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| - Optimizing Hydrogen-Bonding in Creating Miscible Liquid CrystallinePolymer Blends by Structural Modification of the Blend Components
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| - Our recent experimental results have shown that a miscible blend containing a liquidcrystalline polymer (LCP) and an amorphous copolymer, both capable of self-association and interassociation by hydrogen-bonding, can be created by slight structural modification of the amorphous polymer.The results also show that an optimum amount of intermolecular H-bonding can be formed in the blendby systematically varying the distance between the hydrogen-bonding groups on the copolymer chain. Itwas found that the system with the optimum amount of intermolecular hydrogen-bonding is also thesystem with the broadest miscibility window. In this paper, this work is extended by examining the effectof elimination of self-associating hydrogen bonds in the LCP on the intermolecular hydrogen-bondingand on the phase behavior of these blends. FTIR and phase behavior results show that this modificationresults in increased intermolecular hydrogen-bonding and a broader miscibility window than the blendthat contains the original liquid crystalline polymer. In agreement with our previous results, the optimumamount of intermolecular H-bonding is formed in the blend by systematically varying the distance betweenthe hydrogen-bonding groups on the amorphous copolymer. DSC and optical microscopy correlate thesedata to the blend phase behavior to show that the optimum amount of intermolecular hydrogen-bondingcorrelates to the system with the broadest miscibility window. Finally, thermodynamic analysis of theseblends provides insight and guidelines regarding the applicability of this scheme to create a miscibilitywindow in other polymer blends.
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