2010
DOI: 10.1021/ma1003248
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Confinement Effects on Chain Dynamics and Local Chain Order in Entangled Polymer Melts

Abstract: Introduction. Effects of nanometric confinement on polymer structure and dynamics have been in the focus for more than 15 years, primarily with the aim of providing the physical understanding for nanoscale polymer applications such as in composite materials. Changes in T g are probably the most researched, but still controversial issue, with clear and intuitively expected indications of slowed-down segmental dynamics for the case of strongly absorbing surfaces but sometimes conflicting trends and a lack of und… Show more

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Cited by 58 publications
(63 citation statements)
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“…It appears that the confinement effect becomes smaller for lower temperatures, which is in agreement with our previous DQ NMR data. 11 For bulk PB at 293 K the three power-law regimes for T 1 (ν) described by Kimmich and Fatkullin 1 (and marked in Figure 2 by solid black lines) well reproduce our data. In addition, we show in Figure 2 the prediction of the tube-reptation model (regime II) which according to the corset effect is assumed to hold in confinement.…”
supporting
confidence: 84%
See 2 more Smart Citations
“…It appears that the confinement effect becomes smaller for lower temperatures, which is in agreement with our previous DQ NMR data. 11 For bulk PB at 293 K the three power-law regimes for T 1 (ν) described by Kimmich and Fatkullin 1 (and marked in Figure 2 by solid black lines) well reproduce our data. In addition, we show in Figure 2 the prediction of the tube-reptation model (regime II) which according to the corset effect is assumed to hold in confinement.…”
supporting
confidence: 84%
“…The present contribution addresses this problem directly, using the same method but for another well-defined model nanocomposite as in ref 11.…”
Section: ' Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…14,15 Since the truncated-mode fraction found by NSE for PEO on silica 14,15 pertains to the NMR-detected mobile majority fraction, we should mention that more in-depth studies of this fraction by NMR require a more advanced (multiplequantum) method. 33,34 For the system with larger particles and longer chains, this method has provided the quantification of a fraction of entropically active bridging chains between the particles. 13 Thus, in-depth comparisons of neutron-scattering and NMR data on the same samples will help to develop an improved understanding of confinement effects.…”
Section: F Comparison Of Nmr and Neutron-scattering Resultsmentioning
confidence: 99%
“…The general tendency in such layered confinement structures is that confinement leads to a more anisotropic character of segment reorientation so that the orientation correlation function decays more slowly at least as concerns its long-time tail [102]. Polybutadiene confined in anodic aluminum oxide matrices (20 and 60 nm) and polydimethylsiloxane restrained to emulsion droplets (200-1,000 nm) were studied with the aid of multiple-quantum build-up NMR spectroscopy [103]. Evidence for geometrical confinement effects on polymer chain dynamics independent of the chain length was also observed with the aid of dielectric relaxation spectroscopy [104,105].…”
Section: Experimental Results For Techniques Sensitive To Orientationmentioning
confidence: 99%