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  • Thermoset Composites
    or of a combination of carbon and glass fibers, laid up in multilayer fashion to form extremely rigid, strong structures. More than 95% of thermoset composite parts are based on polyester and epoxy resins; of the two, polyester systems predominate in volume by far. Other thermoset resins used
  • Epoxy
    Epoxy polymers are cured to form thermoset resins by either homopolymerization of epoxy groups with themselves, or reaction with curing agents such as anhydrides, amines, and novolacs. Because the curing agent contributes significantly to the cured properties of the resin, this is called
  • Self-Healing spacecraft
    composite structures: They don't tolerate impacts, i.e., they have low fracture toughness and don't resist crack propagation. Unlike metals that can absorb a significant amount of impact, thermoset composites absorb energy by elastically deforming or fracturing. Impact loads typically generate microcracks
  • Adhesives
    and prevent damage that might occur if a stiff fastening system were used. Thermoset adhesives, such as epoxies and anaerobics, can be formulated to retain much of their strength over a broad temperature range, up to 300 F. Selecting a curing temperature close to the operating temperature can
  • Stick With the Right Adhesive
    and cyanoacrylates, hot melts, reactive urethanes, epoxies, polyurethanes, and two-part acrylics. are one-part adhesives that remain liquid in air but cure into tough thermoset plastics when confined between metal substrates. Anaerobic adhesives typically are used to lock and seal threaded assemblies, retain
  • Predicting plastic part life
    Dynamic mechanical analysis helps designers build longer lasting products. Edited by Jean M. Hoffman DMA testing helps determine the effect of different curing conditions on thermoset polyester products. DMA demonstrates the degree of cure based on the stiffness and glass transition temperature
  • Medical Device Link .
    many unique issues to the fore, such as biocompatibility and repeated exposure to sterilization. Manufacturers can currently choose from either thermoset plastics or thermoplastics. Thermosets flow during molding and then cure or harden irreversibly. However, if they are overheated after curing
  • Secrets of Bond Strength
    the maximum strength and long-term resistance to deterioration is through a chemical or electrolytic pretreatment, particularly on thermoset and thermoplastic surfaces. Molded, cast, and laminated parts made f rom thermos et plastics such as glass-reinforced epoxy (GRE), glass and carbon-reinforced

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