A new type of rigid rod polymer is reported, easily obtained by thermal cyclization of a soluble/ meltable polyamidic precursor. The polyamides are based on a diaminobenzodifurane monomer and are prepared by polycondensation reaction. The polymers are characterized by NMR, FTIR, GPC, TGA, DSC. The cyclization reaction produces insoluble/unmeltable benzodifuroxazinonic based polymers with rigid rod structure. Due to their thermotropic liquid crystalline behavior the polyamides are easily obtained from melt as oriented films under shear and as fibers by extrusion. High degree of orientation and smectic-like arrangement of polyamides are demonstrated by X-ray fiber diffraction. Retention of the orientation upon cyclization is demonstrated by XRFD, optical and electron microscopy.
Novel rigid rod polymers from a thermal cyclization reaction / Borbone, Fabio; Tarallo, Oreste; Roviello, Valentina; Caruso, Ugo; Pirozzi, Beniamino; Roviello, Antonio. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - 63:1(2015), pp. 80-89. [10.1016/j.eurpolymj.2014.12.022]
Novel rigid rod polymers from a thermal cyclization reaction
BORBONE, FABIO
;TARALLO, ORESTE;Roviello, Valentina;CARUSO, UGO;PIROZZI, BENIAMINO;ROVIELLO, ANTONIO
2015
Abstract
A new type of rigid rod polymer is reported, easily obtained by thermal cyclization of a soluble/ meltable polyamidic precursor. The polyamides are based on a diaminobenzodifurane monomer and are prepared by polycondensation reaction. The polymers are characterized by NMR, FTIR, GPC, TGA, DSC. The cyclization reaction produces insoluble/unmeltable benzodifuroxazinonic based polymers with rigid rod structure. Due to their thermotropic liquid crystalline behavior the polyamides are easily obtained from melt as oriented films under shear and as fibers by extrusion. High degree of orientation and smectic-like arrangement of polyamides are demonstrated by X-ray fiber diffraction. Retention of the orientation upon cyclization is demonstrated by XRFD, optical and electron microscopy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.