Thermal transitions of polypropylene in blends and composites with polypyrrole and polypyrrole/montmorillonite

Kripotou, S; Apekis, L; Rapti, C; Vartzeli-Nikaki, K; Pissis, P; Mravckova, M; Omastova, M

dc.contributor.author	Kripotou, S	en
dc.contributor.author	Apekis, L	en
dc.contributor.author	Rapti, C	en
dc.contributor.author	Vartzeli-Nikaki, K	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Mravckova, M	en
dc.contributor.author	Omastova, M	en
dc.date.accessioned	2014-03-01T02:44:59Z
dc.date.available	2014-03-01T02:44:59Z
dc.date.issued	2007	en
dc.identifier.issn	00914037	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32070
dc.subject	Crystallization rate	en
dc.subject	Differential scanning calorimetry	en
dc.subject	Montmorillonite	en
dc.subject	Polypropylene	en
dc.subject	Polypyrrole	en
dc.subject.other	Compression molding	en
dc.subject.other	Crystallization	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Polypropylenes	en
dc.subject.other	Polypyrroles	en
dc.subject.other	Thermal effects	en
dc.subject.other	Composites crystallization	en
dc.subject.other	Crystallization rate	en
dc.subject.other	Montmorillonites	en
dc.subject.other	Thermal transitions	en
dc.subject.other	Polymer blends	en
dc.title	Thermal transitions of polypropylene in blends and composites with polypyrrole and polypyrrole/montmorillonite	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1080/00914030701377774	en
heal.identifier.secondary	http://dx.doi.org/10.1080/00914030701377774	en
heal.publicationDate	2007	en
heal.abstract	Thermal transitions of the semi-crystalline isotactic polypropylene, in polypropylene/polypyrrole blends and polypropylene/polypyrrole/montmorillonite composites, processed by two different ways, were investigated by differential scanning calorimetry. Glass transition temperature of polypropylene was found to remain unchanged at 269K, whereas the crystallization rate was found to be higher in the blends and composites, which is explained in terms of increased concentration of extrinsic crystallization nuclei. The effect is larger in the materials processed by mixing and subsequent compression molding as compared to the materials prepared directly by compression molding. The degree of crystallinity of polypropylene did not show any systematic variation with composition, whereas it is slightly higher for the samples prepared by direct compression molding, being in the range of 50-59%. The polypropylene in the blends and the composites crystallizes in the stable form, whereas metastable crystallites of the form were observed as a minor component, depending on the thermal history of the samples. The results are discussed on the basis of the picture emerging from morphological studies.	en
heal.journalName	International Journal of Polymeric Materials	en
dc.identifier.doi	10.1080/00914030701377774	en
dc.identifier.volume	56	en
dc.identifier.issue	8	en
dc.identifier.spage	865	en
dc.identifier.epage	884	en