correlation of core and shell crystallinity with mechanical properties obtained by nanoindentation
Miroslav Huskić (Avtor), Lidija Slemenik Perše (Avtor), Boris Orel (Avtor), Mohor Mihelčič (Avtor)

Povzetek

This study investigates the correlation between the crystallinity and mechanical properties of calendered isotactic polypropylene (iPP) foils, focusing on the influence of haul-off speed and additive type. Two groups of iPP foils produced on an industrial scale were compared: (i) foils containing 10 wt.% recycled PP at haul-off speeds of 2 and 10 m/min; and (ii) foils with different additives (neat PP, 10 wt.% recycled PP, and PP ran- dom copolymer) at a constant haul-off speed of 10 m/min. All foils exhibited a pronounced skin–core structure, with the inner surface showing higher crystallinity (up to 10%) due to slower cooling rates, as determined by Flash Differential Scanning Calorimetry (Flash DSC). Nanoindentation tests correlated these differences in crystallinity with variations in the hardness and elastic modulus across the cross-section of the foil. Higher haul-off speeds (10 m/min) resulted in increased crystallinity, a higher elastic modulus and higher hardness. Polarized optical microscopy (POM) confirmed the morphological differences and highlighted the presence of highly oriented skin layers and stratified crystalline struc- tures. These findings emphasize the significant influence of processing conditions, such as hauling speed and the addition of recycled polypropylene or a random copolymer, on the mechanical and optical properties of iPP foils. This comprehensive approach to characterizing complex structure–property relationships is valuable for optimizing the production and performance of polypropylene-based packaging foils on an industrial scale.

Ključne besede

isotactic polypropylene (iPP);foils;calendering;flash differential scanning calorimetry (Flash DSC);nanoindentation;polarized optical microscopy;crystallinity;haze;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FS - Fakulteta za strojništvo
UDK: 621
COBISS: 229024771 Povezava se bo odprla v novem oknu
ISSN: 2073-4360
Št. ogledov: 87
Št. prenosov: 22
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: izotaktični polipropilen (iPP);folije;kalandriranje;hitra diferenčna dinamična kalorimetrija (Flash DSC);nanoindentacija;polarizacijska optična mikroskopija;kristaliničnost;motnost;
Strani: 18 str.
Letnik: ǂVol. ǂ17
Zvezek: ǂno. ǂ6, [article no.] 736
Čas izdaje: 2025
DOI: 10.3390/polym17060736
ID: 26057751
Priporočena dela:
, correlation of core and shell crystallinity with mechanical properties obtained by nanoindentation
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