Article
Polymer Science
Jingfang Li, Hongwei Lu, Hao Zheng, Xianju Zhou, Jun Nie, Xiaoqun Zhu
Summary: By isomerizing E,Z-BPC back to E,E-BPC through heating, a thermally activated system for free radical photopolymerization was developed. The intra-molecular hydrogen bonding of N-H center dot center dot center dot O=C in E,Z-BPC also contributes to its stability at room temperature under sunlight irradiation in presence of TEOA.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Rui Yang, Yuting Wang, Boran Hao, Kan Zhang
Summary: Two novel benzoxazine monomers, oHMTI-a and oHMTI-pn, were obtained via modified Mannich condensation, with oHMTI-pn showing unique polymerization characteristics at lower temperatures. The resulting polybenzoxazines derived from oHMTI-pn exhibited high thermal stability and excellent flame retardancy, highlighting the potential for practical applications in the future.
HIGH PERFORMANCE POLYMERS
(2021)
Article
Polymer Science
Rebeca Leu Alexa, Horia Iovu, Jana Ghitman, Andrada Serafim, Cristina Stavarache, Maria-Minodora Marin, Raluca Ianchis
Summary: The focus of this study was on developing suitable GelMA hydrogel inks for 3D printing in tissue engineering applications. By exploring different degrees of GelMA methacrylation, concentrations of GelMA, and concentrations of photoinitiator, the researchers were able to determine the optimal formulations for the printing process. The presence of methacryloyl groups, the isoelectric point, hydrophilicity, mechanical properties, and structural integrity of the GelMA-based inks and 3D-printed scaffolds were thoroughly characterized to ensure their suitability for biological applications.
Article
Chemistry, Multidisciplinary
Wei Church Poh, Alice Lee-Sie Eh, Wenting Wu, Xiaoyu Guo, Pooi See Lee
Summary: Formation of ionogels through in situ polymerization improves electrolyte processability. Two in situ polymerized ionogels are developed, which can be rapidly photocured and exhibit excellent physicochemical stability. The electrochromic devices assembled using these ionogels show high color contrast, fast response time, and excellent cycling endurance. Additionally, these devices can be operated over a wide temperature range. The technology also enables the realization of flexible and curved electrochromic devices, highlighting their potential use in futuristic wearables.
ADVANCED MATERIALS
(2022)
Article
Polymer Science
Buesra Akkaya, Ferhat Sen
Summary: This study aimed to synthesize and characterize UV and thermally curable polybenzoxazine/silica nanocomposites as high performance coating materials. The nanocomposite films with superior thermal and mechanical properties were produced by synthesizing and characterizing benzoxazine monomers and silica nanoparticles.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Polymer Science
Alamelu Suriya Subramanian, Xiao 'Matthew' Hu
Summary: The photosensitivity of nanoparticulate polydopamine and polydopamine coated multiwalled carbon nanotubes was investigated in relation to the photopolymerization of epoxy monomers. It was found that the inclusion of PDA/MWCNT nanohybrid significantly increased the polymerization speed and conversion. Furthermore, the covalent coated PDA/MWCNT nanohybrids acted as both photosensitizer/co-initiator and mechanical reinforcement for the epoxy matrix. This hybridized sensitizers/co-initiators have the potential to be applied in UV-blocking additive-dependent VAT-type 3D printing technologies.
Article
Polymer Science
I Zaborniak, P. Chmielarz
Summary: Radical polymerization techniques utilizing naturally occurring substances, such as riboflavin, are being rapidly developed towards more sustainable and environmentally friendly approaches. Riboflavin's unique structure and biological activity make it an excellent target for radical polymerization, with its versatile properties that allow for easy modification to incorporate additional functional groups. Recent advances in utilizing riboflavin structure to mediate free radical polymerization and controlled polymerization techniques offer environmentally friendly and easily scalable methods for the preparation of functional polymer materials with diverse applications.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Polymer Science
Andrea Nitti, Angelo Martinelli, Fabrice Batteux, Stefano Protti, Maurizio Fagnoni, Dario Pasini
Summary: In this study, the polymerization of electron-poor olefins was successfully achieved under free-radical conditions using arylazo sulfones as visible light photoinitiators. The process proceeded smoothly at room temperature without the need for any co-initiators or additives, resulting in high molecular weight polymers obtained in excellent yields.
Article
Biotechnology & Applied Microbiology
Dilruba Baykara, Tuba Bedir, Elif Ilhan, Mehmet Eren Mutlu, Oguzhan Gunduz, Roger Narayan, Cem Bulent Ustundag
Summary: Microneedles (MNs) are micrometer-sized arrays that can penetrate the skin in a minimally invasive manner. In this study, 3D printed GelMA MNs with desired geometries were fabricated using the vat photopolymerization technique. The effects of varying needle heights and exposure times on the GelMA MNs were examined, and it was found that longer exposure times resulted in higher MNs with sharper tips. GelMA MNs also demonstrated good mechanical performance. These findings suggest that 3D printed GelMA MNs have great potential for transdermal drug delivery.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Samuel N. Sanders, Tracy H. Schloemer, Mahesh K. Gangishetty, Daniel Anderson, Michael Seitz, Arynn O. Gallegos, R. Christopher Stokes, Daniel N. Congreve
Summary: This study presents a method of volumetric printing using triplet fusion upconversion at low power excitation, overcoming the limitations of nanoscale applications. The introduction of an excitonic strategy allows for the control of the upconversion threshold, supporting different printing schemes.
Article
Chemistry, Applied
Weichen Sheng, Ren Yin, Jianfeng Chen, Kan Zhang
Summary: Novel 1,3-benzoxazine monomers with ortho-imide and benzocyclobutene functionalities were synthesized and their chemical structures and polymerization behaviors were studied. Multiple polymerization mechanisms were proposed for these monomers, and the resulting thermosets showed excellent thermal stability and flame retardancy.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Polymer Science
Narmin Suvarli, Iris Perner-Nochta, Juergen Hubbuch, Michael Woerner
Summary: Spherical polymer nanoparticles with functional -SH groups were successfully synthesized via aerosol photopolymerization using radically initiated thiol-ene chemistry. The nanoparticles were shown to be spherical and individual when higher monomer functionalities and equal overall stoichiometry of functional groups were used, with potential for post-polymerization modifications.
Article
Polymer Science
Yuqi Liu, Li Yuan, Guozheng Liang, Aijuan Gu
Summary: A new bifunctional benzoxazine monomer (ST-fa) with outstanding thermal resistance and high tensile properties was synthesized using green solvents. The cured resin derived from ST-fa showed excellent comprehensive performance due to the high crosslinking density and rigidity formed in the curing process.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Multidisciplinary Sciences
Sina Sharifi, Hannah Sharifi, Ali Akbari, James Chodosh
Summary: This study systematically optimized the crosslinking conditions of GelMA hydrogel by independently varying the concentrations of EosinY, triethanolamine, vinyl caprolactam, GelMA precursor, and crosslinking times, and evaluating their effects on the properties of the hydrogel. The results showed that except for EosinY, increasing the concentrations of other parameters improved the mechanical, adhesion, swelling, and biodegradation properties of the hydrogel but reduced cell viability in 3D cell culture.
SCIENTIFIC REPORTS
(2021)
Article
Polymer Science
Fusun Seyma Gungor
Summary: A compound with a phenolic group was successfully synthesized and subjected to Mannich reactions with primary amine compounds and paraformaldehyde, resulting in three thermally polymerizable naphthoxazines with high yields. The structures of the exchange products were characterized using analytical techniques and the ring-opening polymerization behavior was investigated.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Azra Kocaarslan, Zafer Eroglu, Gorkem Yilmaz, Onder Metin, Yusuf Yagci
Summary: This study utilizes few-layer black phosphorus as a photocatalyst to initiate polymerization of various monomers under visible and near-IR light irradiation, with aryldiazonium salt identified as the most efficient photopolymerization catalyst. This strategy also enables the in situ preparation of BP-polymer composite materials.
Article
Chemistry, Multidisciplinary
Yi Zhu, Dandan Xu, Yuchao Zhang, Yufan Zhou, Yusuf Yagci, Ren Liu
Summary: The novel photoinitiator P-PTh possesses broad wavelength absorption capabilities in the UV, visible, and near-IR regions, allowing it to efficiently initiate polymerization reactions at different wavelengths. This flexibility may lead to novel pathways in curing applications for pigment systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Organic
Azra Kocaarslan, Zafer Eroglu, Onder Metin, Yusuf Yagci
Summary: In this study, a novel synthetic methodology for the photoinduced CuAAC reaction utilizing exfoliated two-dimensional black phosphorus nanosheets as photocatalysts under white LED and near-IR light irradiation was presented. The ability to initiate CuAAC reactions by BPNs was successfully demonstrated, leading to the synthesis of different macromolecular structures such as functional polymers, cross-linked networks, and block copolymers.
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
(2021)
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
Mehmet Bilgehan Bilgic, Kerem Kaya, Nermin Orakdogen, Yusuf Yagci
Summary: Hydrogels, with high water absorption, biocompatibility, and non-toxic characteristics, are important polymers for various technologies. In this study, a facile synthesis of clickable polyacrylamide hydrogel was reported using photopolymerization. The gel's properties were affected by the irradiation time.
EUROPEAN POLYMER JOURNAL
(2022)
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
Chemistry, Multidisciplinary
Azra Kocaarslan, Kerem Kaya, Steffen Jockusch, Yusuf Yagci
Summary: In this study, a single component near UV-responsive photopolymerization system using phenacyl bromide (PAB) is reported for step-growth polymerization of N-methylpyrrole (MPyr) and N-methylindole (MIn). The polymerization process proceeds through photoinduced cleavage of PAB, followed by electron transfer, proton release, and coupling processes. Chain growth continues even after photolysis in daylight or dark.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
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
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
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.
Article
Polymer Science
Zeynep Deliballi, Baris Kiskan, Yusuf Yagci
Summary: Photo-induced cationic ring opening reactions were successfully performed on main chain polybenzoxazine precursors using iodonium salts, resulting in gelation of the precursors in a relatively short time. The obtained gels contained unreacted oxazines and were thermally cured at lower temperatures, showing a dual curable character. Additionally, sensitizers such as thioxanthone and camphorquinone extended the photocuring wavelength to higher wavelengths.
