Polymer Chemistry
·
2017
·Vol. 8
·期 41
·6407-6415
·
IF 5.375
Ke Wang,Yixin Wang,Wangqing Zhang
Diblock copolymer nano-assemblies of poly(2-hydroxypropyl methacrylate-b-benzyl methacrylate) (PHPMA-b-PBzMA) were synthesized by initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) using the CuIIBr2/tris(pyridin-2-ylmethyl)-amine (TPMA) complex as a catalyst under dispersion conditions and were compared with those obtained by RAFT dispersion polymerization. It is found that these two kinds of polymerizations afford good control, as indicated by the linearly increasing molecular weight with monomer conversion and the narrow molecular weight distribution, whereas the ICAR ATRP runs a little faster than RAFT. In the two cases of dispersion polymerization, the morphologies of the PHPMA-b-PBzMA nano-assemblies are similar to each other and change from spheres to wormlike aggregates with block extension, whereas the size of the nano-assemblies by ICAR ATRP is usually larger than those obtained by RAFT. The degree of polymerization (DP) of the poly(2-hydroxypropyl methacrylate) and poly(benzyl methacrylate) blocks affecting the size and/or morphology of the PHPMA-b-PBzMA nano-assemblies is investigated, and the reason for the larger size of the PHPMA-b-PBzMA nano-assemblies by ICAR ATRP is discussed.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 5
·
IF 1.768
Guangfa Zhang,Qinghua Zhang,Qiongyan Wang,Xiaoli Zhan,Fengqiu Chen
A series of gradient fluorinated copolymers with a broad variation of the monomer units in the polymer chain were synthesized via semibatch CPDB-mediated RAFT miniemulsion polymerization technique. In the presence of RAFT agent 2-cyanoprop-2-yl dithiobenzoate (CPDB), the copolymerization of BMA and FMA in miniemulsion exhibited typical features of a controlled molecular weights and narrow polydispersities. The macromolecular structure and thermal behavior of the synthesized fluorinated copolymers were investigated in detail. The DSC analyses show that the gradient copolymers showed a unique thermal behavior with broad range of transition temperature. It was also confirmed that the fluorinated gradient copolymer exhibited obvious surface segregation structure and ultra-low surface energy between 16.8 and 20.3 mN/m. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42936.
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Macromolecular Reaction Engineering
·
2014
·Vol. 9
·期 2
·90-99
·
IF 1.543
Xiaohui Li,Wen-Jun Wang,Bo-Geng Li,Shiping Zhu
This work reported branching studies in reversible addition-fragmentation chain transfer (RAFT) miniemulsion copolymerization of styrene and triethylene glycol dimethacrylate (TEGDMA), and control of branching density distribution using a model-based computer-programed monomer feeding strategy. Highly branched polystyrenes (PS) were produced with small amount of TEGDMA. The branching density experienced drifting in a batch operation. A semi-batch kinetic model by combining the kinetic model for RAFT miniemulsion copolymerization with a semi-batch reactor model was used to design the monomer feeding rate profiles for targeted branching density distributions. A series of hyperbranched PSs with the designed branching density distributions were synthesized.
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 28
·10390-10398
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IF 5.101
Kunmin Yang,Hui Liang,Jiang Lu
A well-defined multifunctional star polymer consisting of reactive and thermoresponsive poly(N-isopropylacrylamide-co-acrolein) arms and an aluminum tris(8-hydroxyquinoline) (Alq3)-bearing fluorescently labeled core was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization using the “arm-first” method. Acrolein, a commercially available aldehyde-bearing monomer, was copolymerized with N-isopropylacrylamide (NIPAM) via RAFT technique in a controlled way to give well-defined linear trithiocarbonate terminated poly(NIPAM-co-acrolein) macro-RAFT agent. The preformed linear macro-RAFT agent was then cross-linked by a tri-vinyl Alq3-containing cross-linker (Alq3 cross-linker) in conjunction with N,N′-methylenebisacrylamide to give the desired reactive, thermoresponsive, and fluorescently labeled star polymer. The resultant star polymer exhibits a lower critical solution temperature at ∼29.8 °C in water, and displays intense greenish-yellow fluorescence with maximum emission peak around 520 nm in both organic solvent (i.e., THF) and water. Moreover, the highly reactive aldehyde functions in the arms of the star polymer could provide the key intermediates to conjugate biomolecules, and the conjugation with an aminooxy-functionalized BSA model protein was also demonstrated as an example of how the novel star polymer can be utilized to conjugate bioactive molecules, constructing fluorescently labeled “smart” polymer-protein conjugates.
研究领域:
高分子化学
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生物材料
·
生物化学
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 29
·16103-16113
·
IF 2.936
Yiting Xu,Jie Cao,Qi Li,Jilu Li,Kaiwei He,Tong Shen,Xinyu Liu,Conghui Yuan,Birong Zeng,Lizong Dai
A series of novel azobenzene-based amphiphilic random copolymers P(POSSMA-co-AZOMA-co-DMAEMA) were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. A light and reduction dual-responsive azo group, pH-responsive tertiary amine group and super hydrophobic POSS moiety were incorporated into the polymer chain to generate multi-stimuli-responsiveness. Self-assembly of these amphiphilic copolymers led to the formation of spherical micelles in aqueous solution. The light, pH and reduction responsive properties of the micelles were investigated systematically by DLS, TEM, UV-vis, FTIR and NMR. The azo groups can undergo trans–cis isomerization under UV light irradiation, thus causing a diameter change of the micelles. Owing to the large proportion of tertiary amine groups in amphiphiles, these micelles showed sensitive pH-response behavior. The hydrophobic azo pendant in the polymer chain completely reduced to a more hydrophilic substituted aniline in a reductive environment, resulting in the increase of overall hydrophilicity of amphiphiles and the disassembly of polymeric micelles. Owing to these multi-stimuli–responses, the polymeric micelles showed rapid and efficient release properties of hydrophobic molecules in response to pH and reductive stimuli.
研究领域:
材料科学
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高分子化学
·
纳米医学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Mingwang Fan,Zengfu Jiao,Xinjie Sun,Shilong Cong,Lingli Jia,Xia Liu,Runbin Xue,Yanfu Pi,Jun Xu
In this study, poly(octadecyl acrylate-co-maleic anhydride) (POM) was synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization, followed by grafting green biomass with maleic anhydride. The chemical structures of the synthesized polymers were characterized by Fourier transform infrared spectroscopy (FT-IR), Proton nuclear magnetic resonance ( 1 H NMR), and Gel permeation chromatography (GPC). The effects of these polymers on the crystallization behavior and cold flowability of waxy crude oil were examined using X-ray diffraction (XRD), differential scanning calorimetry (DSC), polarized light microscopy, and rheological analysis. Addition of octadecyl acrylate-maleic anhydride glyceryl monostearate (OM-GMS) the crystallization activation energy increasing largely from 1.422 to 8.420 kJ mol −1 . When POM was grafted with saturated fatty acids, the crystallinity index ( CI ) decreased by 4.14% compared to unsaturated fatty acids. Viscosity first decreased by 95.4% with OM-GMS addition, then increased with more long-chain alkanes in glyceride. Viscosity first decreased and then increased with increasing grafting rate. At a grafting ratio of 0.4, viscosity decreased by 93.4%. Incorporating green biomass into polymer design is recommended to further reduce reliance on fossil fuels. Future efforts should prioritize replacing conventional monomers in pour point depressants with sustainable biomass-based alternatives, enhancing crude oil flowability while advancing environmental stewardship.
研究领域:
石油工程
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材料科学
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环境科学
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高影响因子
BIOMACROMOLECULES
·
2017
·
IF 5.246
Kun Zhang,Yong-Guang Jia,I-Huang Tsai,Satu Strandman,Li Ren,Liangzhi Hong,Guangzhao Zhang,Ying Guan,Yongjun Zhang,X. X. Zhu
Natural compounds glucosamine and cholic acid have been used to make acrylic monomers which are subsequently used to prepare amphiphilic block copolymers by reversible addition–fragmentation chain transfer (RAFT) polymerization. Despite the striking difference in polarity and solubility, three diblock copolymers consisting of glucosamine and cholic acid pendants with different hydrophilic and hydrophobic chain lengths have been synthesized without the use of protecting groups. They are shown to self-assemble into polymeric micelles with a “bitter” bile acid core and “sweet” sugar shell in aqueous solutions, as evidenced by dynamic light scattering and transmission electron microscopy. The critical micelle concentration varies with the hydrophobic/hydrophilic ratio, ranging from 0.62 to 1.31 mg/L. Longer chains of polymers induced the formation of larger micelles in range of 50–70 nm. These micelles can solubilize hydrophobic compounds such as Nile Red in aqueous solutions. Their loading capacity mainly depends upon the hydrophobic/hydrophilic ratio of the polymers, and may be also related to the length of the hydrophilic block. These polymeric micelles allowed for a 10-fold increase in the aqueous solubility of paclitaxel and showed no cytotoxicity below the concentration of 500 mg/L. Such properties make these polymeric micelles interesting reservoirs for hydrophobic molecules and drugs for biomedical applications.
研究领域:
材料科学
·
药学
·
生物医学工程
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PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 4
·1-9
·
IF 3.061
Zhang Andong,Hao Jingyi,Hou Sen,Shi Ge,He Yanjie,Cui Zhe,Liu Minying,Qiao Xiaoguang,Fu Peng,Pang Xinchang
Aggregation-induced emission (AIE) has already been applied for in-situ monitoring living radical polymerization process. Here we utilized functionalized monomer TPEE as fluoresce probes for the in-situ monitoring of photo-induced RAFT-PISA process. Hydrophilic POEGA macro chain transfer agent (Macro-CTA) was first prepared with light sensitive CTA 4-Cyanopentanoic acid dithiobenzoate, and (2-(4-vinylphenyl)ethene-1,1,2-triyl)tribenzene (TPEE) was copolymerized with styrene to form the hydrophobic block under UV irradiation. The growth of hydrophobic block induced the self-assembly of polymer chains and the emission signal could be observed by naked eyes afterwards. The PL intensity increased with the increase of particle size, as well as the monomer conversion and molecular weight, owing to the enhancement of AIE monomer in the self-assembly latex particles. This no-invasive and facile approach to in-situ visualization and continuously monitoring of the photo-induced RAFT-PISA process might be helpful for both scientific research and commercial application.
研究领域:
高分子化学
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材料科学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 28
·
IF 1.768
Hang Xu,Haicun Yang,Liu Zhang,Qingting Ni,Fanghong Gong
The Core-shell hybrid particles with attapulgite (ATP) as the core and polymethylmethacrylate (PMMA) as the shell (ATP- g -PMMA) were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization method. The diameter of ATP- g -PMMA was increased to 50–60 nm, and the surface hygroscopicity was decreased observably after surface grafting. Then, ATP- g -PMMA hybrid particles were filled into the polycarbonate (PC) by melt mixing to afford nanocomposites, and the mechanical properties, microstructures, thermal stability, and rheological behavior of nanocomposites were investigated by varying ATP- g -PMMA concentration in the range 1, 3, 5, and 7 wt % in PC. Fourier Transform infrared spectroscopy (FTIR) suggested that there is no esterification reaction between particles and matrix. Slight changes in tensile strength, and noticeable decrease of elongation and impact strength were observed with the increase in ATP- g -PMMA particles loading. The morphology evaluated by field-emission scanning electron microscopy (FESEM) indicated that ATP- g -PMMA was dispersed with a diameter range of 80–100 nm, and phase separation was appeared with increasing ATP- g -PMMA loadings. Thermogravimetric analysis (TGA) results revealed the thermal stability of composites was strengthened. The disentanglement and interface slip induced by preferred orientation and directional arrangement of ATP- g -PMMA resulted in lower complex viscosity (η*) and higher loss factor (tan δ) compared with the pristine PC. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42262.
研究领域:
材料科学
·
高分子化学
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Liwen Shen,Jun Liu,Shuangfei Xiang,Chunyan Wu,Shujun Zhao,Feiya Fu,Fang Xu,Guokang Shen,Xiangdong Liu
Multifunctional cotton fabrics have attracted considerable attention due to their versatility and adaptability in various areas of everyday life. Nevertheless, the one-pot fabrication of multifunctional textiles using only a single reagent remains extremely challenging. This approach streamlines the conventional multi-functionalization process and forges novel trajectories for the development of high-performance textile materials enabled by a solitary reagent. Herein, we propose a straightforward approach that uses an innovative block copolymer as the finishing reagent to provide simultaneously both antibacterial and hydrophobic properties to cotton fabrics. The block copolymer was synthesized via a RAFT polymerization of methacrylate (MMA) and dimethylaminoethyl methacrylate (DMA) followed by a quaternization using bromohexadecane. Afterward, the block copolymer underwent self-assembly, resulting in the formation of an aqueous emulsion, which was then applied onto cotton fiber surfaces using an immersion heating process. Characterized by an abundance of particles with a 195-nm average size, the surface morphology of the resulting coating on the fibers imparted highly enduring and effective antibacterial, self-cleaning, and antifouling functionalities to the cotton fabrics. Furthermore, to elucidate the excellent antibacterial effect, an innovative contact-responsive mechanism involving the dynamic action of the copolymer was proposed. With its exceptional versatility and efficiency, this one-pot approach shows great promise for a wide range of industrial applications.
研究领域:
材料科学
·
纺织工程
·
高分子化学
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高影响因子
Polymer Chemistry
·
2012
·Vol. 4
·期 6
·1774-1787
·
IF 5.321
Sipei Li,Jin Han,Chao Gao
A new kind of segmented hyperbranched polymers (SHPs), hyperbranched poly(glycidyl methacrylate)s (HPGMAs), were synthesized via reversible addition–fragmentation chain transfer self-condensing vinyl polymerization (RAFT-SCVP). HPGMAs were efficiently functionalized on the whole scaffold via a collection of click chemistries, including the azidation of oxirane, thiol–epoxy click chemistry, thiol–ene click chemistry, copper-catalyzed azide–alkyne cycloaddition (CuAAC), and Menschutkin chemistry, affording SHPs with hetero-functional groups including hydroxyl + azide, dual hydroxyl, triple hydroxyl, hydroxyl + tertiary amine, hydroxyl + alkene, hydroxyl + carboxyl, alkene + azide, alkyne + azide, hydroxyl + alkyne, dual hydroxyl + alkene etc., all at ∼100% conversion. “Thiol–epoxy + thiol–ene” sequential dual click and “thiol–epoxy + Menschutkin chemistry + CuAAC” triple click strategies were presented, making functional group transformation readily accessible. Hydrophilic dendritic brushes, hydrophobic dendritic brushes and amphiphilic dendritic hetero-brushes were synthesized. Esterification of SHP containing hydroxy and azido groups with 1-pyrenebutyric acid yielded clickable fluorescent macromolecules, which showed a very strong excimer emission.
研究领域:
材料科学
·
化学工程
·
高分子化学
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高影响因子
POLYMER
·
2022
·
IF 4.432
Jianlong Ye,Miaoyuan Guo,Chang Han,Yufeng Zhang,Jianqiang Meng
Hydrophobic charge induction chromatography (HCIC) is becoming an attractive separation technology for antibody purification but suffers from low recovery. Herein we attempted to incorporate temperature responsiveness and strong ion exchange functions onto HCIC membrane adsorber to enhance antibody recovery. We proposed a multifunctional surface modification method combining surface-initiated reversible addition-fracture chain transfer polymerization (SI-RAFT) and the thiolactone chemistry . A regenerated cellulose (RC) membrane was modified by the SI-RAFT of N-isopropylacrylamide (NIPAAm) and thiolactone acrylamide (TIaAm), followed by the “amine-thiol-ene” cascade reaction of thiolactone with tryptamine , a HCIC ligand and methylpropylene trioxyethyl ammonium chloride (METAC), a strong ion exchanger. Temperature, pH and salt effects on IgG and BSA adsorption were investigated. After optimization, the RC-HCIC membrane adsorber had a static adsorption capacity of 41 mg/g for IgG, and an ideal IgG to BSA separation factor of 4.7, under the condition of pH = 7 and T = 30 °C. The membrane showed temperature-responsive IgG uptake from 10 °C to 35 °C. At pH = 5 and T = 10 °C, the recovery of IgG reached 93.5%, and the activity was well retained. These results indicate that the combination of temperature responsiveness of NIPAAm with HCIC is an effective strategy to improve the IgG recovery.
研究领域:
生物技术
·
生物化学
·
材料科学
·
化学工程
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高影响因子
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