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Statements

Subject Item
n2:RIV%2F70883521%3A28150%2F11%3A43867026%21RIV12-MSM-28150___
rdf:type
n7:Vysledek skos:Concept
dcterms:description
Crystallization kinetics of polypropylene (PP)/ethylene–octene copolymer (EOC) blends was measured by differential scanning calorimetry (DSC) and by optical microscopy at various temperatures (123-140°C). By DSC it was found that small amounts of EOC (10–30%) increase the bulk crystallization kinetics; in some cases even 80% increase was observed. Larger amounts of EOC (50–80%) have caused a decrease in crystallization kinetics. Optical microscopy has revealed that crystallization kinetics of a single spherulite is decreased by the presence of EOC, and at the same time there are more spherulites in the blend. EOC acts as a nucleation agent increasing the bulk crystallization rate and at the same time it acts as an obstacle to the growing front of a spherulite when the PP lamellae have to go around the EOC obstacle. This was confirmed by detailed analyses according to Avrami and Hoffman–Lauritzen. Structure was also observed by transmission electron microscopy (TEM). At low PP content (20%) PP forms very small isolated particles with size smaller than 1 micrometer. At 40% of PP a structure resembling a co-continuous one was found. Whenthe PP is a majority phase (20–40% of EOC) rather large EOC particles were found. TEM also revealed presence of PP lamellae in EOC regions that together with Tg shift of PP and also EOC suggested partial miscibility. While at low temperatures the crystallization is very fast, at higher temperatures there is a competition of phase separation and crystallization. Crystallization kinetics of polypropylene (PP)/ethylene–octene copolymer (EOC) blends was measured by differential scanning calorimetry (DSC) and by optical microscopy at various temperatures (123-140°C). By DSC it was found that small amounts of EOC (10–30%) increase the bulk crystallization kinetics; in some cases even 80% increase was observed. Larger amounts of EOC (50–80%) have caused a decrease in crystallization kinetics. Optical microscopy has revealed that crystallization kinetics of a single spherulite is decreased by the presence of EOC, and at the same time there are more spherulites in the blend. EOC acts as a nucleation agent increasing the bulk crystallization rate and at the same time it acts as an obstacle to the growing front of a spherulite when the PP lamellae have to go around the EOC obstacle. This was confirmed by detailed analyses according to Avrami and Hoffman–Lauritzen. Structure was also observed by transmission electron microscopy (TEM). At low PP content (20%) PP forms very small isolated particles with size smaller than 1 micrometer. At 40% of PP a structure resembling a co-continuous one was found. Whenthe PP is a majority phase (20–40% of EOC) rather large EOC particles were found. TEM also revealed presence of PP lamellae in EOC regions that together with Tg shift of PP and also EOC suggested partial miscibility. While at low temperatures the crystallization is very fast, at higher temperatures there is a competition of phase separation and crystallization.
dcterms:title
Isothermal crystallization in polypropylene/ethylene–octene copolymer blends Isothermal crystallization in polypropylene/ethylene–octene copolymer blends
skos:prefLabel
Isothermal crystallization in polypropylene/ethylene–octene copolymer blends Isothermal crystallization in polypropylene/ethylene–octene copolymer blends
skos:notation
RIV/70883521:28150/11:43867026!RIV12-MSM-28150___
n7:predkladatel
n18:orjk%3A28150
n3:aktivita
n17:Z n17:S n17:P
n3:aktivity
P(ED2.1.00/03.0111), S, Z(MSM7088352102)
n3:cisloPeriodika
1-2
n3:dodaniDat
n6:2012
n3:domaciTvurceVysledku
n20:9162496
n3:druhVysledku
n21:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
205932
n3:idVysledku
RIV/70883521:28150/11:43867026
n3:jazykVysledku
n10:eng
n3:klicovaSlova
Nucleation; Optical microscopy; Electron microscopy (TEM); Crystallization
n3:klicoveSlovo
n4:Electron%20microscopy%20%28TEM%29 n4:Nucleation n4:Crystallization n4:Optical%20microscopy
n3:kodStatuVydavatele
CH - Švýcarská konfederace
n3:kontrolniKodProRIV
[8815B75B8B9E]
n3:nazevZdroje
Materials Chemistry and Physics
n3:obor
n16:CD
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
8
n3:projekt
n11:ED2.1.00%2F03.0111
n3:rokUplatneniVysledku
n6:2011
n3:svazekPeriodika
131
n3:tvurceVysledku
Svoboda, Petr Ougizawa, Toshiaki Vašek, Vladimír Inoue, Takashi Mokrejš, Pavel Mori, Keisuke Trivedi, Krunal Rajendra Svobodová, Dagmar
n3:wos
000298764800017
n3:zamer
n12:MSM7088352102
s:issn
0254-0584
s:numberOfPages
10
n9:doi
10.1016/j.matchemphys.2011.07.058
n5:organizacniJednotka
28150