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pH-Responsive Shape Memory Poly(ethylene glycol)-Poly(ε-caprolactone)-based Polyurethane/Cellulose Nanocrystals
Ying Li1, Hongmei Chen1, Dian Liu1
1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China.
ACS Applied Materials & Interfaces
|May 27, 2015
Summary
This study introduces a novel pH-responsive shape-memory polymer nanocomposite. By incorporating functionalized cellulose nanocrystals into a polyurethane matrix, researchers created a smart material with tunable shape-memory properties controlled by environmental pH.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Developing smart materials with tunable properties is crucial for advanced applications.
- Polyurethane (PECU) and cellulose nanocrystals (CNCs) are versatile materials with potential for functionalization.
- pH-responsive materials offer unique possibilities for controlled actuation and drug delivery.
Purpose of the Study:
- To develop a pH-responsive shape-memory polymer nanocomposite.
- To functionalize cellulose nanocrystals (CNCs) with pyridine moieties (CNC-C6H4NO2) and carboxyl groups (CNC-CO2H).
- To investigate the transfer of pH-responsiveness from functionalized CNCs to a polyurethane (PECU) matrix.
Main Methods:
- Functionalization of CNCs with pyridine-4-carbonyl chloride and TEMPO-mediated oxidation.
- Blending functionalized CNCs into a PECU polymer matrix.
- Rheological measurements to confirm nanocomposite network formation.
- Characterization of pH-responsive behavior and shape-memory properties.
Main Results:
- Functionalized CNCs exhibited pH-dependent hydrogen bonding interactions.
- The PECU/CNC nanocomposite showed improved mechanical properties.
- pH-responsiveness of CNCs was successfully transferred to the polymer nanocomposite.
- Shape-memory function was effectively controlled by environmental pH variations.
Conclusions:
- A novel pH-responsive shape-memory polymer nanocomposite was successfully developed.
- Functionalized CNCs act as switch units within the polymer matrix, enabling pH control.
- The developed material holds potential for applications as a new smart polymer material.
