Abstract: The formation of stereocomplex and aggregates structure of atactic poly(methyl-methacrylate) (a-PMMA) stereocomplex at substrate was studied by using Atomic Force Microscopy and Reflection Absorption Infrared Spectroscopy(AFMand RAS). Comparing AFM images of pure isotactic and syndiotactic PMMA with that of the mixture of isotactic and syndiotactic PMMA in which stereocomplex formed, it is shown that stereocomplex lead to the dendritic aggregates of PMMA on silicon wafer. The dendritic aggregates of a-PMMA indicated that the stereocomplex formed in a-PMMA, which played an important role in the patterning of a-PMMA at substrate. Reflection Absorption Spectroscopy data show that a-PMMA backbone chain preferred to extend at a substrate than in bulk, it favors to form more stereocomplex.

Key words: Atactic PMMA, Stereocomplex, Atomic force microscopy, Reflectiong absorption IR spec- troscopy