Thermal, rheological, and dielectric analyses of the polymerization reaction of a liquid thermoplastic resin for infusion manufacturing of composite materials
“…They studied the polymerization reaction from infusion via thermal, rheological, and dielectric analysis. 5 Epoxy resin (Araldite LY1564 with Aradur 3486 at a mixing ratio of 100:34 by weight), on the other hand, has a longer pot life. Figure 1.Viscosity profile of Elium 151 SO at various catalyst concentrations in comparison to that of epoxy.…”
Continuous glass fiber reinforced thermoplastic composites have been manufactured and their mechanical properties have been evaluated. A catalyzed monomer is infused through a stack of compacted dry reinforcement under vacuum. The monomer undergoes radical polymerization with a peroxide catalyst. Viscosity and reactivity profile have been characterized to determine the catalyst concentration and temperature of infusion. Glass fiber reinforced thermoplastic composites realized through this method have mechanical properties that are comparable with that of epoxy with an added advantage of excellent toughness and repairability. For example, the residual compressive strength of thermoplastic composites after low-velocity impact is found to be over 140% more than that of epoxy-based composites using the same reinforcement and realized under identical manufacturing methods.
“…They studied the polymerization reaction from infusion via thermal, rheological, and dielectric analysis. 5 Epoxy resin (Araldite LY1564 with Aradur 3486 at a mixing ratio of 100:34 by weight), on the other hand, has a longer pot life. Figure 1.Viscosity profile of Elium 151 SO at various catalyst concentrations in comparison to that of epoxy.…”
Continuous glass fiber reinforced thermoplastic composites have been manufactured and their mechanical properties have been evaluated. A catalyzed monomer is infused through a stack of compacted dry reinforcement under vacuum. The monomer undergoes radical polymerization with a peroxide catalyst. Viscosity and reactivity profile have been characterized to determine the catalyst concentration and temperature of infusion. Glass fiber reinforced thermoplastic composites realized through this method have mechanical properties that are comparable with that of epoxy with an added advantage of excellent toughness and repairability. For example, the residual compressive strength of thermoplastic composites after low-velocity impact is found to be over 140% more than that of epoxy-based composites using the same reinforcement and realized under identical manufacturing methods.
“…Direct FDM printing of these sensor structures in a multi-material process allows for ease of use in open mould processes such as LRI, and potentially has further applications for optimization of cure cycles [20] and flow analysis on-the-fly [13]. It also presents several advantages including: definition of locations in CAD, no assembly required, ease of placement onto complex geometry and low cost of manufacture whilst using a widely accessible technology.…”
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“…It is related to the ionic conductivity, which is the inverse of the ionic viscosity. The ionic viscosity is related to the degree of curing and is used to monitor the curing of thermoset polymers [27][28][29][30][31][32][33][34][35][36][37].…”
Section: Degree Of Curing Measurement Of the Prepregs And Compositesmentioning
confidence: 99%
“…2020, 4, 30 3 of 19 addition of new sensors [33,34]. It can be applied to different systems, such as thermoplastic infusion systems [35], epoxy prepreg systems [36], and even photopolymerized epoxy/acrylic systems [26].This paper presents a new manufacturing process for a glass-fibre-reinforced composite based on UV-cured prepregs. In this study, the curing degree of the prepregs, related to the exposure time, is calculated from measured dielectric parameters.…”
mentioning
confidence: 99%
“…2020, 4, 30 3 of 19 addition of new sensors [33,34]. It can be applied to different systems, such as thermoplastic infusion systems [35], epoxy prepreg systems [36], and even photopolymerized epoxy/acrylic systems [26].…”
A new process for the impregnation, consolidation, and curing of glass-fibre-reinforced polyester composites was developed to reduce manufacturing costs and secure end properties that compete with other traditional materials. This new process, based on the ultraviolet (UV) curing of prepregs, could be a viable alternative to infusion and other processes. In this paper, we showed that glass fibre composites 3 mm thick could be easily formed using suitable photoinitiating systems. We achieved improved mechanical properties through the application of favourable parameters to traditional manufacturing processes such as hand lay-up and infusion. The prepreg polymerization was monitored by dielectric analysis (DEA), and we evaluated the relationship between the UV radiation exposure time and curing degree. Both the exposure time and compaction pressure affected the fibre content of composites and interlaminar shear strength. Experimental results showed that compaction pressures higher than 4 bar are necessary to increase the mechanical properties of the UV-cured composites. Finally, the properties of the composites manufactured by this new process were compared to the properties of composites manufactured using traditional processes such as hand lay-up and infusion.
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