聚醚胺和聚醚多元醇对环氧/酸酐体系的原位增韧作用

In-Situ Toughening of Epoxy/Anhydride System by Polyether Amines and Polyether Polyols

研究了聚醚胺PEA2000和聚醚多元醇PPG2000对环氧/酸酐体系的原位增韧作用,并探讨了它们的增韧机理。通过对比研究PEA2000和PPG2000在不同含量时对环氧/酸酐体系固化物的力学性能及热变形温度的影响,发现PEA2000对环氧/酸酐体系的增韧效果要优于PPG2000,最佳用量为10 phr,此时固化体系的拉伸强度提高了2.18 MPa,断裂伸长率提升了31.3%,冲击强度提高了39.2%。通过SEM对PEA2000和PPG2000的含量为10 phr时的固化样条的冲击断面进行研究,发现在固化体系中PEA2000形成了均相体系,而PPG2000形成了分相体系。通过对PEA2000和PPG2000增韧机理的探究发现二者增韧效果不同的主要原因是因为端基反应活性不同而导致他们与环氧网络相容性存在差异。

In this paper, the in situ toughening of epoxy/anhydride system by polyether amine PEA2000and polyether polyol PPG2000 was studied, and their toughening mechanism was also discussed. The effect of different contents of PEA2000 and PPG2000 on the mechanical properties and thermal deformation temperature of cured epoxy/anhydride system was studied. It was found that the toughening effect of PEA2000 on epoxy/anhydride system was better than that of PPG2000, and the optimal dosage was 10 PHR.At this time, the tensile strength of the cured system increased by 2.18 MPa, the elongation at break increased by 31.3%, and the impact strength increased by 39.2%. SEM was used to study the impact section of PEA2000 and PPG2000 when the content of PEA2000 and PPG2000 was 10 PHR. It was found that PEA2000 formed a homogeneous system in the curing system, while PPG2000 formed a phase separation system. Through the study of toughening mechanism of PEA2000 and PPG2000, it was found that the main reason for the different toughening effects of PEA2000 and PPG2000 was the difference of compatibility between PEA2000 and PPG2000 and epoxy network due to the different end group reactivity.