Preparation of PETG/PC Alloy and Its Toughening Modification
Shanghai SUNNY Technology Co., Ltd., Shanghai 201109, China
Abstract：PC/ABS blending system is a common way to improve the solvent resistance of PC and reduce processing temperature. However, ABS and PC are incompatible systems, and there are some problems in the actual processing process. As a new amorphous polyester, PETG has excellent solvent resistance, which is expected to another blending choice. PETG/PC alloy composites were prepared by a twin-screw extruder. The two-phase compatibility of PETG and PC and the solvent resistance, as well as the mechanical properties of the alloy system under different ratios were studied. The toughness of the material was further improved by the reasonable selection of the type and amount of toughening agent. The results show that there is only one glass transition temperature in the alloy with different proportions, it can be seen that PETG and PC have excellent compatibility. The addition of PETG can significantly reduce the glass transition temperature of PC, and PETG/PC alloy can be processed in a lower temperature than pure PC material. With the increase of the proportion of PC in the alloy, the tensile and bending properties of the material increase significantly, but the solvent resistance decreases gradually. When the ratio of PETG and PC is 7/3, the alloy shows best comprehensive properties. It is found that MBS is better than EMA, TPU and SEBS in toughening PETG/PC alloy. After adding 5% MBS, the impact strength of the alloy reaches 65 kJ/m2, which is better than that of PC.
Keywords：PETG; PC; alloy; toughening modification
Lou Xiaoan. Preparation of PETG/PC alloy and its toughening modification[J]. Engineering Plastics Application，2021，49(1)：40-43.