Thermadapt Shape Memory Polymers with Predictable and Arbitrary Shape Shifting

Abstract

AbstractThe development of shape memory polymers (SMPs) with a better linear relationship between the shape retention ratio (R ret) and the corresponding stress relaxation (R σ) can address scientific challenges, such that the arbitrary shape shifting can be realized and a desired and accurate strain can be obtained during the procedure of stress relaxation. This method is predictable, accurate, time‐saving, and can prevent the deterioration of materials. However, almost no attention is paid to the predictable and arbitrary shape‐shifting phenomenon. Here, a new phenomenon that the materials exhibit a relatively better linear relationship and the major factor behind the phenomenon—there is a better linear relationship with the decrease in the molecular weight between the cross‐linking points (M c)—are found. Such a one shape memory network with combined catalyst‐free, arbitrary shape shifting, and reprocessability without sacrificing the outstanding shape memory performance, is expected to have a significant and positive impact on the medical device industry, and provides a new strategy for the design of thermadapt SMPs.