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Supercritical carbon dioxide‐induced melting temperature depression and crystallization of syndiotactic polypropylene

Identifieur interne : 001223 ( Main/Merge ); précédent : 001222; suivant : 001224

Supercritical carbon dioxide‐induced melting temperature depression and crystallization of syndiotactic polypropylene

Auteurs : Bin Li [République populaire de Chine] ; Xinyuan Zhu [République populaire de Chine] ; Guo-Hua Hu [France, République populaire de Chine] ; Tao Liu [République populaire de Chine] ; Guiping Cao [République populaire de Chine] ; Ling Zhao [République populaire de Chine] ; Weikang Yuan [République populaire de Chine]

Source :

Polymer Engineering & Science [ 0032-3888 ] ; 2008-08.

RBID : ISTEX:55A361CD707648AECBCEF8952879E9FF46653F14

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Wicri :
- topic : Polymère.

English descriptors

Abstract

This work was aimed at studying supercritical carbon dioxide (scCO2)‐induced melting temperature depression and crystallization of a syndiotactic polypropylene (sPP). Under scCO2, the melting temperature of the sPP could be significantly reduced depending on the CO2 pressure. The scCO2‐induced crystallization of sPP was investigated using differential scanning calorimeter (DSC) and Fourier transform infrared spectroscopy. Two melting peaks were observed in DSC. The one at lower melting temperature referred to the melting of the sPP crystals induced by scCO2 in its amorphous phase. Its location was shifted to higher temperature, and its area increased with increasing scCO2 treatment time, temperature, and pressure. The melting peak at higher temperature corresponded to the melting of the sPP crystals that already existed before scCO2 treatment. Its location and area remained almost unaffected by the scCO2 treatment. The scCO2‐induced crystallization was related to scCO2‐promoted transformation of the mesophase form III of the sPP to the stable form I. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers

Url:

https://api.istex.fr/document/55A361CD707648AECBCEF8952879E9FF46653F14/fulltext/pdf

DOI: 10.1002/pen.21137

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amorphous phase</term>
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<term>Contract grant sponsor</term>
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<term>Crystallization</term>
<term>Different stabilities</term>
<term>Different temperatures</term>
<term>Different types</term>
<term>Differential scanning calorimeter</term>
<term>Diffraction peak</term>
<term>Ftir</term>
<term>Ftir results</term>
<term>Ftir spectra</term>
<term>Heating rate</term>
<term>Helical</term>
<term>Helical conformations</term>
<term>High temperature</term>
<term>Higher temperature</term>
<term>Infrared spectroscopy</term>
<term>Lower temperature</term>
<term>Macromolecule</term>
<term>Mesophase form</term>
<term>Molar volume</term>
<term>Other hand</term>
<term>Polym</term>
<term>Polymer</term>
<term>Polymer chains</term>
<term>Polymer engineering</term>
<term>Room temperature</term>
<term>Samples pretreated</term>
<term>Scco2</term>
<term>Scco2 treatment</term>
<term>Scco2 treatment time</term>
<term>Semicrystalline polymers</term>
<term>Small extent</term>
<term>Stable form</term>
<term>Structural changes</term>
<term>Supercritical carbon dioxide</term>
<term>Syndiotactic polypropylene</term>
<term>Temperature depression</term>
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<term>Transplanar conformations</term>
<term>Transplanar form</term>
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<term>Vacuum oven</term>
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<term>Contract grant sponsor</term>
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<term>Crystallization</term>
<term>Different stabilities</term>
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<term>Ftir spectra</term>
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<term>Polymer engineering</term>
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<term>Scco2</term>
<term>Scco2 treatment</term>
<term>Scco2 treatment time</term>
<term>Semicrystalline polymers</term>
<term>Small extent</term>
<term>Stable form</term>
<term>Structural changes</term>
<term>Supercritical carbon dioxide</term>
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<term>Transplanar conformation</term>
<term>Transplanar conformations</term>
<term>Transplanar form</term>
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<front><div type="abstract" xml:lang="en">This work was aimed at studying supercritical carbon dioxide (scCO2)‐induced melting temperature depression and crystallization of a syndiotactic polypropylene (sPP). Under scCO2, the melting temperature of the sPP could be significantly reduced depending on the CO2 pressure. The scCO2‐induced crystallization of sPP was investigated using differential scanning calorimeter (DSC) and Fourier transform infrared spectroscopy. Two melting peaks were observed in DSC. The one at lower melting temperature referred to the melting of the sPP crystals induced by scCO2 in its amorphous phase. Its location was shifted to higher temperature, and its area increased with increasing scCO2 treatment time, temperature, and pressure. The melting peak at higher temperature corresponded to the melting of the sPP crystals that already existed before scCO2 treatment. Its location and area remained almost unaffected by the scCO2 treatment. The scCO2‐induced crystallization was related to scCO2‐promoted transformation of the mesophase form III of the sPP to the stable form I. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers</div>
</front>
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Supercritical carbon dioxide‐induced melting temperature depression and crystallization of syndiotactic polypropylene

Supercritical carbon dioxide‐induced melting temperature depression and crystallization of syndiotactic polypropylene

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Descripteurs français

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Abstract

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