Catalytic degradation of polyethylene : an evaluation of the effect of dealuminated Y Zeolites using thermal analysis

doi:10.1016/j.matchemphys.2007.02.032

Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/13286

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Campo DC	Valor	Idioma
dc.contributor.author	Neves, I. C.	-
dc.contributor.author	Botelho, Gabriela	-
dc.contributor.author	Machado, A. V.	-
dc.contributor.author	Rebelo, P.	-
dc.date.accessioned	2011-08-04T14:07:44Z	-
dc.date.available	2011-08-04T14:07:44Z	-
dc.date.issued	2007	-
dc.identifier.issn	0254-0584	por
dc.identifier.uri	https://hdl.handle.net/1822/13286	-
dc.description.abstract	Commercial samples of high density polyethylene were degraded overYzeolites with different Si/Al: ultrastableYzeolite (USY) and three dealuminated Yzeolites (HY(4), HY(12) and HY(20)). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC)was used aiming to evaluate the apparent activation energy of polymer cracking. The results obtained showthat the efficiency of different zeoliteswas due to their acidity. Ahigh Si/Al ratio gave a greater acidity to zeolites and the onset degradation temperature of the polymer and related activation energy decreased. The sample residues obtained after an isothermic TGA, were analysed by DSC and it was observed that the crystallinity decreases with the acidity of zeolites. HY(20) zeolite was the most active catalyst due to the isolation of the residual Brønsted acid sites which promote their strong acidity.	por
dc.language.iso	eng	por
dc.publisher	Elsevier Science SA	por
dc.rights	restrictedAccess	por
dc.subject	Polymer	por
dc.subject	Microporous materials	por
dc.subject	Ageing	por
dc.subject	Thermogravimetric analysis	por
dc.title	Catalytic degradation of polyethylene : an evaluation of the effect of dealuminated Y Zeolites using thermal analysis	por
dc.type	article	-
dc.peerreviewed	yes	por
oaire.citationStartPage	5	por
oaire.citationEndPage	9	por
oaire.citationIssue	1	por
oaire.citationTitle	Materials Chemistry and Physics	por
oaire.citationVolume	104	por
dc.identifier.doi	10.1016/j.matchemphys.2007.02.032	por
dc.subject.wos	Science & Technology	por
sdum.journal	Materials Chemistry and Physics	por
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