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- 저자 : Lizong Dai (검색결과 4 건)
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Yiting Xu,Jiamei Huang,Yuntong Li,Meijie Wang,Ying Cao,Conghui Yuan,Birong Zeng,Lizong Dai 한국고분자학회 2017 Macromolecular Research Vol.25 No.8
A novel zwitterionic hybrid amphiphilic copolymer containing polyhedral oligomericsilsesquioxane (POSS), and poly(methacrylate isobutyl POSS)-b-poly (3-dimethyl(methacryloyloxyethyl) ammonium propane sulfonaten-co-2-(diethylamino) ethyl methacrylate-co-styrene) (PMAiBuPOSS-b-P(DMAPS-co-DMAEMAco- St)), was prepared by the ring open reaction of 1, 3-propane sultone with tertiary amine on the precursor polymer. This hybrid copolymer could self-assemble into spherical micelle with a relatively narrow size distribution. The micelle size exhibited a great dependence on pH, as the size of the micelles was of evidently decreases with the increase of the pH value. Controllable release of pyrene from the micelles was investigated by fluorescent emission spectra. Micelles with more zwitterionic units would lead to less pyrene release and longer equilibrium time. The protein adsorption resistance of the micelles was tested by mixing them with fetal bovine serum. The antifouling ability was improved by increasing the number of zwitterionic units as well as decreasing the number of DMAEMA units. This novel hybrid amphiphilic random copolymer with the pH-responsive and anti-protein-fouling ability, can be potentially used for drug carriers for controlled release.
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Yiting Xu,Jianjie Xie,Lingnan Chen,Conghui Yuan,Yinyin Pan,Ling Cheng,Weiang Luo,Birong Zeng,Lizong Dai 한국고분자학회 2013 Macromolecular Research Vol.21 No.12
A novel organic/inorganic hybrid amphiphilic random copolymer poly(methacrylate isobutyl POSS-co-N-isopropylacrylamide-co-oligo(ethylene glycol) methyl ether methacrylate-co-2-vinylpyridine), poly(MAPOSS-co-NIPAM-co-OEGMA-co-2VP), was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. The self-assembly behavior of random copolymers in aqueous solution was investigated by dynamic light scattering (DLS) as well as transmission electron microscopy (TEM). The results indicate the novel random copolymer in water could self-assemble into spherical aggregates and the self-aggregate size displays a remarkable dependence on pH. The stimuli-responsive characteristics of these assembles were tested by means of UV-vis spectra,DLS and TEM. There is a critic Zn2+ concentration over which the aggregates can be coordinated into well-define spherical aggregate clusters. The critic Zn2+ concentration can be tuned finely through adjusting solution concentration or 2VP amount. Results from UV-vis and DLS reveal that the copolymer solutions exhibit a sharp and intensive lower critical solution temperature (LCST). Some factors such as the solution concentration, molecular weight, pH and copolymer generation, which could affect the cloud point, were studied systematically. The essentially predetermined LCST can be achieved by altering the content of 2VP or pH. In addition, these novel hybrid aggregates can undergo an association/disassociation cycle with the heating and cooling of solution and the degree of reversibility shows a strong concentration dependence. As a novel organic-inorganic hybrid material which can respond to multiple external stimuli including temperature, pH, metal ions with sharp stimuli-responsive behaviors, it is potentially used for biomedicine, catalysis, diagnostics, bioseparations, biosensors and for fundamental investigation.
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Interpenetration Enhancing of Chitosan-PEGLM Double Network (DN) Hydrogel and Its Properties
Yiting Xu,Jianjie Xie,Hui Gao,Ying Cao,Min Chen,Yanling Liu,Birong Zeng,Feng-Chih Chang,Lizong Dai 한국고분자학회 2015 Macromolecular Research Vol.23 No.1
A series of polylactic acid-polyethylene glycol-polylactic acid diacrylate macromers (PEGLM) were synthesized,and a novel chitosan-PEGLM double network (DN) hydrogel was further successfully fabricated by thesequential interpenetrating technology with highly cross-linked chitosan as the rigid component and PEGLM as theflexible component. Their structures and components were characterized by 1H NMR, FTIR, and XRD. Their fracturemorphology was investigated by SEM. It was interesting to found that the compressive strength of hydrogel woundreach its maximum value when the chitosan content was 10%, no matter what the molecular weight of PEGLM componentwas. What’s more, we found that the compressive strength of 6KL7 could reach 1.07 MPa at gel state, whosePEG segment molecular weight was 6,000, and polymerization degree of PLA was 7. The effects of glutaraldehyderatio, polymerization degree of PLA, and molecular weight of PEG segment on the mechanical strength of DNhydrogels were also discussed in this article. To further strengthen DN hydrogels, the double network-linear (DNL)hydrogels were fabricated by introducing linear poly(vinyl alcohol) (PVA) into the DN hydrogels. The DN-Lhydrogels exhibited better mechanical properties, with the compressive strength up to 1.45 MPa. These hydrogelsmay have prospective applications in the fields of wound dressing, artificial cartilage and tissue engineering scaffoldmaterials which require high mechanical properties.
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Ying Cao,Aoqi Zhu,Jianmin He,Jianhua Wu,Mingjin Xue,Yiting Xu,Birong Zeng,Guorong Chen,Lizong Dai 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
A novel kind of core cross-linked assemblies formed from a ‘‘semi-amphiphilic” block copolymer, poly(syringaldehyde methacrylate)-block-poly (dopamine methacrylate-co-methyl methacrylate-costyrene)(PSMA-b-P(DMA-co-MMA-co-St)), was designed and served as the carrier for anti-corrosiveand corrosion detective molecules. Different from the core cross-linked micelles formed by the amphiphilicpolymers in water, the core cross-linked assemblies in this research were formed from the ‘‘semiamphiphilic”block copolymer, which took advantage of the different compatibility between epoxy andthe blocks in the polymer, leading to the self-assembly behavior happening in the organic resin, whilethey shared the advantages of traditional core cross-linked micelles with the properties of being stable,stimuli-responsive and multifunctional. The pH-responsive properties of the assemblies and their complexationwith Fe3+ caused by the corrosion of the steel were confirmed by UV spectrophotometry andXPS analysis of the corrosive products. The controlled release of corrosion inhibitors was fully reflectedby the expansion of the capacitor ring and the increase of the coating resistance (Rc) with the extensionof the immersion time, which was got via fitting the electrochemical impedance spectroscopy (EIS) datawith the equivalent electric circuits. Ultimately, the anti-corrosive mechanism of smart coating with thefunctional core cross-linked assemblies were also illustrated.
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