The Influence of Drawing in Hot Water on The Morphological Properties of Pet Films as Measured by DSC and Modulated DSC |
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| Authors: | Zumailan A Denis G Dargent E Saiter J M Grenet J |
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| Institution: | (1) Laboratoire d’Etude et de Caractérisation des Amorphes et des Polymères, Université de Rouen, Faculté des Sciences, 76821 Mont-Saint-Aignan Cedex, France;(2) Faculty of Sciences, Department of Physics, Aden University, P.O. Box 6014, Khormaksar, Aden, Yemen;(3) Perrier Vittel Management & Technology, villa des Fées, B.P. 43, 88805 Vittel Cedex, France |
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| Abstract: | PET films uniaxially drawn in hot water are studied by means of conventional DSC and modulated DSC (MDSC).Glass transition
is studied by MDSC which allows to access the glass transition temperature T
g and the variations of ΔC
p=C
p1−C
pg (difference between thermal capacity in the liquid-like and glassy states at T=T
g). Variations of T
g with the water content (which act as plasticizer) and with the drawing (which rigidifies the amorphous phase) are discussed
with regard to the structure engaged in these materials. The increments of ΔC
p at T
g are also interpreted using a three phases model and the 'strong-fragile’ glass former liquid concept. We show that the ‘fragility’
of the medium increases due to the conjugated effects of deformation and water sorption as soon as a strain induced crystalline
phase is obtained. Then, ‘fragility’ decreases drastically with the occurring rigid amorphous phase.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | DSC MDSC PET water |
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