Thesis
Crystallization of semicrystalline side chain bearing bottlebrushes
Master of Science (M.S.), Drexel University
Jun 2023
DOI:
https://doi.org/10.17918/00001708
Abstract
The melting and crystallization behavior of a range of poly(ethylene oxide) side chain bearing molecular star bottlebrushes of varying grafting density has been investigated with differential scanning calorimetry and in-situ observation of spherulite growth with polarized light microscopy. The grafting density dependence of crystallinity, melt memory, isothermal crystallization kinetics, equilibrium melting temperature, and fold surface free energy are considered, finding that the increased steric hindrance on side chains from increased grafting density produces a strong melt memory effect past the equilibrium melting temperature. The decreasing contribution of the backbone as a crystalline defect with increased grafting density is exhibited by a decrease in the fold surface free energy, increase in crystallization temperature, and increase in melting temperature, as well as an upwards trend in the equilibrium melting temperature. The melting and crystallization behavior of a range of poly(ethylene oxide) and poly(caprolactone) side chain bearing bottlebrushes with a range of side chain loading and constant grafting density were analyzed by differential scanning calorimetry and in-situ fourier transform infrared spectroscopy with heating. The crystallization behavior of this system was similar to that of block copolymers of similar molecular weight, with confined crystallization exhibited at low side chain loading and PCL-first nucleation at equal side chain loading.
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Details
- Title
- Crystallization of semicrystalline side chain bearing bottlebrushes
- Creators
- Carl Thomas Furner
- Contributors
- Christopher Y. Li (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- viii, 73 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) (1970-2026); College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021047815504721