DOI: 10.1002/actp.1994.010450304. Polymer conformational structure and dynamics at the glass transition studied by multidimensional <sup>13</sup>C NMR

Polymer conformational structure and dynamics at the glass transition studied by multidimensional 13C NMR

10.1002/actp.1994.010450304

Crossref journal-article

Wiley

Acta Polymerica (311)

Abstract

AbstractIn a variety of amorphous polymers such as poly(propylene), poly(vinyl acetate) and poly(isobutylene), various backbone conformations are detected by magic‐angle‐spinning (MAS) NMR in the solid state, exploiting the γ‐gauche effect on the isotropic chemical shifts. In poly(propylene), the populations of the conformations are related to specific configurations determined from solution 13C NMR. Above the glass transition temperature, dynamical exchange between the conformations is observed. The non‐exponentiality of the correlation functions and the motional rates are similar of those of the diffuse reorientations observed by 2D exchange NMR with slow MAS or on static samples at the same temperatures. Although trans and gauche define the preferred conformations within the distribution of rotational angles for poly(propylene), the dynamics are not suitably described by motions of the atoms on a diamond lattice. This is demonstrated in particular by the absence of long term orientational memory in 3D exchange NMR experiments. To characterize the nature of the motion further, correlation functions of orders L = 2 and L = 4 have been calculated from 2D exchange spectra without MAS. A behavior intermediate between large‐angle jumps and isotropic rotational diffusion is observed.

Bibliography

Zemke, K., SchmidtâRohr, K., & Spiess, H. W. (1994). Polymer conformational structure and dynamics at the glass transition studied by multidimensional 13C NMR. Acta Polymerica, 45(3), 148â159. Portico.

Authors 3

K. Zemke (first)
K. Schmidt‐Rohr (additional)
H.W. Spiess (additional)

References 56 Referenced 56

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Dates

Type	When
Created	22 years, 4 months ago (April 21, 2003, 2:03 p.m.)
Deposited	1 year, 10 months ago (Oct. 24, 2023, 9:04 p.m.)
Indexed	1 year, 6 months ago (Feb. 7, 2024, 12:22 a.m.)
Issued	31 years, 3 months ago (May 1, 1994)
Published	31 years, 3 months ago (May 1, 1994)
Published Online	22 years, 4 months ago (April 8, 2003)
Published Print	31 years, 3 months ago (May 1, 1994)

Funders 0

None

BibTeX

@article{Zemke_1994, title={Polymer conformational structure and dynamics at the glass transition studied by multidimensional 13C NMR}, volume={45}, ISSN={1521-4044}, url={http://dx.doi.org/10.1002/actp.1994.010450304}, DOI={10.1002/actp.1994.010450304}, number={3}, journal={Acta Polymerica}, publisher={Wiley}, author={Zemke, K. and Schmidt‐Rohr, K. and Spiess, H.W.}, year={1994}, month=may, pages={148–159} }

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