Evaluation of Surface Composition in Miscible Polymer Blends by Lateral Force Microscopy

摘要

A novel method to characterize surface composition in blends of two chemically identical polymers with different molecular masses using lateral force microscopy is proposed. Extending Gordon-Taylor equation to surface, surface composition in the blends would be obtained by measuring surface glass transition temperature of each constituent as well as the blend. Surface composition in blends of polystyrene (PS) and deuterated PS (dPS) obtained by this method was in good accordance with the result by well-established surface spectroscopy. Finally, surface composition in blend films of two PSs with different molecular masses was experimentally elucidated. The surface enrichment of a smaller mass component became more remarkable with increasing molecular mass disparity between the two components.