Synthesis of Epoxy and Block Oligomer Modified Clay Nanocomposite

摘要

Acrylic triblock (A_xM_yB_z) and diblock (M_yB_z) oligomers containing methyl methacrylate (MMA, M), methacrylic acid (MAA, A) and dimethylaminoethyl methacrylate (DMAEMA, B) groups are intercalated into the layers of montmorillonite. The results indicate that the block oligomer lay flatly between the clay layers. ICP analyses of Na~+ content indicate no unexchanged sodium ions are left in the intercalated clay. Nanocomposites of epoxy and clay modified with block oligomers were synthesized. Glass transition temperature (T_g) of the nanocomposite is 129.6℃ (M_(18)B_(24)~(24+) modified clay) compared to 84.1℃ for the physical mixture of epoxy and unmodified clay. T_g increases with decreasing amount of modified clay. When modified clay content are below 2 phr, T_g higher than 131.7℃ can be obtained. Water resistance and light transmittance of the nanocomposite is also improved over composite of epoxy and unmodified clay.