高分子材料与应用(英文版) Chapter 4 Thermosets.ppt
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1、Chapter 4 Thermosets,Thermosets,Resin Phenolics Epoxies Melamines Silicones Polyesters Composites Thermoset vs. thermoplastic,General Properties of Thermosets,Strength Flexibility Thermal Creep Ability to reinforce Ability to cure at room temperature,Formaldehyde Resins,Phenolics Urea formaldehyde M
2、elamine formaldehyde,Crosslinking of Phenolics,Reactive GroupsPhenolics,Phenol,Formaldehyde,Plus,Compression Molding,Compression molding was specifically developed for replacement of metal components with composite parts. The molding process can be carried out with either thermosets or thermoplastic
3、s. However, most applications today use thermoset polymers. In fact,compression molding is the most common method of processing thermosets.,Resin Transfer Molding,In the RTM process, dry (i.e.,unimpregnated ) reinforcement is pre-shaped and oriented into skeleton of the actual part known as the pref
4、orm which is inserted into a matched die mold. The heated mold is closed and the liquid resin is injected The part is cured in mold. The mold is opened and part is removed from mold.,Injection Molding Glass Reinforced Composites,Plastic pellets with glass fibers are melted in screw, injected into a
5、cold mold, and then ejected.,Glass filled resin pellets,Application of Phenolics,Wiring devices Switch gear Circuit breakers Insulators Gears Wear guides Pulleys Rollers,Amino Resins (UF and MF),Formaldehyde + -NH2(amine group) (1) Urea-formaldehyde (2) Melamine-formaldehyde,Crosslinking,Reactive Gr
6、oupsAmino plastics,Amine,Plus,Formaldehyde,Urea formaldehyde,Melamine,Crosslinking as Polymers are Formed,Formaldehyde,Plus,Crosslinking as Polymers are Formed,Melamine Formaldehyde,Water,Crosslinking as Polymers are Formed,Melamine Formaldehyde,Water,Amine plastics clear adhesive,Chipboard,Applicat
7、ions: wood particleboard, plywood, boat hulls flooring furniture assemblies Cellulose-filled urea compound: Electrical wall plates, receptacles, knobs, handle Cellulose-filled melamine compound: dinnerware, buttons, control buttons, knob,Application of melamine plastics,Melamine Plastics,Polyester T
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