Zobrazeno 1 - 10
of 177
pro vyhledávání: '"Wen Yang. Wen"'
Publikováno v:
Macromolecules. 40:1521-1528
The structural influence on translational diffusion of 2,2,4-trimethylpentane (TMP) through SEBS triblock polymer (poly(styrene)-block -poly(ethene-co-but-1 -ene)-block -poly(styrene)) was studied using pulse field gradient (PFG) NMR coupled with lat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7791e483e21de030e895bb6e38995446
https://doi.org/10.1021/ma062619c
https://doi.org/10.1021/ma062619c
Publikováno v:
Journal of Membrane Science. 269:118-125
Proton and sodium-23 spectra are reported on acid and sodium neutralized forms of the perfluorosulfonate ionomer (Nafion), respectively. This local structural view is compared with pulse field gradient diffusion measurements of water, methanol and di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::347e7bba8dbd214419a083f659d3167f
https://doi.org/10.1016/j.memsci.2005.06.026
https://doi.org/10.1016/j.memsci.2005.06.026
Publikováno v:
Macromolecules. 38:3754-3764
Diffusion of pentane, cyclohexane, and toluene in nanocomposite films of fumed silica and poly(2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole-co-tetrafluoroethylene) is observed by pulse field gradient NMR. The apparent diffusion constant determin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8034187003685cd4a83bad67f578e762
https://doi.org/10.1021/ma047880c
https://doi.org/10.1021/ma047880c
Publikováno v:
Macromolecules. 36:4397-4403
Fluorine-19 NMR was used to study the structure and mobility of the perfluorosulfonate ionomer Nafion (Dupont trademark) in the presence of dimethyl methylphosphonate (DMMP). Fluorine- 19 resonances arising from the ionomeric side chain narrowed rapi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c967aba05134b7a912c7cd6d880060c1
https://doi.org/10.1021/ma021777a
https://doi.org/10.1021/ma021777a
Autor:
Ghirmai Meresi, Wen-Yang Wen, A. A. Jones, Jaimie Gosselin, Paul T. Inglefield, Yingzi Wang, David Azar
Publikováno v:
Macromolecules. 34:6680-6683
Pulse field gradient diffusion measurements were made on the decafluoropentane molecule, CF3CHFCHFCF2CF3, in the copolymer of tetrafluoroethylene (TFE) and 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole (BDD). The proton spectrum consisted of two
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b686d2712d6e2bf78114957df65cac2
https://doi.org/10.1021/ma010724a
https://doi.org/10.1021/ma010724a
Autor:
Wen-Yang Wen, A. A. Jones, A Tao, Yingzi Wang, Ghirmai Meresi, Athinodoros Bandis, X Gong, Paul T. Inglefield
Publikováno v:
Polymer. 42:6485-6492
Self-diffusion constants for water, ethanol and decafluoropentane were measured in the perfluorosulfonate ionomer NafionR using pulse field gradient proton NMR. Measurements were made as a function of concentration, temperature and diffusion time. Fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1e2ba13214d15a71bae79f7b2a86bfe
https://doi.org/10.1016/s0032-3861(01)00119-7
https://doi.org/10.1016/s0032-3861(01)00119-7
Autor:
Yingzi Wang, Wen-Yang Wen, Athinodoros Bandis, Paul T. Inglefield, Ghirmai Meresi, A. A. Jones
Publikováno v:
Polymer. 42:6153-6160
At magic angle spinning speeds above 5 kHz, two major fluorine-19 resonances can be resolved in the acid form of the perfluorosulfonate ionomer Nafion (DuPont trademark). The larger signal at −120 ppm versus CFCl3 is assigned to the backbone CF2 gr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ac0d393014e873b3d8863bfe4561b6d
https://doi.org/10.1016/s0032-3861(01)00053-2
https://doi.org/10.1016/s0032-3861(01)00053-2
Publikováno v:
Solid State Nuclear Magnetic Resonance. 12:153-164
The morphology of an ionomeric polymer blend consisting of an amino-silicone copolymer and zinc neutralized sulfonated polystyrene (ZnSPS) has been studied using proton spin diffusion and small angle X-ray scattering (SAXS). The extent of reaction be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3556f5b074494ec02434e4524026c87
https://doi.org/10.1016/s0926-2040(98)00059-9
https://doi.org/10.1016/s0926-2040(98)00059-9
Publikováno v:
Macromolecules. 29:2138-2142
A new experimental approach for measuring diffusion coefficients of sorbed gas in polymers has been developed based on a combination of NMR spectroscopy and the use of polymer microspheres. The system chosen to demonstrate the technique is xenon gas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b977bd832546f2450e84b7904c62d6bd
https://doi.org/10.1021/ma951213p
https://doi.org/10.1021/ma951213p
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 33:1495-1503
The self-diffusion coefficients of toluene in polyisobutylene (PIB) solutions were determined using the pulsed field gradient nuclear magnetic resonance technique. The volume fraction of toluene in the polymer was varied from 0.045 up to 0.712 and th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::abe396e6135399ce7bb19b6ffccdc538
https://doi.org/10.1002/polb.1995.090331006
https://doi.org/10.1002/polb.1995.090331006