Title page for ETD etd-08232007-112703


Type of Document Dissertation
Author Lee, Sang-Hun
URN etd-08232007-112703
Title Supramolecular architectures :macrocycles, catenanes and polyrotaxanes
Degree PhD
Department Chemistry
Advisory Committee
Advisor Name Title
No Advisors Found
Keywords
  • polymer
  • polyrotaxane
  • macrocycle
  • radical polymerization
  • catenane
Date of Defense 1996-12-05
Availability restricted
Abstract

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-d6 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.

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