Improved shape memory and mechanical properties of microwave-induced shape memory polymer/MWCNTs composites

Abstract

Microwave (MV)-induced thermo-responsive shape memory thermoplastic polyurethane (SMPTU)/MWCNT composites were prepared in micro-compounder through ex-situ polymerization. Composites containing different amount of multiwallcarbonnanotube (MWCNT) ranging from 0 to 1.5 phr in SMTPU matrix were prepared. Maximum stretching strength, recovery force and tensile strength for 1.5 CNTPU(1.5 phr MWCNT in SMTPU matrix) was increased by 120%, 100%, and 24% respectively as compared to SMPTU. Cryogenic fractured surface morphology was studied in FE-SEM (Field Emission Scanning Electron Microscopy).MV-induced shape memory is a novel approach for fast, clean and remote heat theng during operation. The glass transition temperatureanalysis was done in DMA, which depends on the loading phr and dispersion of MWCNT in SMTPU matrix. MWCNT is strong absorption of microwave irradiation so that SMTPU/MWCNTs nanocomposites successfully triggered by microwave. Further MV-induced shape recovery strongly depends on the concentration of MWCNTs and MV frequency. MV-induced SMTPU/MWCNT composites have uniform volumetric heating provided a potentially better option for very fast heating, remote actuating, sensors, and several wireless devises.