Article
Materials Science, Composites
Hossein Ebrahimi, Farhad Sharif, Ahmad Ramazani SA
Summary: The synthesis of nanocomposites through in situ grafting polymerization in the presence of modified titanium dioxide nanoparticles has successfully produced copolymers with different structures, among which the nanocomposite with a LLA/CL mass ratio of 70/30 exhibits the best mechanical properties.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Applied
Aoi Nakashima, Kaho Kohori, Kazuya Yamamoto, Jun-ichi Kadokawa
Summary: Chitin hexanoate-graft-poly(epsilon-caprolactone) (ChHex-g-PCL) was found to be thermoplastic, and the thermoplasticity was confirmed by the formation of a melt-pressed film. Chitin hexanoates were prepared by hexanoylation of chitin and then the surface-initiated ring-opening graft polymerization of epsilon-caprolactone was conducted to graft PCL chains onto the hydroxy groups of chitin hexanoates. The molar substitution and degree of polymerization of the PCL graft chains were influenced by the catalyst, reaction time, and degree of substitution.
CARBOHYDRATE POLYMERS
(2022)
Article
Polymer Science
Krzysztof Kaluzynski, Julia Pretula, Piotr Lewinski, Slawomir Kazmierski, Stanislaw Penczek
Summary: Poly(epsilon-caprolactone) and polylactide are biocompatible and biodegradable polymers, with existing methods of functionalization based on copolymerization or introducing special end groups. This study presents a method where special end groups are introduced through chain polymerization to achieve functionalization.
Article
Polymer Science
Abderrahmane Nabgui, Taha El Assimi, Abdellatif El Meziane, Gerrit A. Luinstra, Mustapha Raihane, Geraldine Gouhier, Pascal Thebault, Khalid Draoui, Mohammed Lahcini
Summary: In this study, a bio-nanocomposite based on poly (epsilon-caprolactone) & bentonite nanofiller was prepared through in-situ ring opening polymerization. The resulting composite material showed improved physicochemical properties and exhibited antimicrobial activity against S. epidermidis and S. aureus.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Engineering, Environmental
Gokhan Acik
Summary: A photo-induced and completely metal catalyst-free synthetic pathway has been proposed for the preparation of a bio-based heterograft copolymer. The copolymer consisting of poly(acrylic acid) and poly(epsilon-caprolactone) pendant groups is synthesized on the soybean oil backbone. The successful synthesis of both the required intermediates and the targeted polymers has been confirmed through spectroscopic, chromatographic, wettability, and thermal investigations.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Chemistry, Applied
Cristina Maquilon, Francesco Della Monica, Bart Limburg, Arjan W. Kleij
Summary: An operationally mild, ruthenium-based photocatalytic protocol has been developed for the conversion of gamma-mono- and gamma,gamma-disubstituted allyl carbonates to substituted six-membered cyclic carbonates. The variation and diversification of carbonate ring substitution provides access to new monomers useful in ring-opening polymerization, leading to polycarbonates with potentially tailored properties.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Polymer Science
Alexander A. Puchkov, Nikita G. Sedush, Alexander I. Buzin, Timur N. Bozin, Artem V. Bakirov, Roman S. Borisov, Sergei N. Chvalun
Summary: The main goal of this research is to study the ring-opening polymerization of L-lactide in the presence of multifunctional alcohols in order to determine the optimal conditions for synthesizing star-shaped molecules with predetermined structures for biomedical applications. The study found that the polymerization rate and initiation rate of co-initiator's hydroxyl groups can vary significantly depending on the alcohol's structure and concentration. Various instrumental methods were used to prove the absence of cyclic, linear, and comet-like structures in the synthesized star-shaped PLLA. Additionally, DSC and WAXS analysis showed that branching limits segmental mobility of the PLLA chains and hinders crystallization of the star-shaped poly(L-lactides).
Article
Polymer Science
Supriya Atta, Jarrod Cohen, Joachim Kohn, Adam J. Gormley
Summary: Ring opening polymerization (ROP) is typically conducted using anhydrous reagents and inert atmosphere, which are barriers for non-experts. Here, two new techniques for limited ROP of epsilon-caprolactone (CL) without pre-drying reagents were developed using a laboratory oven. By evaporating water in a vacuum oven or polymerizing through water with titanium isopropoxide (TTIP), variable chain lengths and molecular weight distributions of PCL were achieved, with TTIP showing better performance for higher molecular weights and block copolymer formation.
Article
Chemistry, Multidisciplinary
Hui Li, Jerome Ollivier, Sophie M. Guillaume, Jean-Francois Carpentier
Summary: This study reports the first chemical synthesis of poly(3-thiobutyrolactone) (P3TB) through ring-opening polymerization. The reactions proceed rapidly in the presence of various metal-based catalysts, and high selectivity can be achieved by manipulating reaction conditions and catalyst systems. The topology and stereochemistry of the resulting polymer have been characterized.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Biochemical Research Methods
Mi Li, Yunqiao Pu, Fang Chen, Arthur J. Ragauskas
Summary: Modification of lignin with poly(epsilon-caprolactone) improves the quality of lignin and enhances its compatibility and dispersion in solvents. Lignins from different sources and extraction methods all showed good reactivity in copolymerization reactions.
Article
Chemistry, Analytical
Tugba Celiker, Faezeh Ghorbanizamani, Hichem Moulahoum, Emine Guler Celik, Kerem Tok, Figen Zihnioglu, Candan Cicek, Ruchan Sertoz, Bilgin Arda, Tuncay Goksel, Kutsal Turhan, Suna Timur, Yusuf Yagci
Summary: A rapid and easy immunofluorescence bioassay for SARS-CoV-2 detection was developed using a one-pot synthetic approach for the production of a graft fluorescent copolymer PPy-g-PCL. The assay showed a detection range of 6.03-8.7 LOG viral copy mL(-1) and a high correlation with RT-PCR data. This study provides new insights for simplified synthesis procedures of reporter molecules and their potential applications in sensing and diagnosis.
Article
Polymer Science
Christopher B. Keller, Susan E. Walley, Curtis W. Jarand, Jibao He, Muhammad Ejaz, Daniel A. Savin, Scott M. Grayson
Summary: By grafting linear-bottlebrush amphiphilic copolymers onto the surface of silica nanoparticles, nanoparticle micelles with the ability to encapsulate and stabilize non-polar structures in aqueous media were successfully formed. These nanoparticles not only enhance oil encapsulation, but also provide an alternative dispersant system to address oil pollution in the environment.
Article
Polymer Science
Charalampos Pronoitis, Minna Hakkarainen, Karin Odelius
Summary: By rational design of the microstructure of PHUs and utilizing solubility as an enabling tool, complex architectures can be realized with benign reagents and atom-economical reactions, without harsh reaction conditions and solvents. This approach expands the synthetic intricacy for PHUs and could potentially broaden their applications and opportunities in the future.
Article
Polymer Science
Wanich Limwanich, Puttinan Meepowpan, Montira Sriyai, Tawan Chaiwon, Winita Punyodom
Summary: Biodegradable poly(epsilon-caprolactone) (PCL) was successfully synthesized through a green polymerization process without heavy metal catalyst and toxic solvent. L-Lactic (LLA) and glycolic acids (GA) were used as initiators, producing PCL with different molecular weights in the absence of water. Non-isothermal DSC analysis showed that GA had higher reactivity than LLA in epsilon-CL ROP, and proposed the polymerization mechanism initiated by LLA and GA.
Article
Polymer Science
Winita Punyodom, Boontharika Thapsukhon, Puttinan Meepowpan, Wanich Limwanich
Summary: Dibutyltin(IV) maleate (DBTML) was successfully used as a new initiator in the ring-opening polymerization (ROP) of epsilon-caprolactone (epsilon-CL) under solvent-free conditions. The effect of DBTML concentration on the reaction was studied, and the activation energy and frequency factor were determined using different methods. Proton-nuclear magnetic resonance spectroscopy (H-1-NMR) revealed that the reaction proceeds via a coordination-insertion mechanism. In bulk polymerization, DBTML could produce poly(epsilon-caprolactone) (PCL) with specific weight average molecular weights and polydispersity indexes.
Article
Biochemical Research Methods
Hsiao-Tieh Hsu, Brian M. Trantow, Robert M. Waymouth, Paul A. Wender
BIOCONJUGATE CHEMISTRY
(2016)
Article
Chemistry, Inorganic & Nuclear
Srinivasan Ramakrishnan, Kate M. Waldie, Ingolf Warnke, Antonio G. De Crisci, Victor S. Batista, Robert M. Waymouth, Christopher E. D. Chidsey
INORGANIC CHEMISTRY
(2016)
Article
Chemistry, Physical
Jaewon Lee, Huazhang Zhu, Gautam Ganapati Yadav, James Caruthers, Yue Wu
Article
Chemistry, Physical
Paul D. Pletcher, Jeffrey M. Switzer, D. Keith Steelman, Grigori A. Medvedev, W. Nicholas Delgass, James M. Caruthers, Mahdi M. Abu-Omar
Article
Polymer Science
Thilina Gunasekara, Jungsuk Kim, Silei Xiong, Andrew Preston, D. Keith Steelman, Grigori A. Medvedev, W. Nicholas Delgass, James M. Caruthers, Mandi M. Abu-Omar
Article
Chemistry, Inorganic & Nuclear
Andrew Z. Preston, Jungsuk Kim, Grigori A. Medvedev, W. Nicholas Delgass, James M. Caruthers, Mandi M. Abu-Omar
Article
Chemistry, Physical
Thilina Gunasekara, Jungsuk Kim, Andrew Preston, D. Keith Steelman, Grigori A. Medvedev, W. Nicholas Delgass, Orson L. Sydora, James M. Caruthers, Mandi M. Abu-Omar
Article
Materials Science, Multidisciplinary
J. M. Caruthers, G. A. Medvedev
PHYSICAL REVIEW MATERIALS
(2018)
Article
Chemistry, Physical
Jeffrey M. Switzer, Paul D. Pletcher, D. Keith Steelman, Jungsuk Kim, Grigori A. Medvedev, Mandi M. Abu-Omar, James M. Caruthers, W. Nicholas Delgass
Article
Polymer Science
Grigori A. Medvedev, James M. Caruthers
Article
Chemistry, Physical
Jack C. Yungbluth, Grigori A. Medvedev, Brett M. Savoie, James M. Caruthers
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Polymer Science
Yelin Ni, Hosup Song, Daniel A. Wilcox, Grigori A. Medvedev, Bryan W. Boudouris, James M. Caruthers
Article
Polymer Science
Yelin Ni, Grigori A. Medvedev, David B. Curliss, James M. Caruthers
Article
Engineering, Chemical
Hosup Song, Grigori A. Medvedev, James M. Caruthers
Summary: This study investigates the effects of annealing a glassy polymer at temperatures well below T-g on its dynamic linear viscoelastic properties. The results show that with increasing annealing temperature, the storage isotherms of the material increase while the loss isotherms decrease.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Chemistry, Physical
J. C. Yungbluth, G. A. Medvedev, B. M. Savoie, J. M. Caruthers
Summary: This study uses molecular dynamics simulations to find a simple functional relationship between a structural property and the temperature dependent translational diffusion coefficient. The relationship is described by the mean squared-force per molecule, F-2, and holds for various systems and different temperature ranges. This discovery sheds light on the physical mechanisms governing molecular mobility in liquids.
JOURNAL OF CHEMICAL PHYSICS
(2023)