Simulations of polymer crystallization under high pressure

Ito, Hiroshi; Tsutsumi, Y.; Minagawa, Keiji; Takimoto, Jun–ichi; Koyama, Kiyohito

doi:10.1007/bf00658762

Cited by 35 publications

(20 citation statements)

References 14 publications

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“…This effect is related to an increase in the crystallinity of PP, as well as a decrease in number of voids and porosities in composites. These results are in agreement with results of Ito et al [19]. They observed an abrupt decline in specific volume and an increase in density corresponding to initiation of crystallization.…”

Section: Methodssupporting

confidence: 95%

Effect of temperature and pressure of hot pressing on the mechanical properties of PP–HA bio-composites

Younesi

Bahrololoom

2009

Materials & Design

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Section: Methodssupporting

confidence: 95%

Effect of temperature and pressure of hot pressing on the mechanical properties of PP–HA bio-composites

Younesi

Bahrololoom

2009

Materials & Design

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“…During the PVT tests, as T and P increase, the polymer anneals toward equilibrium. The maximum crystallization rate is expected at: T max % (T g þ T m )/2, with all three temperatures increasing with P. 53 The effect of pressure on X cryst is related to the crystal growth rate [54][55][56][57] :…”

Section: The Crystalline Regionmentioning

confidence: 99%

Equations of state for polyamide‐6 and its nanocomposites. 1. Fundamentals and the matrix

Utracki

2008

J Polym Sci B Polym Phys

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The pressure‐volume‐temperature (PVT) surface of polyamide‐6 (PA‐6) was determined in the range of temperature T = 300–600 K and pressure P = 0.1–190 MPa. The data were analyzed separately for the molten and the noncrystalline phase using the Simha‐Somcynsky (S‐S) equation of state (eos) based on the cell‐hole theory. At Tg(P) ≤ T ≤ Tm(P), the “solid” state comprises liquid phase with crystals dispersed in it. The PVT behavior of the latter phase was described using Midha‐Nanda‐Simha‐Jain (MNSJ) eos based on the cell theory. The data fitting to these two theories yielded two sets of the Lennard‐Jones interaction parameters: ε*(S‐S) = 34.0 ± 0.3 and ε*(MNSJ) = 22.8 ± 0.3 kJ/mol, whereas v*(S‐S) = 32.00 ± 0.1 and v*(MNSJ) = 27.9 ± 0.2 mL/mol. The raw PVT data were numerically differentiated to obtain the thermal expansion and compressibility coefficients, α and κ, respectively. At constant P, κ followed the same dependence on both sides of the melting zone near Tm. By contrast, α = α(T) dependencies were dramatically different for the solid and molten phase; at T < Tm, α linearly increased with increasing T, then within the melting zone, its value step‐wise decreased, to slowly increase at higher temperatures. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 299–313, 2009

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“…9 For that purpose, it was decided to investigate the crystallization kinetics of neat PLA2 with classical DSC experiments. For the DSC runs, the onset of crystallization (t 5 0) was chosen as the point at which the exothermic peak starts.…”

Section: Isothermal Crystallization Of Pla2mentioning

confidence: 99%

“…(1) to the experimental crystallization data. Using the same approach of Ito et al 9 to take into account the pressure effects on T g and T m 0 , Takada and Ohshima 4 extended this model to incorporate the effect of CO 2 on the crystallization kinetics by introducing a linear dependence of T g and T m 0 on CO 2 pressure [P CO 2 ] into eq. (1):…”

Section: Introductionmentioning

confidence: 98%

Effect of dissolved carbon dioxide on the glass transition and crystallization of poly(lactic acid) as probed by ultrasonic measurements

Reignier

Tatibouët

Gendron

2009

J of Applied Polymer Sci

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The effects of dissolved carbon dioxide (CO2) molecules on the glass‐transition temperature as well as the crystallization kinetics of poly(lactic acid) have been investigated with a novel device that combines ultrasonic and volumetric measurements. Ultrasonic parameters such as the sound velocity are very sensitive to crystallization and can be used to monitor the crystallization kinetics. The glass‐transition temperature has been found to decrease nonlinearly as the CO2 concentration increases. The maximum in the crystallization rate has been found to increase with the addition of CO2. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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Simulations of polymer crystallization under high pressure

Cited by 35 publications

References 14 publications

Effect of temperature and pressure of hot pressing on the mechanical properties of PP–HA bio-composites

Effect of temperature and pressure of hot pressing on the mechanical properties of PP–HA bio-composites

Equations of state for polyamide‐6 and its nanocomposites. 1. Fundamentals and the matrix

Effect of dissolved carbon dioxide on the glass transition and crystallization of poly(lactic acid) as probed by ultrasonic measurements

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