76
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Cendoya I, Alegría A, Alberdi JM, Colmenero J, Grimm H, Richter D, Frick B. Effect of Blending on the PVME Dynamics. A Dielectric, NMR, and QENS Investigation. Macromolecules 1999. [DOI: 10.1021/ma9819539] [Citation(s) in RCA: 128] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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77
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Nogales A, Ezquerra TA, Batallán F, Frick B, López-Cabarcos E, Baltá-Calleja FJ. Restricted Dynamics in Poly(ether ether ketone) As Revealed by Incoherent Quasielastic Neutron Scattering and Broad-Band Dielectric Spectroscopy. Macromolecules 1999. [DOI: 10.1021/ma9815758] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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78
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Stark B, Stühn B, Frey H, Lach C, Lorenz K, Frick B. Segmental Dynamics in Dendrimers with Perfluorinated End Groups: A Study Using Quasielastic Neutron Scattering. Macromolecules 1998. [DOI: 10.1021/ma9801669] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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79
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Mukhopadhyay R, Alegría A, Colmenero J, Frick B. Methyl Group Dynamics in Poly(vinyl acetate): A Neutron Scattering Study. Macromolecules 1998. [DOI: 10.1021/ma970575p] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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80
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Alba-Simionesco C, Fujimori H, Morineau D, Frick B. A Study of the Glass Transition of Molecular Liquids as a Function of Pressure and Temperature. ACTA ACUST UNITED AC 1997. [DOI: 10.1143/ptps.126.229] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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81
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Frick B, Alba-Simionesco C, Hendricks J, Willner L. Incoherent Inelastic Neutron Scattering on Polybutadiene under Pressure. ACTA ACUST UNITED AC 1997. [DOI: 10.1143/ptps.126.213] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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82
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Büttner H, Kearley G, Frick B. Tunnelling of the one-dimensional rotor NH3D+ in the NH4ClO4 and NH4PF6 lattices. Chem Phys 1997. [DOI: 10.1016/s0301-0104(96)00298-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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83
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Buchenau U, Wischnewski A, Richter D, Frick B. Is the Fast Process at the Glass Transition Mainly due to Long Wavelength Excitations? PHYSICAL REVIEW LETTERS 1996; 77:4035-4038. [PMID: 10062371 DOI: 10.1103/physrevlett.77.4035] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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84
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Johnson M, Frick B, Trommsdorff H. A high resolution, inelastic neutron scattering investigation of tunnelling methyl groups in aspirin. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00622-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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85
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Buchenau U, Pecharroman C, Zorn R, Frick B. Neutron Scattering Evidence for Localized Soft Modes in Amorphous Polymers. PHYSICAL REVIEW LETTERS 1996; 77:659-662. [PMID: 10062870 DOI: 10.1103/physrevlett.77.659] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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86
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Sokolov AP, Buchenau U, Steffen W, Frick B, Wischnewski A. Comparison of Raman- and neutron-scattering data for glass-forming systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:R9815-R9818. [PMID: 9980121 DOI: 10.1103/physrevb.52.r9815] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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87
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Zorn R, Arbe A, Colmenero J, Frick B, Richter D, Buchenau U. Neutron scattering study of the picosecond dynamics of polybutadiene and polyisoprene. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:781-795. [PMID: 9963480 DOI: 10.1103/physreve.52.781] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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88
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Frick B, Buchenau U, Richter D. Boson peak and fast relaxation process near the glass transition in polystyrene. Colloid Polym Sci 1995. [DOI: 10.1007/bf00656884] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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89
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Frick B, Richter D. The Microscopic Basis of the Glass Transition in Polymers from Neutron Scattering Studies. Science 1995; 267:1939-45. [PMID: 17770103 DOI: 10.1126/science.267.5206.1939] [Citation(s) in RCA: 180] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Recent neutron scattering experiments on the microscopic dynamics of polymers below and above the glass transition temperature T(g) are reviewed. The results presented cover different dynamic processes appearing in glasses: local motions, vibrations, and different relaxation processes such as alpha- and beta-relaxation. For the alpha-relaxation, which occurs above T(g), it is possible to extend the time-temperature superposition principle, which is valid for polymers on a macroscopic scale, to the microscopic time scale. However, this principle is not applicable for temperatures approaching T(g). Below T(g), an inelastic excitation at a frequency of some hundred gigahertz (on the order of several wave numbers), the "boson peak," survives from a quasi-elastic overdamped scattering law at high temperatures. The connection between this boson peak and the fast dynamic process appearing near T(g) is discussed.
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90
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Batallán F, Frick B, Ezquerra TA. Molecular dynamics of ferroelectric polymeric systems as studied by incoherent quasielastic neutron scattering. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:13214-13224. [PMID: 9975512 DOI: 10.1103/physrevb.50.13214] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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91
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Janot C, Magerl A, Frick B. Localized vibrations from clusters in quasicrystals. PHYSICAL REVIEW LETTERS 1993; 71:871-874. [PMID: 10055389 DOI: 10.1103/physrevlett.71.871] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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92
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Frick B, Richter D. Change of the vibrational dynamics near the glass transition in polyisobutylene: Inelastic neutron scattering on a nonfragile polymer. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:14795-14804. [PMID: 10005853 DOI: 10.1103/physrevb.47.14795] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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93
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Stuhr U, Steinbinder D, Wipf H, Frick B. The Concentration Dependence of Hydrogen Diffusion in fcc TiH
x
, TiD
x
and YH
x
*. ACTA ACUST UNITED AC 1993. [DOI: 10.1524/zpch.1993.181.part_1_2.089] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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94
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Richter D, Zorn R, Farago B, Frick B, Fetters LJ. Richter et al. reply. PHYSICAL REVIEW LETTERS 1992; 69:1621. [PMID: 10046269 DOI: 10.1103/physrevlett.69.1621] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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95
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96
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Colmenero J, Alegría A, Arbe A, Frick B. Correlation between non-Debye behavior and Q behavior of the alpha relaxation in glass-forming polymeric systems. PHYSICAL REVIEW LETTERS 1992; 69:478-481. [PMID: 10046949 DOI: 10.1103/physrevlett.69.478] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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97
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Böckmann U, Schütz K, Frick B, Dancygier H. [Hemobilia as a rare cause of gastrointestinal bleeding]. Dtsch Med Wochenschr 1992; 117:415-8. [PMID: 1544344 DOI: 10.1055/s-2008-1062327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In a 67-year-old man with upper abdominal and gastrointestinal bleeding gastroscopy revealed a duodenal ulcer which was initially taken to be the source of the bleeding. But subsequent retrograde cholangiography demonstrated nearly complete occlusion of the right hepatic duct and a suspicious tumour-like structure. At laparotomy a tumour was excluded and the supplying artery to the ulcer was ligated to arrest the bleeding. Gastrointestinal bleeding recurred postoperatively so that selective angiography of the hepatic artery had to be performed. This demonstrated an aneurysm of a branch of the hepatic artery near the hilus. No further bleeding occurred after its embolization. Haemobilia is a rare cause of upper abdominal bleeding and may be difficult to diagnose, except by selective imaging techniques.
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98
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Richter D, Zorn R, Farago B, Frick B, Fetters LJ. Decoupling of time scales of motion in polybutadiene close to the glass transition. PHYSICAL REVIEW LETTERS 1992; 68:71-74. [PMID: 10045115 DOI: 10.1103/physrevlett.68.71] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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99
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Stuhr U, Steinbinder D, Wipf H, Frick B. The Concentration Dependence of Hydrogen Diffusion in fcc TiH x, TiD xand YH x*. Z PHYS CHEM 1992. [DOI: 10.1524/zpch.1992.1.1.631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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100
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Colmenero J, Alegra A, Alberdi JM, Alvarez F, Frick B. Dynamics of the alpha relaxation of a glass-forming polymeric system: Dielectric, mechanical, nuclear-magnetic-resonance, and neutron-scattering studies. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:7321-7329. [PMID: 9998644 DOI: 10.1103/physrevb.44.7321] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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