聚乳酸
聚己内酯
材料科学
纳米复合材料
结晶
异氰酸酯
复合材料
己内酯
化学工程
聚合物
聚氨酯
聚合
工程类
作者
Hao Liu,Chengdi Li,Simin Chen,Ping Chen,Jinbo Li,Huihua Jian,Guo Guo-yi,Xiao Chen,Xinyuan Zhu,Jun Wu
出处
期刊:Polymers
[MDPI AG]
日期:2023-03-20
卷期号:15 (6): 1533-1533
被引量:4
标识
DOI:10.3390/polym15061533
摘要
In this work, 3D printed polylactic acid (PLA)/polycaprolactone (PCL) nanocomposites with favorable thermo-responsive cyclic shape memory effects (SMEs) and crystallization and mechanical properties were fabricated using a two-step method. First, an isocyanate-terminated PCL diol (PCL-NCO) was synthesized through the reaction between isocyanate groups of hexamethylene diisocyanate and active hydroxyl groups of PCL diol, and its physicochemical properties were characterized. A PLA/PCL blend with a PCL content of 50 wt% was fabricated via fused filament fabrication (FFF) 3D printing, and the influence of the PCL-NCO on the SME of the PLA/PCL blend was studied. The results indicated that the PCL-NCO significantly improved the cyclic shape memory performance of 3D printed PLA/PCL blends and was proved to be an effective interface compatibilizer for the blend system. Subsequently, the structure and properties of 3D printed PLA/PCL nanocomposites were investigated in detail by adding cellulose nanocrystal-organic montmorillonite (CNC-OMMT) hybrid nanofillers with different contents. It was found that the hybrid nanofillers greatly enhanced crystallization and mechanical properties of the nanocomposites due to adequate dispersion. The modification of the PLA/PCL blend and the preparation of the 3D printed nanocomposite can not only prolong the service life of a shape memory polymer product, but also broaden its application scope in advanced fields.
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