01891nas a2200253   4500008004100000022001400041245009500055210006900150260008700219300001200306490000700318520100000325653001901325653001601344653000901360653002201369653001901391653001901410100002001429700002101449700002001470700001801490856012901508       2006                        eng d  a0892-705700aPreparation and performance evaluation of EPDM nanocomposites under accelerated weathering0 aPreparation and performance evaluation of EPDM nanocomposites un  a1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLANDbSAGE PUBLICATIONS LTDcSEP  a461-4740 v193 a<p>The degradability of ethylene propylene diene monomer (EPDM) nanocomposites, prepared from organically modified montmorillonite (CMMT), is studied under accelerated UV irradiation (lambda &gt;= 290 nm) for different time intervals. The development of functional groups during degradation is monitored by FT-IR spectroscopy whereas, surface changes are studied by scanning electron microscopy (SEM). The effect of clay modifier and clay concentration on the degradability are studied. The degradation of neat polymer and composites taking place traditionally and an increase in carbonyl and hydroxyl groups are observed with irradiation time. Neat EPDM is found to be less degradable than nanocomposites. Degradation products, as seen by FT-IR in nanocomposites are found to be the same as in neat polymer but are generated at a faster rate. According to the experimental results, one can define that both ammonium ion and neat montmorillonite (MMT) accelerate the photo-oxidation of EPDM.</p>10acarbonyl index10aDegradation10aEPDM10alayered silicates10aNanocomposites10aphotooxidation1 aRana, Sravendra1 aTevtia, Amit, K.1 aKumar, Bijendra1 aSingh, R., P.  uhttps://library.ncl.res.in/content/preparation-and-performance-evaluation-epdm-nanocomposites-under-accelerated-weathering-002067nas a2200277   4500008004100000022001400041245017900055210006900234260006700303300001400370490000800384520105500392653001101447653001501458653001601473653001301489100001601502700002601518700001801544700002101562700001801583700001701601700002101618700002301639856012701662       2013                        eng d  a0021-899500aCopolymerization of ethylene with unsaturated alcohols and methylmethacrylate using a silylated alpha-diimine nickel catalyst: molecular modeling and photodegradation studies0 aCopolymerization of ethylene with unsaturated alcohols and methy  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcAUG  a1820-18320 v1293 a<p>In this article, the experimental results obtained in the copolymerization of ethylene with polar monomers using a silylated -diimine nickel catalyst are described and compared with those obtained with a non-silylate similar one. The results show that the introduction of a siliyl group in the para-position of the imine moiety turns the catalyst less sensitive toward polar functionalities. However, the reactivity observed in copolymerization reactions was found to be reduced both the global polymerization and incorporation rates. Molecular modeling calculation allowed us to understand both the preferred insertion mode and the intermediate product structures for E/MMA copolymerization. Photodegradation studies showed that the presence of polar groups in the copolymers increases their rate of oxidation and turn them more easily degradable. The stabilization performed by Tinuvin 770 showed that for long-exposure times, it is not very effective regardless it is only mixed or grafted to the copolymer. (c) 2012 Wiley Periodicals, Inc.</p>10aageing10acopolymers10aDegradation10agrafting1 aMatos, Ines1 aFernandes, Susete, N.1 aLiu, Hua-Rong1 aTevtia, Amit, K.1 aSingh, R., P.1 aManda, Lemos1 aLemos, Francisco1 aMarques, Maria, M.  uhttps://library.ncl.res.in/content/copolymerization-ethylene-unsaturated-alcohols-and-methylmethacrylate-using-silylated-0