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Updated: Jan 24, 2026

3D Printed Porous Cellulose Nanocomposite Hydrogel Scaffolds
Published on: April 24, 2019
High-performance polyurethane nanocomposites based on UPy-modified cellulose nanocrystals.
Donglin Tian1, Fenfen Wang1, Zhijun Yang1
1Key Laboratory of Functional Polymer Materials of the Ministry of Education and College of Chemistry, Nankai University, Tianjin 300071, China.
Researchers developed a bio-inspired method using densely hydrogen-bonding assemblies to create high-performance polyurethane (PU) nanocomposites. This approach enhances material strength and toughness by integrating cellulose nanocrystals (CNCs) functionalized with specific motifs.
Area of Science:
- Materials Science
- Polymer Science
- Biomaterials Engineering
Background:
- Nature utilizes dense hydrogen-bonding for robust yet tough natural polymers like spider silk.
- Synthesizing high-performance polymer nanocomposites with similar properties remains a significant challenge.
Purpose of the Study:
- To develop a bio-inspired strategy for fabricating high-performance polyurethane (PU) nanocomposites.
- To enhance mechanical properties of PU by reinforcing it with functionalized cellulose nanocrystals (CNCs).
Main Methods:
- Fabrication of PU nanocomposites using CNCs functionalized with 2-ureido-4-[1H]-pyrimidinone (UPy) motifs (CNC-UPy).
- Characterization using Differential Scanning Calorimetry (DSC) and Wide-Angle X-ray Diffraction (WAXD).
- Evaluation of mechanical properties including strength, elongation at break, and toughness.
Main Results:
- PU/CNC-UPy nanocomposites exhibited significantly improved mechanical strength and toughness without compromising elongation at break.
- CNC-UPy induced long-range ordering of hard segment domains in the PU matrix via strong hydrogen bonding.
- Enhanced strain-induced crystallization (SIC) was observed, leading to a higher stress at break.
Conclusions:
- The bio-inspired strategy effectively overcomes the stiffness-toughness trade-off in polymer composites.
- Strong interfacial hydrogen bonding between CNC and PU, facilitated by UPy, is key to property enhancement.
- This approach offers broad application prospects for advanced polymer nanocomposites.
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