同时4D打印和原位发泡定制聚乳酸泡沫的形状记忆行为

IF 1.9 Q3 ENGINEERING, MANUFACTURING

Manufacturing Letters Pub Date : 2024-12-06 DOI:10.1016/j.mfglet.2024.11.005

Pedram Honari , Davood Rahmatabadi , Abbas Bayati , Erfan Rassi , Ismaeil Ghasemi , Majid Baniassadi , Mahdi Bodaghi , Mostafa Baghani

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引用次数: 0

摘要

本研究介绍了一种创新的4D打印技术，结合原位发泡，以提高聚乳酸（PLA）泡沫的形状记忆性能。通过将PLA与偶氮二甲酰胺（AZO）在其分解温度以下熔融混合，然后直接进行颗粒打印，获得了均匀的微孔结构和定制的形状记忆行为。研究结果表明，较高的AZO含量提高了形状固定性（~ 96%），但降低了形状恢复。此外，编程温度对性能有显著影响，热编程提高了形状的固结性，冷编程提高了形状的恢复性。这种新颖的方法为具有可编程特性的轻质、隔热和减震材料提供了潜在的应用。

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Simultaneous 4D printing and In-Situ foaming for tailoring shape memory behaviors in polylactic acid foams

This study introduces an innovative 4D printing technique combined with in-situ foaming to enhance the shape memory properties of polylactic acid (PLA) foams. By melt mixing PLA with azodicarbonamide (AZO) below its decomposition temperature, followed by direct pellet printing, the research achieves uniform microporous structures and tailored shape memory behaviors. The findings demonstrate that higher AZO content improves shape fixity (∼96 %) but reduces shape recovery. Moreover, the programming temperature significantly influences performance, with hot programming enhancing shape fixity and cold programming boosting shape recovery. This novel approach offers potential applications in lightweight, thermally insulative, and shock-absorbing materials with programmable properties.

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