@article { ISI:000233391900008,
	title = {Design, syntheses, and characterization of new thermoplastic polyureas based on 3,4-ethylenedioxythiophene},
	journal = {Journal of Polymer Science Part A-Polymer Chemistry},
	volume = {43},
	number = {23},
	year = {2005},
	month = {DEC},
	pages = {5823-5830},
	publisher = {WILEY-BLACKWELL},
	type = {Article},
	address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA},
	abstract = {<p>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.</p>},
	keywords = {3, 4-ethylenedioxythiophene, heteroaromatic polymers, Polyurea, polyurea gels, Thermogravimetric analysis (TGA), thermoplastics, WAXS},
	issn = {0887-624X},
	doi = {10.1002/pola.21065},
	author = {Ojha, U. P. and Ramesh, C. and Kumar, Anil}
}
@article { ISI:000225953600006,
	title = {In situ polymerization of ethylene with bis(imino)pyridine iron(II) catalysts supported on clay: the synthesis and characterization of polyethylene-clay nanocomposites},
	journal = {Journal of Polymer Science Part A-Polymer Chemistry},
	volume = {43},
	number = {2},
	year = {2005},
	month = {JAN},
	pages = {304-318},
	publisher = {JOHN WILEY \& SONS INC},
	type = {Article},
	address = {111 RIVER ST, HOBOKEN, NJ 07030 USA},
	abstract = {<p>Polyethylene-clay nanocomposites were synthesized by in situ polymerization with 2,6-bis[1-(2,6-diisopropylphenylimino)ethyl] pyridine iron(II) dichloride supported on a modified montmorillonite clay pretreated with methylaluminoxane (MAO). The catalysts and the obtained nanocomposites were examined with wide-angle X-ray scattering. The exfoliation of the clay was further established by transmission electron microscopy. Upon the treatment of the clay with MAO, there was an increase in the d-spacing of the clay galleries. No further increase in the d-spacing of the galleries was observed with the iron catalyst supported on the MAO-treated clay. The catalyst activity for ethylene polymerization was independent of the Al/Fe ratio. The exfoliation of the clay inside the polymer matrix depended on various parameters, such as the clay content, catalyst content, and Al/Fe ratio. The crystallinity percentage and crystallite size of the nanocomposites were affected by the degree of exfoliation of the clay. Moreover, when ethylene was polymerized with a mixture of the homogeneous iron(II) catalyst and clay, the degree of exfoliation was significantly lower than when the polymerization was performed with a preformed clay-supported catalyst. This observation suggested that in the supported catalyst, at least some of the active centers resided within the galleries of the clay. (C) 2004 Wiley Periodicals, Inc.</p>},
	keywords = {clay, In situ polymerization, Nanocomposites, polyethylene (PE), TEM, WAXS},
	issn = {0887-624X},
	doi = {10.1002/pola.20502},
	author = {Ray, S and Galgali, G and Lele, Arundhati C. and Sivaram, S}
}
