Comparative study of PLA nanocomposites reinforced with clay and silica nanofillers and their mixtures

Kontou, E; Niaounakis, M; Georgiopoulos, P

dc.contributor.author	Kontou, E	en
dc.contributor.author	Niaounakis, M	en
dc.contributor.author	Georgiopoulos, P	en
dc.date.accessioned	2014-03-01T01:35:25Z
dc.date.available	2014-03-01T01:35:25Z
dc.date.issued	2011	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21043
dc.subject	aggregates	en
dc.subject	biodegradable	en
dc.subject	interfaces	en
dc.subject	nanocomposites	en
dc.subject	polylactide	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Aggregation effects	en
dc.subject.other	Best fit	en
dc.subject.other	biodegradable	en
dc.subject.other	Comparative studies	en
dc.subject.other	Detrimental effects	en
dc.subject.other	Experimental techniques	en
dc.subject.other	Interphase effect	en
dc.subject.other	Micro mechanics model	en
dc.subject.other	Nano-fillers	en
dc.subject.other	Nano-sized fillers	en
dc.subject.other	Nanofiller	en
dc.subject.other	polylactide	en
dc.subject.other	Polylactides	en
dc.subject.other	Surface area	en
dc.subject.other	Tensile measurements	en
dc.subject.other	Thermomechanical properties	en
dc.subject.other	Toughening effects	en
dc.subject.other	Weight fractions	en
dc.subject.other	Wide-angle X-ray scattering	en
dc.subject.other	Young's Modulus	en
dc.subject.other	Agglomeration	en
dc.subject.other	Clay minerals	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Dynamic analysis	en
dc.subject.other	Dynamic mechanical analysis	en
dc.subject.other	Interfaces (materials)	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Silica	en
dc.subject.other	Thermogravimetric analysis	en
dc.title	Comparative study of PLA nanocomposites reinforced with clay and silica nanofillers and their mixtures	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.34234	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.34234	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	This study compares the effects of two different types of nanosized fillers (silica and montmorillonite) at three different weight fractions as well their mixtures on the thermomechanical properties of polylactide (PLA). The role of aggregation and interphase was investigated in terms of several experimental techniques, including scanning electron microscopy, wide-angle X-ray scattering (WAXS), thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis (DMA), and tensile measurements. The experimental results clearly suggest that silica and montmorillonite have different reinforcing and toughening effects on PLA, while the combination of the two different nanofillers has a detrimental effect on the tensile properties of the material. Four micromechanics models describing the Young's modulus of the nanocomposites were used to study the different matrix-nanofiller interactions. The best fit of the experimental results was obtained with a model that assumes the presence of an interphase surrounding each nanoparticle. The increase of the nanofiller content above a certain amount was not accompanied by a corresponding increase of the interphase, because the total nanofiller surface area was counterbalanced by the creation of aggregates. It is postulated that the aggregation effect acts antagonistically to the interphase effect. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 1519-1529, 2011	en
heal.publisher	WILEY-BLACKWELL	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.34234	en
dc.identifier.isi	ISI:000293849200007	en
dc.identifier.volume	122	en
dc.identifier.issue	3	en
dc.identifier.spage	1519	en
dc.identifier.epage	1529	en