CO2-induced crystallization of poly(ethylene terephthalate)

Mizoguchi, Keishin; Hirose, Takuji; Naito, Yasutoshi; Kamiya, Yuichi

doi:10.1016/0032-3861(87)90441-1

Cited by 113 publications

(90 citation statements)

References 22 publications

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“…Further, it can induce crystallization of the matrix and cause an increase in the melting temperature and melting enthalpy. [23][24][25][26] Here, differential scanning calorimetry measurement was performed to study the crystallinity of virgin and foamed PLA/starch composites. The experimental results are shown in Figure 4.…”

Section: Crystallinity Of the Foaming Materialsmentioning

confidence: 99%

Study of different effects on foaming process of biodegradable PLA/starch composites in supercritical/compressed carbon dioxide

Hao

Geng

et al. 2008

J of Applied Polymer Sci

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Microcellular foaming of biodegradable and biocompatible PLA/starch composites in supercritical/compressed CO 2 has been studied. The purpose of this study is to explore the potential application of this kind of materials in medical materials or drug containers. The rate of CO 2 uptake and CO 2 equilibrium concentration in PLA/starch composites were studied by performing sorption and desorption experiments. The effects of a series of variable factors, such as saturation time and saturation temperature on the foaming morphology were studied through SEM observation and density measurement. The experimental results show that, while keeping other variables unchanged, longer saturation time leads to reduced bulk foam densities and different saturation pressures result in different bulk foam densities. The crystallinity of PLA-starch sample was characterized by differential scanning calorimetry. It indicates that the foaming treatment with supercritical CO 2 increased the crystallinity of PLA/starch composites.

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Section: Crystallinity Of the Foaming Materialsmentioning

confidence: 99%

Study of different effects on foaming process of biodegradable PLA/starch composites in supercritical/compressed carbon dioxide

Hao

Geng

et al. 2008

J of Applied Polymer Sci

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“…Sufficient relaxation in polymers caused either by heating or dissolution of CO 2 can result in an increase of free volume and hence chain ordering and crystallization in the polymers. CO 2 -induced crystallization has been observed in poly(ethylene terephthalate) (PET), 6 poly(pphenylene sulfide), 7 polycarbonate, 8 poly(ether ether ketone), 9 methyl-substituted poly(ether ether ketone) 10 and poly(lactic acid) (PLA). 11 Under a CO 2 environment, the crystalline melt point (T m ) and cold crystallization temperature (T c ) are also depressed.…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide‐induced crystallization in poly(L‐lactic acid) and its effect on foam morphologies

Liao

Nawaby

Whitfield

2010

Polymer International

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The effect of carbon dioxide (CO2) on the physical properties of poly(L‐lactic acid) (PLLA) and on the formation of crystalline domains was investigated. The presence of CO2 in the matrix was found to induce crystallization in PLLA, with the crystallinity increasing with increasing CO2 pressure. The combination of saturation conditions and formation of crystalline domains was studied for its effect on the formation of porous morphologies in PLLA. Moreover, the effect of CO2 on PLLA properties and formation of porous structures was further exploited by first creating crystalline domains in samples using CO2 at various pressures at 25 °C and then re‐saturating the same samples with CO2 at a constant pressure of 2.8 MPa and 0 °C. This paper reports on the solubility of CO2 at 25 and 0 °C in PLLA, crystallization and subsequent effect on foam morphologies when processed using different saturation cycles. Unique and intriguing morphologies were obtained by specifically controlling the properties of PLLA. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd

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“…[28][29][30][31] Consequently, a polymer can crystallize at a temperature below its nominal T g when contacted with supercritical fluids. [32][33][34][35][36][37][38] Unlike liquid solvents and vapors, the activity of a supercritical fluid can be changed continuously by simply changing its pressure. Furthermore, fluids like CO 2 are easily removed from the polymer matrix by depressurizing the system, thus making them better candidates to change the polymer morphology.…”

Section: Introductionmentioning

confidence: 99%

Effect of Compressed CO₂ on Phase Transitions and Polymorphism in Syndiotactic Polystyrene

1997

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When treated with compressed CO2, syndiotactic polystyrene (sPS) undergoes a number of solid-solid transitions that do not occur on treatment with liquid solvents. For example, planar mesophase f , R f , and γ f transitions can be brought about under appropriate conditions of temperature and CO2 pressure. In addition, the transitions of glassy sPS to the planar mesomorphic and to the R form, and the γ f R transition occur at temperatures lower than when the same transitions are effected under ambient pressure. The dissolved CO2 lowers the glass transition and the cold crystallization temperatures of sPS at the rate of -0.92 and -0.58°C/atm, respectively. Crystallization kinetics from the sPS-CO2 solution follow the Avrami equation, but the value of the exponent n is lower than when crystallization is conducted under ambient pressure.

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CO2-induced crystallization of poly(ethylene terephthalate)

Cited by 113 publications

References 22 publications

Study of different effects on foaming process of biodegradable PLA/starch composites in supercritical/compressed carbon dioxide

Study of different effects on foaming process of biodegradable PLA/starch composites in supercritical/compressed carbon dioxide

Carbon dioxide‐induced crystallization in poly(L‐lactic acid) and its effect on foam morphologies

Effect of Compressed CO₂ on Phase Transitions and Polymorphism in Syndiotactic Polystyrene

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CO2-induced crystallization of poly(ethylene terephthalate)

Cited by 113 publications

References 22 publications

Study of different effects on foaming process of biodegradable PLA/starch composites in supercritical/compressed carbon dioxide

Study of different effects on foaming process of biodegradable PLA/starch composites in supercritical/compressed carbon dioxide

Carbon dioxide‐induced crystallization in poly(L‐lactic acid) and its effect on foam morphologies

Effect of Compressed CO2 on Phase Transitions and Polymorphism in Syndiotactic Polystyrene

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Effect of Compressed CO₂ on Phase Transitions and Polymorphism in Syndiotactic Polystyrene