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银虫 (小有名气)

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[交流] 【求助】聚丙烯酸环己酯的玻璃化温度是多少？

请教各位虫友：聚丙烯酸环己酯的玻璃化温度是多少啊？我想知道：丙烯酸环己酯是不是一种软单体？
[search]丙烯酸环己酯的玻璃化温度[/search]

[ Last edited by yogidan on 2008-7-1 at 15:20 ]

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非常感谢各位！
我后来在google搜到有相关的文章,Tg在 25±1°C(DSC法测定),所以可以说是一种软单体(有书上说软硬单体的Tg分界线是40°C)

Titre du document / Document title
Determination of the glass transition temperature of poly(cyclohexyl acrylate) from oxygen permeability measurements

Auteur(s) / Author(s)
COMPAN V. (1) ; LOPEZ M. L. (1) ; MONFERRER L. (1) ; GARRIDO J. ; RIANDE E. ; SAN ROMAN J. ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Univ. Jaume I, dep. exp. sci., 12080 Castellón, ESPAGNE

Résumé / Abstract
The Tg of poly(cyclohexyl acrylate) (PCA) has been obtained from measurements of the oxygen permeability (P= 0.60 barrers, Tg= 23.5±2.0°C) using a potentiostatic electrochemical sensor, and from the oxygen diffusion coefficient (D= 0.12×10-8 cm2 s-1, Tg= 24.0±1.8°C) time-lag by the method. A Tg of 25±1°C was found by DSC and a Tg of 25.0±3.5°C was obtained from the specific volume by dilatometry. The fractional free volume at Tg is 0.020±0.002, which is slightly below (∼ 20%) most glassy polymers. A linear correlation was found between ln D and the reciprocal of vf, which suggests that the polymer morphology is not influenced by the presence of oxygen
Revue / Journal Title
Polymer ISSN 0032-3861 CODEN POLMAG
Source / Source
1993, vol. 34, no14, pp. 2971-2974 (26 ref.)
Langue / Language
Anglais

Editeur / Publisher
Elsevier, Oxford, ROYAUME-UNI (1960) (Revue)

Mots-clés anglais / English Keywords
Alkyl acrylate polymer ; Glass transition temperature ; Measurement method ; Gas permeability ; Gaseous diffusion ; Free volume ; Activation energy ; Experimental study ;
Mots-clés français / French Keywords
Acrylate d'alkyle polymère ; Température transition vitreuse ; Méthode mesure ; Perméabilité gaz ; Diffusion gazeuse ; Volume libre ; Energie activation ; Etude expérimentale ; Acrylate de cyclohexyle polymère ;
Mots-clés espagnols / Spanish Keywords
Acrilato de alquilo polímero ; Temperatura transición vítrosa ; Método medida ; Permeabilidad gas ; Difusión gaseosa ; Volumen libre ; Energía activación ; Estudio experimental ;
Localisation / Location
INIST-CNRS, Cote INIST : 11463, 35400003485985.0080

Copyright 2007 INIST-CNRS. All rights reserved