Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 8, Pages 4289-4299Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202014299
Keywords
multishape memory; plant oil; processability; simultaneous self-healing; waterborne polyurethane
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Funding
- National Key Research and Development Program of China [2019YFD1101202, 2019YFD1101203]
- National Natural Science Foundation [51703068, 21602078]
- Guangdong Province Science & Technology Program [2018B030306016]
- Guangdong Provincial Innovation Team for General Key Technologies in Modern Agricultural Industry [2019KJ133]
- Program of the Science & Technology Department of Guangzhou, China [201803020039]
- Key Projects of Basic Research and Applied Basic Research of the Higher Education Institutions of Guangdong Province [2018KZDXM014]
- Guangzhou Municipal Key Laboratory of Woody Biomass Functional New Materials [201905010005]
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The newly developed multifunctional castor-oil-based waterborne polyurethane has high tensile strength and excellent self-healing efficiency, with the ability to fully recover its original mechanical properties after multiple reprocessings. The material exhibits a wide range of glass-transition temperatures, providing the films with versatile shape-memory effects.
Materials with multifunctionality or multiresponsiveness, especially polymers derived from green, renewable precursors, have recently attracted significant attention resulting from their technological impact. Nowadays, vegetable-oil-based waterborne polyurethanes (WPUs) are widely used in various fields, while strategies for simultaneous realization of their self-healing, reprocessing, shape memory as well as high mechanical properties are still highly anticipated. We report development of a multifunctional castor-oil-based waterborne polyurethane with high strength using controlled amounts of dithiodiphenylamine. The polymer networks possessed high tensile strength up to 38 MPa as well as excellent self-healing efficiency. Moreover, the WPU film exhibited a maximum recovery of 100 % of the original mechanical properties after reprocessing four times. The broad glass-transition temperature of the samples endowed the films with a versatile shape-memory effect, including a dual-to-quadruple shape-memory effect.
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