Shape Memory Effect in Supertough PETG/EGMA Thermoplastic Vulcanizates Obtained through Dynamic Vulcanization and Interfacial Compatibilization

This study investigates the influence of a ethylene-glycidyl methacrylate copolymer (EGMA) on the shape memory effect (SME) and impact resistance of PETG/EGMA thermoplastic vulcanizates (TPVs). The PETG/EGMA TPVs were prepared by dynamic vulcanization through simple melt blending of the polymers without the need for curing agents such as DCP or sulfur. Simultaneously, in situ reactive compatibilization was achieved solely, without any compatibilizer. The SME, mechanical, thermomechanical, rheological, chemical, and morphological properties of TPVs were characterized. Surprisingly, the PETG/EGMA (80/20) blend exhibited an impact strength of 835.9 J/m, which is 15 times higher than that of neat PETG (53.5 J/m). Increasing the EGMA concentration significantly improved the shape memory effect. The PETG/EGMA (50/50) blend demonstrated an excellent shape recovery (R r) of 84.2%, approximately 2.5 times higher than that of neat PETG (33.4%), with a shape fixity (R f) of 100%. The approach presented in this work offers a practical, simple, and low-cost approach for obtaining PETG/EGMA TPVs with high strength and an excellent shape memory effect, opening up possibilities for the application of this material in various fields.