High-resolution solid-state 13C nuclear magnetic resonance study of the combined process of 1H spin diffusion and 1H spin-lattice relaxation in semicrystalline polymers

Kimura, Tomoya; Neki, Kazuya; Tamura, Nobukatsu; Horii, Fumitaka; Nakagawa, Masaru; Odani, Hisashi

doi:10.1016/0032-3861(92)90724-b

Cited by 47 publications

(117 citation statements)

References 13 publications

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“…Since it was first introduced by Goldman and Shen, 2 spin diffusion has been exploited by several research groups [3][4][5][6][7][8] to investigate the microphase structures in multiphase solid polymers. Polymers which display both crystalline and amorphous phases, 3,4,6,7 polymer blends, 5,9 block copolymers, 8,10,11 and core-shell polymers 12 have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Polymers which display both crystalline and amorphous phases, 3,4,6,7 polymer blends, 5,9 block copolymers, 8,10,11 and core-shell polymers 12 have been investigated. Most of the above studies were based on the differences in molecular mobility in different phases.…”

Section: Introductionmentioning

confidence: 99%

“…8,9,14 The determination of domain sizes and interfacial thickness by spin diffusion is generally carried out through computer simulation. [6][7][8]15 Models that capture the essence of the spin diffusion process have been proposed. Packer and coworkers 6 discussed the spin diffusion and spin-lattice relaxations in a multiphase homopolymer.…”

Section: Introductionmentioning

confidence: 99%

“…Packer and coworkers 6 discussed the spin diffusion and spin-lattice relaxations in a multiphase homopolymer. Kimura et al 7 simulated the 13 C NMR spectra in uniaxially oriented polyethylene films considering both spin diffusion and spin-lattice relaxation processes. The model used is limited to a lamellar geometry.…”

Section: Introductionmentioning

confidence: 99%

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Spin diffusion and spin-lattice relaxation in multiphase polymers

Wang

Jack

Natansohn

1997

The Journal of Chemical Physics

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Reuse of AIP Publishing content is subject to the terms: https://publishing.aip.org/authors/rights-and-permissions. A model which treats spin diffusion and spin-lattice relaxation in multiphase polymers on the same footing is proposed. This new approach allows for more accurate determination of domain sizes and interfacial thickness in the probed polymers. In a poly͑styrene-b-isoprene͒ copolymer example a significant improvement in the agreement between the NMR measurements and the simulated results can be obtained with the incorporation of a spin-lattice relaxation term into the spin diffusion process. The obtained microphase structural parameters are similar to the small angle X-ray scattering results. In addition, the spin-lattice relaxation times ͑T 1 ) in different domains can be predicted reasonably well based on T 1 s of the component homopolymers and on the microphase structure in the present model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spin diffusion and spin-lattice relaxation in multiphase polymers

Wang

Jack

Natansohn

1997

The Journal of Chemical Physics

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“…Materials An amount of 3.1 g of poly([ - 13 C]styrene-co- [1,[4][5][6][7][8][9][10][11][12][13] C2]maleic anhydride) with 27 wt % [1,4-13 C2] MA (Mw ≈ 4 × 10 4 g/mol) was prepared using an optimized starved feed procedure. 6 The MA content of the copolymer is 27.0 wt %, as was determined from the ratio of the FT-IR intensities of the 13 CO stretch absorption at 1807 cm -1 and the 13 CH2 bend † Leiden Institute of Chemistry.…”

Section: Methodsmentioning

confidence: 99%

Cross-Linking Induced Phase Separation in SAN/SMA Semi-interpenetrating Polymer Networks Observed by Solid State NMR and Site Specific Isotope Enrichment

et al. 2000

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The effect of selective cross-linking of poly(styrene-co-maleic anhydride) (SMA) in an initially fully miscible blend with poly(styrene-co-acrylonitrile) (SAN) is studied as a function of cross-link density.Site specific 13 C-enriched SMA and SAN obtained by total synthesis and CP 3 magic angle spinning NMR spin diffusion techniques are used. The cross-linking of SMA results in the formation of a semiinterpenetrating network (semi-IPN) and induces phase separation. The characteristic domain sizes increase roughly linear with the amount of cross-links on a scale of 0-100 nm. The fraction of SAN and SMA that remains homogeneously mixed is also determined, and it is shown to decrease with increasing cross-link density.

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Controls exerted by the Aib residue: Helix formation and helix reversal This article is a US Government work and, as such, is in the public domain in the United States of America.

Karle

2001

Biopolymers

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Background Digital time‐lapse microscopy using Nomarski‐DIC requires that an autofocusing system adapt to changes in cell shape, size, and position while contending with drift, noise, and hysteresis in the microscope and imager. We have designed and implemented an autofocusing system that tracks subjects under dynamic conditions and maintains focus within a threshold of discriminability. Methods With the use of proven and novel algorithms for autofocusing in Nomarski, we performed “virtual” experiments on recorded image stacks to simulate drift and sudden displacements and test the search algorithm response. Results We found that combining a simple [1, −1] contrast function with an adaptive “warmer–colder” focusing algorithm yields a reasonable compromise between focusing precision and noise tolerance. This method was implemented to record growth kinetics of yeast cells in single and multiple fields of view over several hours. Conclusions We have implemented a robust digital autofocus that maintains focus on optically complex samples imaged at high resolution. The tolerance of this system of drift and vibration suggests that it is a practical system for time‐lapse imaging in many biological applications. Cytometry 49:159–169, 2002. © 2002 Wiley‐Liss, Inc.

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High-resolution solid-state 13C nuclear magnetic resonance study of the combined process of 1H spin diffusion and 1H spin-lattice relaxation in semicrystalline polymers

Cited by 47 publications

References 13 publications

Spin diffusion and spin-lattice relaxation in multiphase polymers

Spin diffusion and spin-lattice relaxation in multiphase polymers

Cross-Linking Induced Phase Separation in SAN/SMA Semi-interpenetrating Polymer Networks Observed by Solid State NMR and Site Specific Isotope Enrichment

Controls exerted by the Aib residue: Helix formation and helix reversal This article is a US Government work and, as such, is in the public domain in the United States of America.

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