Study on the morphology and gas permeation property of polyurethane membranes

Sadeghi, Morteza; Semsarzadeh, Mohammad Ali; Barikani, Mehdi; Ghalei, Behnam

doi:10.1016/j.memsci.2011.09.024

Cited by 95 publications

(83 citation statements)

References 21 publications

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“…No significant change in the soft segment T g was observed regardless of the silica size or the amount of incorporation. This phenomenon, which was also observed by several researchers [27,30,42,45], indicates no change in the soft segment mobility in the presence of silica particles dispersed in the polymeric matrix. Based on the interaction between the soft segments and silica nanoparticles that was evidenced by FTIR and homogeneous random distribution of the particles by SEM analyses, a decrease in the segmental mobility was expected.…”

Section: Thermal Analyses By Dsc and Tgasupporting

confidence: 81%

Polyurethaneurea–silica nanocomposites: Preparation and investigation of the structure–property behavior

Malay

Oğuz

Kosak

et al. 2013

Polymer

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a b s t r a c tNanocomposites consisting of thermoplastic polyurethaneeurea (TPU) and silica nanoparticles of various size and filler loadings were prepared by solution blending and extensively characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), thermal analysis, tensile tests, and nanoindentation. TPU copolymer was based on a cycloaliphatic diisocyanate and poly(tetramethylene oxide) (PTMO-2000) soft segments and had urea hard segment content of 20% by weight. TPU/silica nanocomposites using silica particles of different size (29, 74 and 215 nm) and at different loadings (1, 5, 10, 20 and 40 wt. %) were prepared and characterized. Solution blending using isopropyl alcohol resulted in even distribution of silica nanoparticles in the polyurethaneeurea matrix. FTIR spectroscopy indicated strong interactions between silica particles and polyether segments. Incorporation of silica nanoparticles of smaller size led to higher modulus and tensile strength of the nanocomposites, and elastomeric properties were retained. Increased filler content of up to about 20 wt. % resulted in materials with higher elastic moduli and tensile strength while the glass transition temperature remained the same. The fracture toughness increased relative to neat TPU regardless of the silica particle size. Improvements in tensile properties of the nanocomposites, particularly at intermediate silica loading levels and smaller particle size, are attributed to the interactions between the surface of silica nanoparticles and ether linkages of the polyether segments of the copolymers.

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Section: Thermal Analyses By Dsc and Tgasupporting

confidence: 81%

Polyurethaneurea–silica nanocomposites: Preparation and investigation of the structure–property behavior

Malay

Oğuz

Kosak

et al. 2013

Polymer

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“…The fact that the solution mechanism prevailed indicates that the PU and PU-Al 2 O 3 nanocomposite membranes exhibit rubber properties. The abovementioned results were observed in our previous works [11,34]. We have shown that the rubber properties of the PU membranes decrease by phase interferences in the PUs.…”

Section: Gas Permeationsupporting

confidence: 78%

Enhancement of the gas separation properties of polyurethane membranes by alumina nanoparticles

Ameri

Sadeghi

Zarei

et al. 2015

Journal of Membrane Science

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107

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“…However, a different trend was observed for CO 2 permeability. Previous studies on polyurethane membranes have demonstrated a restriction in diffusion pathways by polyurethanes due to an increase in the interactions between soft and hard segments [54,58]. In our study, He permeability also confirmed that microphase separation of hard and soft segments, can significantly affect the diffusion pathways for gas transport.…”

Section: Gas Permeationsupporting

confidence: 87%

“…Sadeghi et al [58] studied the effect of hard segments on the microphase separation and gas permeation properties of polyurethane membranes and reported that gas permeability increases with phase separation. We also expected the permeability values for all gases to show increasing trends with enhancing phase separation in PU15 and PU20, compared to PU10.…”

Section: Gas Permeationmentioning

confidence: 99%