Synthesis and characterization of ring-opening metathesis polymers with pendant carborane groups

A series of ring-opening metathesis (ROMP) polymers functionalized with pendant carborane (C2B10HI2) groups was synthesized. Norbomene-based polymers with the bulky, pseudoaromatic functionality were found to have glass transition temperatures (Tg's) between 29 °C and 290 °C. This variation in Tg can be attributed to structural differences in how the functional group is attached to the polymer backbone. Block copolymerization was used to improve the material processibility. The block copolymers microphase separate into boron-rich and boron-free microdomains. Carborane-functionalized monomers and polymers were used as precursors and models for the synthesis of polyanions with pendant cobalt dicarbollide (Co(C2B9H)2 -l) and carborane anion (CB1 H12-) groups via ROMP. These polyelectrolytes were found to work as hydrophilic ion-exchangers in aqueous acidic solutions. Polymers functionalized with either cobalt dicarbollide or carborane anions demonstrated selective binding of cesium over sodium. Copolymerization and cross-linking were used to reduce the hydrophilicity and solubility of the materials in a stripping solution of strong (8M) nitric acid.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

1999

Author dc:creator

• Man, Alice (Alice Mei-Ling), 1972-

Advisor dc:contributor.advisor

• Robert E. Cohen.

• Materials Science and Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/28221

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/28221