Segmented polyurethanes (PU) have been used in numerous applications, especially in biomedical engineering and medical devices due to the versatility to modify polyurethane mechanical properties. Although the study of polyurethane structure-property relationships has been an ongoing research theme for decades, the incorporation of functional groups in polyurethane composition to modulate surface properties is a relatively recent sub-topic of this field and less knowledge is available of how positional variation of functional groups affects polyurethane properties. Therefore, to improve our fundamental understanding of how bulk functionalization can increase the surface presentation of functional groups, cationic amine-containing diols were incorporated into PU either in the hard segment or in the soft segment. Here, we correlate the effect of placing the functional group in different locations to explain polymer microscopic (thermal transition, crystallinity, microphase mixing) and macroscopic behaviors (tensile, resiliency, storage and loss modulus, and contact angle).

Effect of positional variation of pendant cationic amines on the mechanical and surface properties of polycaprolactone based segmented polyurethanes

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ACS Fall 2022

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