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| Preparation of pH-Responsive Shape Memory Composites by Phosphorylated Modified Cellulose Nanofibril and Polyurethane |
| Received:February 20, 2021 |
| DOI：10.11980/j.issn.0254-508X.2021.08.001 |
| Key Words:cellulose nanofiber polyurethane shape memory polymers pH-responsive |
| Fund Project:国家自然科学基金面上项目（31971610）。 |
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| Abstract:Phosphorylation of cellulose nanofibril （PCNF） with pH-sensitive was obtained by introducing phosphate groups into cellulose macromolecules. A shape memory material with pH-response was successfully prepared using solvent blending polyurethane （PU）. The shape memory properties of PCNF/PU composite （SMPU） with different PCNF additions under the condition of acid and base were investigated. The results showed that under acid-base conditions， PCNF-CL and PU molecules could reversibly produce a hydrogen bond association， which produced different effects to fix and restore the shape of the material. Under the condition of pH value = 1， the material could be processed into temporary shape with a fixation rate of 99.8%. When pH value was 13， it returned to original shape， and the recovery rate reached 99.5%. The mechanical tensile results showed that the mechanical strength of the SMPU composite material was significantly increased after adding PCNF-CL， and the tensile strength reached the maximum when the addition amount was 1%. |
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