甲基丙烯酸缩水甘油酯改性氮化硼纳米片掺杂环氧树脂及其耐辐射性能

Epoxy resin with glycidyl-methacrylate-modified boron nitride nanosheets for radiation resistance

环氧树脂(EP)具有良好的机械和绝缘性能,被广泛地应用于航空航天和核工业领域,但其在高能辐射环境中容易降解失效。氮化硼(BN)具有优异的辐射稳定性,但其与高分子基体较差的相容性限制了性能发挥。本工作利用γ辐射对氮化硼纳米片(BNNSs)进行改性,制备出与EP具有良好相容性的甲基丙烯酸缩水甘油酯(GMA)改性的氮化硼纳米片(BNNSs@PGMA),并通过溶液共混,将其引入环氧树脂基体中,制备出EP、BNNSs/EP、BNNSs@PGMA/EP复合材料,同时研究了γ射线辐照前后复合材料性能的变化。结果表明:环氧树脂复合材料的拉伸强度随着吸收剂量的增大呈现先增大后减小的趋势;吸收剂量小于400 kGy时,辐射交联占据主导作用,400~1000 kGy吸收剂量下主要是辐射降解占据主导作用;吸收剂量1000 kGy时,EP的拉伸强度下降了42.9%,而BNNSs@PGMA/EP的拉伸强度仅下降了21.3%,表现出优异的耐辐射性能。提高BNNSs@PGMA的改性率可以增强复合材料的耐辐射性能。

Epoxy resin(EP)has good mechanical and insulating properties and is widely used in the aerospace and nuclear industry.However,it can become degraded and failure-prone in high-energy radiation environments.Although boron nitride(BN)is stable in high-radiation fields,the actual performance of the radiation stability of BN is limited owing to its poor compatibility with the polymer matrix.In this study,boron nitride nanosheets(BNNSs)were modified by applying radiation to prepare BNNSs modified by glycidyl-methacrylate(BNNSs@PGMA),which has good compatibility with EP.Then,BNNSs@PGMA were introduced into the EP matrix by employing solution blending to prepare EP composites:EP,BNNSs/EP,and BNNSs@PGMA/EP.Moreover,the changes in the properties of these composites before and afterγ-ray irradiation were investigated.The results indicated that the tensile strength of EP composites first increased and then decreased with an increasing absorbed dose.Radiation crosslinking dominated in the case of an absorbed dose of 0-400 kGy,whereas radiation cracking played a leading role for an absorbed dose of 400-1000 k Gy.For the absorbed dose of 1000 kGy,the tensile strength of EP decreased by 42.9%,whereas that of BNNSs@PGMA/EP decreased by only 21.3%,which indicated more excellent radiation resistance.In addition,the resistance of the composites was improved by increasing the degree of modification in BNNSs@PGMA.