JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 10
·
IF 1.866
Fei Fang,Fan Kong,Xueqin Zhang,Mengqi Lin,Yichi Zhang,Shounian Ding
A series of amphiphilic poly(N-vinyl carbazole) (PVK) block copolymers containing tris(8-hydroxyquinoline) aluminum (Alq 3 ) have been synthesized via reversible addition-fragmentation chain transfer (RAFT) radical polymerization with trithiocarbonate terminated polyethylene glycol (PEG) as a RAFT agent. The chemical structures of the block copolymers have been identified by 1 H nuclear magnetic resonance and Fourier transform infrared spectrometer. The analysis of gel permeation chromatography indicates that the polydispersity indices of the block copolymers are lower than 1.30. The results of thermogravimetric analysis show that the decomposition temperatures of the copolymers are higher than 330 ° C . The optical properties of the copolymers have been investigated and the obviously enhanced emission from Alq 3 has been found due to resonance energy transfer from PVK to Alq 3 . © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44573.
研究领域:
高分子化学
·
材料科学
·
光电子学
·
纳米功能材料
·
聚合物合成
·
荧光材料
·
能量转移
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2012
·Vol. 32
·期 6
·1699-1703
·
IF 2.686
Jing Ma,Hou Chen,Min Zhang,Chunhua Wang,Ying Zhang,Rongjun Qu
Yb-based catalyst was used for the first time for atom transfer radical polymerization using activators generated by electron transfer (AGET ATRP) of acrylonitrile (AN) with 2-bromopropionitrile (BPN) as initiator, 2, 2′-bipyridine (bipy) as ligand, and tisn(II) bis(2-ethylhexanoate) (Sn(EH) 2 ) as reducing agent in the presence of air. With respect to AGET ATRP of AN catalyzed by CuBr 2 , an evident increase of polymer tacticity was observed for AGET ATRP of AN. The increase of syndiotacticity became more and more pronounced than the increase of isotacticity of polyacrylonitrile (PAN) along with YbBr 3 content. The block copolymer PAN-b-PMMA with molecular weight at 60,000 and polydispersity at 1.36 was successfully prepared.
研究领域:
高分子化学
·
材料科学
·
催化化学
·
聚合物合成
·
功能材料
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 29
·19457-19464
·
IF 4.493
Ganwei Zhang,Jiwen Hu,Yuanyuan Tu,Guping He,Fei Li,Hailiang Zou,Shudong Lin,Gonghua Yang
The diblock copolymer poly[2,2,2-trifluoroethyl methacrylate-r-styrene]-block-poly[(2-cinnamoyloxyethyl methacrylate)] [P(TFEMA-r-Sty)-b-PCEMA] was synthesized via atom transfer radical polymerization. The copolymer underwent self-assembly in TFEMA/CH2Cl2 to form spherical micelles. Photo-cross-linking of the PCEMA domains of these micelles yielded cross-linked nanoparticles. The cross-linked nanoparticles were subsequently cast from CH2Cl2/methanol solvent mixtures at methanol volume fractions of more than 30% to yield rough surfaces bearing small nanobumps on micron-sized aggregations that were connected together to form cross-linked nanoparticles. These surfaces were superhydrophobic with a water contact angle of 161 ± 1° and a sliding angle of 6 ± 1°. Spraying these nanoparticles onto substrates exhibiting microscale roughness, such as filter paper, by a traditional coating technique also created superhydrophobic surfaces. A thin layer of nanoscale spherical protrusions was observed on the microscale fibers of filter paper by scanning electron microscopy. The coated filter paper samples exhibited a water contact angle and a sliding angle of 153 ± 1° and 9 ± 1°, respectively.
研究领域:
高分子化学
·
材料科学
·
表面科学
·
纳米技术
·
功能材料
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2015
·Vol. 36
·期 15
·1437-1443
·
IF 4.941
Linge Wang,Paul D. Topham,Oleksandr O. Mykhaylyk,Hao Yu,Anthony J. Ryan,J. Patrick A. Fairclough,Wim Bras
Polymer beads have attracted considerable interest for use in catalysis, drug delivery, and photonics due to their particular shape and surface morphology. Electrospinning, typically used for producing nanofibers, can also be used to fabricate polymer beads if the solution has a sufficiently low concentration. In this work, a novel approach for producing more uniform, intact beads is presented by electrospinning self-assembled block copolymer (BCP) solutions. This approach allows a relatively high polymer concentration to be used, yet with a low degree of entanglement between polymer chains due to microphase separation of the BCP in a selective solvent system. Herein, to demonstrate the technology, a well-studied polystyrene-poly(ethylene butylene)–polystyrene triblock copolymer is dissolved in a co-solvent system. The effect of solvent composition on the characteristics of the fibers and beads is intensively studied, and the mechanism of this fiber-to-bead is found to be dependent on microphase separation of the BCP.
研究领域:
高分子科学
·
纳米材料
·
生物医学工程
·
药物递送
·
组织工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 9
·4604-4609
·
IF 2.936
Lei Lü,Hongming Lou,Yinglin Xiao,Guangzhao Zhang,Chaoyang Wang,Yonghong Deng
Triblock copolymer polydopamine-polyacrylic-polyoxyethylene (PDA-PAA-PEO) with excellent performance as a binder for silicon anodes was synthesized. Its structure was confirmed by 1H-NMR, FTIR and UV-vis spectroscopy. Results of electrochemical measurements indicated that a silicon anode based on PDA-PAA-PEO binder exhibited excellent cycle performance with a reversible capacity of 1597 mA h g−1 after 200 cycles at a current density of 0.5 C, much better than that of an electrode based on a polyvinylidene-fluoride binder. Improvement of the cycle performance and reversible capacity for silicon anodes could be attributed to the strong adhesive and high ion conductivity of PDA-PAA-PEO.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Xiuzhe Yin,Linan Wang,Xiaomeng Zhang,Haitao Zhao,Zhe Cui,Peng Fu,Minying Liu,Xinchang Pang,Xiaoguang Qiao
Photo-induced metal free ATRP method was employed for the synthesis of star-shaped polymers. By using 21-Br-β-CD as the macroinitiator, 10-phenylphenothiazine as the photoredox catalyst, star-shaped PtBA homopolymers were synthesized. The photo-induced ATRP displayed all the characteristics of controlled/living polymerization systems and the good light control over the polymerization process. The successful chain extension with MMA demonstrated the high livingness of PtBA “arms” and good controllability of the Photo-induced metal free ATRP. Finally, the achieved PtBA-b-PMMA star-shaped copolymers were used as templates for the preparation of precisely size-tunable CdSe quantum dots after a simple hydrolyzing process.
研究领域:
高分子化学
·
纳米医学
·
药物递送
·
生物材料
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 129
·期 2
·846-852
·
IF 1.289
Hong Yu Yang,Xiu Mei Zhang,Li Jie Duan,Ming Yao Zhang,Guang Hui Gao,Hui Xuan Zhang
A series of environmental pH-responsive block copolymers PEG-polyurethane with tertiary amine groups in the main chain and free carboxyl groups in the side chain were synthesized, including poly(ethylene glycol) (PEG), 1,4-bis (hydroxyethyl) piperazine, 1,6-diisocyanato hexamethylene, and 2,2-dimethylolpropionic acid. The chemical structure, molecular weight, and pH-dependent capacity of pH-responsive PEG-polyurethane were examined by 1 H-NMR, FTIR, gel permeation chromatography (GPC), and an acid-base titration. Moreover, the fluorescent dye fluorescein isothiocyanate was conjugated with PEG-polyurethane by the similar polymerization method and the obtained polymer was measured by ultraviolet visible spectroscopy (UV-vis) and fluorescent spectroscopy. The results indicated that the pH-responsive PEG-polyurethane showed a pH-buffering phenomenon and fluorescent imaging in a range of pH values. As a result, we demonstrated its potential application for optical imaging; however, it is believed that more applications in the areas of biomedicine will be possible owing to its free carboxyl acid terminal residues in the stimuli-responsive polymer. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
研究领域:
生物材料
·
分子影像学
·
高分子化学
·
纳米医学
·
药物递送
·
生物传感器
·
转化医学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2012
·Vol. 213
·期 20
·2192-2200
·
IF 2.361
Xiao-Hui Dai,Chun-Yan Hong,Cai-Yuan Pan
A novel double-hydrophilic block copolymer P(MEO 2 MA- co -OEGMA)- b -PAMA has been successfully synthesized by two-step RAFT polymerization. Then, the amino groups of PAMA blocks in the copolymers react with 1-pyrenecarboxaldehyde via a “Schiff-base” reaction, and the resulting copolymers are self-assembled to form spherical micelles in aqueous solution. Because the “Schiff-base” linkage is pH sensitive, the release rate of pyrene depends upon the pH of solution. Complete release is achieved at pH 1, and the control release is much faster at pH 5.5 than that at pH 7.4. With progress of pyrene release, the micelles are disassembled gradually and disappeared completely at last. This double-hydrophilic copolymer is a promising candidate of drug carrier for the aldehyde- containing hydrophobic drugs.
研究领域:
高分子化学
·
药剂学
·
纳米医学
·
生物材料
·
药物递送系统
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2016
·Vol. 217
·期 9
·1047-1056
·
IF 2.495
Liang Qiu,Chao-Ran Xu,Feng Zhong,Chun-Yan Hong,Cai-Yuan Pan
Pure cross-linked spherical micelles, nanowires, and vesicles are successfully fabricated from poly(2-hydroxypropyl methacrylate- b - p -(methacryloxyethoxy)benzaldehyde)s (PHPMA– b –PMAEBAs) through reversible addition-fragmentation chain transfer dispersion polymerization of MAEBA in methanol using PHPMA as a macro-CTA and subsequent cross-linking. The cross-linking reaction is conducted by stirring a mixture of 1,4-butanediamine and the resultant nano-objects in methanol at room temperature. For all polymerizations with feed molar ratios of MAEBA/PHPMA ranging from 75/1 to 240/1, the monomer MAEBA conversions are almost complete, and block copolymers with controlled molecular weight are obtained. The transmission electron microscopy, dynamic light scattering, and gel permeation chromatography results reveal that the following three factors significantly influence the morphology of the nano-objects: the feed molar ratio of MAEBA/PHPMA, the copolymer concentration, and the degree of polymerization of PHPMA. The cross-linked nano-objects are very stable in good solvents, the spheres and nanowires slightly decrease in size after cross-linking, whereas the vesicles slightly increase in size. The cross-linked nano-objects are stable in neutral solutions, but they dissociate in weekly acidic solutions. The loading of 1-pyrenemethylamine (PMA) into the vesicles and the unloading of PMA from the vesicles are studied.
研究领域:
高分子化学
·
纳米材料
·
药物递送
·
生物医学工程
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Jianhua Zhou,Hong Li,Yannan Li,Xiang Li
Cellulose nanocrystals (CNCs) were modified using an amphiphilic triblock copolymer [poly(2-(dimethylamino) ethyl methacrylate)- b -poly(glycidyl methacrylate)- b -poly(2,2,3,4,4,4-hexafluorobutyl acrylate) (PDMAEMA- b -PGMA- b -PHFBA)] bearing epoxy functionalities located in middle segment of PGMA, which were used to react with the hydroxyl groups on the surface of the CNCs. The triblock copolymer was synthesized via a reversible addition fragmentation chain transfer (RAFT) polymerization reaction between 2-(dimethylamino) ethyl methacrylate, glycidyl methacrylate and 2,2,3,4,4,4-hexafluorobutyl acrylate, and characterized using 1 H-NMR spectroscopy and size exclusion chromatography (SEC). The successful modification of the CNCs was demonstrated by means of FT-IR, TGA , TEM , XRD and XPS . In addition, the surface properties of the modified CNCs were studied using water contact angle and surface tension studies. When compared with the pristine CNCs, the modified CNCs exhibited a higher contact angle and lower surface tension. Good dispersion of the modified CNCs was observed in different polar solvents, such as water, THF, DMF , CHCl 3 and toluene. The modified CNCs exhibited pH responsive properties, which were measured using dynamic light scattering (DLS). In addition, the stability of Pickering emulsions stabilized by PDMAEMA- g -CNC- g -PHFBA decreased with time or increasing pH. The droplet size increased gradually upon increasing the pH. This work provides a method to design sophisticated CNC-based materials, which benefit from both the intrinsic properties of the CNCs and the new characteristics conferred by the multifunctional grafted chains.
研究领域:
高分子化学
·
纳米材料科学
·
胶体与界面化学
·
生物基功能材料
·
智能响应材料
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 10
·2633-2645
·
IF 2.41
Cong Houluo,Zheng Sixun
In this contribution, we reported the synthesis of poly( N -isopropylacrylamide)- block -poly(acrylic acid) (PNIPAAm- b -PAA) copolymer networks via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization. The PNIPAAm- b -PAA block copolymer networks were characterized by means of Fourier transform infrared spectroscopy (FTIR) and small angle X-ray scattering (SAXS). The volume phase transition (VPT) temperatures of the PNIPAAm- b -PAA hydrogels were measured by means of micro-differential scanning calorimetry (micro-DSC). It was found that the block copolymer hydrogels displayed the VPT temperatures lower than the control PNIPAAm hydrogel. Compared to the control PNIPAAm hydrogel, the deswelling and reswelling properties of the block copolymer hydrogels were significantly improved. The improved thermoresponsive properties of the PNIPAAm- b -PAA hydrogels have been interpreted on the basis of the formation of the architecture of the block copolymer networks.
研究领域:
高分子化学
·
生物材料
·
药物递送
·
组织工程
·
智能响应材料
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 52
·1905451
·
IF 10.856
Lijun Ji,Mindong Gong,Tong Xu,Jun Gu,Xu Jiang,Taotao Liang,Yu Chen,Qingren Liu
The interactions of ions and molecules with material surface are highly dependent on the surface properties of the material. Therefore, the distribution of ions or molecules near the material surface may be affected by the surface properties. This phenomenon can be significant enough for controlling the structure of a material synthesized in the sub-micrometer scale confinement space of a template. This work confirms that inverse opals are perfect templates for offering confinement space, while their different surface properties can strongly affect ion and block copolymer distribution in the confinement space. This surface effect principle can be used for the controlled synthesis of colloids with complex composition. As an example, four kinds of mesoporous magnetic bioactive glass colloids with ordered mesopores, core–shell structure, open surface pores, or disordered mesopores are prepared by using polystyrene and carbon inverse opal templates. This work reveals that inverse opal templates possess great advantage in controlled synthesizing colloidal structures due to their surface effect on ions and molecules and confinement space.
研究领域:
生物材料学
·
纳米医学
·
组织工程
·
药物递送
·
生物矿化
·
胶体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）