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Sequence‐Controlled polymers with Furan‐Protected Maleimide as a Latent Monomer

Angewandte Chemie 2017年第9期129卷

作者： Yuxuan Ji Liuqiao Zhang Xue Gu Wei Zhang Nianchen Zhou Zhengbiao Zhang Xiulin Zhu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China

Herein, a novel methodology for preparing sequence‐controlled polymers is illustrated by using a latent monomer, furan protected maleimide (FMI). At 110 °C, FMI is deprotected by retro Diels–Alder (rDA) reaction, and the released MI is immediately involved in the cross‐polymerization with styrene (St) to deliver heterosegments. At 40 °C the rDA reaction does not proceed, therefore homo‐poly(styrene) segments are produced. By implementing programmable temperature changes during polymerization of St and FMI, “living” polymers with tailored a sequence are created. A ternary copolymerization produces complex sequences as designed. Alkynyl‐functionalized FMI, used as a latent monomer, leads to the desirable placement of functional groups along the polymer chain. This latent‐monomer‐based strategy opens a new avenue for fabricating sequence‐controlled polymers.

关键词： Cycloadditionen polymerisationen Radikale Reaktionskinetik Synthesemethoden

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SYNTHESIS AND PROPERTIES OF COMBLIKE-LINEAR BLOCK COpolymerS WITH ALTERNATING GRAFTS

SYNTHESIS AND PROPERTIES OF COMBLIKE-LINEAR BLOCK COPOLYMERS...

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第七届高分子化学国际学术研讨会

作者： Youliang Zhao Min Tong Dandan Tang Xiao Jiang Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials College of Chemistry Chemical Engineering and Materials Science Soochow University

Well-defined architecture plays a crucial role in polymer materials,in which precise microstructure can endow materials with novel physicochemical properties,and the function integration can allow multipurpose *** various topological polymers,graft polymers and their derivatives have attracted much attention due to their special architecture and versatile functions. To further reveal

关键词： SYNTHESIS AND PROPERTIES OF COMBLIKE-LINEAR BLOCK COpolymerS WITH ALTERNATING GRAFTS

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Synthesis and Properties of Monocleavable Stimuli-sensitive ABCD-Type Miktoarm Star Quaterpolymers

Synthesis and Properties of Monocleavable Stimuli-sensitive ...

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第一届聚合物分子工程国际学术会议

作者： Youliang Zhao Huanhuan Liu Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsCollege of ChemistryChemical Engineering and Materials ScienceSoochow University

Synthesis and properties of complex topological polymers have been an enduring topic in current polymer science.1,2 The latest advance in living/controlled polymerization techniques and highly efficient linking reactions enables precise synthesis of various types of functional *** them,multicomponent miktoarm star copolymer(MMS)with at

关键词： Synthesis and Properties of Monocleavable Stimuli-sensitive ABCD-Type Miktoarm Star Quaterpolymers MMS

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MULTICOMPARTMENT MORPHOLOGIES SELF-ASSEMBLED FROM FLUORINATED ABC TRIBLOCK TERpolymerS:EFFECTS OF FLEXIBLE AND RIGID HYDROPHOBIC MOIETIES

MULTICOMPARTMENT MORPHOLOGIES SELF-ASSEMBLED FROM FLUORINATE...

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第七届国际高分子化学学术研讨会

作者： Jinlin He Sen Li Mingzu Zhang Hairong Wang Peihong Ni College of Chemistry Chemical Engineering and Materials ScienceState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisJiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSoochow University

Multicompartment micelles self-assembled by a wide variety of synthetic macromolecules, which may be linear multiblock terpolymers,multiarmed or miktoarm star copolymers,and hyperbranched copolymers,have been found with various nanoscale or microscale morphologies,including spherical micelles,worm-like micelles,vesicles,fibers,tubules and films,cylindrical micelles,hamburger-like

关键词： PDMAEMA MULTICOMPARTMENT MORPHOLOGIES SELF-ASSEMBLED FROM FLUORINATED ABC TRIBLOCK TERpolymerS:EFFECTS OF FLEXIBLE AND RIGID HYDROPHOBIC MOIETIES

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Visible light induced living radical polymerization of styrene in the presence of novel diselenide

Visible light induced living radical polymerization of styre...

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2016年两岸三地高分子液晶态与超分子有序结构学术研讨会暨第十四届全国高分子液晶态与超分子有序结构学术论文报告会

作者： Chunlai Ding Jiandong Zhang Xiangqiang Pan Zhengbiao Zhang Jian Zhu Xiulin Zhu Suzhou key Laboratory of Macromolecular Design and Precision Synthesis Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationDepartment of Polymer Science and EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123P.R.China

The objective of this work was to improve the controllability of diselenide based LRP by modifying DPDS structure to synthesis polymers with controlled molecular weight along and narrow molecular weight *** was well-known that the activity of free radical was affected by the structure of substitutions through so called electronic effect and steric effect.

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Combining Orthogonal Chain‐End Deprotections and Thiol–Maleimide Michael Coupling: Engineering Discrete Oligomers by an Iterative Growth Strategy

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Angewandte Chemie 2017年第44期129卷

作者： Zhihao Huang Junfei Zhao Zimu Wang Fanying Meng Kunshan Ding Xiangqiang Pan Nianchen Zhou Xiaopeng Li Zhengbiao Zhang Xiulin Zhu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China Department of Chemistry University of South Florida Tampa Florida 33620 USA

Orthogonal maleimide and thiol deprotections were combined with thiol–maleimide coupling to synthesize discrete oligomers/macromolecules on a gram scale with molecular weights up to 27.4 kDa (128mer, 7.9 g) using an iterative exponential growth strategy with a degree of polymerization (DP) of 2 n −1. Using the same chemistry, a “readable” sequence‐defined oligomer and a discrete cyclic topology were also created. Furthermore, uniform dendrons were fabricated using sequential growth (DP=2 n −1) or double exponential dendrimer growth approaches (DP=2 −1) with significantly accelerated growth rates. A versatile, efficient, and metal‐free method for construction of discrete oligomers with tailored structures and a high growth rate would greatly facilitate research into the structure–property relationships of sophisticated polymeric materials.

关键词： Dendrimere Diskrete Oligomere Iteratives Wachstum Michael-Additionen Thiol-Maleimid-Kupplung

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Effects of ultrahigh pressure extraction on yield and antioxidant activity of chlorogenic acid and cynaroside extracted from flower buds of Lonicera japonica

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Chinese Journal of Natural Medicines 2015年第6期13卷 445-453页

作者： HU Wen GUO Ting JIANG Wen-Jun DONG Guang-Li CHEN Da-Wei YANG Shi-Lin LI He-Ran College of Pharmacy Soochow University Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Soochow University Guiding Long Da Honeysuckle Technology Co. Ltd.

The present study was designed to establish and optimize a new method for extracting chlorogenic acid and cynaroside from Lonicera japonica Thunb. through orthogonal experimental designl. A new ultrahigh pressure extraction （UPE） technology was applied to extract chlorogenic acid and cynaroside from L. japonica. The influential factors, including solvent type, ethanol concentration, extraction pressure, time, and temperature, and the solid/liquid ratio, have been studied to optimize the extraction process, The optimal conditions for the UPE were developed by quantitative analysis of the extraction products by HPLC-DAD in comparison with standard samples. In addition, the microstructures of the medicinal materials before and after extraction were studied by scanning electron microscopy （SEM）. Furthermore, the extraction efficiency of different extraction methods and the 2, 2-diphenyl-1-picrylhydrazyl （DPPH） radical scavenging activities of the extracts were investigated. The optimal conditions for extracting chlorogenic acid and cynaroside were as follows： ethanol concentration, 60%; extraction pressure, 400 MPa; extraction time, 2 rain; extraction temperature, 30 ℃; and the solid/liquid ratio, 1 ： 50. Under these conditions, the yields of chlorogenic acid and cynaroside were raised to 4.863% and 0.080%, respectively. Compared with other extraction methods, such as heat reflux extraction （HRE）, ultrasonic extraction （UE）, and Sohxlet extraction （SE）, the UPE method showed several advantages, including higher extraction yield, shorter extraction time, lower energy consumption, and higher purity of the extracts. This study could help better utilize L. japonica flower buds as a readily accessible source of natural antioxidants in food and pharmaceutical industries.

关键词： Lonicerajaponica Thunb. Ultrahigh pressure extraction Chlorogenic acid Cynaroside Antioxidant activity

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Iron-mediated AGET ATRP of Styrene and Methyl Methacrylate Using Ascorbic Acid Sodium Salt as Reducing Agent

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Chinese Journal of polymer Science 2014年第8期32卷 1010-1018页

作者： Jin-long Pan Zhen Li Li-fen Zhang 程振平朱秀林 Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Soochow University

Atom transfer radical polymerization of styrene （St） and methyl methacrylate （MMA） in bulk and in different solvents using activators generated by electron transfer （AGET ATRP） were investigated in the presence of a limited amount of air using FeC13-6H2O as the catalyst, ascorbic acid sodium salt （AsAc-Na） as the reducing agent, and a cheap and commercially available tetrabutylammonium bromide （TBABr） as the ligand. It was found that polymerization in THF resulted in shorter induction period than that in bulk and in toluene for AGET ATRP of St, while referring to AGET ATRP of MMA, polymerization in THF showed three advantages compared with that in bulk and toluene：1） shortening the induction period, 2） enhancing the polymerization rate and 3） having better controllability. The living features of the obtained polymers were verified by chain end analysis and chain-extension experiments.

关键词： Atom transfer radical polymerization （ATRP） AGET ATRP Iron catalyst Kinetics （polym.）.

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Amplified Detection of Iron Ion Based on Plasmon Enhanced Fluorescence and Subsequently Fluorescence Quenching

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Nano-Micro Letters 2014年第4期6卷 327-334页

作者： Lin Zhou Han Zhang Yanping Luan Si Cheng Li-Juan Fan Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University

A facile and rapid approach for detecting low concentration of iron ion(Fe3+) with improved sensitivity was developed on the basis of plasmon enhanced fluorescence and subsequently amplified fluorescence ***1Ag4@Si O2 nanoparticles were synthesized and dispersed into fluorescein isothiocyanate(FITC) solution. The fluorescence of the FITC solution was improved due to plasmon enhanced fluorescence. However, efficient fluorescence quenching of the FITC/Au1Ag4@Si O2 solution was subsequently achieved when Fe3+, with a concentration ranging from17 n M to 3.4 l M, was added into the FITC/Au1Ag4@Si O2 solution, whereas almost no fluorescence quenching was observed for pure FITC solution under the same condition. FITC/Au1Ag4@Si O2 solution shows a better sensitivity for detecting low concentration of Fe3+compared to pure FITC solution. The quantized limit of detection toward Fe3+was improved from 4.6 l M for pure FITC solution to 20 n M for FITC/Au1Ag4@Si O2 solution.

关键词： Gold–silver alloy Plasmon enhanced fluorescence Fluorescence quenching Iron ion

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design and Development of functional Biodegradable Polycarbonates and Polypeptides for Emerging Biomedical applications

Design and Development of Functional Biodegradable Polycarbo...

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第五届中美高分子科学与工程前沿论坛

作者： Chao Deng Fenghua Meng Ru Cheng Jian Zhang Zhiyuan Zhong Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University

The ever growing biomedical technology such as regenerative medicine and controlled drug release intimately relies on the development of advanced functional biomaterials,among which aliphatic polycarbonates and polypeptides due to their excellent biocompatibility and biodegradability have received the most *** the past years,various types of functional polycarbonates and polypeptides have been

关键词： design and Development of functional Biodegradable Polycarbonates and Polypeptides for Emerging Biomedical applications

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