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Manipulating the antioxidative capacity of melanin-like nanoparticles by involving condensation polymerization

Science China Chemistry 2023年第5期66卷 1520-1528页

作者： Peng Yang Tianyou Wang Jianhua Zhang Hengjie Zhang Wanjie Bai Gaigai Duan Wei Zhang Jinrong Wu Zhipeng Gu Yiwen Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Laboratory for Biomaterials and Drug Delivery Department of AnesthesiologyCritical Care and Pain MedicineBoston Children’s HospitalHarvard Medical SchoolBostonMassachusetts 02115USA

Melanin is ubiquitous in nature and plays important roles in physiological activities especially in keeping the oxidative *** natural and synthetic melanin were synthesized via the free radical polymerization of 5,6-dihydroxyindole(DHI)monomer,which may lead to the inherent compactπ-conjugation stacking microstructures and finally results in limited antioxidative *** address this issue,we have strived to involve condensation polymerization during the melanin synthetic process,aiming to disrupt the compact stacking microstructures and improve the total antioxidative *** resulting melaninlike nanoparticles(NPs)indeed possessed less compact stackingπ-conjugation structures and decreased density,which further demonstrated enhanced antioxidative abilities compared with conventional melanin-like polymers such as poly-5,6-dihydroxyindole(Poly-DHI)and polydopamine(PDA).Their excellent free radical scavenging capability was further confirmed by the intracellular cell protection effects against reactive oxygen species(ROS)as well as in vivo therapy for acute diseases including acute kidney injury and acute liver *** work would promote future work toward new types of melanin-inspired nanomaterials with tunable and improved functions beyond nature.

关键词： melanin condensation polymerization free radical polymerization polydopamine antioxidative-therapy

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CROSSLINKED ORGANOSILOXANE HYBRID MATERIALS PREPARED BY condensation OF SILANOL AND MODIFIED SILICA: SYNTHESIS AND CHARACTERIZATION

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Chinese Journal of Polymer Science 2013年第7期31卷 974-983页

作者： Da-hai Gao 贾梦秋 Ying Luo College of Materials Science and Engineering Beijing University of Chemical Technology Nuclear Power Institute of China

Hybrid materials based on polymethylphenylsiloxane （PMPS） and organic functionalized silica were synthesized via condensation reaction between silanol and alkoxysilyl groups in the presence of quaternary ammonium hydroxide. The structure of prepared materials was investigated by FTIR and NMR, which indicate that the products have incorporated modified silica into the polymer matrix. The prepared hybrid materials show a satisfactory thermal resistance because the initial decomposition of typical product occurred at nearly 100 K higher than that of the pure polymer according to the thermogravimetric analysis （TGA） results. Differential thermogravimetric analysis （DTGA） data confirm that the thermal degradation of prepared hybrid materials comprises of two steps, of which the first one could be controlled by adjusting the content of silica particles and the ratio of surface groups on the particles. The coating films obtained from hybrid products exhibit good thermal mechanical properties. Therefore, the materials are hoped to be used for the application in thermal resistant coating.

关键词： Hybrid material Crosslinked polysiloxane condensation polymerization Thermal stability.

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SYNTHESIS AND CHARACTERIZATION OF NOVEL OPTICALLY ACTIVE POLY(AMIDE-IMIDE)S AND POLY(ESTER-IMIDE)S CONTAINING CALIX[4]ARENE AND AMINO ACID UNITS WITH BINDING ABILITY TOWARDS ALKALI METAL AND TOXIC HEAVY METAL CATIONS

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Chinese Journal of Polymer Science 2010年第5期28卷 731-743页

作者： Abdol-reza Hajipour Sakineh Habibi Arnold E.Ruoho Dept.of Pharmacology University of WisconsinMedical SchoolMadison53706-1532WIUSA Pharmaceutical Research Laboratory College of ChemistryIsfahan University of TechnologyIsfahan 84156IR Iran

A novel calix[4]arene derivative 2 with amino functional groups at the lower rim was first prepared via introduction of nitro functional groups and amination of the dinitro derivative of calix[4]arene. The optically active monomers were synthesized by dehydration of L-leucine （and L-isoleucine） and 3,3＇,4,4＇-benzophenonetetracarboxylic- 3,3＇,4,4＇-dianhydride （3） followed by reaction with thionyl chloride to form 5a and 5b. Two methods, polymerization under microwave irradiation and solution polymerization in CH2Cl2/TEA, were then employed to carry out the condensation polymerization of 2 with the optically active monomers 5a and 5b, respectively. The polymerization conditions affected the kind of resulting polymers, poly（amide-imide）s （PAIs） 6a and 6b and poly（ester-imide）s （PEIs） 6a＇ and 6b＇ were obtained selectively in good yields and moderate inherent viscosities. Sorption-extraction experiments were carried out using cram picrate extraction method and verified good binding ability of the resulting calixarene-based polymers towards silver, alkali metal and toxic heavy metal cations. Also thermogravimetric analysis indicated that the resulting PAIs and PEIs were thermally stable.

关键词： condensation polymerization Ionophores Optically active Toxic heavy metals Polymeric calixarenes Thermal stability.

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