Polyrotaxanes are molecular composites consisting of three components: linear polymers, bulky stoppers at the ends of polymer chains and macrocycles threaded by the polymers.
A series of tetraarylmethyl derivatives as blocking groups were synthesized. Using tris(p-ten-butylphenyl)( 4-hydroxyphenyl)methane a new blocking groupfmitiator (BO(mit) was synthesized. The BG(mit's ability of blockingfmitiation in free radical polymerizations was established by polymerization of styrene.
As cyclic components, aliphatic crown ethers (30-crown-lO, "42-crown-14" and "6O-crown-20") were synthesized by multi-piece combination methods. The purification of the crown ethers was achieved by treatment with poly(methacryloyl chloride), column chromatography and recrystallization; by NMR in DMSO-<i>d₆</i> the purity of the products was demonstrated. The 42-crown-based [2]catenane was isolated while synthesizing "42- crown-14" and characterized in terms of its physically interlocked structure. Two new hydrocarbon-based macrocycles were prepared by two-piece combination method. / Ph. D.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/39211 |
| Date | 23 August 2007 |
| Creators | Lee, Sang-Hun |
| Contributors | Chemistry, Gibson, Harry W., Dorn, Harry C., Marand, Herve, Merola, Joseph S., Tanko, James M. |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Dissertation, Text |
| Format | xix, 312 leaves, BTD, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 36867254, LD5655.V856_1996.L449.pdf |
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