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- 1993 (2)
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- Composite (1)
- Gels-spun PE fibre (1)
- Liquid-crystalline polymer (1)
- Plasma treatment (1)
- Spectra 1000 (1)
Unidirectional composites of high-strength polyethylene fibres and epoxy resin matrix were continuously produced by a die drawing process. In order to increase the adhesion between fibre and matrix, the fibre surface was treated with a low-pressure oxygen plasma. Composites with fibre volume fractions up to 0.69 were obtained, their density being about 1.03g/cm^3. Composites of oxygen-treated fibres achieved the theoretical tensile strength.
Number-average molecular weights, M,, up to 25 OOO, and inherent viscosities, vinh, up to 2,88 dL/g, were found for the soluble members of an alkoxy-substituted copolyester series (HTO5-X series). A liquid-crystalline (high-temperature) phase was distinguished by IR and wide-angle Xray scattering on molten and quenched samples in form of a nematic sanidic phase. In this phase no relationship exists between the orientation of the aromatic polyester backbone and that of the laterally attached alkoxy groups. Further, it was proven by IR that only the polyester backbone can be aligned by shear stress. If the applied shear stress is very strong, the orientation of the stiff backbone becomes sensitive to disturbances caused by mechanical forces.
