Effect of Organic Co-blowing Agents on the Morphology of CO2 Blown Microcellular Polystyrene Foams.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F17%3A00476682" target="_blank" >RIV/67985858:_____/17:00476682 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22340/17:43914176 RIV/49777513:23640/17:43932543

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.supflu.2017.07.026" target="_blank" >http://dx.doi.org/10.1016/j.supflu.2017.07.026</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.supflu.2017.07.026" target="_blank" >10.1016/j.supflu.2017.07.026</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of Organic Co-blowing Agents on the Morphology of CO2 Blown Microcellular Polystyrene Foams.

Popis výsledku v původním jazyce

Microcellular polystyrene (PS) foams blown with supercritical CO2 in batch processes have usually porosities lower than desired for good heat insulators. Porosities can be increased by co-blowing agents. We studied effects of n-pentane (nC5) and cyclopentane (cC5) on foaming in a batch. Neat PS films were impregnated first with nC5 or cC5, then with high-pressure or supercritical CO2, and finally foamed. Cell diameters and bulk porosities were determined from SEM images. The co-blowing agents reduced the solid skin, they acted mainly as plasticizers, both porosity and cell diameters increased with their concentration. After crossing a particular concentration, the cell size remained almost constant. Impregnation of neat PS with high-pressure liquid CO2 near room temperature enabled to prepare foams with cell diameters below 10 μm and porosities about 80 %, which has not been reported before. Hence, organic co-blowing agents could be used to increase the porosity of CO2 blown foams.

Název v anglickém jazyce

Effect of Organic Co-blowing Agents on the Morphology of CO2 Blown Microcellular Polystyrene Foams.

Popis výsledku anglicky

Microcellular polystyrene (PS) foams blown with supercritical CO2 in batch processes have usually porosities lower than desired for good heat insulators. Porosities can be increased by co-blowing agents. We studied effects of n-pentane (nC5) and cyclopentane (cC5) on foaming in a batch. Neat PS films were impregnated first with nC5 or cC5, then with high-pressure or supercritical CO2, and finally foamed. Cell diameters and bulk porosities were determined from SEM images. The co-blowing agents reduced the solid skin, they acted mainly as plasticizers, both porosity and cell diameters increased with their concentration. After crossing a particular concentration, the cell size remained almost constant. Impregnation of neat PS with high-pressure liquid CO2 near room temperature enabled to prepare foams with cell diameters below 10 μm and porosities about 80 %, which has not been reported before. Hence, organic co-blowing agents could be used to increase the porosity of CO2 blown foams.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Supercritical Fluids

ISSN

0896-8446

e-ISSN

—

Svazek periodika

130

Číslo periodika v rámci svazku

DEC 2017

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

30-39

Kód UT WoS článku

000412254200005

EID výsledku v databázi Scopus

2-s2.0-85026452944