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- W1966388797 abstract "This paper is concerned with the effect of thermal history on the rheology of three liquid crystal copolymers. The polymers were heated to temperatures above their melting points and then cooled down. During the cooling cycle, the dynamic mechanical properties were monitored. It was found that these properties remained unchanged at temperatures as low as 30°C below the normal melting points for two copolyesters of 60 mole percent p-hydroxybenzoic acid (PHB) and 40 mole percent poly(ethylene terephthalate) (PET) (60-40 PHB/PET) and 80 mole percent PHB and 20 mole percent PET (80-20 PHB/PET). For a copolymer of PHB and 2,6-dihydroxynaphthaic acid, there was a gradual increase in the properties with decreasing temperature. However, at a critical temperature all three systems exhibit a sudden increase In dynamic mechanical properties. The kinetics of solidification were also monitored, and it was found that at temperatures well below the melting point, it took 4 to 6 min before the solidification process impeded flow. Extrusion studies on these materials were also carried out, and it was observed that in this supercooled state, the polymers exhibited significant die swell. The samples also exhibited a fibrous texture and were more oriented than when extruded isothermally above the melting point." @default.
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- W1966388797 date "1987-06-01" @default.
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- W1966388797 title "The effect of thermal history on the rheology and texture of thermotropic liquid crystalline polymers" @default.
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- W1966388797 doi "https://doi.org/10.1002/pen.760271108" @default.
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