Abstract
We have investigated the formation of nematic networks during thermally initiated crosslinking of liquid crystalline unsaturated copolyesters. Since it is not easy to follow the crosslinking over the whole range from zero to complete conversion of the double bonds by any other method, we studied the network formation by following the changes in specific volume of the polymer by PVT measurements. It is shown that in the range between 10 MPa and 30 MPa the rate of crosslinking is almost independent of pressure while an increase in temperature from 200°C to 240°C speeds up the reaction considerably. The increase in density of the polymer during crosslinking correlates with the decrease in double bonds detected by FTIR and the increase in gel content.
Published Version
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