TPU与纳米SiO2共混增韧改性PET研究

采用热塑性弹性体TPU共混增韧改性PET树脂,在共混物中加入成核剂纳米SiO2提高PET的成核性,同时采用硅烷偶联剂KH-560与氨基偶联剂A-1100两种不同的偶联剂对SiO2进行改性,以提高其在树脂中的相容性和分散性。研究了TPU、成核剂的用量及偶联剂的种类与用量对体系力学性能的影响。结果表明:TPU的加入提高了PET的韧性,但强度及刚性有所降低,且30%的添加质量分数较合适;质量为共混物1%的成核剂SiO2可有效提高PET的成核性,从而提高材料的强度,但对断裂伸长率影响不大;氨基硅烷偶联剂A-1100较硅烷偶联剂KH-560有更好的改性效果。

A Study on TPU and Nano-Sized SiO2 Toughening Modification of PET

The TPU was melted and blended with PET for improving the toughness of PET, SiO2 was added into the blend as an effective nucleating agent, two kinds of coupling agents were used to modify the nanoparticles for improving the compatibility between inorganic particles and different kinds of organic resins. The influence of the mass of TPU, nucleating agent SiO2 and coupling agents on the mechanical properties of blend were studied. The results showed that the roughness of blend increased and the strength decreased with the increase of TPU, 30% wt of TPU is a property mass for good mechanical properties. Nucleating agent nano-sized SiO2 which was 1%wt of blend could improve the ability of nucleation of PET so as to increase the strength of blend, but had little effect on the length at break. Amino silane coupling agent was better than silane coupling agent KH560 for improving the compatibility of blend.