Journal
MACROMOLECULAR RESEARCH
Volume 30, Issue 7, Pages 438-445Publisher
POLYMER SOC KOREA
DOI: 10.1007/s13233-022-0058-0
Keywords
polylactic acid; polycaprolactone; ionic element; interfacial emulsification; crystallization
Categories
Funding
- National Natural Science Foundation of China [51903002]
- Natural Science Foundation of Anhui Education Department [KJ2019A0774, KJ2019JD18]
- Major science and technology projects of Anhui Province [201903a05020027]
- Anhui Jianzhu University PhD Startup Fund [2019QDZ22, 2018QD59]
- University Collaborative Innovation Project of Anhui province [GXXT-2019-017]
- WuHu Key Technology Major RD Projects [2020yf14]
- Research Fund for Postdoctoral Researchers in Anhui Province [2020B413]
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This study investigates the effects of adding polycaprolactone-polyethylene glycol oligomers and their derivative containing ionic elements on the properties of polylactic acid/polycaprolactone blends. The results show that the blends with added ionic elements have improved compatibility and mechanical properties.
The polycaprolactone (PCL)-b-polyethylene glycol (PEG) oligomer (Oli) and its derivative containing ionic elements (ILs) were used as interfacial compatibilizers and regulators, and the polylactic acid (PLA)/PCL/Oli and PLA/PCL/ILs blends were prepared by solution blending. The effects of Oli and ILs on the phase interfacial properties, aggregated structure, crystallization and mechanical properties of PLA/PCL blends were systematically studied. The results show that the ILs with strong interfacial emulsification ability can improve the dispersion of PCL in PLA matrix, and enhance the two-phase interfacial adhesion. When the content of ILs is 5 %, ion clusters can form and alleviate the restricted crystallization of PCL, and promote the segment movement of PLA through the non-covalent bonding of ionic elements. So the crystallization ability of PLA and PCL improve simultaneously. ILs have a strong regulatory effect on the phase interfacial morphology and aggregated structure of PLA/PCL blends, and the PLA/PCL blends containing high content of 5 % ILs can significantly improve the mechanical properties of PLA/PCL blends.
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