A combination of Polycarbonate (PC) material and Polymethylmethacrylate (PMMA), fabricated using an injection molding machine, has been investigated to determine its advantages, as studied in Ref. 1). This paper aims to investigate the optimization of PMMA/PC blend for both tensile yield strength and impact strength. Furthermore, interaction effects of process conditions on mechanical properties including tensile yield strength and impact strength of PMMA/PC blend by injection molding process are interpreted in this study. Tensile and impact specimens are designed following ASTM, type V, and are fabricated by injection molding process. The processing conditions such as melt temperature, mold temperature, packing pressure, and cooling time are applied; each factor has three levels. As a result, in comparison with optimization of separated responses, mechanical properties of PMMA/PC are found to decrease when optimizing both tensile and impact strengths simultaneously. The melt temperature is found to be the most significant interaction parameter with the mold temperature and packing pressure. In addition, there is more interaction between the mold temperature and cooling time. This investigation provides a useful understanding of the control of injection molding processing of polymer blends in optical application.

Abstract
1. Introduction
2. Experimental Set-up and Methods
    2.1 Design of Experiment
    2.2. Injection Molding Process and Materials
3. Results and Discussion
    3.1 Tensile Yield Strength and Impact Strength
    3.2 Interaction Effects for Tensile Yield Strength
    3.3 Interaction Effects for Impact Strength
4. Conclusion
Acknowledgement
References
Author Information

• Van Thanh Hoang(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang) Corresponding author
• Duc Binh Luu(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang) Corresponding author
• Le Hung Toan Do(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang)
• Ngoc Hai Tran(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang)
• Pham The Nhan Nguyen(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang)
• Minh Sang Tran(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang)
• Minh Thong Tran(Faculty of Mechanical Engineering, University of Science and Technology, The University of Danang)