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Statements

Subject Item
n2:RIV%2F70883521%3A28610%2F13%3A43871029%21RIV14-MSM-28610___
rdf:type
n8:Vysledek skos:Concept
dcterms:description
Crystalline morphology influences greatly mechanical properties. Firstly the influence of crystallization temperature on elastic behavior of miscible polypropylene (PP)/hydrogenated polybutadiene (hBR) blends is discussed in terms of residual strain values after pre-defined stretching. The structure was directly observed in nano-scale by transmission electron microscopy (TEM) and quantitatively evaluated by differential scanning calorimetry (DSC). PP/hBR blends serve as a model for explanation of the elastic behaviour of polyolefinic TPE containing PP. There is a big difference in structure and properties for neat PP and PP/hBR blend. Regardless on crystallization temperature, PP shows always yielding point, i.e. plastic deformation after stretching even to small deformation. In neat PP, the crosshatch lamellar crystals were always formed. The situation for PP/hBR blend was completely different. The elastic properties are highly affected by crystallization temperature. The optimum in temperature of cooling medium was found to be around room temperature. In this case the formation of long crosshatch lamellae was prevented and the small fragmented crystal lamellae were formed. The fragmented crystallites play a role of tie points for amorphous chains to render good elastomeric behaviour. There is no yielding point in stress-strain curves for those blends. Crystalline morphology influences greatly mechanical properties. Firstly the influence of crystallization temperature on elastic behavior of miscible polypropylene (PP)/hydrogenated polybutadiene (hBR) blends is discussed in terms of residual strain values after pre-defined stretching. The structure was directly observed in nano-scale by transmission electron microscopy (TEM) and quantitatively evaluated by differential scanning calorimetry (DSC). PP/hBR blends serve as a model for explanation of the elastic behaviour of polyolefinic TPE containing PP. There is a big difference in structure and properties for neat PP and PP/hBR blend. Regardless on crystallization temperature, PP shows always yielding point, i.e. plastic deformation after stretching even to small deformation. In neat PP, the crosshatch lamellar crystals were always formed. The situation for PP/hBR blend was completely different. The elastic properties are highly affected by crystallization temperature. The optimum in temperature of cooling medium was found to be around room temperature. In this case the formation of long crosshatch lamellae was prevented and the small fragmented crystal lamellae were formed. The fragmented crystallites play a role of tie points for amorphous chains to render good elastomeric behaviour. There is no yielding point in stress-strain curves for those blends.
dcterms:title
CRYSTALLIZATION IN MISCIBLE AND IMMISCIBLE POLYMER BLENDS CRYSTALLIZATION IN MISCIBLE AND IMMISCIBLE POLYMER BLENDS
skos:prefLabel
CRYSTALLIZATION IN MISCIBLE AND IMMISCIBLE POLYMER BLENDS CRYSTALLIZATION IN MISCIBLE AND IMMISCIBLE POLYMER BLENDS
skos:notation
RIV/70883521:28610/13:43871029!RIV14-MSM-28610___
n8:predkladatel
n9:orjk%3A28610
n3:aktivita
n19:P
n3:aktivity
P(ED2.1.00/03.0111)
n3:dodaniDat
n11:2014
n3:domaciTvurceVysledku
n16:9978429
n3:druhVysledku
n15:C
n3:duvernostUdaju
n21:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
67400
n3:idVysledku
RIV/70883521:28610/13:43871029
n3:jazykVysledku
n17:eng
n3:klicovaSlova
immiscible; miscible; crystallization; polypropylene; polymer blends
n3:klicoveSlovo
n12:immiscible n12:polypropylene n12:miscible n12:crystallization n12:polymer%20blends
n3:kontrolniKodProRIV
[8173C67E296F]
n3:mistoVydani
New York
n3:nazevEdiceCisloSvazku
neuveden
n3:nazevZdroje
Polypropylene: Synthesis, Applications and Environmental Concerrns
n3:obor
n5:CD
n3:pocetDomacichTvurcuVysledku
1
n3:pocetStranKnihy
373
n3:pocetTvurcuVysledku
1
n3:projekt
n18:ED2.1.00%2F03.0111
n3:rokUplatneniVysledku
n11:2013
n3:tvurceVysledku
Svoboda, Petr
s:numberOfPages
34
n10:hasPublisher
Nova Science Publishers
n20:isbn
978-1-62417-142-0
n7:organizacniJednotka
28610