01638nas a2200241 4500008004100000022001400041245017900055210006900234260006800303300001200371490000700383520068300390653001801073653002001091653002101111653002001132653002701152653000801179653002401187100002901211700002501240856013101265 2007 eng d a0887-624X00aSynthesis and characterization of poly(higher-alpha-olefin)s with a nickel(alpha-diimine)/methylaluminoxane catalyst system: effect of chain running on the polymer properties0 aSynthesis and characterization of polyhigheralphaolefins with a  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcJAN a191-2100 v453 a

Homopolymerization of octadecene-1 at different reaction conditions has been studied. Significant chain running can be seen at higher polymerization temperatures. Interestingly, insertion of octadecene-1 into a sterically hindered nickel-cation/carbon (secondary) bond is observed. The microstructure of the polymer was established using NMR spectroscopy. The effects of chain running on polymer melting, crystallization behavior, and dynamic mechanical thermal properties were studied using DSC and DMTA. The extent of chain running (i.e., 2 omega-, 1,omega-enchainments) decreases with an increase in the carbon number of alpha-olefins. (c) 2006 Wiley Periodicals, Inc.

10achain running10aCrystallization10aglass transition10amelt transition10anickel (alpha-diimine)10aNMR10apoly(alpha-olefin)s1 aSubramanyam, Ummadisetty1 aSivaram, Swaminathan uhttp://library.ncl.res.in/content/synthesis-and-characterization-polyhigher-alpha-olefins-nickelalpha-diiminemethylaluminoxane01949nas a2200205 4500008004100000022001400041245012400055210006900179260007700248300001200325490000800337520113500345653002001480653002101500653002601521653002901547100002001576700001901596856012801615 2008 eng d a1022-136000aStudies on the effect of glass transition on the crystalline transition in syndiotactic polystyrene - solvent complexes0 aStudies on the effect of glass transition on the crystalline tra aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcNOV a109-1140 v2733 a

Amorphous syndiotactic polystyrene (sPS) was crystallized at room temperature in Norbornadiene (bicyclo[2,2,1]-hepta-2,5-diene), Mesitylene (1,3,5-Trimethyl benzene), 3-Carene (3,7,7-trimethyl bicyclo[4,1,0]hept-3-ene) and DMN (1,4-Dimethylnaphthalene) to form the sPS-solvent complex (h form) with respective solvent molecules. In situ HTFTIR studies showed that the delta form to gamma form transformation temperature occurs well below the glass transition temperature of sPS, which is depressed due to the presence of solvent in the amorphous phase; higher the solvent content in the complex, lower the transition temperature. Glass transition temperatures determined by Modulated differential scanning calorimetry (MDSC) coincide with the transition temperatures, indicating that the delta form transforms into gamma form at the glass transition temperature for these complexes. Such a behavior is very different from the behaviour of the sPS- solvent complexes formed by dichloromethane, chloroform, toluene, o-dichlorobenzene, decalin (cis-trans) etc. and for these complexes the transition occur well above the T(g).

10aCrystallization10aglass transition10ainfrared spectroscopy10aSyndiotactic polystyrene1 aNaidu, Sudhakar1 aRamesh, N., C. uhttp://library.ncl.res.in/content/studies-effect-glass-transition-crystalline-transition-syndiotactic-polystyrene-solvent-002116nas a2200217 4500008004100000022001400041245008500055210006900140260006700209300001200276490000700288520132500295653001701620653002101637653003801658100002501696700002401721700001801745700001701763856011801780 2015 eng d a0887-624X00aIonic conductivity probed in main chain liquid crystalline azobenzene polyesters0 aIonic conductivity probed in main chain liquid crystalline azobe a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcMAR a629-6410 v533 a

Three main chain thermotropic liquid crystalline (LC) azobenzene polymers were synthesized using the azobenzene twin molecule (P4P) having the structure Phenylazobenzene-tetraethyleneglycol-Phenylazobenzene as the AA monomer and diols like diethylene glycol, tetraethylene glycol (TEG), and hexaethylene glycol as the BB comonomer. Terminal C(O)OMe units on P4P facilitated transesterification with diols to form polyesters. All polymers exhibited stable smectic mesophases. One of the polymers, Poly(P4PTEG) was chosen to prepare composite polymer electrolytes with LiCF3SO3 and ionic conductivity was measured by ac impedance spectroscopy. The polymer/0.3 Li salt complex exhibited a maximum ionic conductivity in the range of 10(-5) S cm(-1) at room temperature (25 degrees C), which increased to 10(-4) S cm(-1) above 65 degrees C. The temperature dependence of ionic conductivity was compared with the phase transitions occurring in the sample and it was observed that the glass transition had a higher influence on the ionic conductivity compared to the ordered LC phase. Reversible ionic conductivity switching was observed upon irradiation of the polymer/0.3 Li salt complex with alternate UV and visible irradiation. (c) 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 629-641

10aazo polymers10aglass transition10aliquid-crystalline polymers (LCP)1 aNardele, Chinmay, G.1 aDhavale, Vishal, M.1 aSreekumar, K.1 aAsha, S., K. uhttp://library.ncl.res.in/content/ionic-conductivity-probed-main-chain-liquid-crystalline-azobenzene-polyesters-001917nas a2200205 4500008004100000022001400041245007300055210006900128260006700197300001000264490000800274520119700282653001501479653001701494653002101511100002501532700002301557700002501580856010601605 2016 eng d a0021-899500aToughening of epoxy novolac resin using cardanol based flexibilizers0 aToughening of epoxy novolac resin using cardanol based flexibili a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcAPR a433180 v1333 a

In this work, two different cardanol based epoxies (Cardolite NC-514 and Cardanol NC-547) were employed as flexibilizers to toughen an epoxy novolac resin namely, poly[(phenylglycidyl ether)-co-formaldehyde] (PPGEF). 4,4-Diamino-3,3-dimethyl dicyclohexyl methane (BMCHA) was used as a curing agent. Differential scanning calorimetry and dynamic mechanical thermal analysis of the composites showed a gradual decrease in glass transition temperatures (T-g) with increase in cardolite content confirming the incorporation of flexible moieties into the brittle resin matrix. Improvement in toughening of PPGEF/Cardolite composites was manifested by increase in the izod impact strength of both the composites. The tensile strength increased marginally for composites with increasing amount of Cardolite NC-514 but decreased for the composites containing Cardolite NC-547. This was attributed to the lack of rotational motion in the chain due to close proximity of rigid phenyl rings in NC-547. SEM of the cryo-fractured surfaces of composites showed good compatibility between PPGEF and cardanol based flexibilizers. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43318.

10acomposites10acrosslinking10aglass transition1 aGour, Rajeshwari, S.1 aKodgire, Vivek, V.1 aBadiger, Manohar, V. uhttp://library.ncl.res.in/content/toughening-epoxy-novolac-resin-using-cardanol-based-flexibilizers-1