Dynamic Mechanical Analysis of PMMACellulose Blends
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Date
2010
Authors
Merenga, Abdullah S.
Katana, G.A
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis
Abstract
Dynamic mechanical analysis (1–30 Hz, 274–414 K) is employed to study the inter- and
intramolecular dynamics in a set of PMMA-CELL blends. Two relaxation processes are
observed, the dynamic glass transition (a-relaxation) being characterized by WLF law
and secondary transition (b-relaxation). The a-relaxation is strongly influenced by the
composition of the blends and shows a rapid slowing down with increasing cellulose
(CELL) intake. Increasing the content of the latter reduces the strength of the
b-relaxation strongly and increases its activation energy by more than 60%. This
proves that owing to the interactions between the cellulose hydroxyl group and PMMA
ester group, the b-relaxation no longer has a local character only. By fitting the Tg data
for the blends to Tg-composition models proposed by Gordon and Taylor and by Jenckel
and Heusch, it is shown that the strength of the interaction increases strongly beyond
72% of CELL intake.
Description
Publisher version (Taylor & Francis) available at http://dx.doi.org/10.1080/00914030903538553
Keywords
cellulose, curve fitting, dynamic mechanical analysis, glass transition temperature, mechanical relaxation parameters, poly(methylmethacrylate)
Citation
International Journal of Polymeric Materials, 60:115–123, 2011