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
  • polymer
  • polyrotaxane
  • macrocycle
  • radical polymerization
  • catenane
Date of Defense 1996-12-05
Availability restricted

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.

  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V856_1996.L449.pdf 8.74 Mb 00:40:27 00:20:48 00:18:12 00:09:06 00:00:46
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.