Shape recovery behavior and mechanical performance of 4D printed Polyurethane/MWCNT nanocomposites under γ-irradiation

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer Pub Date : 2025-01-15 DOI:10.1016/j.polymer.2024.127932

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 (T_g) 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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γ辐照下4D打印聚氨酯/MWCNT纳米复合材料的形状恢复行为和力学性能

形状记忆聚合物（SMPs）是一类智能材料，用于各种应用，并在响应外部刺激时表现出独特的形状改变能力。将多壁碳纳米管（MWCNTs）等纳米颗粒加入到SMPs中可以进一步提高SMPs的性能。然而，伽马（γ）辐照对这些纳米复合材料的影响仍然相对未被探索。在目前的工作中，纳米复合材料样品受到不同的γ辐照剂量，分别为100、200和300 kGy。综合分析了辐照前后纳米复合材料的力学、热、显微和形状记忆性能的变化。结果显示，在200 kGy γ辐照剂量下，材料的力学和热性能得到了显著改善，拉伸强度提高41%，弯曲强度提高38%，玻璃化转变温度（Tg）提高11%。研究了γ辐照对MWCNTs的影响及其与SMP的相互作用。进一步研究了条形试件和波形试件在拉伸和压缩条件下的形状恢复响应。结果表明，SMP纳米复合材料的各项参数在最佳辐照剂量后均呈下降趋势。

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来源期刊

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.