Cyclic Thermomechanical Analysis of Polyethylene Glycol Based Shape Memory Polymers

Abstract

Shape memory polymers (SMP’s) are a type of smart material that possess the ability to remember its original shape. Shape memory polymer quickly recovers to its original or permanent shape. As a result of these properties, SMPs can be used as sensors, actuators, and transplants, as well as auxiliary materials in a variety of applications. It has been used in a variety of domains over the previous two decades because to its shape memory capability, and its applications are growing at a quicker rate. Due to its biocompatibility, wide range of tunable stiffness, large deformation, large recovery, high elastic property, water vapour permeability, and multi responsive shape memory effect, memory polymers, polyurethanes are the most adaptable polymeric material. They offer several advantages over other types of shape memory materials, such as shape memory alloys, such as easier manufacturing, lighter weight, lower cost, larger recoverable strain, and lesser toxicity. When compared to shape memory alloys (SMA’s), SMPs have a few disadvantages, such as lower moduli, which results in lower recovery stresses, and longer response times. In some applications, a proper recovery stress derived from the elastic recovery stress created during the deformation process is crucial. There is no literature on how to synthesize SMP’s in an efficient manner. SMP’s and its classification in terms of their distinct qualities. This work focuses on the analysis of cyclic thermomechanical tests of linear SMP’s in order to address some of these problems. Form memory polymers were made using a two-step polymerization process in this study, with the composition of PEG 6000-IPDI-PEG600-BDO as 58wt%-42wt%-1ml-1ml respectively and the shape memory effect was assessed using a bend test. Cyclic thermomechanical analysis method involves tensile test procedure in thermal chamber with intermediate temperatures. Mechanical properties such as cyclic thermomechanical test, dynamic mechanical analysis, and tensile test are used in the validation process. In the primary cycle can be determined as for the sample 10 when we applied the load of 0.8 Mpa the strain was found as 200% the shape fixity and shape recovery values are 98.95 and 97.0 respectively.

Fibrous Structures: An Overview of Their Responsiveness to External Stimuli towards Intended Application

“…The most researched and attractive SMPs are polyurethanes (PU) [32,64,65,68,75]. Other SMPs commonly used include: poly(ε-caprolactone) (PCL) [71,76], which is a component of many PU materials; polyethylene terephthalate (PET) [26,76]; polylactic acid (PLA) [32] and co-polymers, such as poly(lactic-co-glycolic acid) (PLGA) [77]; polyethylene glycol (PEG) [78]; among others. In order to improve the recovery of the original shape, mechanical strength and reduced recovery time, for example, reinforcing fillers such as silica, carbon nanotubes, graphene oxides (GOs), and nanoclay, can be incorporated into SMPs [59].…”