Relaxation in Poly(alkyl methacrylate)s: Crossover Region and Nanophase Separation

Beiner, Mario

doi:10.1002/1521-3927(20010801)22:12<869::aid-marc869>3.0.co;2-r

Cited by 118 publications

(28 citation statements)

References 80 publications

(178 reference statements)

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“…Due to the different temperature dependences of their relaxation times, however, they tend to merge when these timescales attain the same order of magnitude. At high temperatures/frequencies, only one process is observable, known as the a-process (sometimes also α β-process) [11]. Though great efforts have been made to illuminate the molecular mechanisms in the merging region (sometimes also called the splitting region), the details of this phenomenon are far from being understood [1]- [3], [11]- [13].…”

Section: Introductionmentioning

confidence: 55%

Comparison of mechanical and dielectric relaxation processes in laser-deposited poly(methyl methacrylate) films

et al. 2006

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Section: Introductionmentioning

confidence: 55%

Comparison of mechanical and dielectric relaxation processes in laser-deposited poly(methyl methacrylate) films

et al. 2006

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“…[1][2][3] Moreover, it has been shown that increasing the size of side groups has a deep impact on the structure and dynamics of polymers. Of particular interest is the family of poly(nalkyl-methacrylates), 2,[4][5][6][7][8][9][10][11][12] where x-ray and neutron diffraction analysis show that nanosegregation occurs between backbone and side groups.…”

Section: Introductionmentioning

confidence: 99%

Study of the structure and dynamics of poly(vinyl pyrrolidone) by molecular dynamics simulations validated by quasielastic neutron scattering and x-ray diffraction experiments

Busselez

Arbe

Álvarez

et al. 2011

The Journal of Chemical Physics

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Oxygen and nitrogen plasma hydrophilization and hydrophobic recovery of polymers Biomicrofluidics 6, 016501 (2012) Interferometric scanning microscopy for the study of disordered materials Appl. Phys. Lett. 99, 251912 (2011) (Electro)mechanical behavior of selectively solvated diblock/triblock copolymer blends Appl. Phys. Lett. 99, 242901 (2011) Statics of polymer droplets on deformable surfaces J. Chem. Phys. 135, 214703 (2011) Interactions between polymer brush-coated spherical nanoparticles: The good solvent case J. Chem. Phys. 135, 214902 (2011) Additional information on J. Chem. Phys. Quasielastic neutron scattering, x-ray diffraction measurements, and fully atomistic molecular dynamics simulations have been performed on poly(vinylpyrrolidone) homopolymer above its glass transition temperature. A "prepeak" appears in the x-ray diffraction pattern that shows the typical features of a first amorphous halo. From an effective description of the experimentally accessed incoherent scattering function of hydrogens in terms of a stretched exponential function, we observe enhanced stretching and a momentum-transfer dependence of the characteristic time different from that usually reported for more simple polymers (main-chain polymers or polymers with small side groups). The comparison with both kinds of experimental results has validated the simulations. The analysis of the simulated structure factor points to a nanosegregation of side groups (SG) and mainchains (MC). The detailed insight provided by the simulations on the atomic trajectories reveals a partial and spatially localized decoupling of MC and SG dynamics at length scales between the average SG-SG distance and the characteristic length of the backbone interchain correlations. Anomalous behavior in correlators calculated for the SG subsystem are found, like e.g., logarithmiclike decays of the density-density correlation function. They might be a consequence of the existing large dynamic asymmetry between SG and MC subsystems. Our results suggest that, as the SGs are spatially extended and chemically different from the backbone, they form transient nanosegregated domains. The dynamics of these domains show similar behavior to that found in other systems displaying large dynamic asymmetry.

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“…This phenomenon in long side chain poly(alkylmethacrylate)s is discussed in terms of the dispersion of polyethylene-like nano-domains [13]. In a Brillouin study on poly(methylphenylsiloxane) PMPS also a large residual line-width of the order of 240…”

Section: Introductionmentioning

confidence: 99%

The effect of intramolecular relaxations on the damping of longitudinal and transverse phonons in polysiloxanes studied by Brillouin spectroscopy

Kriegs

Meier

Gapiński

et al. 2008

The Journal of Chemical Physics

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The effect of intra-molecular relaxations on the damping of longitudinal and transverse phonons was studied in poly(methylphenylsiloxane) (PMPS) and poly(ethylmethylsiloxane) (PEMS) polymers by means of Brillouin spectroscopy. It is shown that studies of the polarized and depolarized Brillouin spectra as functions of temperature and pressure allow for the separation of the contributions of the internal and structural relaxations to the damping of longitudinal and transverse phonons, respectively. In polymers with intra-molecular relaxations these processes contribute not only to the damping of longitudinal phonons, according to theoretical predictions, but also transverse phonons, in contradiction to the theory.1

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Relaxation in Poly(alkyl methacrylate)s: Crossover Region and Nanophase Separation

Cited by 118 publications

References 80 publications

Comparison of mechanical and dielectric relaxation processes in laser-deposited poly(methyl methacrylate) films

Comparison of mechanical and dielectric relaxation processes in laser-deposited poly(methyl methacrylate) films

Study of the structure and dynamics of poly(vinyl pyrrolidone) by molecular dynamics simulations validated by quasielastic neutron scattering and x-ray diffraction experiments

The effect of intramolecular relaxations on the damping of longitudinal and transverse phonons in polysiloxanes studied by Brillouin spectroscopy

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