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Titolo:
Temporal evolution of relaxation in rubbed polystyrene thin films - art. no. 061603
Autore:
Tsang, OC; Tsui, OKC; Yang, Z;
Indirizzi:
Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China Hong Kong Univ Sci & Technol Kowloon Hong Kong Peoples R China s R China
Titolo Testata:
PHYSICAL REVIEW E
fascicolo: 6, volume: 6306, anno: 2001,
parte:, 1
pagine: 1603 -
SICI:
1063-651X(200106)6306:6<1603:TEORIR>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
REFLECTANCE DIFFERENCE SPECTROSCOPY; GLASS-TRANSITION TEMPERATURE; DIELECTRIC-RELAXATION; SURFACE; INTERFACE; DYNAMICS; POLYMERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Tsui, OKC Hong Kong Univ Sci & Technol, Dept Phys, Clearwater Bay, Kowloon, Hong Kong, Peoples R China Hong Kong Univ Sci & Technol Clearwater Bay Kowloon Hong Kong Peoples R China
Citazione:
O.C. Tsang et al., "Temporal evolution of relaxation in rubbed polystyrene thin films - art. no. 061603", PHYS REV E, 6306(6), 2001, pp. 1603

Abstract

Temporal relaxation of rubbed polystyrene (PS) thin films (50 nm thick) was studied by probing the decay of the optical anisotropy in the sample. Ourresults show that the relaxation process is characterized by two single-exponential decays plus a temperature-dependent constant. Both relaxations are orders of magnitude faster than the main chain (alpha) relaxation at temperatures well below (>10 degreesC) T-g, with activation energies 3.0 kcal/mol and 5.1 kcal/mol, respectively, either of which are much smaller than that of the alpha relaxation (similar to 50 kcal/mol). The decay time constants are found to be independent of the sample molecular weights M-w (=13.7 Kto 550 K Daltons. M-w/M-n less than or equal to 1.1) at these temperatures. This shows the local nature of the relaxation modes of rubbed PS.

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Documento generato il 03/04/20 alle ore 14:10:53