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Title:Morphology of polypropylene/silica nano- and microcomposites
Authors:Pustak, Anđela (Author)
Pucić, Irina (Author)
Denac, Matjaž (Author)
Švab, Iztok (Author)
Pohleven, Janez (Author)
Musil, Vojko (Author)
Šmit, Ivan (Author)
Files:URL http://onlinelibrary.wiley.com/doi/10.1002/app.38487/pdf
Work type:Not categorized (r6)
Typology:1.01 - Original Scientific Article
Organization:EPF - Faculty of Business and Economics
Abstract:The aim of this study was to compare the effects of different silica grades on the structure and morphology of isotactic polypropylene (iPP)/silica composites to better understand their structure-property relationships. Isotactic polypropylene composites with 2, 4, 6, 8 vol % of added silica fillers differing in particle size (micro- vs. nanosilica) and surface modification (untreated vs. treated surface) were prepared by nonisothermal compression molding and characterized by different methods. The addition of all silica fillers grades to the iPP matrix significantly influenced the spherulitic morphology, while phase characteristics of the iPP matrix seemed to be unaffected. Surface modification of silica fillers exhibited stronger effects on spherulite size than size of silica particles. Nonpolar silica particles, more miscible or compatible with iPP chains than polar silica particles, enabled better spherulitic growth. The spherulite sizes tended to reach equal values at 8 vol % of added silicas showing that spherulite size became independent of filler concentration and surface modification above optimum filler concentration.
Keywords:polipropilen, mehanske lastnosti, strukturni odnosi, morfologija, kompoziti
Year of publishing:2013
Number of pages:str. 3099-3106
Numbering:Vol. 128, no. 5
ISSN on article:0021-8995
COBISS_ID:11340828 Link is opened in a new window
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Record is a part of a journal

Title:Journal of applied polymer science
Shortened title:J. appl. polym. sci.
COBISS.SI-ID:4730890 New window


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