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Solution crystallization of poly(ethylene oxide) bottle brushes
Thesis   Open access

Solution crystallization of poly(ethylene oxide) bottle brushes

Xiting Liu
Master of Science (M.S.), Drexel University
Jun 2017
DOI:
https://doi.org/10.17918/wtpy-0394
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Abstract

Polyethylene oxide Materials Science
Polymer bottle brush (BB) as a newly developed polymer architecture has attracted a lot of attention in the materials science field. Polymer bottle brushes usually have high molecular weight and a worm-like shape. Polymer bottle brushes have side chains that are closely covalently bonded to a linear polymer backbone. Because of the close packing of side chains, the backbone is extended. Polymer bottle brushes are well-defined polymers by controlling the side chains, backbone and grafting density. The study of crystallization behavior of polymer bottle brush is essential for us to gain a better knowledge of polymer bottle brush. In this thesis study, we investigated the crystallization behavior of poly(ethylene oxide) BB (PEO-BB) in dilute solution. 5K PEO side chain was used as the side chain of the polymer bottle brush(BB). The degree of polymerization of backbone is 800 and the grafting density is controlled to be 76% and 48.6%. Uniformly spherical single crystals structure have been observed in PEO-BB. Furthermore, the size of the spherical crystals increases with the increasing crystallization temperature. Single layer structure transfers into a muti-lay structure when the concentration of the solution increases. Programmable growth was also conducted in this research, using different size of 300Klinear PEO single crystals as the seeds in the solution. A plethora of single crystal morphologies have been observed, and the detailed formation mechanism will be discussed.

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