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

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Title Design, syntheses, and characterization of new thermoplastic polyureas based on 3,4-ethylenedioxythiophene
 
Creator OJHA, UP
RAMESH, C
KUMAR, A
 
Subject phenylated aromatic polyureas
polymers
diamines
polyurethaneureas
terephthalamide)
polymerization
diisocyanates
efficient
catalyst
chain
3,4-ethylenedioxythiophene
heteroaromatic polymers
polyurea
polyurea gels
thermogravimetric analysis (tga)
thermoplastics
waxs
 
Description 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 .
 
Publisher JOHN WILEY & SONS INC
 
Date 2011-08-04T13:03:37Z
2011-12-26T12:54:44Z
2011-12-27T05:42:58Z
2011-08-04T13:03:37Z
2011-12-26T12:54:44Z
2011-12-27T05:42:58Z
2005
 
Type Article
 
Identifier JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 43(23), 5823-5830
0887-624X
http://dx.doi.org/10.1002/pola.21065
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9369
http://hdl.handle.net/10054/9369
 
Language en