Thermal and X-Ray Investigation of a New Mesophasic Semiflexible Polyester

Emo Chiellini Dipartimento di Chimica e Chimica Industriale, Università di Pisa, 56126, Pisa, Italy

Giancarlo Galli Dipartimento di Chimica e Chimica Industriale, Università di Pisa, 56126, Pisa, Italy

Bin Yang Dipartimento di Scienze dei Materiali e della Terra, Università di Ancona, 60131, Italy

Oriano Francescangeli Dipartimento di Scienze dei Materiali e della Terra, Università di Ancona, 60131, Italy

Savino Melone Istituto di Fisica Medica, Università di Ancona, 60131, Italy

Annino Sante Angeloni Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, 40136, Bologna, Italy

Michele Laus Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, 40136, Bologna, Italy

Daniele Caretti Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, 40136, Bologna, Italy

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Abstract

A thermal and X-ray investigation is reported of a main-chain polyester consisting of two p-oxybenzoate diads alternatively spaced by a pentamethylene and an heptamethylene segment. Evidences are provided for the existence of an enantiotropic smectic C phase and a monotropic nematic phase. Cooling from the mesophase allows for the lock-in of the smectic C structure in the glassy state.

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Thermal and X-Ray Investigation of a New Mesophasic Semiflexible Polyester

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Thermal and X-Ray Investigation of a New Mesophasic Semiflexible Polyester

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