01687nas a2200265   4500008004100000022001400041245012000055210006900175260008600244300001400330490000800344520071500352653002701067653002101094653001901115100002601134700002001160700001901180700001801199700001301217700002201230700002301252700001801275856012801293       2005                        eng d  a1060-132500aPhotodegradation of ethylene/propylene/polar monomers co- and terpolymers. I - Prepared by group 4 catalyst systems0 aPhotodegradation of ethylenepropylenepolar monomers co and terpo  a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcSEP  a1259-12700 vA423 a<p>The photooxidative degradation behavior of polyethylene, its copolymers (propylene/polar monomers) and terpolymers, synthesized by a group 4 catalyst system, has been studied by Fourier transform infrared spectroscopy and confirmed with scanning elecrton microscopy for morphological changes. The kinetics of photodegradation has also been studied. Surface damage caused by polychromatic (&gt;= 290 nm) at 55 degrees C in air is presented in different micrographs. The rate of photodegradation is very fast in terpolymers containing polar monomers as compared with copolymers and polyethylene. Morphological study of these photodegraded samples showed a very good relation with photodegradation results.</p>10afunctional polyolefins10aPhotodegradation10aUV irradiation1 aFernandes, Susete, N.1 aCorreia, Sandra1 aPrasad, A., V.1 aReddy, K., R.1 aRana, S.1 aLonkar, Sunil, P.1 aMarques, Maria, M.1 aSingh, R., P.  uhttps://library.ncl.res.in/content/photodegradation-ethylenepropylenepolar-monomers-co-and-terpolymers-i-prepared-group-4-002388nas a2200193   4500008004100000022001400041245010900055210006900164260009800233300001200331490000700343520154600350653003701896653006701933100002202000700002002022700002002042856013202062       2007                        eng d  a1042-714700aPhoto-stabilization of EPDM-clay nanocomposites: effect of antioxidant on the preparation and durability0 aPhotostabilization of EPDMclay nanocomposites effect of antioxid  aTHE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLANDbJOHN WILEY & SONS LTDcNOV  a891-9000 v183 a<p>The present study is to examine the photo-stabilization effect of an antioxidant on the photo-oxidation of ethylene-propylene-diene monomer (EPDM)-clay nanocomposites. During the preparation of EPDM-clay nanocomposites via melt processing antioxidants are usually incorporated along with clay, which allows phenolic antioxidant molecules to get adsorbed onto acidic clay platelets and their interaction with metallic impurities reduces the stabilizing efficiency of the antioxidant. The nanocomposites were obtained by solution dispersion followed by melt compounding of EPDM and organophilic montmorillonite (OMMT). The samples were characterized by conventional tools such as X-ray diffraction (XRD), Fourier Transform Infra Red (FT-IR) spectroscopy, and thermo-gravimetric analysis (TGA). It was found, upon photo-irradiation (lambda &gt; 290 nm) studies by following the changes in functional groups and surface morphology, that photo-degradation was lowered by the antioxidant and the efficiency of the antioxidant could be improved by initial incorporation of antioxidant in the EPDM matrix. In EPDM-clay nanocomposites, a stabilizing activity of the antioxidant was observed above some threshold concentration of the antioxidant. The relationship between the nanoclay reinforcement and stabilizing efficiency in terms of photo-oxidation and surface morphology for their applicability are discussed. The methodology adopted for this study is also justified through our observation. Copyright (C) 2007 John Wiley &amp; Sons, Ltd.</p>10aethylene-propylene-diene monomer10ananocomposites photo-degradation antioxidant and stabilization1 aLonkar, Sunil, P.1 aKumar, Pratheep1 aSingh, Raj, Pal  uhttps://library.ncl.res.in/content/photo-stabilization-epdm-clay-nanocomposites-effect-antioxidant-preparation-and-durability-002692nas a2200241   4500008004100000022001400041245011600055210006900171260009900240300001400339490000700353520173200360653002902092653004302121653003302164100002202197700002902219700001602248700002002264700002402284700001802308856012402326       2009                        eng d  a0032-386100aPreparation and nonisothermal crystallization behavior of polypropylene/layered double hydroxide nanocomposites0 aPreparation and nonisothermal crystallization behavior of polypr  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcMAR  a1505-15150 v503 a<p>Polypropylene (PP)/layered double hydroxide (LDH) nanocomposites were prepared via melt intercalation using dodecyl sulfate anion modified LDH and maleated PP as compatibilizing agent. Evidently the interlayer anions in LDH galleries react with maleic anhydride groups of PP-g-MA and lead to a finer dispersion of individual LDH layers in the PP matrix. The nanostructure was characterized by XRD and TEM; the examinations confirmed the nanocomposite formation with exfoliated/intercalated layered double hydroxides well distributed in the PP matrix. The nonisothermal crystallization behavior of resulting nanocomposites was extensively studied using differential scanning calorimetry (DSC) technique at various cooling rates. In nonisothermal crystallization kinetics, the Ozawa approach failed to describe the crystallization behavior of nanocomposites, whereas the Avrami analysis and Jeziorny method well define the crystallization behavior of PP/LDH nanocomposite. Combined Avrami and Ozawa analysis (Liu model) also found useful. The results revealed that very small amounts of LDH (1%) could accelerate the crystallization process relative to the pure PP and increase in the crystallization rates was attributed to the nucleating effect of the nanoparticles. Polarized optical microscopy (POM) observations also support the DSC results. The effective crystallization activation energy was estimated as a function of the relative degree of crystallinity using the isoconversional analysis. Overall, results indicated that the LDH particles in nanometer size might act as nucleating agent and distinctly change the type of nucleation, growth and geometry of PP crystals. (C) 2009 Elsevier Ltd. All rights reserved.</p>10aLayered double hydroxide10aNonisothermal crystallization kinetics10aPolypropylene nanocomposites1 aLonkar, Sunil, P.1 aMorlat-Therias, Sandrine1 aCaperaa, N.1 aLeroux, Fabrice1 aGardette, Jean, Luc1 aSingh, R., P.  uhttps://library.ncl.res.in/content/preparation-and-nonisothermal-crystallization-behavior-polypropylenelayered-double-0