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Effect of initial melting temperature on crystallization of polypropylene/organoclay nanocomposites

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dc.title Effect of initial melting temperature on crystallization of polypropylene/organoclay nanocomposites en
dc.contributor.author Svoboda (FT), Petr
dc.contributor.author Trivedi, Krunal
dc.contributor.author Svobodová, Dagmar
dc.contributor.author Mokrejš, Pavel
dc.contributor.author Kolomazník, Karel
dc.relation.ispartof Macromolecular Research
dc.identifier.issn 1598-5032 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2012
utb.relation.volume 20
utb.relation.issue 7
dc.citation.spage 659
dc.citation.epage 666
dc.type article
dc.language.iso en
dc.publisher Polymer Society of Korea en
dc.identifier.doi 10.1007/s13233-012-0096-0
dc.relation.uri http://www.springerlink.com/content/e0754u3285l70t28/
dc.subject polypropylene en
dc.subject nanocomposite en
dc.subject organoclay en
dc.subject intercalation en
dc.subject crystallization kinetics en
dc.description.abstract Polypropylene (PP) nanocomposites were prepared by melt intercalation using an intermeshing co-rotating twin-screw extruder. The influence of organoclay (Cloisite 20A) and maleic anhydride modified polypropylene (PP-MA) on various properties was explored. The effect of the initial melting temperature on crystallization kinetics was investigated by differential scanning calorimetry (DSC) and optical microscopy. DSC has revealed a gradual decrease in crystallization kinetics with an increase in initial melting temperature for two-component systems (PP/PP-MA and PP/20A). However, in the case of a three-component system (PP/PP-MA/20A), the decrease of crystallization kinetics in the range of initial melting temperature being 200-240 A degrees C was followed by an increase in the temperature range 240-260 A degrees C. After initial melting at 250 A degrees C, many spherulites were discovered in the three-component system. This unusual crystallization behavior was explained with the help of Fourier transform infrared spectroscopy (FTIR), where an increase in the Si-O peak with the increasing initial melting temperature was detected, which indicates the presence of large surface of clay layers. The morphology of nanocomposites was also investigated by transmission electron microscopy (TEM). The X-ray diffraction (XRD) analysis has revealed a decrease in the peak intensity with an increase in initial melting temperature, which suggests exfoliation caused by fast diffusion at high temperatures. en
utb.faculty Faculty of Technology
utb.faculty Faculty of Applied Informatics
utb.faculty Faculty of Humanities
dc.identifier.uri http://hdl.handle.net/10563/1002887
utb.identifier.rivid RIV/70883521:28110/12:43867995!RIV13-MSM-28110___
utb.identifier.rivid RIV/70883521:28140/12:43867995!RIV13-MSM-28140___
utb.identifier.rivid RIV/70883521:28150/12:43867995!RIV13-MSM-28150___
utb.identifier.obdid 43868086
utb.identifier.scopus 2-s2.0-84864578532
utb.identifier.wok 000305236400001
utb.source j-wok
dc.date.accessioned 2012-07-11T11:41:51Z
dc.date.available 2012-07-11T11:41:51Z
utb.contributor.internalauthor Svoboda (FT), Petr
utb.contributor.internalauthor Trivedi, Krunal
utb.contributor.internalauthor Svobodová, Dagmar
utb.contributor.internalauthor Mokrejš, Pavel
utb.contributor.internalauthor Kolomazník, Karel
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