Microstructure analysis of three segmented copolymers containing polydimethylsiloxane by solid‐state high‐resolution NMR

The microstructure of two bicomponent and one tricomponent segmented copolymers, based on polydimethylsiloxane, poly(p‐hydroxystyrene) or/and polysulfone, were investigated using an extended Goldman‐Shen pulse sequence, proton spin‐spin relaxation measurements, and 13C and 29Si NMR spectra. The results indicate that there exist four phases with different sizes, components and morphological structure in the segmented copolymers studied in this work, i.e., a rigid‐chain phase of very slow motion, a rigid‐chain‐rich phase of slow motion, a flexible‐chain‐rich phase of fast motion and a flexible‐chain phase of faster motion. The sizes of different domains, calculated from the spin diffusion rates, are about 50–100 Å for the flexible‐chain‐rich phase of fast motion and 200–300 Å for the flexible‐chain phase of faster motion. The relative quantities of polydimethylsiloxane in the flexible‐chain phase of fast motion are slightly different in different kinds of segmented copolymers.