Imperial College London

PROFESSOR CHARLOTTE K. WILLIAMS

Faculty of Natural SciencesDepartment of Chemistry

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 5790c.k.williams Website

 
 
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Location

 

317 RCS1ChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

148 results found

Noimark S, Weiner J, Noor N, Allan E, Williams CK, Shaffer MSP, Parkin IPet al., 2015, Dual-Mechanism Antimicrobial Polymer-ZnO Nanoparticle and Crystal Violet-Encapsulated Silicone, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 1367-1373, ISSN: 1616-301X

JOURNAL ARTICLE

Paul S, Romain C, Shaw J, Williams CKet al., 2015, Sequence Selective Polymerization Catalysis: A New Route to ABA Block Copoly(ester-b-carbonate-b-ester), MACROMOLECULES, Vol: 48, Pages: 6047-6056, ISSN: 0024-9297

JOURNAL ARTICLE

Paul S, Zhu Y, Romain C, Brooks R, Saini PK, Williams CKet al., 2015, Ring-opening copolymerization (ROCOP): synthesis and properties of polyesters and polycarbonates, CHEMICAL COMMUNICATIONS, Vol: 51, Pages: 6459-6479, ISSN: 1359-7345

JOURNAL ARTICLE

Romain C, Bennington MS, White AJP, Williams CK, Brooker Set al., 2015, Macrocyclic Dizinc(II) Alkyl and Alkoxide Complexes: Reversible CO2 Uptake and Polymerization Catalysis Testing, INORGANIC CHEMISTRY, Vol: 54, Pages: 11842-11851, ISSN: 0020-1669

JOURNAL ARTICLE

Romain C, Williams CK, 2015, Combining Sustainable Polymerization Routes for the Preparation of Polyesters, Polycarbonates, and Copolymers, Editors: Cheng, Gross, Smith, Publisher: AMER CHEMICAL SOC, Pages: 135-146, ISBN: 978-0-8412-3065-1

BOOK CHAPTER

Thevenon A, Garden JA, White AJP, Williams CKet al., 2015, Dinuclear Zinc Salen Catalysts for the Ring Opening Copolymerization of Epoxides and Carbon Dioxide or Anhydrides, INORGANIC CHEMISTRY, Vol: 54, Pages: 11906-11915, ISSN: 0020-1669

JOURNAL ARTICLE

Winkler M, Romain C, Meier MAR, Williams CKet al., 2015, Renewable polycarbonates and polyesters from 1,4-cyclohexadiene, GREEN CHEMISTRY, Vol: 17, Pages: 300-306, ISSN: 1463-9262

JOURNAL ARTICLE

Yi N, Unruangsri J, Shaw J, Williams CKet al., 2015, Carbon dioxide capture and utilization: using dinuclear catalysts to prepare polycarbonates, FARADAY DISCUSSIONS, Vol: 183, Pages: 67-82, ISSN: 1359-6640

JOURNAL ARTICLE

Zhu Y, Romain C, Poirier V, Williams CKet al., 2015, Influences of a Dizinc Catalyst and Bifunctional Chain Transfer Agents on the Polymer Architecture in the Ring-Opening Polymerization of epsilon-Caprolactone, Macromolecules, Vol: 48, Pages: 2407-2416, ISSN: 0024-9297

The polymerization of ε-caprolactone is reported using various bifunctional chain transfer agents and a dizinc catalyst. Conventionally, it is assumed that using a bifunctional chain transfer agent (CTA), polymerization will be initiated from both functional groups; however, in this study this assumption is not always substantiated. The different architectures and microstructures of poly(ε-caprolactone) samples (PCL) are compared using a series of bifunctional and monofunctional alcohols as the chain transfer agents, including trans-1,2-cyclohexanediol (CHD), ethylene glycol (EG), 1,2-propanediol (PD), poly(ethylene glycol) (PEG), 2-methyl-1,3-propanediol (MPD), 1-hexanol, 2-hexanol, and 2-methyl-2-pentanol. A mixture of two architectures is observed when diols containing secondary hydroxyls are used, such as cyclohexanediol or propanediol; there are chains that are both chain-extended and chain-terminated by the diol. These findings indicate that not all secondary hydroxyl groups initiate polymerization. In contrast, chain transfer agents containing only primary hydroxyl groups in environments without steric hindrance afford polymer chains of a single chain extended architecture, whereby polymer chains are initiated from both hydroxyl groups on the diol. Kinetic analyses of the polymerizations indicate that the propagation rate constant (kp) is significantly higher than the initiation rate constant (ki): kp/ki > 5. A kinetic study conducted using a series of monofunctional chain transfer agents shows that the initiation rate, ki, is dependent on the nature of the hydroxyl group, with the rates decreasing in the order ki(primary) > ki(secondary) > ki(tertiary). It is proposed that two polymer architectures are present as a consequence of slow rates of initiation from the secondary hydroxyl groups, on the diol, compared to propagation which occurs from a primary hydroxyl group. In addition to the reactivity differences of the alcohols, steric

JOURNAL ARTICLE

Zhu Y, Romain C, Williams CK, 2015, Selective Polymerization Catalysis: Controlling the Metal Chain End Group to Prepare Block Copolyesters, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 137, Pages: 12179-12182, ISSN: 0002-7863

JOURNAL ARTICLE

Zhu Y, Williams CK, 2015, Biodegradable thermoplastic elastomer from multi-block copolyester

PATENT

Bakewell C, White AJP, Long NJ, Williams CKet al., 2014, Metal-Size Influence in Iso-Selective Lactide Polymerization, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 53, Pages: 9226-9230, ISSN: 1433-7851

JOURNAL ARTICLE

Brown NJ, Harris JE, Yin X, Silverwood I, White AJP, Kazarian SG, Hellgardt K, Shaffer MSP, Williams CKet al., 2014, Mononuclear Phenolate Diamine Zinc Hydride Complexes and Their Reactions With CO2, ORGANOMETALLICS, Vol: 33, Pages: 1112-1119, ISSN: 0276-7333

JOURNAL ARTICLE

Duran B, Hartig E, Draper E, Snyder R, DeGanga C, Williams CK, Haaf Met al., 2014, Tri- and tetra-dentate quinolide organometallic catalysts for stereocontrolled rac-lactide polymerization, 247th National Spring Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Montrikittiphant T, Tang M, Lee K-Y, Williams CK, Bismarck Aet al., 2014, Bacterial Cellulose Nanopaper as Reinforcement for Polylactide Composites: Renewable Thermoplastic NanoPaPreg, MACROMOLECULAR RAPID COMMUNICATIONS, Vol: 35, Pages: 1640-1645, ISSN: 1022-1336

JOURNAL ARTICLE

Montrikittiphant T, Tang M, Lee KY, Williams CK, Bismarck Aet al., 2014, Macromol. Rapid commun. 19/2014., Macromol Rapid Commun, Vol: 35

Frontispiece: A Werkstoffverbund (laminated composite) manufacturing concept is used to produce high performance renewable bacterial cellulose (BC) nanopaper reinforced thermoplastic laminates. The mechanical performance of the resulting BC-reinforced thermoplastic laminates is found to be dependent on the tensile performance of the reinforcing BC nanopaper. Further details can be found in the article by T. Montrikittiphant, M. Tang, K.-Y. Lee,* C. K. Williams, and A. Bismarck* on page 1640.

JOURNAL ARTICLE

Romain C, Williams CK, 2014, Chemoselective Polymerization Control: From Mixed-Monomer Feedstock to Copolymers, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 53, Pages: 1607-1610, ISSN: 1433-7851

JOURNAL ARTICLE

Romain C, Williams CK, 2014, Chemoselective polymerization control: From mixed monomer feedstock to copolymers, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Saini PK, Romain C, Williams CK, 2014, Dinuclear metal catalysts: improved performance of heterodinuclear mixed catalysts for CO2-epoxide copolymerization, CHEMICAL COMMUNICATIONS, Vol: 50, Pages: 4164-4167, ISSN: 1359-7345

JOURNAL ARTICLE

Saini PK, Romain C, Williams CK, 2014, Dinuclear metal catalysts: Improved performance of heterodinuclear mixed catalysts for CO2-epoxide copolymerization, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Saini PK, Romain C, Zhu Y, Williams CKet al., 2014, Di-magnesium and zinc catalysts for the copolymerization of phthalic anhydride and cyclohexene oxide, POLYMER CHEMISTRY, Vol: 5, Pages: 6068-6075, ISSN: 1759-9954

JOURNAL ARTICLE

Silverwood IP, Keyworth CW, Brown NJ, Shaffer MSP, Williams CK, Hellgardt K, Kelsall GH, Kazarian SGet al., 2014, An Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) Spectroscopic Study of Gas Adsorption on Colloidal Stearate-Capped ZnO Catalyst Substrate, APPLIED SPECTROSCOPY, Vol: 68, Pages: 88-94, ISSN: 0003-7028

JOURNAL ARTICLE

Weiner J, Brown NJ, Shaffer MSP, Williams CKet al., 2014, Colloidal ZnO/Cu hybrid nanocatalysts for CO2 hydrogenation to methanol, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Williams CK, Bakewell C, Long N, Auffrant Aet al., 2014, Stereoblock polylactide: New, highly active, and iso-selective catalysts based on group 3/lanthanide phosphasalen complexes, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Bakewell C, Thi-Phuong-Anh C, Le Goff XF, Long NJ, Auffrant A, Williams CKet al., 2013, Yttrium Phosphasalen Initiators for rac-Lactide Polymerization, ORGANOMETALLICS, Vol: 32, Pages: 1475-1483, ISSN: 0276-7333

JOURNAL ARTICLE

Bakewell C, White AJP, Long NJ, Williams CKet al., 2013, 8-Quinolinolato Gallium Complexes: Iso-selective Initiators for rac-Lactide Polymerization, INORGANIC CHEMISTRY, Vol: 52, Pages: 12561-12567, ISSN: 0020-1669

JOURNAL ARTICLE

Bakewell CM, Thi-Phuong-Anh C, Haaf M, Williams CK, Long NJ, Auffrant A, Platel RHet al., 2013, Bis(quinolinolato)aluminium ethyl and yttrium phosphasalen complexes: New iso-selective initiators for rac-lactide ring-opening polymerisation, 245th National Spring Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Brown NJ, Weiner J, Hellgardt K, Shaffer MSP, Williams CKet al., 2013, Phosphinate stabilised ZnO and Cu colloidal nanocatalysts for CO2 hydrogenation to methanol, CHEMICAL COMMUNICATIONS, Vol: 49, Pages: 11074-11076, ISSN: 1359-7345

JOURNAL ARTICLE

Brown NJ, Weiner J, Shaffer MSP, Williams CKet al., 2013, Tuneable ZnOCu catalyst system for CO2 hydrogenation to methanol, 245th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Donaghey JE, Sohn E-H, Ashraf RS, Anthopoulos TD, Watkins SE, Song K, Williams CK, McCulloch Iet al., 2013, Pyrroloindacenodithiophene polymers: the effect of molecular structure on OFET performance, POLYMER CHEMISTRY, Vol: 4, Pages: 3537-3544, ISSN: 1759-9954

JOURNAL ARTICLE

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