LrgpV1, Main, Exploration, bibRecord, 000932

Oriented foaming of polystyrene with supercritical carbon dioxide for toughening

Identifieur interne : 000932 ( Main/Exploration ); précédent : 000931; suivant : 000933

Oriented foaming of polystyrene with supercritical carbon dioxide for toughening

Auteurs : Jin-Biao Bao [République populaire de Chine] ; TAO LIU [République populaire de Chine] ; LING ZHAO [République populaire de Chine] ; Guo-Hua Hu [France] ; XIARAN MIAO [République populaire de Chine] ; XIUHONG LI [République populaire de Chine]

Source :

Polymer : (Guildford) [ 0032-3861 ] ; 2012.

RBID : Pascal:13-0160413

Descripteurs français

Pascal (Inist)
- Plastique alvéolaire, Styrène polymère, Structure cellulaire, Anisotropie, Relation structure propriété, Propriété mécanique, Etude expérimentale.

English descriptors

KwdEn :
- Anisotropy, Cell structure, Cellular plastic, Experimental study, Mechanical properties, Property structure relationship, Styrene polymer.

Abstract

Polystyrene (PS) foams with isotropy cell morphology and oriented cell morphology were prepared to investigate the relationship between the cell morphologies and the mechanical properties (tensile and impact properties). For the isotropy cell morphologies, the tensile strength, tensile modulus and impact strength of PS foams all increase with the increase of relative density. When the relative density is constant, the cell size does not affect the tensile strength and modulus but has a modest effect on the impact strength. The solid area (cell walls) fraction on the fracture-surface and the cell walls finely dispersed by the bubbles are the main reasons for the toughening of isotropy PS foams. For oriented foams, the cell morphologies oriented perpendicular to the impact direction could significantly enhance the toughness of PS foams. The oriented bubbles and the matrix perpendicular to the fracture propagation direction are expected to absorbed large impact energy during the fracture process and make sample more ductile. The impact strength of the highly oriented PS foam in this work is about 1.5 times that of the unfoamed one while its relative density is 0.3. Small angle X-ray scattering (SAXS) measurements indicate that the molecular chains can be oriented by the shearing of the bubbles by oriented foaming, which leads to the improvement of tensile strength along oriented direction. In addition, the cells oriented parallel to the impact direction result in the poor impact properties.

Affiliations:

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

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to stream PascalFrancis, to step Curation: 000A42
to stream PascalFrancis, to step Checkpoint: 000086
to stream Main, to step Merge: 000A13
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Le document en format XML

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<front><div type="abstract" xml:lang="en">Polystyrene (PS) foams with isotropy cell morphology and oriented cell morphology were prepared to investigate the relationship between the cell morphologies and the mechanical properties (tensile and impact properties). For the isotropy cell morphologies, the tensile strength, tensile modulus and impact strength of PS foams all increase with the increase of relative density. When the relative density is constant, the cell size does not affect the tensile strength and modulus but has a modest effect on the impact strength. The solid area (cell walls) fraction on the fracture-surface and the cell walls finely dispersed by the bubbles are the main reasons for the toughening of isotropy PS foams. For oriented foams, the cell morphologies oriented perpendicular to the impact direction could significantly enhance the toughness of PS foams. The oriented bubbles and the matrix perpendicular to the fracture propagation direction are expected to absorbed large impact energy during the fracture process and make sample more ductile. The impact strength of the highly oriented PS foam in this work is about 1.5 times that of the unfoamed one while its relative density is 0.3. Small angle X-ray scattering (SAXS) measurements indicate that the molecular chains can be oriented by the shearing of the bubbles by oriented foaming, which leads to the improvement of tensile strength along oriented direction. In addition, the cells oriented parallel to the impact direction result in the poor impact properties.</div>
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Oriented foaming of polystyrene with supercritical carbon dioxide for toughening

Oriented foaming of polystyrene with supercritical carbon dioxide for toughening

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