Thermo-mechanical properties of LLDPE/SiO2 nanocomposites

Kontou, E; Niaounakis, M

dc.contributor.author	Kontou, E	en
dc.contributor.author	Niaounakis, M	en
dc.date.accessioned	2014-03-01T01:25:23Z
dc.date.available	2014-03-01T01:25:23Z
dc.date.issued	2006	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17645
dc.subject	LLDPE	en
dc.subject	Nanocomposites	en
dc.subject	Silica	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Catalysts	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Silica	en
dc.subject.other	Thermomechanical treatment	en
dc.subject.other	Micromechanical models	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Nanofillers	en
dc.subject.other	Weight fraction	en
dc.subject.other	Linear low density polyethylenes	en
dc.subject.other	nanocomposite	en
dc.title	Thermo-mechanical properties of LLDPE/SiO2 nanocomposites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.polymer.2005.12.039	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.polymer.2005.12.039	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Two series of linear low density polyethylene (LLDPE)/SiO2 nanocomposites were prepared. They were based on two types of commercial LLDPE, one prepared by metallocene (mLLDPE) and the other by traditional Ziegler-Natta (zLLDPE) catalysts, and silica nanoparticles surface treated with dimethyldichlorosilane. The silica nanonparticles used have an average diameter of 16 run, and their weight fraction varied from 2 up to 10%. The structure and thermal-mechanical features of the nanocomposites were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dynamic mechanical spectroscopy (DMA) as well as tensile tests. The effect of nanoparticles on crystallinity, and hence to the morphology of the materials was studied. The secondary transitions were also affected by the filler presence, while the tensile properties were reinforced with varying the nanoparticle weight fraction. The addition of the nanofillers brought up an increase in the elastic modulus and the tensile strength of mLLDPE accompanied by an unusual dramatic increase in the elongation at break. The same trend, although to a lesser extent, was observed for the zLLDPE/SiO2 composites. The increment of the elastic modulus of the composites with increasing filler content was simulated with three micromechanical models developed in previous works. The model which assumes an effective interface between the matrix and the nanoparticles provided the best fitting with the experimental data of mLLDPE/SiO2. (c) 2005 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/j.polymer.2005.12.039	en
dc.identifier.isi	ISI:000235522900037	en
dc.identifier.volume	47	en
dc.identifier.issue	4	en
dc.identifier.spage	1267	en
dc.identifier.epage	1280	en