Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties
Abstract
:1. Introduction
2. Experimental
2.1. Materials
2.2. Epoxidation of BCP with m-CPBA
2.3. Sample Preparation
2.4. Molecular Characterization
2.5. Morphological Characterization
2.6. Dynamic Mechanical Analysis (DMA)
2.7. Mechanical Characterization
3. Results and Discussion
3.1. Validation of Epoxidation
3.2. Morphology and Phase Behavior
3.3. Mechanical Behavior
4. Conclusions
- The experimental condition for epoxidation of BCP under precisely controlled conditions was optimized for the first time.
- Varying degrees of epoxidation (38 mol%, 58 mol%, and 82 mol%) were attained and validated by FTIR, 1H-NMR and GPC analyses.
- A transition in nanostructured morphology from a lamellae-like structure (in the BCP) to a cylindrical structure (for the sample with the highest epoxidation grade) could be observed via TEM, accompanied by a significant shift in soft phase Tg values towards higher temperatures.
- The predominantly elastomeric property of the neat BCP was largely maintained while stiffness and tensile strength were enhanced by epoxidation.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample Code | Targeted DOE (mol%) | Calculated DOE (mol%) |
---|---|---|
ST3 | 0 | 0 |
epST3-38 | 50 | 38 |
epST3-57 | 80 | 57 |
epST3-82 | 100 | 82 |
Sample Code | Mn (g/mol) | Mw (g/mol) | Ð = Mw/Mn |
---|---|---|---|
ST | 82,000 | 172,500 | 2.1 |
epST-38 | 84,500 | 188,800 | 2.2 |
epST-57 | 88,300 | 201,200 | 2.3 |
epST-82 | 95,400 | 223,900 | 2.4 |
Sample | ET (MPa) | εB (%) | σB (MPa) |
---|---|---|---|
ST3 | 182 | 464 | 23.5 |
epST3-38 | 187 | 386 | 24.7 |
epST3-57 | 211 | 360 | 28.5 |
epST3-82 | 221 | 345 | 36.7 |
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Khatiwada, S.P.; Staudinger, U.; Jehnichen, D.; Heinrich, G.; Adhikari, R. Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties. Polymers 2021, 13, 96. https://doi.org/10.3390/polym13010096
Khatiwada SP, Staudinger U, Jehnichen D, Heinrich G, Adhikari R. Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties. Polymers. 2021; 13(1):96. https://doi.org/10.3390/polym13010096
Chicago/Turabian StyleKhatiwada, Shankar P., Ulrike Staudinger, Dieter Jehnichen, Gert Heinrich, and Rameshwar Adhikari. 2021. "Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties" Polymers 13, no. 1: 96. https://doi.org/10.3390/polym13010096
APA StyleKhatiwada, S. P., Staudinger, U., Jehnichen, D., Heinrich, G., & Adhikari, R. (2021). Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties. Polymers, 13(1), 96. https://doi.org/10.3390/polym13010096