Comparison of methods for characterizing microporous membranes for plasma separation

Sakai, Kiyotaka; Ozawa, K; Mimura, Rishichi; Ohashi, Hidehiko

doi:10.1016/s0376-7388(00)81570-7

Cited by 28 publications

(10 citation statements)

References 7 publications

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“…A probability plot correlation coefficient hypothesis testing method was used to obtain the pore size distribution function. 24,25 The pore size data were first assumed to follow a theoretical distribution function. Then, the data were plotted against the theoretical distribution in such a way that the points formed approximately a straight line, which is the so-called probability plot.…”

Section: Pore Structure Characterizationmentioning

confidence: 99%

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Pore structure and glass transition temperature of nanoporous poly(ether imide)

Liu

Ozisik

Siegel

2006

J Polym Sci B Polym Phys

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The effect of nanopores on the glass transition temperature (T g ) of poly (ether imide) was studied with differential scanning calorimetry. Nanoporous poly (ether imide) samples were obtained through the phase separation of immiscible blends of poly(ether imide) and polycaprolactone diol and by the removal of the dispersed minor phase domains with a selective solvent. Microscopy and statistical methods were used to characterize the pore structure and obtain the pore structure parameters. The pore size was found to depend on the processing time and the initial blend composition, mainly because of phase-coarsening kinetics. A decrease in T g was observed in the nanoporous poly(ether imide) in comparison with the bulk samples. The change in T g was strongly influenced by the pore structure and was explained by the percolation theory.

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Section: Pore Structure Characterizationmentioning

confidence: 99%

“…In practice, if the correlation coefficient is greater than 0.9, the distribution function is accepted to represent the data successfully. 25 The distribution parameters can be estimated from the intercept and slope of the probability plot.…”

Section: Pore Structure Characterizationmentioning

confidence: 99%

Pore structure and glass transition temperature of nanoporous poly(ether imide)

Liu

Ozisik

Siegel

2006

J Polym Sci B Polym Phys

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“…The number and weight average molecular weight of PEI is 12,000 and 30,000 g/mol, respectively. The density of PEI is 1.28 g/cm 3 . PCLD was purchased from Aldrich Corporation.…”

Section: Methodsmentioning

confidence: 99%

“…PCLD was purchased from Aldrich Corporation. The number average molecular weight of PCLD is 530 g/mol and its density is 1.073 g/cm 3 . Dichloromethane (DCM) was used as the common solvent to dissolve both PCLD and PEI to prepare a polymer blend solution for spin-coating.…”

Section: Methodsmentioning

confidence: 99%

“…Various characterization methods can be used for this purpose, such as mercury injection, gas sorption, permeation test, and optical methods (direct observation). [2][3][4][5] Most of these methods characterize the pore structure by determining various macroscopic properties, which are unique to the pore structure. 2 Pore structure models are then used to estimate average parameters.…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous Polymer Films from Immiscible Polymer Blends: Pore Size and Composition Dependence

2004

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Nanoporous polymer films have been prepared using immiscible blends of polyetherimide (PEI) and poly(caprolactone diol) (PCLD). The films were prepared by spin-coating from a common solvent -dichloromethane (DCM). To create the nanoporous films, PCLD was removed by immersing the films in acetone, which dissolves PCLD only. Field emission scanning electron microscopy was used to study the porous structure. The pore structure of the films was affected by many factors such as composition of the blend, molecular weight, and various processing parameters. The formation of nanometer size pores was mainly due to the fast phase separation process during spin-coating. The pore size and pore size distribution was found to depend on the blend composition.

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