LrgpV1, Main, Exploration, bibRecord, 000B91

Supercritical Carbon Dioxide Induced Foaming of Highly Oriented Isotactic Polypropylene

Identifieur interne : 000B91 ( Main/Exploration ); précédent : 000B90; suivant : 000B92

Supercritical Carbon Dioxide Induced Foaming of Highly Oriented Isotactic Polypropylene

Auteurs : Jin-Biao Bao [République populaire de Chine, France] ; TAO LIU [République populaire de Chine] ; LING ZHAO [République populaire de Chine] ; Danielle Earth [France] ; Guo-Hua Hu [France]

Source :

Industrial & engineering chemistry research [ 0888-5885 ] ; 2011.

RBID : Pascal:12-0028350

Descripteurs français

Pascal (Inist)
- Dioxyde de carbone, Etat supercritique, Moussage.

English descriptors

KwdEn :
- Carbon dioxide, Foaming, Supercritical state.
mix :
- ADDITIVES, CELL NUCLEATION, CO2, CRYSTALLIZATION BEHAVIOR, DISPERSION, POLYMER-FILMS, SCALE, TEMPERATURE.

Abstract

A highly oriented isotactic polypropylene (iPP) with a shish-kebab crystalline structure is used as a template to achieve nanocellular foams by CO₂ foaming in the solid state. The shish-kebab crystalline structure is obtained by tuning injection-molding conditions. Nanocells are generated in amorphous domains confined by shish-kebab crystalline domains which cannot foam. The highly oriented iPP consists of both shish-kebab crystalline structure and spherulites structure and is used to investigate the effect of the crystalline morphology on the cell formation at a given CO₂ saturation pressure (15 MPa) and various foaming temperatures (135, 140, 143, and 146 °C). When the foaming temperature is 143°C, a uniform open nanocellular morphology is obtained. The cell size and cell density both increase with foaming temperature from 135 to 143 °C due to the fact that more crystals are molten, providing more space for cell nucleation and growth. However, when the foaming temperature is increased to 146 °C, the cell size abruptly increases from dozens of nanometers to dozens of micrometers, and the corresponding cell density decreases by several orders of magnitude.

Url:

https://hal.archives-ouvertes.fr/hal-00776366

Affiliations:

Le document en format XML

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<series><title level="j" type="main">Industrial & engineering chemistry research</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbon dioxide</term>
<term>Foaming</term>
<term>Supercritical state</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Dioxyde de carbone</term>
<term>Etat supercritique</term>
<term>Moussage</term>
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<keywords scheme="mix" xml:lang="en"><term>ADDITIVES</term>
<term>CELL NUCLEATION</term>
<term>CO2</term>
<term>CRYSTALLIZATION BEHAVIOR</term>
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<front><div type="abstract" xml:lang="en">A highly oriented isotactic polypropylene (iPP) with a shish-kebab crystalline structure is used as a template to achieve nanocellular foams by CO<sub>2</sub>
 foaming in the solid state. The shish-kebab crystalline structure is obtained by tuning injection-molding conditions. Nanocells are generated in amorphous domains confined by shish-kebab crystalline domains which cannot foam. The highly oriented iPP consists of both shish-kebab crystalline structure and spherulites structure and is used to investigate the effect of the crystalline morphology on the cell formation at a given CO<sub>2</sub>
 saturation pressure (15 MPa) and various foaming temperatures (135, 140, 143, and 146 °C). When the foaming temperature is 143°C, a uniform open nanocellular morphology is obtained. The cell size and cell density both increase with foaming temperature from 135 to 143 °C due to the fact that more crystals are molten, providing more space for cell nucleation and growth. However, when the foaming temperature is increased to 146 °C, the cell size abruptly increases from dozens of nanometers to dozens of micrometers, and the corresponding cell density decreases by several orders of magnitude.</div>
</front>
</TEI>
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<name sortKey="Earth, Danielle" sort="Earth, Danielle" uniqKey="Earth D" first="Danielle" last="Earth">Danielle Earth</name>
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Supercritical Carbon Dioxide Induced Foaming of Highly Oriented Isotactic Polypropylene

Supercritical Carbon Dioxide Induced Foaming of Highly Oriented Isotactic Polypropylene

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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