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Keywords = anionic polyamide 6 (aPA6)

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9 pages, 2083 KiB  
Article
Moisture Adsorption and Desorption Behavior of Raw Materials for the T-RTM Process
by Janek Herzog, Rainer Wendel, Peter G. Weidler, Michael Wilhelm, Philipp Rosenberg and Frank Henning
J. Compos. Sci. 2021, 5(1), 12; https://doi.org/10.3390/jcs5010012 - 5 Jan 2021
Cited by 14 | Viewed by 4148
Abstract
The use of fiber reinforced plastics (FRPs) has significant potential to reduce the weight of components. As regards the sustainability of these components, thermoplastic matrices offer more potential for recycling than thermoset ones. A possible manufacturing process for the production of thermoplastic FRPs [...] Read more.
The use of fiber reinforced plastics (FRPs) has significant potential to reduce the weight of components. As regards the sustainability of these components, thermoplastic matrices offer more potential for recycling than thermoset ones. A possible manufacturing process for the production of thermoplastic FRPs is thermoplastic resin transfer molding (T-RTM). In this very moisture-sensitive process, ε-caprolactam in addition to an activator and catalyst polymerizes anionically to polyamide 6 (aPA6). The anionic polymerization of aPA6 is slowed down or even completely blocked by the presence of water. This study analyses the sorption behavior of the matrix, fiber, binder and core materials for the production of anionic polyamide 6 composites, which are processed in the thermoplastic RTM process. Water vapor sorption measurements are used to determine the adsorption and desorption behavior of the materials. The maximum moisture loading of the materials provides information about the water adsorption capacity of the material. This knowledge is crucial for correct handling of the materials to achieve a fast process and good properties of the final product. Full article
(This article belongs to the Special Issue Advanced Fiber Reinforced Polymer Composites)
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12 pages, 4277 KiB  
Article
Anionic Polymerization of ε-Caprolactam under the Influence of Water: 2. Kinetic Model
by Rainer Wendel, Philipp Rosenberg, Michael Wilhelm and Frank Henning
J. Compos. Sci. 2020, 4(1), 8; https://doi.org/10.3390/jcs4010008 - 10 Jan 2020
Cited by 14 | Viewed by 5353
Abstract
The reaction kinetics of anionic polymerization for the production of anionic polyamide 6 (aPA6) are widely understood. It is also known that this reaction is very sensitive to external influences such as water. This paper analyzes and quantifies the influence of water on [...] Read more.
The reaction kinetics of anionic polymerization for the production of anionic polyamide 6 (aPA6) are widely understood. It is also known that this reaction is very sensitive to external influences such as water. This paper analyzes and quantifies the influence of water on the reaction of ε-caprolactam to anionic polyamide 6. A kinetic model is developed in which the reactive molecules of the activator and catalyst are defined as variables and the concentrations of activator and catalyst as well as water content are considered. A model for the calculation of the reaction kinetics is established and validated with experimental data. The developed model can be used to predict the influence and compensation of water by addition of surplus activator and catalyst during the polymerization of ε-caprolactam. Full article
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