Citation: Mao Fan, Si-rui Fu, Shuo Guo, Feng Chen, Qiang Fu. Fabrication of High-performance PBS/PETG Blends by High-speed Extrusion[J]. Acta Polymerica Sinica, ;2018, 0(9): 1244-1252. doi: 10.11777/j.issn1000-3304.2018.18005 shu

Fabrication of High-performance PBS/PETG Blends by High-speed Extrusion

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065

Corresponding author: Qiang Fu, qiangfu@scu.edu.cn
Received Date: 4 January 2018
Revised Date: 26 February 2018
Available Online: 1 March 2018

Blends based on poly(butylene succinate) (PBS) and poly(ethylene glycol-co-cyclohexane-1,4-dimethanolterephthalate) (PETG) were successfully fabricated by a special twin screw extruder. Effects of PETG content and rotating speed on the dispersed size and mechanical properties of the PBS/PETG blends were investigated. The average diameter of PETG phase showed a downwards trend from 2.27 μm to 0.89 μm with increasing rotating speed from 150 r/min to 900 r/min for a blend with 20 wt% of PETG. Meanwhile, the yield strength of the blend was raised from 26.2 MPa to 33.4 MPa. In addition, the elongation at break was also promoted from 13.3% to 133.3%, which indicated a transformation from brittle fracture into ductile fracture as accomplished by high speed extrusion. However, the decrease of the dispersed PETG size was very limited by increasing rotating speed for the blends containing 10 wt% or 30 wt% of PETG. As a result, the yield strength and the elongation at break showed only limited increase in the obtained blends. The relationship between the size of the dispersed phase and mechanical properties of the PBS/PETG blends prepared with different components and at different rotating speeds were analyzed comprehensively. A nearly linear relationship was found between the yield strength and the diameter of the dispersed phase, disregarding the composition and rotating speed. This demonstrated again the importance of the size of the dispersed phase in determining the property of PBS/PETG blends. GPC and DSC results indicated no obvious change in molecular weight and crystallinity of PBS by increasing rotating speed, and the observed property change of the blends was well explained by the change of dispersed phase size induced by high speed rotating. It should be noted that the high speed rotating induced change in the size of the dispersed phase was thermodynamically unstable. The stability of the blends will be investigated in our future work.
- PBS/PETG blends,
- High-speed extrusion,
- Dispersion phase size,
- Mechanical property
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