02021nas a2200265   4500008004100000022001400041245011100055210006900166260006700235300001400302490000700316520110900323653000601432653002901438653002801467653001301495653001801508653003701526653001901563653000901582100001701591700001501608700001601623856011601639       2005                        eng d  a0887-624X00aDesign, syntheses, and characterization of new thermoplastic polyureas based on 3,4-ethylenedioxythiophene0 aDesign syntheses and characterization of new thermoplastic polyu  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcDEC  a5823-58300 v433 a<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>10a310a4-ethylenedioxythiophene10aheteroaromatic polymers10aPolyurea10apolyurea gels10aThermogravimetric analysis (TGA)10athermoplastics10aWAXS1 aOjha, U., P.1 aRamesh, C.1 aKumar, Anil  uhttps://library.ncl.res.in/content/design-syntheses-and-characterization-new-thermoplastic-polyureas-based-34-001973nas a2200217   4500008004100000022001400041245013300055210006900188260000800257520111800265653002301383653002301406653003701429653003301466653001901499100002601518700002501544700002801569700002701597856013101624       2024                        eng d  a0954-008300aAromatic (Co)polycarbonates bearing pendant norbornenyl groups: Synthesis, characterization and post-polymerization modification0 aAromatic Copolycarbonates bearing pendant norbornenyl groups Syn  cAUG3 a<p>
	A homo- and three co-polycarbonates (PC-NBs) bearing pendant norbornenyl groups were synthesized via solution polycondensation of triphosgene with 4, 4'-(bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) or various mol % compositions of BPA-NB and bisphenol-A, respectively. 1H-NMR spectroscopy confirmed the chemical structure and composition of PC-NBs. Inherent viscosity and number-average molecular weight (Mn) values of PC-NBs were in the range 0.44 - 0.64 dL g-1 and 21,800 - 34,100 g mol-1, respectively, indicating the formation of polymers of medium to reasonably high molecular weights. Tough, transparent, and flexible films of PC-NBs could be cast from chloroform solution. X-Ray diffraction studies indicated the amorphous nature of PC-NBs. Glass transition temperature (Tg) values, determined by DSC analysis, of PC-NBs were in the range 154 - 175 degrees C and Tg values increased with the increase in mol % of BPA-NB. The post-polymerization modification of a representative PC-NB was demonstrated using 3,6-diphenyl-1,2,4,5-tetrazine via tetrazine-ene reaction.</p>
10a(co)polycarbonates10anorbornenyl groups10apost-polymerization modification10atetrazine-ene click reaction10athermoplastics1 aTalanikar, Aniket, A.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S.  uhttps://library.ncl.res.in/content/aromatic-copolycarbonates-bearing-pendant-norbornenyl-groups-synthesis-characterization-and