Article
Polymer Science
Rebecca Mohr, Manfred Wagner, Sirus Zarbakhsh, Holger Frey
Summary: The combination of hydrophobic PDMS blocks with hydrophilic polyether segments plays a key role for silicone surfactants in this study. Using DMC catalyst, direct copolymerization of cyclic siloxanes and epoxides is achieved, leading to the formation of gradient PPO-PDMS copolymers. Contact angle measurements show increased hydrophobicity and a glass transition of -95 degrees C for copolymers with 46% SiO content.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Chemistry, Organic
Yao-Yao Zhang, Guan-Wen Yang, Guang-Peng Wu
Summary: The application of organocatalysts in polyether production has made significant progress, especially with the development of bifunctional organoboron catalysts that show excellent catalytic efficiency and controllability on molecular weight, bringing new possibilities to the field of polyether production.
Article
Chemistry, Organic
Jixiang Ni, Matteo Lanzi, Arjan W. Kleij
Summary: An unanticipated exo-cyclic nucleophilic attack of thiol reagents on vinyl cyclic carbonates is described, leading to the synthesis of allylic thioethers. This reaction pathway adds to the reactivity modes available for these heterocycles, complementing the previously reported endo-cyclic nucleophilic attack.
ORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Yanjiao Song, Jianghua He, Yuetao Zhang, Reid A. Gilsdorf, Eugene Y. -X. Chen
Summary: This study reports a method for synthesizing authentic cyclic acrylic polymers from bio-based monomers using a tethered B-P-B trifunctional catalyst. Detailed studies have revealed the initiation and propagation mechanism, and proposed a hypothesis for the catalyst-regulated ring expansion and cyclization process. Compared to their linear counterparts, these cyclic polymers exhibit higher onset decomposition temperature, narrower degradation window, and maintain high chemical recyclability.
Article
Polymer Science
Chao Chen, Yves Gnanou, Xiaoshuang Feng
Summary: In this study, a series of bifunctional borinane-based catalysts were successfully designed and synthesized for efficient ring-opening polymerization of epoxides under mild conditions, resulting in high molar mass polyethers. These catalysts showed high productivity even at low loading amounts, as low as 50 ppb, when used with chain transfer agents. Additionally, they demonstrated record turnover frequency (TOF) values and molar masses for the polymerization of oxetane.
Article
Polymer Science
Kana Takebayashi, Arihiro Kanazawa, Sadahito Aoshima
Summary: The cationic ring-opening copolymerization of cyclic acetals and 1,3-dioxolan-4-ones (DOLOs) was investigated, with a focus on understanding the polymerization mechanisms. The copolymerization of 1,3-dioxepane and 5-methyl-1,3-dioxolan-4-one successfully occurred using CF3SO3H as a catalyst, resulting in high molecular weight copolymers. NMR spectrometry and electrospray ionization mass spectrometry were used to analyze the detailed structure of the copolymers, which indicated that the copolymerization proceeds through an activated monomer mechanism involving the reaction of a hydroxy group and a proton-attached DOLO. Acid-catalyzed transacetalization reactions also likely occurred during the copolymerization process.
Article
Polymer Science
Dorothee Silbernagl, Heinz Sturm, Alex J. Plajer
Summary: In this study, we introduce a novel sequence selective terpolymerisation method that allows three specific monomers to be selectively enchained into a desired sequence. This technique can be used to generate tetrapolymers by coupling with other reactions such as CS2 ROTERP, and can also be employed in switchable catalysis for blockpolymer synthesis when combined with epsilon DL ROP.
Review
Polymer Science
Geetanjali Shukla, Robert C. Ferrier
Summary: PECH is a functional polyether synthesized by the ring opening polymerization of ECH, its inexpensive precursor, in the 1950's. ECH is an ideal feedstock for polymer materials due to its functional, inexpensive, and environmentally friendly production, but polymerizations involving ECH are difficult due to the alkyl chloride pendant.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
Zhao Zheng, Lu Liu, Mu Li, Weigang Sun, Yuling Liang, Jiadong Chen, Junsheng Yang, Rongchun Zhang, Panchao Yin
Summary: Through the manipulation of surface charges and loadings, 1 nm super-acidic metal oxide clusters can co-crystallize with poly(ethylene glycol) (PEG) at the molecular scale to produce thermoplastic anhydrous proton exchange membranes (PEMs). The coexistence of crystalline and amorphous regions provides the PEMs with high Young's modulus and flexibility, while the noncovalent complex interactions enable easy preparation and reprocessing. The diffusion dynamics of PEG chains are slowed down by the confinement effect, while the local segmental dynamics are accelerated, facilitating proton transport and achieving excellent anhydrous proton conductivity.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Polymer Science
Xue Liang, Wenli Wang, Dan Zhao, Hengxu Liu, Yunqing Zhu
Summary: This study presents a simple and cost-effective binary catalytic system for producing block copolymers with diverse structures by switching between epoxides, cyclic anhydrides, and cyclic esters. The successful formation of precise triblock copolymer structures has been confirmed through experimental analysis.
Article
Polymer Science
Xue Liang, Wenli Wang, Dan Zhao, Hengxu Liu, Yunqing Zhu
Summary: Self-switchable polymerization is a versatile and convenient synthetic approach for producing block copolymers. Metal-free organocatalysts have shown great potential in this field, and TU/PPNCl is a simple and cost-effective catalytic system that can switch between different monomers and produce sequence-controlled multiblock polyesters with diverse structures. This offers opportunities for synthesizing diverse and functional multiblock copolymer materials.
Article
Chemistry, Multidisciplinary
Susanne Rupf, Patrick Proehm, Alex J. Plajer
Summary: Heteroatom-containing degradable polymers have strong potential as sustainable replacements for petrochemically derived materials. To accelerate and broaden their uptake, greater structural diversity and new synthetic methodologies are required. This study reports a sequence selective ring-opening terpolymerisation (ROTERP), which selectively enchains three monomers into a specific sequence using a simple lithium catalyst. The obtained degradable poly(ester-alt-ester-alt-trithiocarbonate)s have a molecular weight range from 2.35 to 111.20 kDa, which are not easily accessible via other polymerisation methodologies. The ROTERP demonstrated in this study could be the first example of an entirely new family of sequence selective terpolymerisations.
Article
Chemistry, Multidisciplinary
Lanxin Long, Samara Medina Rivero, Fanxi Sun, Dongsheng Wang, Dimitri Chekulaev, Claire Tonnele, David Casanova, Juan Casado, Yonghao Zheng
Summary: A combined experimental and theoretical study was conducted to elucidate the polymerization mechanism of a bisindenedione compound in the solid state. The study revealed the reaction pathway, starting from the formation of a triplet excimer state to an intermolecularly bonded triplet state that initiates the polymerization. Various spectroscopic techniques and quantum chemical calculations were employed to analyze the process. The presented mechanistic insight is valuable for understanding the complexity of this important reaction and for predicting and diversifying the resulting products.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Ying Wang, Yanni Xia, Zhengjiang Hua, Chengjian Zhang, Xinghong Zhang
Summary: This work presents the copolymerization of propylene carbonate with carbonyl sulfide to prepare poly(thioether)s, which provides a new approach for the application of cyclic carbonates and the synthesis of thioether-based polymers.
Article
Chemistry, Multidisciplinary
Fuqiang Fan, Zhihui Zhang, Qingqi Zeng, Liying Zhang, Xuemin Zhang, Tieqiang Wang, Yu Fu
Summary: The self-assembly of MOFs is crucial for the functional design of materials, but oriented self-assembly is still a challenge. This study proposes a novel strategy to drive oriented self-assembly of MOF polyhedral particles at the water-liquid interface by photoinitiated monomer polymerization. The prepared MOF polymer films show a Janus structure and can be easily transferred to various substrates.
Review
Chemistry, Multidisciplinary
Cansu Aydogan, Gorkem Yilmaz, Ataulla Shegiwal, David M. Haddleton, Yusuf Yagci
Summary: The application of photochemistry in polymer synthesis offers unique advantages compared to thermochemistry, allowing for precise control over macromolecular structure and chain length while also being environmentally friendly. Recent research has focused on utilizing photocontrolled living radical and cationic polymerizations for polymer synthesis.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Zeynep Deliballi, Rezan Demir-Cakan, Baris Kiskan, Yusuf Yagci
Summary: A new approach to vulcanize commercial PVC at room temperature using elemental sulfur and an initiator is reported. The obtained crosslinked polymer with polysulfide linkages shows potential for recycling/self-healing and as cathode material for Li-S battery.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
Huseyin Cem Kiliclar, Emirhan Gencosman, Yusuf Yagci
Summary: This study presents a novel visible light induced step-growth polymerization mechanism and demonstrates the potential for grafting onto polymers containing epoxide at their side chains. By changing the molar ratios of the monomers, higher molecular weight polymers can be obtained, showing the effectiveness of the chain-growth condensation polymerization mechanism.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Polymer Science
Bahar T. Ercan, Sirin S. Gultekin, Tamer Yesil, Haluk Dincalp, Sermet Koyuncu, Yusuf Yagci, Ceylan Zafer
Summary: This study reports the photoinitiated cationic polymerization of epoxy resins using four new chromophoric dyes and diphenyliodonium hexafluorophosphate under sunlight. It is shown that ISOVIII and TPDC6, which have carbazole groups, exhibited higher initiation efficiency.
POLYMER INTERNATIONAL
(2022)
Article
Polymer Science
Cansu Aydogan, F. Simal Aykac, Gorkem Yilmaz, Ye Qiu Chew, Atsushi Goto, Yusuf Yagci
Summary: A versatile strategy for the fabrication of block copolymers using a combination of two discrete living polymerization techniques has been reported. The strategy involves reversible complexation mediated living radical polymerization (RCMP) and photoinduced radical oxidation addition deactivation (PROAD) processes. The formation of the block copolymers was confirmed through various characterization techniques.
Article
Polymer Science
Cansin Birsen Buldum, Sevinc Gulyuz, Yusuf Yagci, Baris Kiskan
Summary: Siloxane bearing benzoxazines derived from renewable phenolics such as vanillin and coumarin have been prepared and reacted with glycerol to form processable, soft, and curable bio-hybrid gels. The presence of hydroxyl groups on glycerol moieties facilitates curing, resulting in bio-hybrid polybenzoxazines at temperatures below 200°C.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Merve Danisman, Avni Berisha, Omar Dagdag, Ayhan Oral
Summary: Surface modification of particles using enzymes instead of chemicals can avoid limitations and energy loss, and is widely applied in various fields.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Composites
Seda Bekin Acar, Kevser Ozdemir, Mustapha Raihane, Mohammed Lahcini, Mehmet Atilla Tasdelen
Summary: In this study, naturally occurring halloysite nanotube (HNT) was modified by vinyltriethoxysilane and used as nanofiller in the preparation of HNT/thermoset nanocomposites via free radical photocrosslinking polymerization. The presence and covalent bonding of HNT nanofiller in the thermoset matrix were confirmed by Fourier transform infrared spectroscopy. The thermal properties and dispersion of nanofillers in the nanocomposites were analyzed by thermogravimetric analysis and electron microscopy techniques. The addition of HNT-Vinyl improved the mechanical properties of the nanocomposites, especially the tensile strength.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Ozlem Albayrak Hacioglu, Mehmet Atilla Tasdelen
Summary: The synergistic effect of organically modified sepiolite nanoclay (SP) in conjunction with aluminum polyphosphate/pentaerythritol as an intumescent flame retardant (IFR) additive on the polyolefin elastomer/linear low-density polyethylene compound has been studied. The addition of SP nanoclay slightly improved the LOI values and thermal properties of the compounds, while reducing the burning rate and improving the flammability parameters.
IRANIAN POLYMER JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Zehra Gul Coban, Huseyin Cem Kiliclar, Yusuf Yagci
Summary: Photochemical techniques have seen a revival due to their adaptability and ability to produce complex macromolecular structures, although their application in the polymerization of cyclic siloxane monomers has been limited. This study investigated the cationic ring-opening polymerization of Octamethylcyclotetrasiloxane (D4) using diphenyl iodonium hexafluorophosphate (DPI) as the initiator. Both direct and indirect initiation systems were examined, using benzophenone and pyrene to generate photochemically induced protonic acids and silylium cations for the polymerization. Kinetics of the polymerization were monitored using viscosimetry and GPC analysis. This approach has potential industrial importance for polysiloxane fabrication due to its ability to overcome challenges associated with conventional methods.
Article
Polymer Science
Cengiz Caner, Fatih Rahvali, Muhammed Yuceer, Ayhan Oral
Summary: This research investigated the effects of different types and concentrations of Cloisite on the properties of chitosan films. Cloisite significantly decreased the lightness (L*) depending on the type and concentration. Films containing Cloisite showed improved oxygen barrier properties by 34.5%-73.6% and water barrier properties by up to 84.61%. The dispersed Cloisite clays enhanced the thermal stability, barrier properties, and tensile properties of chitosan.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Gurkan Alkan, Seyhan Ulusoy, Mert Akgun, Ayhan Oral
Summary: In recent years, nanofibers loaded with pharmaceutical agents have become increasingly important in various medical applications due to their advantages. This study successfully loaded polylactic acid (PLA)-gelatin (Gel) nanofibers with Ibuprofen-Na/Paracetamol. The nanofibers were characterized and their antibacterial and antibiofilm activities were evaluated. The results showed that the nanofibers exhibited antibacterial activity and were promising materials for wound healing applications.
MACEDONIAN JOURNAL OF CHEMISTRY AND CHEMICAL ENGINEERING
(2023)
Article
Polymer Science
Tuba Gungor Ertugral, Merve Danisman, Ayhan Oral
Summary: Cold storage is a healthy method of preserving food, but it often relies on expensive and non-environmentally friendly fossil fuel-based materials. This study explores the use of microcapsules with heat storage and diffusion properties in packaging materials to minimize the use of fossil fuels. The results show that these microcapsules can effectively maintain the desired storage temperature range for sensitive food products.
POLYMER-PLASTICS TECHNOLOGY AND MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Serhat Oran, Hatice Aylin Karahan Toprakci, Ozan Toprakci, Mehmet Atilla Tasdelen
Summary: In this study, MWCNT/ABS nanocomposite filaments were prepared using extrusion and printing techniques, and their morphological, electrical, and mechanical properties were characterized. The results showed that the samples exhibited good resistivity and elastic modulus at specific temperature and nanofiller concentration, while elongation at break and impact strength decreased. Additionally, the presence of MWCNT also altered the morphology of the samples.
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
(2022)
Article
Polymer Science
Sevinc Gulyuz, Yusuf Yagci, Baris Kiskan
Summary: A new strategy for the synthesis of self-healable/recyclable polybenzoxazine networks by exploiting dynamic B-O bond exchanges is presented in this work. The obtained films exhibit good self-healing properties and hydrolysis stability under mild conditions.
