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Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3,   Pages 450-456 doi: 10.1007/s11705-018-1735-6

Abstract: fabricated by hydrogen-bonding azobenzene derivatives (AzoR) to poly(4-vinyl pyridine) blocks of polystyrene-block-poly

Keywords： laser ablation     block copolymers     hydrogen-bond     azobenzene derivatives     supramolecular assembly    

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Preparation of polysulfone-based block copolymer ultrafiltration membranes by selective swelling and

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 745-754 doi: 10.1007/s11705-021-2038-x

Abstract: Selective swelling of block copolymers of polysulfone-b-poly(ethylene glycol) is an emerging strategySelective swelling was performed on the obtained block copolymer structures in the solvent pair of ethanolhydrochloric acid and the spaces initially occupied by CaCO3 provided extra pores to the block

Keywords： block copolymers     selective swelling     ultrafiltration     CaCO3 nanoparticles     sacrificial nanofillers    

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Block copolymers as efficient cathode interlayer materials for organic solar cells

Dingqin Hu, Jiehao Fu, Shanshan Chen, Jun Li, Qianguang Yang, Jie Gao, Hua Tang, Zhipeng Kan, Tainan Duan, Shirong Lu, Kuan Sun, Zeyun Xiao

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 3,   Pages 571-578 doi: 10.1007/s11705-020-2010-1

Abstract: Herein, we design block copolymers with well controlled chemical composition and molecular weight forThe block copolymer coated cathodes display high optical transmittance and low work function.Conductivity studies reveal that the block copolymer thin film has abundant conductive channels and excellentFurthermore, no post-treatment is needed which enables excellent processability of the block copolymer

Keywords： organic solar cell     block copolymer     cathode interlayer    

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Synthesis and thermosensitive behavior of dextran graft copolymers containing poly (N-vinylcaprolactam

SHI Huangying, CHEN Wenjuan, ZHANG Liming

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1,   Pages 72-75 doi: 10.1007/s11705-007-0015-7

Abstract: New graft copolymers were synthesized by grafting N-vinylcaprolactam onto dextran.By optical transmittance measurements, it was found that the aqueous solutions of these graft copolymers

Keywords： transmittance     copolymer concentration     LCST     temperature     elemental    

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Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0968-8

Abstract: ductility of their compression zones, the present study proposes using a precast confined concrete block

Keywords： ductility     four-point bending test     glass fiber-reinforced polymer     precast confined concrete block    

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Fluorene-based narrow-band-gap copolymers for red light-emitting diodes and bulk heterojunction photovoltaic

SUN Mingliang, WANG Li, XIA Yangjun, DU Bin, LIU Ransheng, CAO Yong

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 3,   Pages 257-264 doi: 10.1007/s11705-008-0052-x

Abstract: A series of narrow band-gap conjugated copolymers (PFO-DDQ) derived from 9,9-dioctylfluorene (DOF) andThe solutions and the thin solid films of the copolymers absorb light from 300–590 nm with two absorbance

Keywords： simulator     Efficient     band-gap     PFO-DDQ50     intensity    

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Thermoresponsive block copolymer supported Pt nanocatalysts for base-free aerobic oxidation of 5-hydroxymethyl

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 6,   Pages 1514-1523 doi: 10.1007/s11705-021-2092-4

Abstract: a thermoresponsive poly(acrylamide-co-acrylonitrile)-b-poly(N-vinylimidazole) blockThe imidazole groups in the block copolymer were conducive to the improvement of catalytic performance

Keywords： aerobic oxidation     base-free     5-hydroxymethyl-2-furfural     Pt nanoparticle     thermoresponsive block copolymer    

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Synthesis of copolymers of 3-acryloyloxymethyl-3′-methyloxetane and 3-(2-(2-(2-Methoxyethylenoxy)ethylenoxy

YE Lin, ZHAO Yumei, FENG Zengguo, BAI Ying, WU Feng

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 4,   Pages 343-348 doi: 10.1007/s11705-007-0062-0

Abstract: The resulting copolymers were characterized by FTIR, H NMR and Gel Permeation Chromatography (GPC) analyses, and it was found that the enchained ratio of AMO in the copolymers is far lower than its feed ratio

Keywords： 4-butanediol     2-methoxyethylenoxy     consistent     oxetane-derived     copolymer    

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Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 440-447 doi: 10.1007/s11705-017-1626-2

Abstract: Isothermal-isobaric molecular dynamics simulation was used to study the diffusion mechanism of water in polyurethane- -poly( -isopropyl acrylamide) (PU- -PNIPAm) with a hydrophobic PU/hydrophilic PNIPAm mass ratio of 1.4 to 1 at 298 K and 450 K. Here, the experimental glass transition temperature ( ) of PU is 243 K while that of PNIPAm is 383 K. Different amounts of water up to 15 wt-% were added to PU- -PNIPAm. We were able to reproduce the specific volumes and glass transition temperatures (250 K and 390 K) of PU- -PNIPAm. The computed self-diffusion coefficient of water increased exponentially with increasing water concentration at both temperatures (i.e., following the free volume model of Fujita). It suggested that water diffusion in PU- -PNIPAm depends only on its fractional free volume despite the free volume inhomogeneity. It is noted that at 298 K, PU is rubbery while PNIPAm is glassy. Regardless of temperature, radial distribution functions showed that water formed clusters with sizes in the range of 0.2–0.4 nm in PU- -PNIPAm. At low water concentrations, more clusters were found in the PU domain but at high water concentrations, more in the PNIPAm domain. It is believed that water molecules diffuse as clusters rather than as individual molecules.

Keywords： molecular dynamics simulation     amphiphilic block copolymer     free volume     water diffusivity     fujita model    

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Wear mechanism of disc-brake block material for new type of drilling rig

WANG Xinhua, WANG Simin, ZHANG Siwei, WANG Deguo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 10-16 doi: 10.1007/s11465-008-0009-2

Abstract: Topography and elementary components of the brake block’s wear surface are analyzed by employing SEMWhen the frictional temperature is lower, the surface film of the brake block is thinner, dense, smoothwear, the hard peaks from the friction surface of the disc-brake plough on the surface of the brake blockfriction heat, obvious softening and plastic flow can be found on the friction surface of the brake blockThermal decomposition of cohesive material in the brake block is simultaneously strengthened, so that

Keywords： asbestos-free frictional     Fracture     cyclization     friction     disc-brake    

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Fundamental and application of amphiphilic copolymers in high performance MF/UF membranes

Zhu Baoku,Cui Yue,Wang Jun,Wang Nachuan, Yao Zhikan,Zhu Liping

Strategic Study of CAE 2014, Volume 16, Issue 12,   Pages 87-93

Abstract: polymer microfiltration/ultrafiltration (MF/UF) membranes with lower production cost， the amphiphilic copolymersA series of amphiphilic copolymers with different compositions and sequence structures were synthesizedThe synthesized copolymers were blended into various membranes via phase inversion process.better compatibility between polymer base and hydrophobic components prevented the loss of amphiphilic copolymers

Keywords： amphiphilic copolymers     blend porous membrane     surface enrichment     hydrophilicity     anti-fouling    

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Spatial embedded reinforcement of 20-node block element for analysis PC bridges

LONG Peiheng, DU Xianting, CHEN Weizhen

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3,   Pages 274-280 doi: 10.1007/s11709-008-0039-1

Abstract: The formula for the contribution of prestressed reinforcement on embedded reinforcement element is derived according to the mechanical behavior of PC bridges and the foundational principle of finite element method. Mechanical concept is definite and examples validate the calculation results. Reinforcement element model allows generating a finite element mesh without taking into consideration the layout of reinforcements. Furthermore, the prestressing tendon may pass through the concrete elements in an arbitrary manner. It is an effective approach that the no-node loads are diverted from the tendons to the adjacent concrete elements. A useful arithmetic analysis of the spatial curved tendon PC Bridges is provided.

Keywords： arithmetic analysis     calculation     prestressed reinforcement     mechanical     arbitrary    

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A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic

Chao WU,Lu-ping XU,Hua ZHANG,Wen-bo ZHAO

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 9,   Pages 796-804 doi: 10.1631/FITEE.1500058

Abstract: The block accumulating semi-coherent integration of correlations (BASIC) is a state-of-the-art method, but calculating the inter-block conjugate products restricts BASIC in a low signal-to-noise ratio (We propose a block zero-padding method based on a discrete chirp-Fourier transform (DCFT) for parameterThe proposed method combines DCFT and block zero-padding.

Keywords： Threshold detection     Discrete chirp-Fourier transform     Block zero-padding     High dynamic     Weak L1 signal    

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Repression of CDKN2C caused by PML/RARα binding promotes the proliferation and differentiation block

Xiaoling Wang,Yun Tan,Yizhen Li,Jingming Li,Wen Jin,Kankan Wang

Frontiers of Medicine 2016, Volume 10, Issue 4,   Pages 420-429 doi: 10.1007/s11684-016-0478-3

Abstract: highlights the importance of CDKN2C inactivation in the abnormal cell cycle progression and differentiation block

Keywords： CDKN2C     acute promyelocytic leukemia     cell cycle arrest     differentiation    

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Analysis of A Block Cipher Based on Chaos

Jin Chenhui

Strategic Study of CAE 2001, Volume 3, Issue 6,   Pages 75-80

Abstract:

In this paper, it is pointed out that the block cipher proposed in “Design of Block Cipher substitution

Keywords： chaos sequence     block cipher     transposition cipher     attack with known plaintext     attack with ciphertext only    

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Title Author Date Type Operation

Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Journal Article

Preparation of polysulfone-based block copolymer ultrafiltration membranes by selective swelling and

Journal Article

Block copolymers as efficient cathode interlayer materials for organic solar cells

Dingqin Hu, Jiehao Fu, Shanshan Chen, Jun Li, Qianguang Yang, Jie Gao, Hua Tang, Zhipeng Kan, Tainan Duan, Shirong Lu, Kuan Sun, Zeyun Xiao

Journal Article

Synthesis and thermosensitive behavior of dextran graft copolymers containing poly (N-vinylcaprolactam

SHI Huangying, CHEN Wenjuan, ZHANG Liming

Journal Article

Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone

Journal Article

Fluorene-based narrow-band-gap copolymers for red light-emitting diodes and bulk heterojunction photovoltaic

SUN Mingliang, WANG Li, XIA Yangjun, DU Bin, LIU Ransheng, CAO Yong

Journal Article

Thermoresponsive block copolymer supported Pt nanocatalysts for base-free aerobic oxidation of 5-hydroxymethyl

Journal Article

Synthesis of copolymers of 3-acryloyloxymethyl-3′-methyloxetane and 3-(2-(2-(2-Methoxyethylenoxy)ethylenoxy

YE Lin, ZHAO Yumei, FENG Zengguo, BAI Ying, WU Feng

Journal Article

Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Journal Article

Wear mechanism of disc-brake block material for new type of drilling rig

WANG Xinhua, WANG Simin, ZHANG Siwei, WANG Deguo

Journal Article

Fundamental and application of amphiphilic copolymers in high performance MF/UF membranes

Zhu Baoku,Cui Yue,Wang Jun,Wang Nachuan, Yao Zhikan,Zhu Liping

Journal Article

Spatial embedded reinforcement of 20-node block element for analysis PC bridges

LONG Peiheng, DU Xianting, CHEN Weizhen

Journal Article

A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic

Chao WU,Lu-ping XU,Hua ZHANG,Wen-bo ZHAO

Journal Article

Repression of CDKN2C caused by PML/RARα binding promotes the proliferation and differentiation block

Xiaoling Wang,Yun Tan,Yizhen Li,Jingming Li,Wen Jin,Kankan Wang

Journal Article

Analysis of A Block Cipher Based on Chaos

Jin Chenhui

Journal Article