Shape Recovery Behavior and Mechanical Performance of 4D Printed Polyurethane/MWCNT Nanocomposites Under γ-Irradiation

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Sivanagaraju Namathoti, Sri Ram Murthy Paladugu, Aruna Kumar Barick, P.S.Rama Sreekanth
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Abstract

Shape memory polymers (SMPs) are a class of smart materials that are used in diverse applications and exhibit unique shape-changing abilities in response to external stimuli. Incorporating nanoparticles such as multi-walled carbon nanotubes (MWCNTs) into SMPs can further enhance their performance. However, Gamma (γ) irradiation effect on these nanocomposites remains relatively unexplored. In the current work, nanocomposite specimens were subjected to varying γ-irradiation doses of 100, 200, and 300 kGy. A comprehensive analysis was conducted to evaluate the changes in mechanical, thermal, micrographic, and shape memory behavior of the nanocomposites before and after irradiation. The results revealed a significant improvement in mechanical and thermal properties, with a 41% increase in tensile strength, a 38% increase in flexural strength, and a 11% in glass transition temperature (Tg) observed at the 200 kGy γ-irradiation dose. The influence of γ-irradiation on MWCNTs and their interaction with SMP was also examined. Furthermore, the shape recovery responses of strip and waveform specimens in extension and compression were investigated. It was observed that all the investigated parameters of the SMP nanocomposites showed a decline beyond an optimum irradiation dosage.

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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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