透明耐热聚异氰脲酸酯薄膜的制备与性能分析

Preparation and property analysis of transparent and heat-resistant polyisocyanurate films

为满足柔性衬底薄膜所需的高耐热、高强和高透光等特性,以芳香族二苯基甲烷二异氰酸酯(MDI)和脂肪族六亚甲基二异氰酸酯(HDI)为原料,改变HDI的投料比例,通过二异氰酸酯的环三聚反应,制备兼顾耐热和透光的高性能聚异氰脲酸酯薄膜。探究聚合物前驱液在固化过程中的流变行为,分析聚异氰脲酸酯的结构并测试其热性能、机械性能和光学性能。结果表明:随着HDI投料比例的增加,聚合物前驱液固化反应的速率降低;红外光谱表明成功合成了不同HDI比例的聚异氰脲酸酯薄膜;薄膜的初始分解温度均在455℃以上,玻璃化转变温度均高于192℃,表现为良好的热稳定性;随着HDI投料比例的增加,薄膜的断裂伸长率从5.50%增加至11.97%,且薄膜可见光区平均透过率增加至86.6%。该研究制备的聚异氰脲酸酯薄膜具有良好的耐热性能、机械性能和透光性能,具有应用于柔性衬底薄膜的潜力。

To meet the heat resistance,high mechanical and light transmission properties required for flexible substrate films,we took aromatic diphenylmethane diisocyanate(MDI)and aliphatic hexamethylene diisocyanate(HDI)as raw materials,preparing high performance polyisocyanurate films with both heat resistance and light transmission through the cyclotrimerization of diisocyanate by changing the feeding ratio of HDI.The rheological behavior of polymer precursors during curing was investigated,the structure of polyisocyanurates was analyzed and their thermal,mechanical and optical properties were tested.The results show that the rate of polymer precursor curing reaction decreases as the percentage of HDI feed increases.Infrared spectra indicates the successful synthesis of polyisocyanurate films with different HDI ratios.The initial decomposition temperatures of the films are all above 455℃and the glass transition temperatures are all above 192℃,showing good thermal stability.With the increase of the HDI feeding ratio,the elongation at break of the film increases from 5.50%to 11.97%,and the average transmittance of the film in the visible region increases to 86.6%.The polyisocyanurate films prepared in this study have good thermal,mechanical and light transmission properties and have potential for application in flexible substrate films.