01837nas a2200205   4500008004100000022001400041245011100055210006900166260005700235300001200292490000700304520105400311653002801365653002601393653002201419653001801441100002501459700002001484856012701504       2009                        eng d  a1598-503200aThermally induced cationic polymerization of glycidyl phenyl ether using novel xanthenyl phosphonium salts0 aThermally induced cationic polymerization of glycidyl phenyl eth  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcAPR  a221-2260 v173 a<p>The present study firstly describes the synthesis of novel, thermo-latent initiators based on xanthenyl phosphonium salts with different counter anions and phosphine moieties and secondly examines their efficiency in the bulk polymerization of glycidyl phenyl ether (GPE). The polymerization was performed with phosphonium salt initiators (I(SbF6), I(PF6), I(AsF6) and I(BF4)) at ambient temperature to 200 degrees C for 1 h. The order of initiator activity was I(SbF6) &gt; I(PF6) &gt; I(AsF6) &gt; I(BF4). To examine the effect of the phosphine moiety on the initiator activity, polymerization was carried out with I(SbF6) (Ph(3)P) and II(SbF6) (Bu(3)P) at ambient temperature to 170 degrees C for 1 h. The order of reactivity was I(SbF6) &gt; II(SbF6). In general, the conversion percentage increased with increasing polymerization temperature. The thermal stability of these salts was measured by then-no gravimetric analysis (TGA). The solubility of phosphonium salts in various organic solvents and epoxy monomers was also investigated.</p>10aCationic polymerization10aglycidyl phenyl ether10aphosphonium salts10athermo-latent1 aGupta, Mukesh, Kumar1 aSingh, Raj, Pal  uhttps://library.ncl.res.in/content/thermally-induced-cationic-polymerization-glycidyl-phenyl-ether-using-novel-xanthenyl-002070nas a2200193   4500008004100000022001400041245011500055210006900170260006700239300001400306490000700320520131000327100002201637700002201659700002001681700002401701700002001725856013101745       2012                        eng d  a0032-388800aThermal, mechanical, and rheological characterization of polypropylene/layered double hydroxide nanocomposites0 aThermal mechanical and rheological characterization of polypropy  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcSEP  a2006-20140 v523 a<p>Polypropylene (PP)/organomodified layered double hydroxide (LDH) nanocomposites were prepared in order to examine the influence of LDH content on thermal, mechanical, and rheological properties. The nanostructure examinations by X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the exfoliated/intercalated dispersion of LDH. Incorporation of the LDH resulted in a noteworthy improvement in the thermal stability of PP. It was shown that the addition of LDH contributed to the reinforcement effect by increasing the elastic modulus. The mechanical performance, as evaluated by stressstrain curves, reveal that PP/LDH hybrid materials showed significant contribution toward increment in elastic modulus, tensile strength but at the expense of impact strength. The rheological response showed a strong influence of LDH particles on the flow behavior of the PP/LDH melt which resulted in enhancement of storage, loss of moduli, and complex viscosity of nanocomposites. Therefore, the nanocomposites have higher moduli but better processibility compared with pure PP. Overall, the results indicated that the LDH particles in nanometer size might act as potential reinforcing agent for polypropylene. POLYM. ENG. SCI., 52:20062014, 2012. (c) 2012 Society of Plastics Engineers</p>1 aLonkar, Sunil, P.1 aTherias, Sandrine1 aLeroux, Fabrice1 aGardette, Jean, Luc1 aSingh, Raj, Pal  uhttps://library.ncl.res.in/content/thermal-mechanical-and-rheological-characterization-polypropylenelayered-double-hydroxide-0