脂环二胺浅色透明聚酰亚胺薄膜的制备及性能表征

Preparation of Light-colored and Transparent Polyimide Films with Alicyclide Diamine

采用二步法,在冰浴的条件下,以含脂环结构的二胺单体5-氨基-1,3,3-三甲基环己甲胺(IPDA)和4,4′-二氨基二环己基甲烷(PACM)与二酐单体4,4′-(4,4′-异丙基二苯氧基)双(邻苯二甲酸酐)(BPADA),制备六种不同二胺比例的聚酰亚胺(PI)薄膜。通过红外光谱、X射线衍射(XRD)分析、紫外可见光谱、热机械分析、差示扫描量热(DSC)测试、热失重测试和力学性能测试对薄膜进行表征分析。结果表明,PI薄膜已经完全亚胺化,整体为无定型形态,在可见光范围内具有较高的紫外透过率,最大透过率均在87%以上,450 nm最高透过率为83.26%,力学性能表现出柔性,玻璃化转变温度(Tg)均在200℃左右,初始分解温度均在388℃以上,在未到初始分解温度之前,几乎不发生质量损失,热稳定性良好。

The six polyimide(PI)films with different diamine ratios were prepared by a two-step method using the alicyclic-structure-containing diamine monomers 5-amino-1,3,3-trimethylcyclohexylmethylamine(IPDA)and 4,4′-diaminodicyclohexylmethane(PACM)and 4,4′-(4,4′-isopropyldiphenoxy)bis(phthalic anhydride)(BPADA)dianhydride monomers,which reacted under the conditions of ice bath.The films were characterized by infrared spectroscopy,X-ray diffraction method(XRD)ultraviolet-visible spectroscopy,thermo-mechanical analysis,differential scanning calorimetry(DSC)test,heat loss test and mechanical property test.The results show that the PI films have been completely imidized,and the overall amorphous structure has a high UV transmittance in the visible range,with the maximum transmittance above 87%,and the highest transmittance at 450 nm is 83.26%,which has the ability of extension and shows flexibility,glass transition,and the ability of extension.Exhibiting flexibility,the glass transition temperatures(Tg)of the PI films are all around 200℃,and the initial decomposition temperatures are all above 388℃.Before reaching the initial decomposition temperature,almost no weight loss occurs,and the thermal stability is well.