Mechanical property is one of the quite important factors of optical articles. Most of pure plastics materials are rarely found to have both high strength and toughness. The paper aims to investigate mechanical properties of polymethyl methacrylate and polycarbonate (PC/PMMA) blends by means of injection molding process and optimization technique. In this study, four factors including composition, packing pressure, melt temperature, and cooling time are taken into account. Experimental results show that the composition is found as the most significant factor for improving the mechanical properties of PC/PMMA blends with confidence level of 95 %. Meanwhile, melt temperature and cooling time are also the most significant parameters for enhancing impact strength with 95 % confidence level. In addition, the mechanical properties of the PC/PMMA plastics composites have been enhanced significantly. Specifically, average tensile yield strength, impact strength, and average elongation are 76.5 MPa, 7429.5 J/m², and 17.5 mm, respectively.

机械性能是光学制品相当重要的因素之一。大多数纯塑料材料很少被发现同时具有高强度和韧性。本文旨在通过注射成型工艺和优化技术研究聚甲基丙烯酸甲酯和聚碳酸酯 (PC/PMMA) 共混物的机械性能。在这项研究中，考虑了四个因素，包括成分、保压压力、熔体温度和冷却时间。实验结果表明，该成分被认为是改善 PC/PMMA 共混物机械性能的最重要因素，置信水平为 95%。同时，熔体温度和冷却时间也是提高冲击强度的最重要参数，置信度为 95%。此外，PC/PMMA 塑料复合材料的力学性能得到显着提高。具体而言，平均拉伸屈服强度、冲击强度和平均伸长率为 76.5 MPa，7429.5 J/m分别为²和 17.5 毫米。