Structure and gas permeability of siloxane-imide block copolymer membranes: 1. Effect of siloxane content

Tsujita, Yoshiharu; Yoshimura, Kimio; Yoshimizu, Hiroaki; Takizawa, Akira; Kinoshita, Takatoshi; Furukawa, Masaya; Yamada, Yasuharu; Wada, Kazumi

doi:10.1016/0032-3861(93)90595-2

Cited by 36 publications

(24 citation statements)

References 21 publications

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“…5,[45][46][47][48] Many of these studies incorporate silicone-based monomers in polypyrrolones and polyimides to inhibit intersegmental packing. Zhou et al 5 incorporated the bulky bis(phthalic anhydride)dimethylsilane (SiDA) monomer in varying fractions to a polypyrrolone series.…”

Section: Gas Transport Property Correlation With Polymer Chemical Strmentioning

confidence: 99%

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Zimmerman

Koros

1999

J. Polym. Sci. B Polym. Phys.

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Section: Gas Transport Property Correlation With Polymer Chemical Strmentioning

confidence: 99%

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Zimmerman

Koros

1999

J. Polym. Sci. B Polym. Phys.

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“…Polyimides with polysiloxane soft blocks were studied in this respect as a function of siloxane content. [152] Instead of polyethers or polysiloxanes, Jonquieres et al used polyurethane soft blocks in poly(urethane imides) and showed the possibility to separate an azeotropic mixture of ethanol and ethyl-t-butylether. [153] A general problem in the preparation of block copolymer based membranes is the orientation of their microdomains on a macroscopic scale.…”

Section: Reviewsmentioning

confidence: 99%

Developments in Membrane Research: from Material via Process Design to Industrial Application

et al. 2006

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The aim of this review paper is to give an overview of the research activities of GKSS in the field of polymer based membranes. After summarizing the historic development of membrane science at GKSS, it describes different classes of polymeric materials for membranes, and the characterization of membranes. The design of membrane‐based separation processes followed by examples of applications will also be presented. In the last chapter we will try to give an outlook for the future activities in membrane research.

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“…However, drawbacks of PI include high moisture absorption (∼ 4 wt %) and coefficient of thermal expansion (∼ 50 ppm/K), shortcomings that are preventing its widespread use as an electronic material. One proposed approach to address these deficiencies is the addition of inorganic filling material such as SiO 2 1–3…”

Section: Introductionmentioning

confidence: 99%

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO₂ nanocomposites

Chang

Lee

2010

J of Applied Polymer Sci

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In this study, we investigated the influence of frequency, film thickness, and SiO 2 content on the dielectric constant (K) and loss tangent (tan d) of liquid crystalline polyimide (LCPi) and liquid crystalline polyimide/SiO 2 (LCPi/SiO 2 ) nanocomposites in a high frequency environment. We tested the loss tangent of the LCPi and LCPi/SiO 2 nanocomposites within the high frequency 1 MHz to 3 GHz range, and determined its value to be between 0.01 and 0.001. In addition, we found a formant for frequencies ranging from 0.5 GHz to 1 GHz. We also inferred from the dielectric loss graphs of films with different thicknesses that the formants of the loss tangent shifted toward higher frequencies with increasing thicknesses. When measuring the dielectric constant at high frequencies, we found that the dielectric constant decreased markedly with increased SiO 2 contents. Using the dielectric constant of high-frequency circuit board materials as the standard, the dielectric constant of the LCPi/SiO 2 nanocomposites at the frequency range from 1 MHz to 3 GHz was found to be as high as 2.2-3.4, thereby confirming the viability of LCPi/ SiO 2 nanocomposites as candidate materials for high-frequency circuit board. In addition, the volume resistivity (q V ) of the LCPi and LCPi/SiO 2 nanocomposites also increased with increased SiO 2 contents.

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Structure and gas permeability of siloxane-imide block copolymer membranes: 1. Effect of siloxane content

Cited by 36 publications

References 21 publications

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Developments in Membrane Research: from Material via Process Design to Industrial Application

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO₂ nanocomposites

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Structure and gas permeability of siloxane-imide block copolymer membranes: 1. Effect of siloxane content

Cited by 36 publications

References 21 publications

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Developments in Membrane Research: from Material via Process Design to Industrial Application

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO2 nanocomposites

Contact Info

Product

Resources

About

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO₂ nanocomposites