Yong Huang

Find an error

Name: 黄勇; Yong Huang

Organization: Institute of Chemistry, Chinese Academy of Sciences , China

Department: Institute of Chemistry

Title: Professor(PhD)

TOPICS

Polymer

Chemicals
References

Synthesis, self-assembly and redox-responsive properties of well-defined hydroxypropylcellulose-graft-poly(2-acryloyloxyethyl ferrocenecarboxylate) copolymers

Co-reporter:Pingping Li;Hongliang Kang;Ning Che;Zhijing Liu;Chao Zhang;Chun Cao;Weiwei Li;Ruigang Liu

Polymer International 2015 Volume 64( Issue 8) pp:1015-1022

Publication Date(Web):

DOI:10.1002/pi.4879

Abstract

Well-defined amphiphilic graft copolymers, hydroxypropylcellulose-graft-poly(2-acryloyloxyethyl ferrocenecarboxylate) (HPC-g-PAEFC), were synthesized via atom transfer radical polymerization. The graft copolymers contain hydrophilic thermo-responsive HPC backbones and hydrophobic redox-sensitive PAEFC side chains and can self-assemble into spherical micelles in aqueous solution, with a hydrodynamic radius <R_h > in the range 70–130 nm depending on length of the graft chains. The thermo-responsive properties of the HPC-g-PAEFC copolymers in aqueous solution are gradually destroyed with increasing length of PAEFC side chains. The redox-responsive behaviors of the graft copolymers were investigated with H₂O₂ and sodium ascorbate as oxidant and reductant, respectively, indicating an incompletely reversible redox-triggered size transition. And the reversibility of the redox process becomes weaker gradually as the side chains are more difficult to be oxidized with an increase of the graft chains, which is evidenced from cyclic voltammetry measurements. The resultant HPC-g-PAEFC graft copolymers with the unique properties of ferrocene and cellulose provide prerequisites for amperometric biosensors and redox-responsive drug delivery carriers. © 2015 Society of Chemical Industry

An effect of alginate on the stability of LDH nanosheets in aqueous solution and preparation of alginate/LDH nanocomposites

Co-reporter:Hongliang Kang, Yang Shu, Zhuang Li, Bo Guan, Shunjin Peng, Yong Huang, Ruigang Liu

Carbohydrate Polymers 2014 100() pp: 158-165

Publication Date(Web):

DOI:10.1016/j.carbpol.2013.07.051

Osmium Bipyridine-Containing Redox Polymers Based on Cellulose and Their Reversible Redox Activity

Co-reporter:Hongliang Kang, Ruigang Liu, Huafeng Sun, Jieming Zhen, Qinmei Li, and Yong Huang

The Journal of Physical Chemistry B 2012 Volume 116(Issue 1) pp:55-62

Publication Date(Web):December 7, 2011

DOI:10.1021/jp2083488

Thermo-, pH-, and electrochemical-sensitive cellulose graft copolymers, hydroxypropyl cellulose-g-poly(4-vinylpyridine)-Os(bipyridine) (HPC-g-P4VP-Os(bpy)), were synthesized and characterized. The electrochemical properties of the resulting material were investigated via cyclic voltammetry by coating the graft copolymers on the platinized carbon electrode. The results indicated that the electrochemical properties of the graft copolymer modified electrode were responsive to the pH values of the electrolyte solution. The reversible transformation between the active and inactive state originated from the changes in the architecture of the HPC-g-P4VP-Os(bpy) graft copolymer at different pH values. At high pH (e.g., above the pKa of P4VP), the chains of P4VP collapsed, and the electrochemical activity of the electrode was reduced. With immobilization of glucose oxidase (GOx) on the graft copolymer decorated electrode, a biosensor for glucose detection was prepared. The current of the biosensor depended on the glucose concentration in the detected solution and increased with the successive addition of glucose.

Coil-to-rod conformational transition and single chain structure of graft copolymer by tuning the graft density

Co-reporter:Wenyong Liu, Yuejun Liu, Guangsheng Zeng, Ruigang Liu, Yong Huang

Polymer 2012 Volume 53(Issue 4) pp:1005-1014

Publication Date(Web):17 February 2012

DOI:10.1016/j.polymer.2012.01.006

The chain conformation and individual chain structures of the graft copolymers ethyl cellulose grafting poly (acrylic acid) (EC-g-PAA) were investigated by laser light scattering (LLS) and atom force microscopy (AFM). The EC-g-PAA graft copolymers with two different side chain lengths and side chain grafting densities were synthesized via atom transfer radical polymerization (ATRP) from ethyl cellulose as the backbone. The graft copolymer molecules are adsorbed on the mica surface, and the observed single molecule structures by AFM reflect the molecular conformation in solution. An increase of the graft density of the graft copolymer induces the conformational transition due to the repulsion between side chains from coil to rod conformation. The observed disclike and rodlike single chain structures response to the coil and rod conformations, respectively. The results provide a direct visual experimental evidence of chain conformational and single chain structural transitions for graft copolymers in common solvents induced by graft density.

One-Step Dispersion of Cellulose Nanofibers by Mechanochemical Esterification in an Organic Solvent

Co-reporter:Pei Huang;Dr. Min Wu; Shigenori Kuga;Dr. Deqian Wang;Dr. Dayong Wu; Yong Huang

ChemSusChem 2012 Volume 5( Issue 12) pp:2319-2322

Publication Date(Web):

DOI:10.1002/cssc.201200492

Synthesis, self-assembly and drug release behaviors of pH-responsive copolymers ethyl cellulose-graft-PDEAEMA through ATRP

Co-reporter:Deqian Wang, Junjun Tan, Hongliang Kang, Lin Ma, Xin Jin, Ruigang Liu, Yong Huang

Carbohydrate Polymers 2011 Volume 84(Issue 1) pp:195-202

Publication Date(Web):11 February 2011

DOI:10.1016/j.carbpol.2010.11.023

The pH-responsive ethyl cellulose graft poly(2-(diethylamino) ethyl methacrylate) (EC-g-PDEAEMA) copolymers were synthesized through atom transfer radical polymerization (ATRP). Kinetic analysis confirmed the reaction is living and controllable. The graft copolymers can form micelles in acid aqueous medium. The critical micelle concentration (CMC) of the graft copolymers decreases with the increase of the graft length and graft density. The resultant micelles show the pH-sensitivity. The decrease in the hydrodynamic radius of the micelles at pH 6–6.9 attributes to collapse of the side PDEAEMA chains in the shell of the micelles due to the deprotonation, which was further confirmed by TEM observation. The loading and controlled release of drugs in the micelles was investigated by using rifampicin (RIF) as the model drug. It was found that the cumulant release of RIF in the buffer solution at pH 6.6 is higher than that at pH 7.4.

Self-Assembly and Dual-Stimuli Sensitivities of Hydroxypropylcellulose-graft-poly(N,N-dimethyl aminoethyl methacrylate) Copolymers in Aqueous Solution

Co-reporter:Lin Ma, Ruigang Liu, Junjun Tan, Deqian Wang, Xin Jin, Hongliang Kang, Min Wu and Yong Huang

Langmuir 2010 Volume 26(Issue 11) pp:8697-8703

Publication Date(Web):February 3, 2010

DOI:10.1021/la904431z

The self-assembly and pH- and thermo-sensitivities properties of hydroxypropyl cellulose-graft-poly(N,N-dimethyl aminoethyl methacrylate) (HPC-g-PDMAEMA) copolymers in aqueous solutions were investigated by transmittance, dynamic light scattering (DLS), and 1H NMR spectroscopy. Micelles with different structure can be formed by varying either pH value or temperature. At low pH, e.g., 3.0, the HPC backbone of the copolymer collapse to form the core of micelles stabilized with protonated PDMAEMA side chains on the surface of the micelles upon heating. At the medium pH, e.g., 8.1, both HPC backbone and PDMAEMA side chains collapse upon heating to form unstable aggregates. At high pH, e.g., 12.3, PDMAEMA side chains collapse first to form the core of micelles stabilized with HPC chains upon heating. Further heating the copolymer solution at this pH leads to the aggregation of the micelles due to the collapse of the shell HPC chains. The thermal sensitivity of the HPC-g-PDMAEMA copolymers is reversible.

Crosslinking of the electrospun polyethylene glycol/cellulose acetate composite fibers as shape-stabilized phase change materials

Co-reporter:Changzhong Chen, Linge Wang, Yong Huang

Materials Letters 2009 Volume 63(Issue 5) pp:569-571

Publication Date(Web):28 February 2009

DOI:10.1016/j.matlet.2008.11.033

In a previous study, polyethylene glycol/cellulose acetate (PEG/CA) composite ultrafine fibers have been prepared by electrospinning. In order to improve their water-resistant ability and thermal stability for potential thermal storage applications, in this study, the electrospun PEG/CA fibers were crosslinked by using toluene-2, 4-diisocyanate (TDI). The morphology and thermal properties of the crosslinked fibers were investigated via SEM, DSC and TG, respectively. The results showed that the fibrous morphology of the crosslinked fibers was well preserved even after 24 h immersing in deionized water. Meanwhile, the crosslinking also led to an improvement on the thermal stability, but brought a decrease of the enthalpy compared with the original electrospun fibers.

Cellulose-based solid–solid phase change materials synthesized in ionic liquid

Co-reporter:Yanxiang Li, Min Wu, Ruigang Liu, Yong Huang

Solar Energy Materials and Solar Cells 2009 93(8) pp: 1321-1328

Publication Date(Web):

DOI:10.1016/j.solmat.2009.02.005

A novel shape-stabilized PCM: Electrospun ultrafine fibers based on lauric acid/polyethylene terephthalate composite

Co-reporter:Changzhong Chen, Linge Wang, Yong Huang

Materials Letters 2008 Volume 62(Issue 20) pp:3515-3517

Publication Date(Web):31 July 2008

DOI:10.1016/j.matlet.2008.03.034

Recently, ultrafine fibers of PCM/polymer composites have been developed as a novel shape-stabilized polymer-matrix phase change material (PCM) via electrospinning technique. In this study, ultrafine fibers of lauric acid/polyethylene terephthalate (LA/PET) composite (1:1, w/w) were successfully prepared and characterized by field-emission scanning electron microscopy (FE-SEM), differential scanning calorimetry (DSC) and tensile testing. The results indicated that the electrospun fibers showed smooth surfaces and cylindrical shape with diameters ranging from several tens to several hundreds nanometer, and the latent heat of fusion of the fibers is about 70.76 J/g. Although the tensile properties of the electrospun composite fibers were lower than that of the electrospun pure PET fibers, they showed suitable and competent tensile strength for the potential applications in solar energy storage and thermo-regulating textile.

Clathrate (δ) Form Crystal Transitions of Syndiotactic Polystyrene in Atactic Polystyrene Networks

Co-reporter:Xia Gao, Ruigang Liu, Yong Huang, Oleksiy Starykov and Wilhelm Oppermann

Macromolecules 2008 Volume 41(Issue 7) pp:2554-2560

Publication Date(Web):March 8, 2008

DOI:10.1021/ma701988w

Syndiotactic polystyrene (sPS) δ crystals within atactic polystyrene (aPS) and atactic polystyrene networks (aPSNW) were prepared. The polymorphism behaviors of sPS within aPS and aPSNW were studied by in-situ wide-angle X-ray diffraction (WAXD) and differential scanning calorimeter (DSC). The sPS δ crystals transfer into γ and then α form crystals during the gradually heating process. The transition temperature of the δ to γ form crystals decreases with the increase in the aPS and aPSNW content in all samples. By contrast, the transition temperature of γ-to-α form crystals increases with the rising aPSNW content, whereas it is independent of the content of aPS. Meanwhile, the transition temperatures of δ to γ and γ to α in aPSNW are higher than those in linear aPS blends. When the samples were annealed at a temperature above 150 °C, the sPS δ form is not favorable to transform into the β form in aPSNW. The results indicate that polymorphism behaviors of sPS are disturbed within aPS networks.