Optimization of polyurethane membranes

Melnig, V.; Apostu, Mihai; Ţura, Vasile; Ciobanu, Constantin

doi:10.1016/j.memsci.2005.04.054

Cited by 44 publications

(22 citation statements)

References 22 publications

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“…The transition dipole moment was directed parallel to the hardsegment orientation. 27 The changes in the orientation function of the 1598-cm 21 fundamental with e ( Fig. 10) showed parallel alignment of the transition moments connected with the C¼ ¼C aromatic stretching.…”

Section: Hydrogen Bondingmentioning

confidence: 93%

“…The frequencies of these vibrations are slightly affected by the framework to which a group is bonded. Tentative band assignments were based on the comprehensive analysis of the IR spectra of polyesters, 19 different PUs, [19][20][21][22][23][24][25][26][27] and isocyanates. 22 The observed vibrational bands and their assignments are presented in Table II.…”

Section: Vibrational Assignmentmentioning

confidence: 99%

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Mechanical properties and linear infrared dichroism of thin films of polyurethane nanocomposites

Bistričić

Leskovac

Baranović

et al. 2008

J of Applied Polymer Sci

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Morphological, mechanical, and Fourier transform infrared dichroic investigations were performed on neat polyurethane (PU) polymer matrix and PU1CaCO 3 nanocomposite thin films to determine how the nanofiller influenced the mechanical properties. The measurements were performed on strips that were cut from the prepared films in parallel and perpendicular directions with respect to the direction of film preparation. Optical microscopy of PU and the PU1CaCO 3 nanocomposite revealed the straininduced transition from a continuous spherulitic morphology to a fiberlike structure. The stress-strain behavior of the neat PU and PU1CaCO 3 nanocomposite films showed significant differences at large strain regimes. The experimental results suggest that the mechanical properties were strongly related to the orientational behavior of the separated phases. The orientation of the hard and soft segments was analyzed by the orientation function calculated from the IR absorbances. A correlation between the orientations of segments, tensile properties, and hardness of the investigated polymer films was established.

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Section: Hydrogen Bondingmentioning

confidence: 93%

Section: Vibrational Assignmentmentioning

confidence: 99%

Mechanical properties and linear infrared dichroism of thin films of polyurethane nanocomposites

Bistričić

Leskovac

Baranović

et al. 2008

J of Applied Polymer Sci

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“…Poly(amidohydroxyurethane) PAmHU [528,529] T cp = 57 • C for M n = 18,700 g/mol, c p = 1-3 w/wt% The molecular architecture of studied polymer suggests a coil-to-micelle demixing scenario PAmHU is crystalline 22 …”

Section: Oh O Nmentioning

confidence: 97%

Non-ionic Thermoresponsive Polymers in Water

Aseyev

Tenhu

Winnik

2010

Advances in Polymer Science

457

511

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Numerous non-ionic thermally responsive homopolymers phase separate from their aqueous solutions upon heating. Far fewer neutral homopolymers are known to phase separate upon cooling. A systematic compilation of the polymers reported to exhibit thermoresponsive behaviour is presented in this review, including N-substituted poly[(meth)acrylamide]s, poly(N-vinylamide)s, poly(oxazoline)s, protein-related polymers, poly(ether)s, polymers based on amphiphilic balance, and elastin-like synthetic polymers. Basic properties of aqueous solutions of these polymers are briefly described.

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“…[6] Membranes prepared from commercial block copolymers often exhibit an improved performance, when they are compared with homopolymers. [7,8] Copolymers based on poly(ethylene oxide) (PEO) have been identified as promising membrane materials for CO 2 separation, [9][10][11][12] and therefore, a detailed study of the relationship between the structure of block copolymers and their physical properties is important to tailor a membrane with improved performance for a specific application.…”

Section: Introductionmentioning

confidence: 99%

Tailor‐made Polymeric Membranes based on Segmented Block Copolymers for CO₂ Separation

Car

Stropnik

Yave³

et al. 2008

Adv Funct Materials

236

177

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This paper reports the design of a tailor made polymeric membrane by using poly(ethylene oxide)–poly(butylene terephthalate) (PEO‐PBT) multi‐block copolymers. Their properties are controlled by the fraction of the PEO phase and its molecular weight. To explain the effect of structural changes in copolymer membranes, transport properties of four gases (CO2, H2, N2, and CH4) are discussed. After characterization, the two best copolymers are selected in order to prepare tailor made blends by adding poly(ethylene glycol) (PEG). The best selected copolymer that contained 55 wt. % of 4000 g mol−1 PEO produced a blend with high CO2 permeability (∼190 barrer), which is twice the permeability of the pure copolymer. At the same time, an enhancement of CO2/H2 selectivity is observed (∼13). These results suggest that the morphology of PEO‐PBT can be well controlled by the addition of low‐molecular‐weight PEG, and consequently the gas transport properties can be tuned.

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Optimization of polyurethane membranes

Cited by 44 publications

References 22 publications

Mechanical properties and linear infrared dichroism of thin films of polyurethane nanocomposites

Mechanical properties and linear infrared dichroism of thin films of polyurethane nanocomposites

Non-ionic Thermoresponsive Polymers in Water

Tailor‐made Polymeric Membranes based on Segmented Block Copolymers for CO₂ Separation

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Optimization of polyurethane membranes

Cited by 44 publications

References 22 publications

Mechanical properties and linear infrared dichroism of thin films of polyurethane nanocomposites

Mechanical properties and linear infrared dichroism of thin films of polyurethane nanocomposites

Non-ionic Thermoresponsive Polymers in Water

Tailor‐made Polymeric Membranes based on Segmented Block Copolymers for CO2 Separation

Contact Info

Product

Resources

About

Tailor‐made Polymeric Membranes based on Segmented Block Copolymers for CO₂ Separation