Journal ArticleDOI
Solid-State Polymerization of Polycarbonates Using Supercritical CO2
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In this article, the authors report the extension of the crystallization process with supercritical CO 2 to granules or beads of low molecular weight polycarbonate in an effort to create a material that can undergo slid-state polymerization without using toxic organic solvents.Abstract:
We report the extension of the crystallization process with supercritical CO 2 to granules or beads of low molecular weight polycarbonate in an effort to create a material that can undergo slid-state polymerization without using toxic organic solventsread more
Citations
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Die CO2‐Technologie: ein wichtiges Instrument für die Lösung von Umweltproblemen
TL;DR: In this paper, the authors present an all-gemeinen Uberblick uber die derzeitigen Anwendungen von CO2 and den Stand der Technik auf diesem Gebiet geben.
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Cosolvent effect of water in supercritical carbon dioxide facilitating induced crystallization of polycarbonate
TL;DR: In this article, a 3D-diagram was established to show the relationship between crystallization and solubility parameter of mixed supercritical fluid at different temperatures and pressures, and the results showed that polycarbonate has a wider range of crystallization temperature and pressure in water-saturated supercritical CO2 than in pure scCO2.
Journal ArticleDOI
Synthesis of High Molecular Weight Nylon 46 in Supercritical Carbon Dioxide
TL;DR: Nylon 46 with high molecular weight was successfully synthesized in supercritical carbon dioxide (sc-CO2) by one-step three-stage polymerization using the salt prepared from 1,4-diaminobutane and 1...
Journal ArticleDOI
Non-isothermal kinetics of epoxy resin curing reaction under compressed CO 2
TL;DR: In this article, the non-isothermal curing kinetics of epoxy resin system consisting of diglycidyl ether of bisphenol A (DGEBA) and m-xylylenediamine (MXDA) were investigated by high-pressure differential scanning calorimetry at different heating rates of 5, 10, 15 and 20 Kmin−1 under compressed carbon dioxide (CO2) of 0.1-8 MPa.
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Electron paramagnetic resonance spin probe study of carbon dioxide‐induced polymer plasticization
TL;DR: In this article, the authors investigated the plasticization of poly(vinyl acetate) and poly(ethyl methacrylate) by carbon dioxide and found that the glass transition for each polymer could be depressed to 25 °C by varying the CO2 pressure at constant ambient temperature.
References
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Journal ArticleDOI
Polymer Crystallization By Chemical Nucleation
TL;DR: In this article, the mechanism of action of organic nucleating agents such as sodium benzoate and its derived salts completely differs from the generally accepted model, at least in the case of polyesters.
Journal ArticleDOI
Crystallization of bisphenol a polycarbonate induced by supercritical carbon dioxide
Eric J. Beckman,Roger S. Porter +1 more
TL;DR: In this paper, supercritical carbon dioxide readily induces crystallization in bisphenol A polycarbonate and the degree of crystallinity increases sharply as the CO2 pressure is raised from 100 to 300 atm but levels off thereafter.
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Correlation between the enthalpy of fusion and the specific volume of crystallized polycarbonate of bisphenol A.
J. P. Mercier,R. Legras +1 more
TL;DR: In this article, a linear correlation was established between these two physical variables and from this an enthalpy of fusion for the polycarbonate crystal of 26 Kcal was deduced.
Journal ArticleDOI
Solid-state polymerization of poly(aryl carbonates): a facile route to high-molecular-weight polycarbonates
TL;DR: In this article, it was reported that poly(aryl carbonate) can undergo chain extension in the solid state to substantially high molecular weight polymers, and the increase in molecular weight was also accompanied by an increase in the polymer cryustallinity.
Journal ArticleDOI
Structure and morphology of polycarbonate synthesized by solid state polycondensation
TL;DR: In this paper, solid state polycondensation (SSP) crystallizes polycarbonate in an orthorhombic configuration with a = 12.1 A, b = 10.5 A and c = 22.0 A.