2026-09-20T04:20:42Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/282212022-01-13T07:54:33Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Robert E. Cohen.
Man, Alice (Alice Mei-Ling), 1972-
Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
Massachusetts Institute of Technology. Department of Materials Science and Engineering
2005-09-26T19:12:34Z
2005-09-26T19:12:34Z
1999
1999
http://hdl.handle.net/1721.1/28221
45277488
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
Includes bibliographical references (leaves 180-191).
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.
by Alice Man.
Ph.D.
191 leaves
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10354751 bytes
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Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Materials Science and Engineering.
Synthesis and characterization of ring-opening metathesis polymers with pendant carborane groups
Thesis
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<Abstract>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.</Abstract>
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