Article
Polymer Science
Qian Chen, Dayong Ren, Weichen Sheng, Kan Zhang
Summary: Two novel bio-based benzoxazine monomers containing imide or amide groups were synthesized and their structures were characterized. The results showed that these resins have high curing temperatures and excellent thermal stability, suggesting their potential for high-tech applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Boran Hao, Yuqi Liu, Xinye Yu, Kan Zhang
Summary: In this study, a benzoxazine monomer with ortho-maleimide functionality was successfully synthesized and characterized. The polymerization behavior and thermal properties of this monomer were investigated, showing its great potential for high-performance applications. The calculated kinetic parameters suggest its excellent thermal stability in the resulting polybenzoxazine.
MACROMOLECULAR RESEARCH
(2021)
Article
Materials Science, Characterization & Testing
Xiaoqian Xu, Mingzhen Xu, Tian Liu, Dengxun Ren, Xiaobo Liu
Summary: A promoted polymerization method for a phthalonitrile-based polymer was designed and its curing processes and behaviors were investigated. The results showed that this method could reduce the prepolymerization temperature, increase the polymerization rate and crosslinking degree, and form specific aromatic heterocyclic structures. The polymer exhibited outstanding thermal and mechanical properties.
Article
Nanoscience & Nanotechnology
Xinglong Kang, Zhehong Lu, Weili Feng, Junliang Wang, Xiaomin Fang, Yuanqing Xu, Yanpeng Wang, Baoying Liu, Tao Ding, Yong Ma, Duo Pan, Rahul Rangrao Patil, Vignesh Murugadoss
Summary: The synergist of phosphorus and silicon-containing benzoxazine (p-BOZ) improved the flame retardancy of polyoxymethylene (POM) by enhancing the char formation ability of the APP/ME system, while reducing smoke generation. The introduction of p-BOZ resulted in POM composites achieving UL94 V-0 rating and a high LOI value, demonstrating its effectiveness as a flame retardant synergist and smoke suppressant.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Polymer Science
Wenjing Kong, Jiaqi Sun, Muyao Gao, Tianhao Li, Ming Liu, Yujie Song
Summary: In this article, boron element was incorporated into phthalonitrile resins to improve their processibility and thermal stability. The modified resins showed lower melting points and better thermal stability, with stable mechanical properties over a wide temperature range, which is crucial in harsh environments.
Article
Polymer Science
Manlin Yuan, Xin Lu, Yudi Zhao, Shiao-Wei Kuo, Zhong Xin
Summary: In this paper, two novel siloxane-containing benzoxazine monomers, P-aptmds and P-appdms, were successfully synthesized. P-appdms exhibited excellent thermal stability and lower surface free energy and water absorption compared to P-aptmds. Both P-aptmds and P-appdms showed good dielectric properties due to the presence of bulky tert-butyl groups and non-polar siloxane segments.
Article
Polymer Science
Dengxun Ren, Mingzhen Xu, Sijing Chen, Xiaoqian Xu, Shuai Zhang, Mangui Han, Xiaobo Liu
Summary: Introduction of fluorinated substituents in molecular chains is an efficient method to prepare materials with decreased dielectric constant and loss, as demonstrated in the synthesis of a kind of fluorinated phthalonitrile containing benzoxazine. The cured BPAF-ph showed double-stage curing reaction behaviors and good processability, with structures and properties being influenced by different post curing procedures. The glass fiber reinforced BPAF-ph composites exhibited promising properties in terms of thermal and mechanical stability.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Polymer Science
Kamer Bayram, Baris Kiskan, Yusuf Yagci
Summary: Benzoxazines with thioamide linkages were successfully prepared through a specific synthetic route, further converted into polybenzoxazines. The curing behavior and thermal stability were studied, revealing that thioamide groups can reduce curing temperatures and possibly generate thiols during heating.
Article
Polymer Science
Jing Zhao, Jipeng Chen, Xiaoxiao Zheng, Qi Lin, Guocai Zheng, Yanlian Xu, Fengcai Lin
Summary: In this study, a high-performance coating with low environmental impact was synthesized using urushiol-based benzoxazine containing tertiary amines as the precursor, and a sulfobetaine moiety into the benzoxazine group was introduced. This sulfobetaine-functionalized urushiol-based polybenzoxazine coating (poly(U-ea/sb)) was capable of killing marine biofouling bacteria and resisting protein attachment. The coating exhibited high antibacterial and algal inhibition activity and effectively prevented microbial adherence. This dual-functional crosslinkable zwitterionic polymer provides new ideas for the development of green marine antifouling coating materials.
Article
Chemistry, Multidisciplinary
Sreejith Sudhakaran Jayabhavan, Jonathan W. Steed, Krishna K. Damodaran
Summary: A series of bis(urea) compounds with complementary functional groups similar to the drug metronidazole and its structural isomer have been synthesized and studied for their gelation properties. It was found that drug-mimetic gels interact with the surface of the drug crystal, resulting in new crystal morphologies, while nonmimetic gels did not show this effect.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Polymer Science
Nianjun Kang, Shuai Yang, Xuhai Xiong, Anchang Han, Rong Ren, Jing Wang
Summary: In this study, alkyne-functionalized benzoxazine resins with phthalide side groups and cyano groups were produced to overcome the limitations of traditional benzoxazine resins in high-temperature settings and toughness. The resin structure was characterized using FT-IR and 1H-NMR, and the thermal curing kinetics were investigated using DSC. The gelation time of the resin at various temperatures was evaluated using DMA, and the results showed that the resin system has high glass transition temperature and high-temperature resistance, making it suitable for applications requiring high temperature and toughness.
Article
Polymer Science
Lin Xie, Rui Yang, Nan Li, Pablo Froimowicz, Kan Zhang
Summary: In this study, two novel triptycene-based dioxazine benzoxazine monomers were synthesized and a thermoresponsive benzoxazine copolymer was successfully prepared. The resulting materials exhibited outstanding thermal stability and flame retardant properties, suggesting their potential application in advanced materials design.
Article
Biochemistry & Molecular Biology
Huili Yang, Yanqin Du, Guangshe Zhang, Ling Han, Longgui Zhang, Riwei Xu
Summary: In this study, a bio-based raw material, erythritol, was used to introduce an acetal structure into benzoxazine resins, resulting in environmentally friendly thermosetting resins. The synthesized polybenzoxazine resins showed good thermal-oxidative aging, wet-heat resistance, and complete degradation in an acidic solution.
Article
Multidisciplinary Sciences
Gautier Bailleul, Guang Yang, Callum R. R. Nicoll, Andrea Mattevi, Marco W. W. Fraaije, Maria Laura Mascotti
Summary: Enzyme functional diversification is crucial for biological adaptation, allowing organisms to utilize or eliminate new substances and xenobiotics in new environments. This study uses a paleobiochemistry approach and enzymology techniques to uncover the historical substitutions that led to the functional diversification of the FMO family in tetrapods. Few amino acid replacements modulate the oxygenating flavin intermediate, transforming an ancestral multi-tasking FMO into a specialized monooxygenase. This finding highlights the importance of residues beyond the active site core in determining enzymatic function. Detoxification enzymes play a crucial role in the survival of animals in new environments.
NATURE COMMUNICATIONS
(2023)
Review
Virology
Kinga K. Nagy, Mikael Skurnik, Beata G. Vertessy
Summary: The presence of uracil in DNA can have adverse effects on organisms, leading them to develop various pathways to counteract uracil, with some bacteriophages having thymine-lacking uracil-DNA genomes. Studying how these bacteriophages replicate in bacteria with efficient repair pathways may reveal new inhibitors for biotechnological applications.
Article
Polymer Science
Paige A. Shaw, Maxime Klausen, Mark Bradley
Summary: A light-responsive polymer capable of controlled release of camptothecin and generation of reactive oxygen species (ROS) was developed, which exhibited high cancer cell killing activity through both camptothecin release and ROS generation.
Article
Polymer Science
Donghui Zhang, Shiqi Liu, Zhihao Cai, Weizhe Luo, Guojian Liu, Runhui Liu
Summary: A straightforward and efficient method for synthesizing NPC monomers has been developed in this study, which enhances the availability of NPC monomers and facilitates the synthesis of polypeptides.
