Poly(lactic acid)/polycaprolactone-based self-programmed photothermal responsive shape memory polymers

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-06-17 DOI:10.1016/j.reactfunctpolym.2024.105990

Lijie Huang , Yao Sheng , Qi Mo , Shuya Zhang , Yuluo Zheng , Beiwei Wang , Chongxing Huang , Qingshan Duan , Hui Zhao

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Abstract

Shape memory polymers, based on their unique property that they can automatically revert to their original shape after deformation when subjected to external stimuli, have shown great application prospects and practical value in many fields such as aerospace, automotive and biomedical in recent years. In this study, poly(lactic acid) (PLA)/polycaprolactone (PCL) is used as a substrate, and a graft product, PLA-g-GMA, is prepared by grafting glycidyl methacrylate (GMA) onto PLA as a compatibilizer, and then polymer substrates are prepared by melt extrusion. Then, light-responsive shape memory composites are prepared by loading polypyrrole (PPy) nanoparticles with photothermal conversion functionality into the PLA/PCL substrate, and PPy-coated NdFeB (PPy@NdFeB) is used as the functional phase to prepare auto-responsive shape memory polymers that can be programmed automatically. Among them, the PLA/PCL/PPy composites show shape recovery rate (R_r) and shape fixation rate (R_f) of 81.11% and 98.87%, respectively, at a strain of 85.27% under the programming conditions of a deformation temperature of 65 °C and a stress of 2.14 MPa. The PLA/PCL/PPy@NdFeB composite material, in addition to excellent double and triple shape memory behavior, also has obvious magnetic properties, which can be used to carry out self-programmed temporary shapes. This research aims to solve the limitations of temperature-responsive shape memory polymers in a single stimulus response mode, broaden their application scope, further promote the development of shape memory polymers, and provide realistic guidance for the field of 4D printing.

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基于聚（乳酸）/聚己内酯的自编程光热响应形状记忆聚合物

形状记忆聚合物因其受外界刺激变形后能自动恢复原状的独特性质，近年来在航空航天、汽车、生物医学等众多领域显示出巨大的应用前景和实用价值。本研究以聚乳酸（PLA）/聚己内酯（PCL）为基材，将甲基丙烯酸缩水甘油酯（GMA）接枝到聚乳酸上作为相容剂，制备出接枝产物 PLA-g-GMA，然后通过熔融挤出法制备聚合物基材。然后，将具有光热转换功能的聚吡咯（PPy）纳米粒子加入聚乳酸/聚丙烯酸酯基材中，制备光响应形状记忆复合材料，并以PPy包覆的钕铁硼（PPy@NdFeB）为功能相，制备可自动编程的自动响应形状记忆聚合物。其中，PLA/PCL/PPy 复合材料在变形温度为 65 ℃、应力为 2.14 MPa 的编程条件下，应变为 85.27% 时的形状恢复率（Rr）和形状固定率（Rf）分别为 81.11% 和 98.87%。PLA/PCL/PPy@NdFeB 复合材料除了具有优异的双重和三重形状记忆行为外，还具有明显的磁性能，可用于实现自编程临时形状。该研究旨在解决温度响应形状记忆聚合物在单一刺激响应模式下的局限性，拓宽其应用范围，进一步推动形状记忆聚合物的发展，为4D打印领域提供现实指导。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.