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Organic conjugated polymers and polymer dots as photocatalysts for hydrogen production

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 667-677 doi: 10.1007/s11708-021-0767-7

Abstract: to the outstanding characteristics of tailorable electronic and optical properties, semiconducting polymers

Keywords: polymer dots (Pdots)     photocatalysis     hydrogen production    

A mini review: Shape memory polymers for biomedical applications

Kaojin Wang, Satu Strandman, X. X. Zhu

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 2,   Pages 143-153 doi: 10.1007/s11705-017-1632-4

Abstract: Shape memory polymers (SMPs) are smart materials that can change their shape in a pre-defined manner

Keywords: shape memory polymer     biodegradability     biocompatibility     biomedical application     bile acids    

Multifunctional antimicrobial chlorhexidine polymers by remote plasma assisted vacuum deposition

Ana Mora-Boza, Francisco J. Aparicio, María Alcaire, Carmen López-Santos, Juan P. Espinós, Daniel Torres-Lagares, Ana Borrás, Angel Barranco

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 2,   Pages 330-339 doi: 10.1007/s11705-019-1803-6

Abstract: Novel antibacterial materials for implants and medical instruments are essential to develop practical strategies to stop the spread of healthcare associated infections. This study presents the synthesis of multifunctional antibacterial nanocoatings on polydimethylsiloxane (PDMS) by remote plasma assisted deposition of sublimated chlorhexidine powders at low pressure and room temperature. The obtained materials present effective antibacterial activity against K12, either by contact killing and antibacterial adhesion or by biocide agents release depending on the synthetic parameters. In addition, these multifunctional coatings allow the endure hydrophilization of the hydrophobic PDMS surface, thereby improving their biocompatibility. Importantly, cell-viability tests conducted on these materials also prove their non-cytotoxicity, opening a way for the integration of this type of functional plasma films in biomedical devices.

Keywords: plasma polymers     conformal plasma deposition     chlorhexidine     bactericide     PDMS     biocompatibility    

Photoinduced dichroism and surface-relief-gratings of hyperbranched azo polymers synthesized by azo-coupling

CHE Pengchao, HE Yaning, WANG Xiaogong

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 4,   Pages 360-364 doi: 10.1007/s11705-007-0065-x

Abstract: The resulting azo polymers were characterized by the spectroscopic methods and thermal analysis.Thin films of the hyperbranched azo polymers were used to fabricate surface-relief-gratings (SRGs) byThe hyperbranched azo polymers can potentially be used for applications such as reversible optical data

Keywords: inscription     4-cyanoaniline     orientation     peripheral     photoswitch    

Tetrazole tethered polymers for alkaline anion exchange membranes

Erigene Bakangura, Yubin He, Xiaolin Ge, Yuan Zhu, Liang Wu, Jin Ran, Congliang Cheng, Kamana Emmanuel, Zhengjin Yang, Tongwen Xu

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 2,   Pages 306-310 doi: 10.1007/s11705-017-1690-7

Abstract: The formation of a tetrazole-ion network in the resulting polymers was found to promote the hydroxide

Keywords: anion exchange membrane     fuel cell     phase separation     tetrazole    

Synthesis and characterization of well-defined comb-like branched polymers

LI Aixiang, LU Zaijun, LÜ Zijian

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 4,   Pages 407-411 doi: 10.1007/s11705-008-0064-6

Abstract: Well-defined comb-like branched polymers having one branch in each repeating unit have been successfullyThe resulting comb-like branched polymers were characterized by IR, H-NMR, gel permeation chromatographyThe results show that when excess living polymers were used, the almost quantitative grafting efficiency

Keywords: grafting efficiency     polyisoprene     quantitative grafting     effective     molecular    

Thermal degradation characteristics and products obtained after pyrolysis of specific polymers found

Evangelia C. Vouvoudi, Aristea T. Rousi, Dimitris S. Achilias

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 5, doi: 10.1007/s11783-017-0996-5

Abstract: study was to investigate the thermal degradation and the products obtained after pyrolysis of specific polymersPolymers studied include ABS, HIPS, PC and a blend having a composition similar to that appearing inIt was found that, PC shows greater heat endurance compared to the other polymers, whereas ABS depolymerizesThe existence of several polymers in the blend results in synergistic effects which decrease the onset

Keywords: Pyrolysis     WEEE recycling     ABS     HIPS     PC     Py-GC/MS     TGA    

Surface molecularly imprinted polymers for solid-phase extraction of (--)-epigallocatechin gallate from

Yunling Gao,Ying Hu,Kejian Yao

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 4,   Pages 467-478 doi: 10.1007/s11705-015-1526-2

Abstract: Surface molecularly imprinted polymers (SMIPs) have been synthesized to selectively determine (−)-epigallocatechinThe imprinted polymers were found to have a highly specific recognition and binding capacity for (−)-

Keywords: β-cyclodextrin     (−)-epigallocatechin gallate     surface molecular imprinting     solid-phase extraction    

Microbial biodegradation of plastics: Challenges, opportunities, and a critical perspective

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1596-6

Abstract:

● Health hazards of plastic waste on environment are discussed.

Keywords: Plastic-waste     Polymers     Health-hazards     Biodegradation     Microorganisms     Enzymes    

The influence of curing conditions on the mechanical properties and leaching of inorganic polymers made

Remus I. Iacobescu, Valérie Cappuyns, Tinne Geens, Lubica Kriskova, Silviana Onisei, Peter T. Jones, Yiannis Pontikes

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 317-327 doi: 10.1007/s11705-017-1622-6

Abstract: This study reports on the impact of the curing conditions on the mechanical properties and leaching of inorganic polymer (IP) mortars made from a water quenched fayalitic slag. Three similar IP mortars were produced by mixing together slag, aggregate and activating solution, and cured in three different environments for 28 d: a) at 20 °C and relative humidity (RH) ~ 50% (T20RH50), b) at 20 °C and RH≥90% (T20RH90) and c) at 60 °C and RH ~ 20% (T60RH20). Compressive strength (EN 196-1) varied between 19 MPa (T20RH50) and 31 MPa (T20RH90). This was found to be attributed to the cracks formed upon curing. Geochemical modelling and two leaching tests were performed, the EA NEN 7375 tank test, and the BS EN 12457-1 single batch test. Results show that Cu, Ni, Pb, Zn and As leaching occurred even at high pH, which varied between 10 and 11 in the tank test’s leachates and between 12 and 12.5 in the single batch’s leachates. Leaching values obtained were below the requirements for non-shaped materials of Flemish legislation for As, Cu and Ni in the single batch test.

Keywords: inorganic polymer     geochemical leaching modelling     heavy metals     recycling     non-ferrous fayalitic slag     curing    

Material Mechanical Properties Necessary for the Structural Intervention of Concrete Structures Article

Tamon Ueda

Engineering 2019, Volume 5, Issue 6,   Pages 1131-1138 doi: 10.1016/j.eng.2019.02.012

Abstract: to concrete and steel, which are typical materials for concrete structures, various fiber-reinforced polymers(FRP), cementitious materials with fibers, polymers, and adhesives are often applied for structural

Keywords: Structural intervention     High fracturing strain     No yielding     Low stiffness     Roughness     fiber-reinforced polymers     Polymers    

Predictive calculations of gas solubility and permeability in glassy polymeric membranes: An overview

Matteo Minelli, Maria Grazia De Angelis, Giulio C. Sarti

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 405-413 doi: 10.1007/s11705-017-1615-5

Abstract: The possibility to evaluate in a predictive way the relevant transport properties of low molecular weight species, both gases and vapors, in glassy polymeric membranes is inspected in detail, with particular attention to the methods recently developed based on solid thermodynamic basis. The solubility of pure and mixed gases, diffusivity and permeability of single gases in polymer glasses are examined, considering in particular poly(2,6-dimethyl-1,4-phenylene oxide) as a relevant test case. The procedure clearly indicates what are the relevant physical properties of the polymer matrix and of the penetrants required by the calculations, which can be obtained experimentally through independent measurements. For gas and vapor solubility, the comparison with direct experimental data for mixed gases points out also the ability to account for the significant variations that solubility-selectivity experiences upon variations of pressure and/or feed composition. For gas and vapor permeability, the comparison with direct experimental data shows the possibility to account for the various different trends observed experimentally as penetrant pressure is increased, including the so-called plasticization behavior. The procedure followed for permeability calculations leads also to clear correlations between permeability and physical properties of both polymer and penetrant, based on which pure predictive calculations are reliably made.

Keywords: solubility     permeability     glassy polymers     NELF model     diffusion    

Synthesis of poly(maleic acid alkylamide-

Jingjing XU, Jun XU, Jie SUN, Shili XING, Li LI, Xuhong GUO

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 1,   Pages 74-78 doi: 10.1007/s11705-010-0542-5

Abstract: To improve the flow ability of crude oil with high content of aromatic asphaltenes, new comb-type copolymers of poly(maleic anhydride- - -olefin- -styrene) (MASCs) with different ratios of maleic anhydride (MA) to styrene were designed and synthesized. H NMR and FTIR spectra were used to characterize the chemical structure of the copolymers. The effect of copolymers on the flow ability of model waxy oil and crude oil were studied by rheological method and polarizing light microscopy. Upon the addition of MASCs, the yield stresses of oils were decreased by 1 to 3 orders of magnitude, and the morphology of paraffin crystals were reduced and changed from plates to needles.

Keywords: comb-polymers     styrene     paraffin     crystallization     flow ability    

Application of membrane separation technology in post-combustion carbon dioxide capture process

Mo LI,Xiaobin JIANG,Gaohong HE

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 2,   Pages 233-239 doi: 10.1007/s11705-014-1408-z

Abstract: Membrane separation technology is a possible breakthrough in post-combustion carbon dioxide capture process. This review first focuses on the requirements for CO separation membrane, and then outlines the existing competitive materials, promising preparation methods and processes to achieve desirable CO selectivity and permeability. A particular emphasis is addressed on polyimides, poly (ethylene oxide), mixed-matrix membrane, thermally-rearranged polymer, fixed site carrier membrane, ionic liquid membrane and electrodialysis process. The advantages and drawbacks of each of materials and methods are discussed. Research threads and methodology of CO separation membrane and the key issue in this area are concluded

Keywords: membranes     carbon dioxide capture     separation     polymers     post-combustion    

Oilfield Chemical Additives in Drilling: Current Applications & Development Trend

Liu Rushan,Su Changming

Strategic Study of CAE 2002, Volume 4, Issue 5,   Pages 88-92

Abstract: oilfield chemistry theory, to design molecules, develop new-style monomers, synthesize new types of polymers, and develop modified products of multifunctional natural polymers with environmental-amity.

Keywords: oil field additives     drilling & completion fluid     reservoir protectiori     multifunctional polymers    

Title Author Date Type Operation

Organic conjugated polymers and polymer dots as photocatalysts for hydrogen production

Journal Article

A mini review: Shape memory polymers for biomedical applications

Kaojin Wang, Satu Strandman, X. X. Zhu

Journal Article

Multifunctional antimicrobial chlorhexidine polymers by remote plasma assisted vacuum deposition

Ana Mora-Boza, Francisco J. Aparicio, María Alcaire, Carmen López-Santos, Juan P. Espinós, Daniel Torres-Lagares, Ana Borrás, Angel Barranco

Journal Article

Photoinduced dichroism and surface-relief-gratings of hyperbranched azo polymers synthesized by azo-coupling

CHE Pengchao, HE Yaning, WANG Xiaogong

Journal Article

Tetrazole tethered polymers for alkaline anion exchange membranes

Erigene Bakangura, Yubin He, Xiaolin Ge, Yuan Zhu, Liang Wu, Jin Ran, Congliang Cheng, Kamana Emmanuel, Zhengjin Yang, Tongwen Xu

Journal Article

Synthesis and characterization of well-defined comb-like branched polymers

LI Aixiang, LU Zaijun, LÜ Zijian

Journal Article

Thermal degradation characteristics and products obtained after pyrolysis of specific polymers found

Evangelia C. Vouvoudi, Aristea T. Rousi, Dimitris S. Achilias

Journal Article

Surface molecularly imprinted polymers for solid-phase extraction of (--)-epigallocatechin gallate from

Yunling Gao,Ying Hu,Kejian Yao

Journal Article

Microbial biodegradation of plastics: Challenges, opportunities, and a critical perspective

Journal Article

The influence of curing conditions on the mechanical properties and leaching of inorganic polymers made

Remus I. Iacobescu, Valérie Cappuyns, Tinne Geens, Lubica Kriskova, Silviana Onisei, Peter T. Jones, Yiannis Pontikes

Journal Article

Material Mechanical Properties Necessary for the Structural Intervention of Concrete Structures

Tamon Ueda

Journal Article

Predictive calculations of gas solubility and permeability in glassy polymeric membranes: An overview

Matteo Minelli, Maria Grazia De Angelis, Giulio C. Sarti

Journal Article

Synthesis of poly(maleic acid alkylamide-

Jingjing XU, Jun XU, Jie SUN, Shili XING, Li LI, Xuhong GUO

Journal Article

Application of membrane separation technology in post-combustion carbon dioxide capture process

Mo LI,Xiaobin JIANG,Gaohong HE

Journal Article

Oilfield Chemical Additives in Drilling: Current Applications & Development Trend

Liu Rushan,Su Changming

Journal Article