rates of heating in a mixed atmosphere of oxygen and nitrogen. The superdurable sample has an activation energy higher than that of the standard durable coating. Both the samples showed greater stability with respect to carboxylated polyesters with TGIC as cross-link agent and epoxy resins with dicyandiamide as reticulating agent. The results were compared to those obtained from aging experiment carried out in a oven at three different isothermal temperatures. The activation energy values were obtained from colorimetric measurements of the aged samples. Data from different approaches resulted closely comparable and it was possible to estimate the activation energies of the degradation processes from total chromatic changes with an error lower than 5% with respect to TGA. This last result highlights the possibility of obtaining kinetic data on these coatings also by using the colorimetric technique. (C) 2014 Elsevier B.V. All rights reserved
