Process for Improvement in Toughness of Unsaturated Polyester with Elastomer
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T. Sakai
Abstract
By combined usage of a high speed intermeshing twin screw extruder and an injection molding press, a direct reactive extrusion and injection molding process has been developed for improving toughness of the thermoset unsaturated polyester (UP) by blending with an elastomer.
The unsaturated polyester and elastomer were homogenously kneaded with each other and a radical initiator dissolved in a liquid monomer was added to the molten mixture. This was carried out at a relatively low temperature from the final feeding port of the twin screw extruder to allow not the curing reaction to proceed during the twin screw extrusion stage.
The molten UP-elastomer alloy was accumulated, injected into the hot mold, and cured. The products obtained from these experiments were evaluated with regards to their physical properties and their morphologies. The elastomer, NBR produced the greatest improvement in toughness. The physical properties of the UP-NBR alloy obtained by this reactive extrusion process were generally equivalent to those of polypropylene except for thermal characteristics.
© 1992, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Continuous Mixing and Compounds
- Starve-fed Flow in Co-Rotating Twin Screw Extruders
- Process for Improvement in Toughness of Unsaturated Polyester with Elastomer
- Mechanical Properties of Thermoplastic Polyurethane Blends and Copolymers of Styrene and Acrylonitrile
- Extrusion
- Mixing on Melting in Single Screw Extrusion
- Numerical Study of Slip at the Walls in the Extruder
- Elimination of Sag in Plastic Pipe Extrusion
- Fibers and Film
- Issues Concerning the Rate of Heat Transfer from a Spinline
- Skew Stretched Polycarbonate Films
- Molding
- Molecular Orientation in Injection-Molded Polypropylene Copolymers with Ethylene
- Melt-recrystallization of Talc-filled Polypropylene Injection Moldings
- Processing Characteristics of Thermoplastic Sheet Composites
- Rapid Communication of Recent Advances
- The Face-relief Strategy for Design of Profile Dies
Artikel in diesem Heft
- Contents
- Contents
- Continuous Mixing and Compounds
- Starve-fed Flow in Co-Rotating Twin Screw Extruders
- Process for Improvement in Toughness of Unsaturated Polyester with Elastomer
- Mechanical Properties of Thermoplastic Polyurethane Blends and Copolymers of Styrene and Acrylonitrile
- Extrusion
- Mixing on Melting in Single Screw Extrusion
- Numerical Study of Slip at the Walls in the Extruder
- Elimination of Sag in Plastic Pipe Extrusion
- Fibers and Film
- Issues Concerning the Rate of Heat Transfer from a Spinline
- Skew Stretched Polycarbonate Films
- Molding
- Molecular Orientation in Injection-Molded Polypropylene Copolymers with Ethylene
- Melt-recrystallization of Talc-filled Polypropylene Injection Moldings
- Processing Characteristics of Thermoplastic Sheet Composites
- Rapid Communication of Recent Advances
- The Face-relief Strategy for Design of Profile Dies
