用4,4′-二氨基二苯醚(ODA)、4,4′-氧双邻苯二甲酸酐(ODPA)合成聚酰亚胺基体材料,将质量比分别为1∶3、1∶1、3∶1的改性纳米SiO2和纳米La2O3掺杂进入聚酰亚胺材料中,制备了不同改性聚酰亚胺材料并探究其相关性能。结果表明,与纯聚酰亚胺相比,改性聚酰亚胺吸水率由19.23%分别降低到了1.99%、0.91%、0.85%;UV光谱分析表明,在400～800nm的可见光区,改性聚酰亚胺的透过率随着La2O3含量的增加而降低,其中500～800nm的透过率分别为83.7%～88.2%、78.2%～83.3%、68.2%～73.9%;热性能方面,纯聚酰亚胺的最大失重温度出现在543℃附近,改性聚酰亚胺则分别在593℃、588℃、590℃,表现出优异的稳定性;由于La2O3和SiO2的填充,聚酰亚胺分子中的氮、氧原子难以与水分子形成稳定、足量的氢键,从而使得材料的溶解性表现一般;由应力-应变曲线可知,改性聚酰亚胺相对于纯聚酰亚胺拉升强度有明显提高。改性聚酰亚胺的拉伸强度随着La2O3含量的增加呈现出先减后增的趋势,分别为168.99MPa、166.25MPa、182.25MPa,相对纯聚酰亚胺分别提高16.8%、12.9%、23.8%。
Polyimide matrix materials were synthesized with 4,4′-diaminodiphenyl ether (ODA) and 4,4′-oxydiphthalic anhydride (ODPA).Modified nano-SiO2 and nano-La2O3 were doped into polyimide materials with mass ratios of 1∶3,1∶1 and 3∶1,respectively,to prepare different modified polyimide materials,and their related properties were explored.The results showed that compared with pure polyimide,the water absorption of modified polyimide was reduced from 19.23% to 1.99%,0.91% and 0.85%,respectively.Ultraviolet-visible spectrum analysis indicated that the transmittance of modified polyimide decreased with the increase of La2O3 content in the visible light region from 400nm to 800nm,and the transmittance of modified polyimide was 83.7%～88.2%,78.2%～83.3% and 68.2%～73.9% at 500nm to 800nm,respectively.In terms of thermal properties,the maximum weight loss temperature of pure polyimide appeared around 543℃,while the modified materials were at 593℃,588℃ and 590℃,respectively,showing excellent stability.Due to the filling of La2O3 and SiO2,it was difficult for nitrogen and oxygen atoms in polyimide molecules to form stable and sufficient hydrogen bonds with water molecules,resulting in the material's poor solubility.The stress-strain curves of the materials revealed that the modified exhibited obviously improved tensile strength compared with pure polyimide.With the increase of La2O3 content,the tensile strength of modified polyimide first increased and then decreased,which were 168.99MPa,166.25MPa and 182.25MPa,respectively,and increased by 16.8%,12.9% and 23.8% compared with pure polyimide.
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基金资助
江西省教育厅科学技术研究项目(GJJ2404005);南昌大学科学技术学院自然科学研究项目(2024-KJ-01);江西省教育厅科学技术研究项目(GJJ2203521)
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