Morphology and physical properties of poly(styrene-b-isobutylene-b-styrene) block copolymers

Storey, Robson F.; Chisholm, Bret J.; Masse, Michael A.

doi:10.1016/0032-3861(96)89388-8

Cited by 64 publications

(61 citation statements)

References 36 publications

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“…The figure also shows the segmental molecular weights of the samples. The samples are expected to be in a phase-separated state at the testing temperature as Storey et al 22 reported on the persistence of separate phases for PSt-b-PIB-b-PIB up to ϳ 265°C.…”

Section: Star-block Polymers Of Multiple Polystyrene-b-polyisobutylenmentioning

confidence: 96%

Star-block polymers of multiple polystyrene-b-polyisobutylene arms radiating from a polydivinylbenzene core

Asthana

Kennedy

1999

J. Polym. Sci. A Polym. Chem.

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Section: Star-block Polymers Of Multiple Polystyrene-b-polyisobutylenmentioning

confidence: 96%

Star-block polymers of multiple polystyrene-b-polyisobutylene arms radiating from a polydivinylbenzene core

Asthana

Kennedy

1999

J. Polym. Sci. A Polym. Chem.

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“…Several reports on the morphology and physical properties of proton conducting membranes based on the polystyrene-containing block copolymers have been published. These include partially sulfonated poly(styrene-b-[ethylene-co-butylene]-b-styrene) (S-SEBS), [8][9][10][11][12][13][14][15][16] sulfonated poly(styrene-b-isobutylene-b-styrene) (S-SIBS), [17][18][19][20][21] sulfonated hydrogenated poly(butadiene-b-styrene) (S-HPBS), 22,23 sulfonated poly-(styrene-b-ethylene-alt-propylene) (S-SEP), 24,25 and poly-(styrene-b-ethylene/propylene-b-styrene) (S-SEPS) copolymer. 24 In related block copolymer studies, graft copolymers of PS-g-macPSSA show enhanced conductivity compared to that of random copolymers of styrene and styrenesulfonic acid (PS-r-PSSA).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Proton Conductivity of Partially Sulfonated Poly([vinylidene difluoride-co-hexafluoropropylene]-b-styrene) Block Copolymers

2005

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=aeb1ea6c-9c47-4565-9a16-283705ab0182 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=aeb1ea6c-9c47-4565-9a16-283705ab0182 Synthesis and Proton Conductivity of Partially Sulfonated Poly([vinylidene difluoride-co-hexafluoropropylene]-b-styrene) Block CopolymersZhiqing Shi and Steven Holdcroft* Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada, and Institute for Fuel Cell Innovation, National Research Council (NRC), 3250 East Mall, Vancouver, BC V6T 1W5, Canada Received November 2, 2004; Revised Manuscript Received February 18, 2005 ABSTRACT: A series of novel, amphiphilic block copolymers comprising of sulfonated poly([vinylidene difluoride-co-hexafluoropropylene]-b-styrene) [P(VDF-co-HFP)-b-SPS] were synthesized. The numberaverage molecular weights of the fluorous and polystyrene segments were 17 900 and 8100 g/mol, respectively. Sulfonation of the polystyrene segment to different extents provided a series of polymers which were cast into films to yield proton exchange membranes with varying ion exchange capacity (IEC). Proton conductivity of the membranes increased significantly when the IEC was increased from 0.5 to 1.2 mmol/g. For 0.9-1.2 mmol/g IEC membranes, the conductivity was similar to Nafion 117, significantly higher than random copolymers of polystyrene and sulfonated polystyrene, and twice that of nonfluorous block copolymer membranes based on sulfonated poly(styrene-b-[ethylene-co-butylene]-b-styrene) (S-SEBS) and sulfonated hydrogenated poly(butadiene-b-styrene) (S-HPBS) copolymers. TEM revealed a disruption in ordered morphology with increasing degree of sulfonation. Morphological structures of membranes having 0.6-1.2 mmol/g IEC comprised of interconnected networks of ion channels, each of 8-15 nm width.

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“…In fact, the tensile properties of the SIBS nanofibre during the first stretch resemble those of thermoplastic elastomers that have a higher volume fraction of glassy polymer resulting in a continuous phase of glassy polymer rather than the equilibrium isolated spherical domains of the SIBS used here. 83,84 It is possible that the electrospinning process produces an unusual, non-equilibrium microstructure of continuous PS phase with dispersed rubbery domains. During tensile extension, these glassy PS regions yield and break-up to form a discontinuous phase which then resembles the typical equilibrium structure of SIBS.…”

Section: Resilience Of Thermoplastic Elastomer Nanofibresmentioning

confidence: 99%

Tensile testing of individual glassy, rubbery and hydrogel electrospun polymer nanofibres to high strain using the atomic force microscope

et al. 2013

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The production and use of polymer nanofibre assemblies prepared by electrospinning is now widespread. It is known that the tensile properties of electrospun polymer fibres can be different to those of bulk polymers. Here, we report a general method for measuring the tensile properties of individual electrospun nanofibres that employs a commercial atomic force microscope. Methods for preparing samples, force calibration and calculation of tensile stress and strain are described along with error estimation. By appropriate choice of AFM cantilever, it is shown that the tensile stress-strain curves can be measured for glassy, rubbery and gel polymer nanofibres. Testing can be in air or fluid and to strains of 300%. Example results illustrate the usefulness of the technique with the observation of high ductility in normally brittle glassy polymers such as polystyrene, and unusually large hysteresis in thermoplastic elastomer nanofibres. These observations provide new insights into the structure and mechanical behaviour of nanoscale polymeric materials. 2013 Elsevier Ltd. All rights reserved. AbstractThe production and use of polymer nanofibre assemblies prepared by electrospinning is now

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Morphology and physical properties of poly(styrene-b-isobutylene-b-styrene) block copolymers

Cited by 64 publications

References 36 publications

Star-block polymers of multiple polystyrene-b-polyisobutylene arms radiating from a polydivinylbenzene core

Star-block polymers of multiple polystyrene-b-polyisobutylene arms radiating from a polydivinylbenzene core

Synthesis and Proton Conductivity of Partially Sulfonated Poly([vinylidene difluoride-co-hexafluoropropylene]-b-styrene) Block Copolymers

Tensile testing of individual glassy, rubbery and hydrogel electrospun polymer nanofibres to high strain using the atomic force microscope

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