@article { ISI:000243088200025,
	title = {Photooxidation of vulcanized EPDM/montmorillonite nanocomposites},
	journal = {Polymer Degradation and Stability},
	volume = {91},
	number = {12},
	year = {2006},
	month = {DEC},
	pages = {3033-3039},
	publisher = {ELSEVIER SCI LTD},
	type = {Article},
	address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND},
	abstract = {<p>The photooxidation of a vulcanized ethylene-propylene-diene monomer (EPDM)/montmorillonite nanocomposite as well as EPDM/nanocomposite with stabilizers was studied under accelerated UV-light irradiation (lambda \&gt;= 300 nm, 60 degrees C) for different times. The development of functional groups during oxidation was monitored by infrared spectroscopy. Photodegradation of the neat polymer and composites took place and the increases of absorbance in hydroxyl and carbonyl groups with irradiation times and also the decreases of the EPDM unsaturations were measured. The data indicated that the photooxidation products were not changed in the presence of the nanofiller. However, the presence of MMt was observed to dramatically enhance the rate of photooxidation of EPDM with a shortening of the oxidation induction time, leading to a decrease of the durability of the nanocomposites. On the other hand, it was observed that addition of stabilizers, either Tinuvin P or 2-mercaptobenzimidazole, was efficient in inhibiting the degradative effect of MMt. (c) 2006 Elsevier Ltd. All rights reserved.</p>},
	keywords = {EPDM, Nanocomposite, photooxidation rate, stabilization},
	issn = {0141-3910},
	doi = {10.1016/j.polymdegradstab.2006.08.026},
	author = {Morlat-Therias, Sandrine and Fanton, Elisabeth and Tomer, Namrata S. and Rana, Sravendra and Singh, R. P. and Gardette, Jean Luc}
}
@article { ISI:000239536200026,
	title = {Stabilization of gamma-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers},
	journal = {Polymer Degradation and Stability},
	volume = {91},
	number = {10},
	year = {2006},
	month = {OCT},
	pages = {2451-2464},
	publisher = {ELSEVIER SCI LTD},
	type = {Article},
	address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND},
	abstract = {<p>The stabilization of polyolefins against gamma-sterilization has been studied with single or binary additive system. The present attempt is to utilize synergistic mixtures of stabilizers which are approved for food contact applications. Ethylene-propylene (EP) copolymer has been melt-mixed with hindered amine stabilizers (HAS), phenolic antioxidants and organo-phosphites (hydroperoxide decomposer). Samples were sterilized with different doses of gamma-radiation. Stabilization was characterized in terms of changes in the functional groups (oxidation products), tensile properties, yellowing and surface morphology by FTIR spectroscopy, Instron, colorimetry (reflectance) and scanning electron microscopy (SEM), respectively. Results were discussed by comparing the stabilizing efficiency of mixtures with and without phenol system. Among phenol containing systems, where we mostly observe discoloration due to the oxidation of hindered phenol and the combination of secondary HAS, tertiary HAS, organo-phosphite and hindered phenol exhibited improved stabilization efficiency than single or binary additive systems. The mixture of secondary HAS and tertiary HAS, has shown antagonistic effect of stabilization whereas their combination with organo-phosphite has exhibited synergistic effect of stabilization even at higher doses of gamma-sterilization. The effects have been explained through the interaction between the stabilizers. (c) 2006 Elsevier Ltd. All rights reserved.</p>},
	keywords = {Antioxidants, discoloration, ethylene-propylene copolymer, gamma-sterilization, stabilization, tensile properties},
	issn = {0141-3910},
	doi = {10.1016/j.polymdegradstab.2006.03.010},
	author = {Alariqi, Sameh A. S. and Kumar, A. Pratheep and Rao, B. S. M. and Tevtia, Amit K. and Singh, R. P.}
}
