期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 193, 期 -, 页码 247-257出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.10.139
关键词
PLA; 3D printing; Hierarchical crystallization; Stereo-complexation; Resistance to hydrolysis; Thermal stability
资金
- Fundamental Research Funds for the Central Universities [JUSRP51907A]
- 111 projects [B17021]
- Youth Program of Basic Research Plan of Jiangnan University [JUSRP12030]
- Natural Science Foundation of Jiangsu Province [BK20180624]
- Industry-Academia Research Project of Jiangsu Province [BY2020443]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX17_1446]
A novel strategy was designed for complete stereo-complexation of PLA matrix in 3D printing by controlling hierarchical crystallization, achieving a 100% stereo-complexation level. The study showed that homo-crystallites anchored molecular chains of PLA during post-annealing, leading to high retention of tensile properties, while stereo-complexed crystallites improved hydrolytic and thermal resistance through stronger intermolecular interactions.
A novel strategy adaptive to 3D printing of PLA matrix for complete stereo-complexation was designed. Stereocomplexation has been demonstrated for its effectiveness in simultaneously improving aqueous stability and heat resistance of PLA. However, current techniques could not be directly incorporated into 3D printing of stereocomplexed PLA since stereo-complexed crystallites are easily formed before printing. High printing temperatures are thus required but decompose PLA materials at the same time. The hypothesis for this research is that controllable hierarchical crystallization in three thermal processes, the filament preparation, 3D printing and post annealing, could ensure feasibility of the strategy and a 100% stereo-complexation level in PLA matrices. Effects of extrusion, ambient and annealing temperatures on material structures were analyzed via WAXD, DSC and DMA. Resistance to hydrolysis and heat of the 3D printed PLA matrix was evaluated under practical conditions. It was showed that homo-crystallites anchored molecular chains of PLA during the post-annealing process for a high retention of tensile properties, while stereo-complexed crystallites provided stronger intermolecular interactions for improved hydrolytic and thermal resistance. This novel strategy via incorporating controlled hierarchical crystallization into 3D printing would enrich the fabrication and exploration of highperformance 3D printed PLA materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据