MECHANICAL, THERMAL AND SHAPE MEMORY CHARACTERIZATION OF A NOVEL EPOXY SHAPE MEMORY POLYMER
Date21st Mar 2022
Time02:00 PM
Venue Google Meet
PAST EVENT
Details
In the past 3 decades a large number of shape memory polymers are available for various applications. This research is aimed to produce a novel epoxy polymer by combining an epoxy-based polymer Diglycidyl Ether of Bisphenol-A (DGEBA-Araldite LY556) and Polypropylene Glycol Diglycidyl Ether (PPGDE). The mechanical, thermal and shape memory characterization of material is studied. It was found that the tensile strength of the material is reduced linearly with increasing the percentage of PPGDE. The elongation at break of the material is increased from 10% to 60% with 25% addition of PPGDE. The glass transition temperature of the material decreases linearly with increasing PPGDE percentage. D-70-P-30 (DGEBA-PPGDE) combination of the material is chosen for shape memory characterisation as its glass transition is above and within the vicinity of room temperature which is the pre-requisite for cold programming. The material shows good shape memory properties such as shape fixity and shape recovery. But it is needed to improve the strength of the shape memory polymer to have a large number of applications, to do so Montmorillonite (MMT) Nano clay is introduced in different proportions into Shape memory polymer. In this research, the effect of the presence of MMT Nano clay on the Morphological, Mechanical and Thermal properties of shape memory polymer is studied. The SEM analysis showed the material is failed at a higher percentage of MMT due to the formation of patches. The size of the patches decreases with increasing in MMT percentage, which resulted in decreasing in elongation with increasing MMT percentage. Tensile test results showed the Modulus of the material and ultimate strength of the material increases with an increase in the percentage of MMT. DMA analysis shows that the glass transition temperature (Tg) of the material changed by a maximum of 30C with increasing in MMT percentage. Laser Flash Analysis (LFA) estimated thermal conductivity, thermal diffusivity and specific heat capacity of the material at various temperatures. LFA results showed that the thermal conductivity of the material decreases with the increase in the temperature as well as by the addition of MMT Nano clay. DSC analysis curves of various samples almost fall on one another. Shape memory analysis for the 0.5% MMT and 1.0% MMT samples showed that material is recovered 100% without being affected by the addition of Nano clay. The recovery time is less in case of 1%MMT than 0.5%MMT samples
Speakers
Mr. Mahesh Unnam
Department of Aerospace Engineering