Evolution of surface free energy during thin-film polymerization of main-chain liquid crystalline polymers

Article Abstract:

Research was conducted to examine the time evolution of surface free energy during thin-film polymerization of main-chain liquid crystalline polymers using a novel thin-film polymerization method and the Lifshitz-van der Waals acid-base theory. Through the use of a Rame-Hart goniometer and water, glycerol and diiodomethane, the surface free-energy components of the main-chain liquid crystalline copolyesters and homopolyesters were measured. Results indicate that the wholly aromatic main-chain liquid crystalline polymer has a monopolar Lewis base character.

Thin films, Crystalline polymers, Gibbs' free energy

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Surface microcracks decoration and disclination defects of wholly aromatic liquid crystalline copolyesters

Article Abstract:

A study aims to examine in detail the surface microcracks decoration of para-(ABA/MH/TFTA) and meta-linked (ABA/MH/TFIA) copolyesters using a polarizing light microscope (PLM). It is concluded that both ABA/MH/TFTA (para) and ABA/MH/TFIA (meta) films form surface microcracks decoration in nematic-mosaic texture during a rapid quenching.

All Other Basic Organic Chemical Manufacturing, Esters, Salts & Halides NEC, Polymer liquid crystals, Liquid crystalline polymers, Esters, Atomic properties

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Effect of -C(CF3)(sub 2)- on the surface energy of main-chain liquid crystalline and crystalline polymers

Article Abstract:

Novel fluorinated main-chain liquid crystalline/crystalline polymers are prepared with the help of thin film polymerization. A small amount of C(CF3)(sub 2) in the main chain lowered the surface energy and the fluorocarbons are enriched at the air-polymer interface, causing low surface energy and large water contact angles.

Carbon, Thermal properties, Addition polymerization

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