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Titolo:
TOWARDS A MOLECULAR APPROACH TO PHYSICAL AGING IN POLY(METHYL METHACRYLATE)
Autore:
PETHRICK RA; DAVIS WJ;
Indirizzi:
UNIV STRATHCLYDE,DEPT PURE & APPL CHEM,THOMAS GRAHAM BLDG,295 CATHEDRAL ST GLASGOW G1 1XL LANARK SCOTLAND
Titolo Testata:
Polymer international
fascicolo: 1, volume: 47, anno: 1998,
pagine: 65 - 71
SICI:
0959-8103(1998)47:1<65:TAMATP>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-ANNIHILATION; STRUCTURAL RELAXATION; PROGRAM;
Keywords:
POSITRON ANNIHILATION LIFETIME SPECTROSCOPY; DIELECTRIC RELAXATION SPECTROSCOPY; DYNAMIC MECHANICAL THERMAL ANALYSIS; PHYSICAL AGING STUDIES; POLY(METHYL METHACRYLATE);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
R.A. Pethrick e W.J. Davis, "TOWARDS A MOLECULAR APPROACH TO PHYSICAL AGING IN POLY(METHYL METHACRYLATE)", Polymer international, 47(1), 1998, pp. 65-71

Abstract

Physical ageing studies are reported on poly(methyl methacrylate) (PMMA) using positron annihilation lifetime spectroscopy (PALS), dielectric relaxation spectroscopy (DRS) and dynamic mechanical thermal analysis (DMTA). A comparison of the results obtained from these different techniques indicates that the assumption of thermorheological simplicity for physical ageing is most probably questionable. Physical ageing appears to be primarily concerned with a loss in the relaxation strength in the region below the glass transition temperature as monitored isothermally using DRS. Analysis of the 'ageing rates' obtained from these three very different types of observation indicates the possibilityof a common molecular origin to the processes observed. (C) 1998 Society of Chemical Industry.

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Documento generato il 07/04/20 alle ore 03:49:48