@article { ISI:000239688400001,
	title = {Preparation and performance evaluation of EPDM nanocomposites under accelerated weathering},
	journal = {Journal of Thermoplastic Composite Materials},
	volume = {19},
	number = {5},
	year = {2006},
	month = {SEP},
	pages = {461-474},
	publisher = {SAGE PUBLICATIONS LTD},
	type = {Article},
	address = {1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND},
	abstract = {<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>},
	keywords = {carbonyl index, Degradation, EPDM, layered silicates, Nanocomposites, photooxidation},
	issn = {0892-7057},
	doi = {10.1177/0892705706062204},
	author = {Rana, Sravendra and Tevtia, Amit K. and Kumar, Bijendra and Singh, R. P.}
}
@article { ISI:000319275700021,
	title = {Copolymerization of ethylene with unsaturated alcohols and methylmethacrylate using a silylated alpha-diimine nickel catalyst: molecular modeling and photodegradation studies},
	journal = {Journal of Applied Polymer Science},
	volume = {129},
	number = {4},
	year = {2013},
	month = {AUG},
	pages = {1820-1832},
	publisher = {WILEY-BLACKWELL},
	address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA},
	abstract = {<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>},
	keywords = {ageing, copolymers, Degradation, grafting},
	issn = {0021-8995},
	doi = {10.1002/app.38889},
	author = {Matos, Ines and Fernandes, Susete N. and Liu, Hua-Rong and Tevtia, Amit K. and Singh, R. P. and Manda, Lemos and Lemos, Francisco and Marques, Maria M.}
}
