Thermodynamic behavior and crystal structure of polypropylene treated with supercritical carbon dioxide
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Wenjun Shao
Abstract
Controlling temperature and pressure during the supercritical carbon dioxide (scCO2) process can change the mount of CO2 entered in polypropylene (PP) phase, thereby changing the mechanical properties of materials. The effect of scCO2 treatment on the crystallization behavior is different in the semi-molten and molten states. This study investigates the PP treated with scCO2 near the melting point and at various pressures, and explores the effects of temperature and pressure on the crystal structure, lamellar structure, and thermodynamic properties of PP. The results show that at a melting temperature of 165 °C, scCO2 can enhances the ability of PP molecules to makes the PP crystal region more regular, and forms larger microcrystals and lamellae. Additionally, increasing the pressure can make more CO2 enter the PP crystal region and further improve the regularity of the crystal. At a semi-melting temperature of 155 °C, scCO2 is primarily in the amorphous region because it is difficult to enter the PP crystal region. Even if increasing the pressure, it has little effect on the crystal size and lamellar thickness of PP. The research has significant implications for developing and utilizing scCO2 to remove ash from materials.
Funding source: Climbing scholar
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Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was supported by the Liaoning Pandeng Scholar program. Synchrotron Radiation WAXD characterizations were performed at beamline 1W2A of the Beijing Synchrotron Radiation Facility (BSRF). The authors are grateful for the assistance of the beamline scientists at BSRF, especially Guang Mo, Synchrotron Radiation WAXD. SAXS characterizations were performed at beamline BL16B1 of the Shanghai Synchrotron Radiation Facility (SSRF).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2022 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Material Properties
- Thermodynamic behavior and crystal structure of polypropylene treated with supercritical carbon dioxide
- Investigation of conductivity, SEM, XRD studies of Mg2+ ion based TiO2 nanocomposite PVDF-HFP polymer electrolyte and application in a dye sensitized solar cell
- Computational prediction of electrical percolation threshold in polymer/graphene-based nanocomposites with finite element method
- Influence mechanisms of 2-amino-1,3,5-triazine-4,6-dithiol coating on adhesion properties of polybutylene terephthalate/aluminum interface in nano-injection molding
- Effects of enzyme-assisted ultrasonic treatment to the properties of nanofibrils isolated from wheat straw
- Preparation and Assembly
- Solution blow spinning polysulfone-Aliquat 336 nanofibers: synthesis, characterization, and application for the extraction and preconcentration of losartan from aqueous solutions
- Novel alginate immobilized TiO2 reusable functional hydrogel beads with high photocatalytic removal of dye pollutions
- Engineering and Processing
- Effects of gas-assisted technology on polymer micro coextrusion
- Influence of crystallinity on wear behavior of ultrahigh molecular weight polyethylene and the wear mechanism
- Identification of tensile behaviour of polylactic acid parts manufactured by fused deposition modelling under heat-treated conditions using nonlinear autoregressive with exogenous and transfer function models
Articles in the same Issue
- Frontmatter
- Material Properties
- Thermodynamic behavior and crystal structure of polypropylene treated with supercritical carbon dioxide
- Investigation of conductivity, SEM, XRD studies of Mg2+ ion based TiO2 nanocomposite PVDF-HFP polymer electrolyte and application in a dye sensitized solar cell
- Computational prediction of electrical percolation threshold in polymer/graphene-based nanocomposites with finite element method
- Influence mechanisms of 2-amino-1,3,5-triazine-4,6-dithiol coating on adhesion properties of polybutylene terephthalate/aluminum interface in nano-injection molding
- Effects of enzyme-assisted ultrasonic treatment to the properties of nanofibrils isolated from wheat straw
- Preparation and Assembly
- Solution blow spinning polysulfone-Aliquat 336 nanofibers: synthesis, characterization, and application for the extraction and preconcentration of losartan from aqueous solutions
- Novel alginate immobilized TiO2 reusable functional hydrogel beads with high photocatalytic removal of dye pollutions
- Engineering and Processing
- Effects of gas-assisted technology on polymer micro coextrusion
- Influence of crystallinity on wear behavior of ultrahigh molecular weight polyethylene and the wear mechanism
- Identification of tensile behaviour of polylactic acid parts manufactured by fused deposition modelling under heat-treated conditions using nonlinear autoregressive with exogenous and transfer function models
