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Interfacial functional groups,compositional distribution,crystalline structures,and local molecular orientation of functional polymer materials has been directly visualized by nanoscale infrared spectroscopy (nano-IR),in which an atomic force microscope (AFM) probe as infrared absorption sensor was used.NanoIR image visualized hidden binder and adhesion process of multilayer barrier films of polyethylene-terephthalate/polyethylene (PET/PE),and enabled the chemical identification of phase structure of multi-component blends of polycarbonate/acrylonitrile butadiene styrene (PC/ABS) including soft polybutadiene domains as small as 40 nm.