THERMAL, DYNAMIC MECHANICAL ANALYSIS AND MECHANICAL PROPERTIES OF POLYBUTYLENE TEREPHTHALATE/POLYETHYLENE TEREPHTHALATE BLENDS

Muhammad Akmal Ahmad Saidi; Azman Hassan; Mat Uzir Wahit; Lai Jau Choy; Hazleen Anuar

doi:10.11113/jt.v82.14802

Authors

Muhammad Akmal Ahmad Saidi Department of Bioprocess and Polymer Engineering, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia http://orcid.org/0000-0001-9161-5665
Azman Hassan Department of Bioprocess and Polymer Engineering, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia Centre for Advanced Composite Materials, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia http://orcid.org/0000-0002-4247-9158
Mat Uzir Wahit Department of Bioprocess and Polymer Engineering, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia Centre for Advanced Composite Materials, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
Lai Jau Choy Department of Bioprocess and Polymer Engineering, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia http://orcid.org/0000-0003-2651-0044
Hazleen Anuar Department of Manufacturing and Materials Engineering, Kulliyyah of Engineering, International Islamic University Malaysia, Kuala Lumpur 50728, Malaysia http://orcid.org/0000-0001-9199-0422

DOI:

https://doi.org/10.11113/jt.v82.14802

Keywords:

Polybutylene terephthalate, polyethylene terephthalate, polymer blend, dynamic mechanical analysis, mechanical and thermal properties

Abstract

Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and mechanical tests were conducted to characterize the properties of polybutylene terephthalate/polyethylene terephthalate (PBT/PET) blends. PBT and PET were blended at different PBT/PET ratios (80/20, 60/40, 40/60, 20/80) via twin screw extruder prior to injection molding. DSC characterization showed a single glass transition temperature for all PBT/PET blends indicating that the miscibility occurred in the amorphous region. From DMA results, loss modulus and tan Î´ also showed a single peak for all PBT/PET blends, confirming the DSC results. At room temperature, PBT/PET 20/80 has the highest storage modulus followed by PBT/PET 80/20 blend. PET has higher tensile strength, flexural strength, Youngâ€™s and flexural modulus than PBT but lower in elongation at break and impact strength. PBT/PET 80/20 blend has the highest tensile strength, flexural strength, elongation at break, and impact strength compared to other PBT/PET blends. PBT/PET 80/20 blend can be suggested as an optimum formulation with balanced mechanical properties in terms of stiffness and toughness.

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