A free-volume study on the phase modifications brought out by e-beam and microwave irradiations in PP/NBR and PVC/SAN blends

Raj, J. M.; Ranganathaiah, C.

doi:10.1016/j.polymdegradstab.2008.11.022

Cited by 22 publications

(12 citation statements)

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“…The impressive use of natural rubber (NR) and NR-based blends as membranes have inspired scientists to conduct various vapor permeation experiments using them [18,19]. The oil resistant property of acrylonitrile butadiene rubber (NBR) has been exploited in a large number of industrial applications [20,21].…”

Section: Introductionmentioning

confidence: 99%

Natural Rubber/Acrylonitrile Butadiene Rubber Blend Membranes: Vapor Permeation Properties

Kumari

Radhakrishnan²,

Unnikrishnan

et al. 2009

Chem Eng & Technol

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Natural rubber (NR)/Acrylonitrile butadiene rubber (NBR) blend membranes, prepared by using dicumyl peroxide as the crosslinking agent, were tested for their vapor permeation characteristics. The permeation studies were conducted using three chlorinated hydrocarbons, viz. dichloro methane, chloroform, and carbon tetrachloride. The effects of the blend ratio, compatibilizer, penetrant size, and temperature on the vapor permeability of the membranes were investigated. The permeability of the blends was found to decrease with an increase in the NBR content, which has been attributed to the inherent solvent resistant nature of NBR. The permeation behavior of compatibilized blends was compared with those of the uncompatibilized blends. The separation efficiencies of the membranes were also tested using chloroform/acetone mixtures to complement the observations from the vapor permeation experiments.

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Section: Introductionmentioning

confidence: 99%

Natural Rubber/Acrylonitrile Butadiene Rubber Blend Membranes: Vapor Permeation Properties

Kumari

Radhakrishnan²,

Unnikrishnan

et al. 2009

Chem Eng & Technol

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“…Several measurements were made for each sample to confirm the reproducibility of the spectrometer. Normally, each spectrum contained more than 10 6 counts, which accumulated in approximately 1.5 to 2 h 27. The measured lifetime spectra were analyzed by the computer program PATFIT88, and the free‐volume cell sizes were calculated with the conventional method 28, 29…”

Section: Methodsmentioning

confidence: 99%

New hyperbranched polymers for membranes of high‐temperature polymer electrolyte membrane fuel cells: Determination of the crystal structure and free‐volume size

Bhadra

Ranganathaiah

Kim

et al. 2011

J of Applied Polymer Sci

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ABSTRACT:The key requirements for a membrane in polymer electrolyte membrane fuel cells are a high ion conductivity, mechanical strength, and barrier properties. We reported earlier on two new promising hyperbranched polymers: poly(benzimidazole-co-aniline) (PBIANI), with a uniform rectangular net structure, and poly(benzimidazole-co-benzene) (PBIB), with a honeycomb structure. Both polymers exhibit a high ion conductivity and mechanical strength and have proven themselves suitable for the membranes of high-temperature polymer electrolyte membrane fuel cells. In this article, we deal with the determination of crystal structure and free-volume cell/ microvoid size of these two polymers. Both PBIANI and PBIB had the same d-spacing (3.5 Å ). However, the percentage of crystallinity was higher and the crystallite size was larger for PBIB. The kinetic diameters of hydrogen (2.89 Å ), oxygen (3.46 Å ), water (2.60 Å ), and methanol ($ 4.00 Å ) were much larger than the free-volume cell/ microvoid diameters of PBIANI (1.81 Å ) and PBIB (1.96 Å ) but much smaller than those of Nafion 115 (6.54 Å ) and polybenzimidazole (PBI) ($ 6.00 Å ). The very small free-volume sizes of PBIANI and PBIB ensured good barrier properties against hydrogen, oxygen, water, and methanol, unlike those of Nafion-and PBI-type membranes. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: [923][924][925][926][927][928][929] 2011

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“…The investigation of dynamic modulus [17]. and damping behavior over a wide range of temperatures and frequencies has proven to be very useful in studying the structural features of polymer blends and the variation of properties with respect to end use applications [45][46][47][48][49][50][51][52]. and damping behavior over a wide range of temperatures and frequencies has proven to be very useful in studying the structural features of polymer blends and the variation of properties with respect to end use applications [45][46][47][48][49][50][51][52].…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

Mechanical and Viscoelastic Characterization of Multiphase Polymer Systems

Varghese

Thomas

2011

Handbook of Multiphase Polymer Systems

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A free-volume study on the phase modifications brought out by e-beam and microwave irradiations in PP/NBR and PVC/SAN blends

Cited by 22 publications

References 20 publications

Natural Rubber/Acrylonitrile Butadiene Rubber Blend Membranes: Vapor Permeation Properties

Natural Rubber/Acrylonitrile Butadiene Rubber Blend Membranes: Vapor Permeation Properties

New hyperbranched polymers for membranes of high‐temperature polymer electrolyte membrane fuel cells: Determination of the crystal structure and free‐volume size

Mechanical and Viscoelastic Characterization of Multiphase Polymer Systems

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