title: Evaluation of two matrix materials intended for fiber-reinforced polymers.
abstract: Two matrix resins for fiber composites that remain in a fluid state during storage and handling before polymerization were evaluated. The resin mixtures, based on methyl methacrylate (MMA), were produced with two different cross-linking agent systems: 1,4-butanediol dimethacrylate and ethylene glycol dimethacrylate or diethylene glycol dimethacrylate. Water sorption, water solubility, water uptake and residual MMA monomer were determined. Thermomechanical analysis was used to determine linear dimensional changes as a function of temperature. Flexural strength and modulus as well as fracture work and the maximum stress intensity factor were determined. The results revealed similar values for both matrix polymers regarding water sorption, water solubility, water uptake, residual MMA monomer (0.5 wt% (+/- 0.03)) and coefficient of linear thermal expansion. Flexural strength for polymer B was 68.7 MPa (+/- 9.8) compared to 56.0 MPa (+/- 13.3) for polymer A when tested dry and 64 MPa (+/- 6.1) compared to (54 MPa (+/- 3.3) when water-saturated. Fracture toughness tests showed higher maximum stress intensity factor values for polymer B (0.75 +/- 0.17) MPa x m1/2 than for polymer A (0.55 +/- 0.12) MPa x m1/2. The resin binders showed an appropriate consistency while remaining in a fluid state during storage and manipulation.
authors.affiliation: NIOM, Scandinavian Institute of Dental Materials, Haslum, Norway.
authors.forename: Susanna
authors.initials: S
authors.lastname: Segerström
authors.forename: Gökçe
authors.initials: G
authors.lastname: Meriç
authors.forename: Torbjørn
authors.initials: T
authors.lastname: Knarvang
authors.forename: I Eystein
authors.initials: IE
authors.lastname: Ruyter
mesh_terms: D000042:Absorption; D000327:Adsorption; D003188:Composite Resins / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry*; D018583:Pliability; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011143:Polyvinyl Chloride / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D012995:Solubility; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003432:Cross-Linking Reagents; D008689:Methacrylates; D011145:Polyvinyls; D014867:Water; D020366:Methylmethacrylate; C013215:polyvinyl acetate; C004919:ethylene dimethacrylate; D011143:Polyvinyl Chloride; D019904:Polymethyl Methacrylate; C102737:1,4-butanediol dimethacrylate