Abstract
This chapter reviews some characterization techniques used in the study of shape memory polymers at the Shape Memory Textile Center, with an emphasis on identifying the unique properties possessed by this class of polymer. Differential Scanning Calorimetry (DSC) and Wide Angle X-ray Diffraction (WAXD) are used to investigate the microstructures of the synthesized Polyurethane (PU) samples. Dynamic Mechanical Analysis (DMA) is used to probe the thermal properties of the polymers. The vibrational modes observed by Fourier Transform Infrared (FTIR) Spectroscopy and Raman spectroscopy will be used to identify the major components in the PU samples and to probe the molecular orientation of the PU thin films, respectively. The molecular weight of different samples when dissolved in solvent is measured and compared by Gel Permeation Chromatography (GPC). Surface morphology is characterized by Polarizing Microscopy (POM) and Transmission Electron Microscopy (TEM). The chapter describes how Positron Annihilation Lifetime Spectroscopy (PALS) is able to access the free volume of the PU samples.
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