Aliphatic-aromatic co-polyureas have been prepared using 1,4-bis (isocyanatomethyl)-2,5-dimethylbenzene and 1,5-bis(isocyanatomethyl)-2,4-dimethylbenzene with various diamines. The polymers have been characterized by elemental analysis, TGA, DTA, IR, density and viscosity measurements. © 1989.

Venkatanarayana Mahadevan

AROMATIC POLYMERS--CHARACTERIZATION

POLYMERIZATION--CONDENSATION REACTIONS

ALIPHATIC AROMATIC COPOLYUREAS

BISISOCYANATOMETHYL DIMETHYLBENZENE

Diamines

Elemental analysis

Copolymers

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Synthetic studies on aliphatic-aromatic co-polyureas

European Polymer Journal

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. © 2005 Wiley Periodicals, Inc.

Journal of Polymer Science, Part A: Polymer Chemistry

Design, syntheses, and characterization of New thermoplastic polyureas based on 3,4-ethylenedioxythiophene

Chemischer Informationsdienst

ChemInform Abstract: Methoden der Organischen Chemie (Houben-Weyl). Organische Schwefelverbindungen.

Journal of Polymer Science: Polymer Chemistry Edition

Polycondensation of mono- and difunctional derivatives of p-xylene

Synthesis of polypropionamide-ureas from N-mesyloxysuccinimide and diamines

Synthesis of polyimides from N,N′-bis(phenylsulfonyl)pyromellitimide and aromatic diamines

Journal of Macromolecular Science, Part B

Infrared studies on segmented polyurethane-urea elastomers

Journal	European Polymer Journal
ISSN	00143057
Open Access	No