Development of Multiwalled Carbon Nanotubes/Halloysite Nanotubes Reinforced Thermal Responsive Shape Memory Polymer Nanocomposites for Enhanced Mechanical and Shape Recovery Characteristics in 4D Printing Applications
Abstract
:1. Introduction
2. Materials and Characterization
2.1. Details of Shape-Memory Polymer and Specifications of Reinforcements
2.2. Processing of Shape-Memory Polymer Nanocomposites and 4D Printing
2.3. Differential Scanning Calorimetry (DSC) Test
2.4. Scanning Electron Microscopy (SEM) Test
2.5. Tensile Test
2.6. Flexural Test
2.7. Flexural Tests for Multiple Cycles
2.8. Shape-Recovery Test
2.9. Impact Test
3. Results and Discussion
3.1. Differential Scanning Calorimetry Results
3.2. Scanning Electron Microscopy Results
3.3. Results of the Uni-Axial Tensile Test
3.4. Flexural Test Results
3.5. Flexural Test Results for Repeated Cycles
3.6. Shape-Recovery Test Results
3.7. Impact Test Results
4. Conclusions
- The addition of reinforcements in the SMP matrix significantly affected the tensile strength and percentage of elongation. The HNT-reinforced specimens exhibited higher tensile than the MWCNT-reinforced specimens. At 1 wt%, the HNT-reinforced specimens showed 34% higher tensile strength than the MWCNT-reinforced specimens. At the same time, HNT-reinforced samples exhibited higher brittleness than that MWCNT-reinforced specimens.
- At all the weight percentages considered, HNT-reinforced specimens exhibited greater flexural strength when compared with MWCNT-reinforced specimens. The highest observed flexural strength was at 1 wt% of HNTs, which was about 57% higher than that of 1 wt% MWCNT-reinforced specimens.
- Flexural tests were repeated for three cycles for all the composites. A reduction in flexural strength can be observed after each cycle. Further, the % of this reduction was more in the case of MWCNT-reinforced specimens than that of HNT-reinforced specimens. This indicates better reusability with HNT-reinforced specimens even after a large bending deformation.
- Both reinforcements significantly reduced the shape-recovery time. For all the considered cases, 1 wt% MWCNT-reinforced specimens exhibited a quicker shape-recovery response, which was 38% faster than 1 wt% HNT-reinforced specimens.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
SMPU | Shape-memory polyurethane |
MWCNTs | Multiwalled carbon nanotubes |
HNTs | Halloysite nanotubes |
SMPs | Shape-memory polymers |
SMPPs | Shape-memory polymer pellets |
Angle of the sample in undeformed/permanent shape | |
Angle of the sample in deformed/temporary shape |
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Reinforcement | MWCNTs | HNTs |
---|---|---|
Purity (%) | 99 | 99.9 |
Diameter (nm) | 5–20 | 15 |
Length (µm) | 10 | 1–15 |
Thermal conductivity (W/mK) | 0.35 | 0.092 |
Density (Kg/m3) | 2100 | 2540 |
Specific heat capacity (J/kgK) | 550 | 920 |
Thermal Diffusivity (mm2/s) | 0.303 | 0.039 |
Printing Parameter | Value |
---|---|
Layer height (mm) | 0.2 |
Print speed | 30 mm/s |
Nozzle temperature | 220 °C |
Print-bed temperature | 60 °C |
Printing Pattern | 45° and 135° |
Type of Reinforcement | % of Reinforcement | Tg (°C) | Tm (°C) |
---|---|---|---|
Pure SMPU | 0 | 56.5 | 163 |
MWCNTs | 0.5 | 63 | 171 |
1 | 69 | 182 | |
HNTs | 0.5 | 62 | 168 |
1 | 66 | 177 |
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Namathoti, S.; Vakkalagadda, M.R.K. Development of Multiwalled Carbon Nanotubes/Halloysite Nanotubes Reinforced Thermal Responsive Shape Memory Polymer Nanocomposites for Enhanced Mechanical and Shape Recovery Characteristics in 4D Printing Applications. Polymers 2023, 15, 1371. https://doi.org/10.3390/polym15061371
Namathoti S, Vakkalagadda MRK. Development of Multiwalled Carbon Nanotubes/Halloysite Nanotubes Reinforced Thermal Responsive Shape Memory Polymer Nanocomposites for Enhanced Mechanical and Shape Recovery Characteristics in 4D Printing Applications. Polymers. 2023; 15(6):1371. https://doi.org/10.3390/polym15061371
Chicago/Turabian StyleNamathoti, Sivanagaraju, and Manikanta Ravindra Kumar Vakkalagadda. 2023. "Development of Multiwalled Carbon Nanotubes/Halloysite Nanotubes Reinforced Thermal Responsive Shape Memory Polymer Nanocomposites for Enhanced Mechanical and Shape Recovery Characteristics in 4D Printing Applications" Polymers 15, no. 6: 1371. https://doi.org/10.3390/polym15061371