Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
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Changyeol Ryu
Abstract
As a part of continuous study to search for the high performance in situ composite, this study examines the miscibility of liquid crystalline poly(ester imide) (PEsI) with poly(ether imide) (PEI) and its effect on the mechanical properties and the morphology of the blends of these polymers. Liquid crystalline polymers (LCPs) were synthesized from trimellitic anhydride and α,ω-diaminoalkane with 8, 10, 12 methylene groups. Thermal condensation of these diacids with 4,4′-diacetoxybiphenyl yielded the corresponding imides of thermotropic homopolyesters. Optical polarized micrographs show that the synthesized poly(ester imides) have the smectic structure. Partial miscibility was observed from the shift of the glass transition temperature determined by differential scanning calorimetry. Increasing concentration of the liquid crystalline PEsI in the PEI/PEsI blends shifted the glass transition temperature of the PEI phase to a lower temperature. Mechanical properties of the PEI/PEsI blends were changed with the number of methylene units in PEsI. Morphologies of the partially miscible system were found to be quite different from those of an immiscible system. Strong adhesion between the matrix (PEI) and dispersed phase (LCP) was observed, but fine fibril formation was not possible due to the absence of smectic-nematic transition.
© 1994, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Tenth in a Series: Fried. Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 1. Essen, Magdeburg and Harburg (1812–1960)
- Internal Mixers
- Finite Element Modelling of Non-isothermal Viscometric Flows in Rubber Mixing
- Screw Extrusion and Mixing
- The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
- Morphological Changes of a Polymer Blend into a Twin-Screw Extruder
- An In-line Melt Rheometer for Molten Plastics
- Selecting Continuous Compounding Equipment Based on Process Considerations
- Reactive Processing
- Peroxide Induced and Thermal Degradation of Polypropylene
- Reactive Blending of Polyamide 6 and Polycarbonate
- Modification of Polypropylene by Maleic Anhydride
- Fibers and Films
- Melt Strength Behaviour of Polypropylenes
- Molding
- Multilayer Injection Moulding
- Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
- The Effects of Recycling and Degradation on Parison Extrusion
- Modeling and Simulation of High Reynolds' Number Flows During Reaction Injection Mold Filling
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Tenth in a Series: Fried. Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 1. Essen, Magdeburg and Harburg (1812–1960)
- Internal Mixers
- Finite Element Modelling of Non-isothermal Viscometric Flows in Rubber Mixing
- Screw Extrusion and Mixing
- The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
- Morphological Changes of a Polymer Blend into a Twin-Screw Extruder
- An In-line Melt Rheometer for Molten Plastics
- Selecting Continuous Compounding Equipment Based on Process Considerations
- Reactive Processing
- Peroxide Induced and Thermal Degradation of Polypropylene
- Reactive Blending of Polyamide 6 and Polycarbonate
- Modification of Polypropylene by Maleic Anhydride
- Fibers and Films
- Melt Strength Behaviour of Polypropylenes
- Molding
- Multilayer Injection Moulding
- Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
- The Effects of Recycling and Degradation on Parison Extrusion
- Modeling and Simulation of High Reynolds' Number Flows During Reaction Injection Mold Filling
