Differential scanning calorimetric and free volume study of reactive compatibilization by EPM-g-MA of poly(trimethylene terephthalate)/EPDM blends

Ravikumar, H. B. and Ranganathaiah, C. and Kumaraswamy, G. N. and Deepa Urs, M. V. and Jagannath, J. H. and Bawa, A. S. and Thomas, S. (2006) Differential scanning calorimetric and free volume study of reactive compatibilization by EPM-g-MA of poly(trimethylene terephthalate)/EPDM blends. JOURNAL OF APPLIED POLYMER SCIENCE, 100 (1). pp. 740-747.

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Official URL: http://dx.doi.org/10.1002/app.23450

Abstract

Differential scanning calorimetry (DSC) and positron annihilation lifetime measurements have been carried out to study the effect of the compatibilizer maleic anhydride grafted ethylene propylene copolymer (EPM-g-MA) in poly trimethylene terephthalate and ethylene propylene diene monomer (PTT/EPDM) immiscible blends. The DSC results for the blends of 50/50 and 30/70 compositions show two clear glass transition temperatures, indicating that the blends are two-phase systems. With the addition of compatibilizer, the separation between the two glass transitions decreased, suggesting an increased interaction between the blend components with compatibilizer. At 5 wt % of compatibilizer, the separation between the T(g)s reduced in both 50/50 and 30/70 blends. The positron results, for the blends without compatibilizer showed an increase in relative fractional free volume, as the EPDM content in the blend is increased. This suggests the coalescence of free volume of EPDM with the free volumes of PTT due to phase separation. However, the effect of compatibilizer in the blends was clearly seen with the observed minimum in free volume parameters at 5% of the compatibilizer, further suggesting that this percent of compatibilizer seems to be the optimum value for these blends. (c) 2006 Wiley Periodicals, Inc.

Item Type: Article
Uncontrolled Keywords: differential scanning calorimetry; PTT/EPDM blend; glass transition temperature; o-Ps lifetime; free volume; compatibilizer
Subjects: Agriculture Biological Sciences > Food Science & Nutrition
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Food Science & Nutrition

Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Users 17 not found.
Date Deposited: 06 May 2013 12:32
Last Modified: 19 Aug 2013 11:14
URI: http://eprints.uni-mysore.ac.in/id/eprint/8396

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