The proposed experiment is aimed at studying the structure formation in novel biodegradable polyurethanes for biomedical applications based on multiblock architectures including crystallizable poly(1,4-butylene adipate) and poly(ε-caprolactone) blocks. These materials demonstrate thermo-induced shape memory effect with two switching points below and above human body temperature. We are going to perform time- and temperature-resolved microfocus SAXS/WAXS experiments to address formation of two independent crystal phases of covalently bonded blocks inside one spherulite as a function of time and sample thermal history. In addition, will analyze the polymorphic behavior of spherulites using ultrafast heating/cooling programs. In the proposed experiment, the distribution and thermal behavior of these phases in one single spherulite will be monitored by micro-focus X-ray diffraction combined with nanocalorimetry.