聚氨酯改性TDE-85/MeTHPA环氧树脂的力学性能研究

 采用自制的聚氨酯预聚体(PUP)制备聚氨酯(PU)改性TDE-85/ MeTHPA环氧树脂体系，探讨了聚醚二元醇(PPG)分子量的大小、PUP加入量等因素对PU改性TDE-85/ MeTHPA环氧树脂体系力学性能的影响。研究结果表明，PU改性TDE-85/ MeTHPA环氧树脂的拉伸强度和冲击强度随着合成的PUP加入量的增加先呈上升趋势，达到最大值后又开始下降。采用的PPG分子量不同，得到的改性材料的力学性能相差悬殊。当PPG分子量为1 000，PUP质量分数为15%时，改性材料的拉伸强度达到69.39 MPa，冲击强度达到23.56 kJ/m²，力学综合性能显著提高。

Mechanical properties of TDE-85/MeTHPA epoxy resin modified by polyurethane

Polyurethane-modified TDE-85/MeTHPA epoxy resin was prepared with polyurethane prepolymer (PUP). The effects of the molecular weight of polypropylene glycol (PPG), the content of PUP, and other factors on the resin′s mechanical properties were discussed. The results indicate that the tensile strength and impact strength of the material increase to maximum successively, then decrease with the increasing addition of PUP. The mechanical properties of materials obtained are distinctively different because of different molecular weight of PPG. When the PPG′s molecular weight is 1 000 and the mass fraction of PUP is 15%, the integrity mechanical property of the modified material is improved obviously. Its tensile strength is 69.39 MPa and its impact strength is 23.56 kJ/m2.