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29 results on '"Coffin, Robert C."'

2. Binuclear initiators for the telechelic synthesis of elastomeric polyolefins

Author

Coffin, Robert C., Schneider, Yanika, Kramer, Edward J., and Bazan, Guillermo C.

Subjects
Olefins -- Structure, Olefins -- Chemical properties, Elasticity -- Analysis, Nickel -- Chemical properties, Nickel -- Mechanical properties, Organometallic compounds -- Structure, Organometallic compounds -- Chemical properties, Organometallic compounds -- Mechanical properties, Polymers -- Structure, Polymers -- Chemical properties, Polymers -- Mechanical properties, Chemistry
Abstract

Novel binuclear complexes are prepared by linking two nickel centers through a bis(benzyl) fragment. Monotonic and step-cyclic stress-strain tests have shown that the materials have displayed large strains at break and excellent elastic recoveries at large strains and that materials with desirable properties are not achieved by using a mononuclear initiator has shown the advantage of growing the polymer via a telechelic mechanism.

Published
2010

3. New polyethylene macroinitiators and their subsequent grafting by atom transfer radical polymerization

Author

Schneider, Yanika, Azoulay, Jason D., Coffin, Robert C., and Bazan, Guillermo C.

Subjects
Polyethylene -- Structure, Methyl groups -- Structure, Chemistry
Abstract

The new method has provided an access to polyethylene (PE)-graft-poly methyl methacrylate (PMMA) with excellent control over the structural properties of the macroinitiator and the resulting graft copolymers. The key element is the initiation in the absence of 5-norbornen-2-yl-2'-bromo-2'-methyl propanoate, which has decomposed Ni[(COD).sub.2].

Published
2008

5. Decacyclene Triimides: Paving the Road to Universal Non‐Fullerene Acceptors for Organic Photovoltaics

Author

Pho, Toan V., primary, Toma, Francesca M., additional, Tremolet de Villers, Bertrand J., additional, Wang, Sarah, additional, Treat, Neil D., additional, Eisenmenger, Nancy D., additional, Su, Gregory M., additional, Coffin, Robert C., additional, Douglas, Jessica D., additional, Fréchet, Jean M. J., additional, Bazan, Guillermo C., additional, Wudl, Fred, additional, and Chabinyc, Michael L., additional

Published
2013
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10. Roles of thermal annealing in cyclopentadithiophene/thienopyrroledione:fullerene blended film and performance of organic photovoltaics

Author

Zheng, Qiao, primary, Fang, Guojia, additional, Coffin, Robert C., additional, MacNeill, Christopher M., additional, Li, Yuan, additional, Sun, Nanhai, additional, Qin, Pingli, additional, Nie, Wanyi, additional, Peterson, Eric D., additional, Fan, Xi, additional, Cheng, Fei, additional, Huang, Huihui, additional, Wang, Mingjun, additional, Zhao, Xingzhong, additional, and Carroll, David, additional

Published
2011
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12. Macromol. Rapid Commun. 15/2011

Author

Nie, Wanyi, primary, MacNeill, Christopher M., additional, Li, Yuan, additional, Noftle, Ronald E., additional, Carroll, David L., additional, and Coffin, Robert. C., additional

Published
2011
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15. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b:4,5-b′]dithiophene/2,1,3-benzothiadiazole Copolymers

Author

Coffin, Robert C., primary, MacNeill, Christopher M., additional, Peterson, Eric D., additional, Ward, Jeremy W., additional, Owen, Jack W., additional, McLellan, Claire A., additional, Smith, Gregory M., additional, Noftle, Ronald E., additional, Jurchescu, Oana D., additional, and Carroll, David L., additional

Published
2011
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25. Decacyclene Triimides: Paving the Road to Universal Non-Fullerene Acceptors for Organic Photovoltaics.

Author

Pho, Toan V., Toma, Francesca M., Tremolet de Villers, Bertrand J., Wang, Sarah, Treat, Neil D., Eisenmenger, Nancy D., Su, Gregory M., Coffin, Robert C., Douglas, Jessica D., Fréchet, Jean M. J., Bazan, Guillermo C., Wudl, Fred, and Chabinyc, Michael L.

Subjects
PHOTOVOLTAIC cells, FULLERENES, HETEROJUNCTIONS, SOLAR cells, LIGHT absorption, PHOTOCURRENTS
Abstract

A novel n‐type material, an alkylated decacyclene triimide (DTI), is utilized in organic photovoltaic devices as the first non‐fullerene acceptor that performs efficiently with the benchmark donor polymer poly(3‐hexylthiophene) (P3HT) as well as various narrow band gap polymers. [ABSTRACT FROM AUTHOR]

Published
2014
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27. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b:4,5-b']dithiophene/ 2,1,3-benzothiadiazole Copolymers.

Author

Coffin, Robert C., MacNeill, Christopher M., Peterson, Eric D., Ward, Jeremy W., Owen, Jack W., McLellan, Claire A., Smith, Gregory M., Noftle, Ronald E., Jurchescu, Oana D., and Carroll, David L.

Subjects
MOLECULAR weights, COPOLYMERS, CHLOROFORM, ETHYLHEXANOL, ABSORPTION, THIN film transistors, SOLAR cells
Abstract

Through manipulation of the solubilizing side chains, we were able to dramatically improve the molecular weight (Mw) of 4,8-dialkoxybenzo[1,2-b:4,5-b']dithiophene (BDT)/2,1,3-benzothiadiazole (BT) copolymers. When dodecyl side chains (P1) are employed at the 4- and 8-positions of the BDT unit, we obtain a chloroform-soluble copolymer fraction with Mw of 6.3 kg/mol. Surprisingly, by moving to the commonly employed 2-ethylhexyl branch (P2), Mw decreases to 3.4 kg/mol. This is despite numerous reports that this side chain increases solubility and Mw. By moving the ethyl branch in one position relative to the polymer backbone (1-ethylhexyl, P3),Mw is dramatically increased to 68.8 kg/mol. As a result of this Mw increase, the shape of the absorption profile is dramatically altered, with λmax = 637 nm compared with 598 nm for P1 and 579 nm for P2. The hole mobility as determined by thin film transistor (TFT) measurements is improved from ∼ 1 × 10-6 cm²/Vs for P1 and P2 to 7 × 10-4 cm²/Vs for P3, while solar cell power conversion efficiency in increased to 2.91% for P3 relative to 0.31% and 0.19% for P1 and P2, respectively. [ABSTRACT FROM AUTHOR]

Published
2011
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