Solvent Effects on the Crystallization Order and Morphology in PEO-b-PCL Copolymers

Physical structure of block copolymer films plays an important role in the macroscopic properties of the material. Where applicable, crystallization is one important aspect of the physical structure. PEO-b-PCL copolymer films have two crystalline components that makes for rich hierarchical assembly. Using various solvents for film casting has allowed for the opportunity to control this hierarchical assembly. Films were made using various molecular weight samples at varying drying temperatures in an attempt to manipulate the crystallization process. The crystallization order and morphology was monitored via DSC, FTIR, and optical microscopy. It was determined that the relative solubilities of the two blocks influences the film's final structure.