Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 16, Pages 7611-7623Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c00404
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Funding
- National Natural Science Foundation of China [51773138]
- State Key Laboratory of Polymer Materials Engineering [sklpme2019-2-09]
- Opening Project of the Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, China
- Fundamental Research Funds for the Central Universities
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Lightweight shape memory thermoplastic polyurethane (TPU)/polylactide (PLA) foams with favorable mechanical properties and anti-shrinkage properties were prepared by a facile and green supercritical carbon dioxide foaming technology in this work. The introduction of cells enhanced the shape recovery ratio of TPU/PLA blends from 72.7 to 91.7% due to the good resilience and deformability of cells. Meanwhile, the existence of PLA and crystals in TPU/PLA foams improved the shape fixing ratio of TPU/PLA foams to 92.7% by restricting the movement of TPU molecular chains. The shape memory properties of TPU/PLA foams can be tuned by the control of the cell structure and expansion ratio. Additionally, the addition of PLA restrained the shrinkage of TPU/PLA foams, and the expansion ratio of TPU/PLA foams increased to 7.1. The mechanical properties of TPU/PLA foams were enhanced by the addition of PLA.
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