Thermal, dynamic mechanical analysis and mechanical properties of polybutylene terephthalate/polyethylene terephthalate blends

• Main Authors: Ahmad Saidi, Muhammad Akmal, Hassan, Azman, Wahit, Mat Uzir, Lai, Jau Choy, Anuar, Hazleen
• Format: Article
• Language: English
• Published: Penerbit UTM Press 2020
• Subjects: TP Chemical technology
• Online Access: http://eprints.utm.my/id/eprint/90838/1/Azmanhassan2020_ThermalDynamicMechanicalAnalysisandMechanicalProperties.pdf; http://eprints.utm.my/id/eprint/90838/; http://dx.doi.org/10.11113/jt.v82.14802
• Institution: Universiti Teknologi Malaysia

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 δ 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, Young’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.