Abstract
Composites consisting of propargyl- and allyl/propargyl- modified novolac resins and carbon fabric were obtained by the vacuum infusion molding process. It was established that the presence of potassium cations remaining after the synthesis increase the resin melt viscosity, and acid washing is needed to obtain resins suitable for cost-effective injection techniques of composite fabrication. The mechanical properties of all composites such as compressive strength, tensile strength, in plane shear strength, and interlaminar shear strength were determined at 25, 200 and 230 °С. The carbon fiber reinforced plastics (CFRPs) retained their mechanical properties at temperatures up to 200 °C. It was shown that the use of the obtained allyl-containing polymer matrices improved mechanical properties and increased the thermal stability of the CFRPs in comparison with the propargylated novolac matrices. The composite material with novolac matrices modified by 18% propargyl and 23% allyl groups retains only up to 70% of the initial interlaminar shear strength values at 230 °C which corresponds to the data of the dynamic mechanical analysis of neat cured resins.
Highlights
Carbon fiber reinforced plastics (CFRPs) are materials widely used in aircraft and marine production, sports industry, etc
We hypothesized that CFRPs with a matrix of phenol-formaldehyde resins modified with both allyl and propargyl groups would be characterized by high mechanical properties and good processability
Novolacs modified by propargyl or both propargyl and allyl groups with a total substitution of 50% were investigated as matrices for CFRP obtained by vacuum infusion (Table 1) [18]
Summary
Carbon fiber reinforced plastics (CFRPs) are materials widely used in aircraft and marine production, sports industry, etc. Vacuum infusion molding process (VIMP) has been considered as an attractive method to produce CFRP composites with low cost and good performance [1]. VIMP process requires low viscosity of the molding resin. The phenolic resins modified by additional curable groups are of great interest due to improved heat resistance and better processability in deriving void-free composites [5]. Propargyl ether-functional phenolic resins were designed to substitute for Carbon Fabric Reinforced Addition-Cure Phenolic Resins Based on Propargyl and Allyl Ether polymer matrix [18]. We hypothesized that CFRPs with a matrix of phenol-formaldehyde resins modified with both allyl and propargyl groups would be characterized by high mechanical properties and good processability
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