Abstract. Acrylic polymers have high potential as matrix polymers for carbon fiber reinforced thermoplastic polymers (CFRTP) due to their superior mechanical properties and the fact that they can be fabricated at relatively low temperatures. We focused on improving the interfacial adhesion between carbon fibers (CFs) and acrylic polymers using several functional monomers for co-polymerization with methyl methacrylate (MMA). The copolymerized acrylic matrices showed good adhesion to the CF surfaces. In particular, an acrylic copolymer with acrylamide (AAm) showed high interfacial adhesive strength with CFs compared to pure PMMA, and a hydroxyethyl acrylamide (HEAA) copolymer containing both amide and hydroxyl groups showed high flexural strength of the CFRTP. A 3 mol% HEAA-copolymerized CFRTP achieved a flexural strength almost twice that of pure PMMA matrix CFRTP, and equivalent to that of an epoxy matrix CFRP.
Methacrylic copolymers have high potential as matrix polymers for carbon fiber reinforced thermoplastics (CFRTPs) due to their superior mechanical properties and the versatility of the monomers. However, the methacrylic copolymers have low solvent resistance, compared to epoxy, polyamide, and polypropylene, due to their un-cross-linked amorphous structure. Therefore, an improvement of the solvent resistance by the introduction of metal salts into methacrylic copolymer matrices for CFRTPs was investigated. Infrared spectroscopy, dynamic mechanical analyses and small-angle X-ray scattering clarified that an ionic cross-linked structure was formed. Low-viscosity mixtures of the methacrylic monomers with the metal salts, as a precursor of the matrices for CFRTPs, were easily impregnated into CF fabrics and were then copolymerized within the CF fabrics. Both the flexural strength and shear adhesive strength of the CFRTPs using the in situ polymerized methacrylic ionomer cross-linked with sodium ions were sufficiently high, even after 12 h immersion in methyl ethyl ketone.
It is expected to apply carbon fiber reinforced thermoplastics to industrial fields widely because of secondary remoldablity as well as lightweight and high strength. The authors has developed the carbon fiber reinforced acrylic composites with good adhesion between fibers and matrix and high strength by copolymerizing the functional monomers to matrix resin. In this paper the effect of the copolymerization of hydroxyethylacrylamide(HEAA)on the fatigue life of carbon fiber woven cloth/ acrylic resin laminates was investigated. The shear adhesion tests showed that interfacial strength between carbon fibers and matrix copolymer increased with increasing the content of HEAA. The stronger interfacial strength gave the higher flexural strength of the composites, which is equivalent to that of the conventional carbon fiber/epoxy laminates. As a result of the fatigue tests, the fatigue life became longer as copolymerization ratio increased. In situ observation revealed that the copolymerization of HEAA prevented the crack growth rather than the crack formation.
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