TY - JOUR T1 - Design, syntheses, and characterization of new thermoplastic polyureas based on 3,4-ethylenedioxythiophene JF - Journal of Polymer Science Part A-Polymer Chemistry Y1 - 2005 A1 - Ojha, U. P. A1 - Ramesh, C. A1 - Kumar, Anil KW - 3 KW - 4-ethylenedioxythiophene KW - heteroaromatic polymers KW - Polyurea KW - polyurea gels KW - Thermogravimetric analysis (TGA) KW - thermoplastics KW - WAXS AB -

New thermoplastic polyureas labeled PUn (n = 2, 3, 4, 6, 7, 9, or 10), based on 3,4-ethylenedioxythiophene (EDOT) with flexible aliphatic spacers, were synthesized and characterized for the first time. EDOT was chosen as a replacement for the aromatic phenyl group in conventional thermoplastics based on urea linkages to improve solubility without compromising the thermal properties. As synthesized, all the samples exhibited a semicrystalline nature. The glass-transition and melting temperatures showed a strong dependence on the spacer length. A comparison of the thermal properties of these polyureas with the corresponding phenyl analogues indicated that EDOT was a viable heteroatomic analogue of the phenyl group to be inserted into the main-chain polyureas without hampering their thermal stability. The polyureas with spacer lengths greater than hexamethylene formed transparent gels in N-methylpyrrolidone, 1,1,2,2-tetrachloroethane, and dimethyl sulfoxide. The molecular packing of the polyureas was assigned with wide-angle X-ray diffraction studies. (c) 2005 Wiley Periodicals, Inc.

PB - WILEY-BLACKWELL CY - 111 RIVER ST, HOBOKEN 07030-5774, NJ USA VL - 43 IS - 23 U2 -

Council of Scientific & Industrial Research (CSIR) - India

U3 -

Foreign

U4 - 3.114 ER -