Dependence of Order and Dynamics in Polymers and Elastomers under Deformation Revealed by NMR Techniques

• Authors: S. Stapf , S. Kariyo
• Languages of publication: EN

Abstracts

EN

Uniaxial stretching and swelling are considered as two limiting cases of deformations of elastomers. Under both conditions, the molecular dynamics is changed with respect to the behavior that describes the undisturbed, equilibrium elastomer. Particularly the spectrum of segmental motions, which reveals itself in the frequency-dependence of the longitudinal NMR relaxation time, is discussed in this study, but also order effects expressed via the dipolar coupling strength are investigated. For stretched elastomers, a significant change of the relaxation dispersion is found for three different types of rubber; it is a consequence of a change of the mode spectrum of segmental motions that becomes obvious at low frequencies (below 1 MHz at room temperature). In swollen elastomers, on the other hand, a cross-over towards a behavior expected for semi-dilute solutions is found, and a comparison to solutions of uncross-linked polymers reveals a significant effect of the cross-links only in the kHz range. A much more pronounced difference between elastomers and polymer solutions, however, is found from double-quantum encoded NMR measurements where the residual order introduced by the presence of permanent cross-links is maintained even in the presence of solvent.

Keywords

EN

81.05.Lg; 82.35.Lr; 76.60.-k; 61.25.Hq; 36.20.Ey; 81.40.Lm

Discipline

• 76.60.-k: Nuclear magnetic resonance and relaxation(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics and 82.56.-b Nuclear magnetic resonance in physical chemistry and chemical physics; for structure determination using magnetic resonance techniques, see 61.05.Qr; for biophysical applications, see 87.80.Lg; for NMR in superconducting materials, see 74.25.nj)
• 82.35.Lr: Physical properties of polymers
• 36.20.Ey: Conformation (statistics and dynamics)
• 81.05.Lg: Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials(for polymers and organic materials in electrochemistry, see 82.45.Wx)
• 81.40.Lm: Deformation, plasticity, and creep(see also 83.50.-v Deformation and flow in rheology)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 247-259

Dates

published

2005-08

received

2005-04-24

Contributors

author

S. Stapf

• Lehrstuhl für Makromolekulare Chemie and Magnetic Resonance Center MARC, ITMC, RWTH, Aachen, Germany

author

S. Kariyo

• Lehrstuhl für Makromolekulare Chemie and Magnetic Resonance Center MARC, ITMC, RWTH, Aachen, Germany

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Identifiers

DOI

10.12693/APhysPolA.108.247