TY - GEN
T1 - Effect of cooling rate on the crystal polymorphism in beta-nucleated isotactic polypropylene as revealed by a combined WAXS/FSC analysis
AU - Rhoades, Alicyn Marie
AU - Wonderling, Nichole
AU - Gohn, Anne
AU - Williams, Jason
AU - Mileva, Daniela
AU - Gahleitner, Markus
AU - Androsch, René
N1 - Publisher Copyright:
© 2016 Author(s).
PY - 2016/5/18
Y1 - 2016/5/18
N2 - The efficiency of γ-quinacridone to nucleate β-crystal formation in isotactic polypropylene (iPP) at rapid cooling has been evaluated by a combination of fast scanning chip calorimetry (FSC) and wide-angle X-ray scattering (WAXS). For samples with different amount of γ-quinacridone, FSC experiments revealed information about a critical cooling rate above which the crystallization temperature decreases to below 105 °C, that is, to temperatures at which the growth rate of α-crystals is higher than that of β-crystals. Microfocus WAXS analysis was then applied to gain information about the competition of formation of β- and α-crystals in samples prepared at defined cooling conditions at rates up to 1000 K/s in the FSC. For iPP containing 1 and 500 ppm γ-quinacridone, the crystallization temperature is lower than 105 °C on cooling faster about 10 and 70 K/s, respectively, which then on further increase of the cooling rate leads to a distinct reduction of the β-crystal fraction.
AB - The efficiency of γ-quinacridone to nucleate β-crystal formation in isotactic polypropylene (iPP) at rapid cooling has been evaluated by a combination of fast scanning chip calorimetry (FSC) and wide-angle X-ray scattering (WAXS). For samples with different amount of γ-quinacridone, FSC experiments revealed information about a critical cooling rate above which the crystallization temperature decreases to below 105 °C, that is, to temperatures at which the growth rate of α-crystals is higher than that of β-crystals. Microfocus WAXS analysis was then applied to gain information about the competition of formation of β- and α-crystals in samples prepared at defined cooling conditions at rates up to 1000 K/s in the FSC. For iPP containing 1 and 500 ppm γ-quinacridone, the crystallization temperature is lower than 105 °C on cooling faster about 10 and 70 K/s, respectively, which then on further increase of the cooling rate leads to a distinct reduction of the β-crystal fraction.
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U2 - 10.1063/1.4949651
DO - 10.1063/1.4949651
M3 - Conference contribution
AN - SCOPUS:84984587006
T3 - AIP Conference Proceedings
BT - VIII International Conference on "Times of Polymers and Composites"
A2 - D'Amore, Alberto
A2 - Grassia, Luigi
A2 - Acierno, Domenico
PB - American Institute of Physics Inc.
T2 - 8th International Conference on Times of Polymers and Composites: From Aerospace to Nanotechnology
Y2 - 19 June 2016 through 23 June 2016
ER -