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利用二苯基甲烷-4,4′-二异氰酸酯(MDI)与酸化的蒙脱土(MMT)表面的羟基进行反应制得了MMTMDI;进一步利用己内酰胺(CPL)对MMT-MDI进行插层并对多余的异氰酸酯端基进行封端,制得了MMT-MDICPL。采用预聚体溶液插层法,利用聚酰胺酸(PAA)在二甲基乙酰胺(DMAC)溶剂中分别对MMT-MDI和MMT-MDI-CPL进行预聚体插层,制得了剥离型纳米MMT/聚酰亚胺(PI)复合材料。通过电感耦合等离子体发射光谱(ICP-OES)、FTIR、TG、XRD和SEM对改性MMT和纳米MMT/PI复合材料进行了表征。结果表明:MDI与MMT表面羟基反应而被成功接枝于MMT上;MDI对MMT的改性、CPL对MMT-MDI的插层和封端使MMT层间距得到逐步扩大;MMT/PI复合材料的XRD和断面SEM表明,MMT在PI基体中得到了充分剥离。
MMTMDI was obtained by the reaction of diphenylmethane-4,4’-diisocyanate (MDI) with hydroxyl groups on the surface of acidified montmorillonite (MMT); MMTDI was further intercalated with caprolactam (CPL) Of the isocyanate end-capped, prepared MMT-MDICPL. The prepolymer intercalation of MMT-MDI and MMT-MDI-CPL by polyamic acid (PAA) in dimethylacetamide (DMAC) MMT / polyimide (PI) composites. The modified MMT and nano-MMT / PI composites were characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-OES), FTIR, TG, XRD and SEM. The results showed that MDI was successfully grafted onto MMT on the surface of MMT. Modification of MMT by MDI, and intercalation and termination of CPT on MMT-MDI gradually expanded the distance between MMT layers. MMT / PI composites XRD and SEM showed that the MMT was well peeled off in PI matrix.