Chen Wang

University of Utah

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Christopher N. Bowman

University of Colorado Boulder

Grant M. Musgrave

University of Utah

Weixian Xi

University of California, Los Angeles

Caleb J. Reese

University of Utah

Sudheendran Mavila

University of Colorado Boulder

Brady T. Worrell

University of Denver

Maciej Podgórski

Maria Curie-Skłodowska University

Matthew K. McBride

University of Colorado Boulder

George Fytas

Max Planck Institute for Polymer Research

Sankha Pattanayak

Indian Association for the Cultivation of Science

Cooperative Institutions

Chinese Academy of Sciences

University of Colorado Boulder

University of Utah

University of Colorado System

Beijing University of Chemical Technology

University of Chinese Academy of Sciences

University of Science and Technology of China

Tsinghua University

Peking University

Harbin Institute of Technology

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UV-Vis/FT-NIR in situ monitoring of visible-light induced polymerization of PEGDA hydrogels initiated by eosin/triethanolamine/O₂

PMC (2015)

Kaja Kaastrup Alan Aguirre‐Soto Chen Wang Christopher N. Bowman Jeffrey W. Stansbury

Triethanolamine

Eosin

Visible spectrum

Eosin Y

Source

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Citations (1)

Multi-view Graph Convolution for Participant Recommendation

arXiv (Cornell University) (2023)

Xiaolong Liu Liangwei Yang Chen Wang Mingdai Yang Zhiwei Liu

Social networks have become essential for people's lives. The proliferation of web services further expands social networks at an unprecedented scale, leading to immeasurable commercial value for online platforms. Recently, the group buying (GB) business mode is prevalent and also becoming more popular in E-commerce. GB explicitly forms groups of users with similar interests to secure better discounts from the merchants, often operating within social networks. It is a novel way to further unlock the commercial value by explicitly utilizing the online social network in E-commerce. Participant recommendation, a fundamental problem emerging together with GB, aims to find the participants for a launched group buying process with an initiator and a target item to increase the GB success rate. This paper proposes Multi-View Graph Convolution for Participant Recommendation (MVPRec) to tackle this problem. To differentiate the roles of users (Initiator/Participant) within the GB process, we explicitly reconstruct historical GB data into initiator-view and participant-view graphs. Together with the social graph, we obtain a multi-view user representation with graph encoders. Then MVPRec fuses the GB and social representation with an attention module to obtain the user representation and learns a matching score with the initiator's social friends via a multi-head attention mechanism. Social friends with the Top-k matching score are recommended for the corresponding GB process. Experiments on three datasets justify the effectiveness of MVPRec in the emerging participant recommendation problem.

Social graph

Representation

10.48550/arxiv.2311.12136

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Citations (0)

Photon correlation spectroscopic measurement of the bulk compliance of poly(vinyl acetate) above T g

Journal of Applied Physics (1985)

Chen Wang J.-U. Hagenah G. Meier George Fytas E. W. Fischer

The technique of determining the longitudinal compliance over a wide dynamic range (from 10−1 to 106 Hz) using Rayleigh–Brillouin scattering has been studied. The method of computing the longitudinal compliance spectrum from the time correlation of density fluctuations of poly(vinyl acetate), as determined by the photon correlation spectroscopic technique, is illustrated.

Vinyl acetate

Brillouin zone

10.1063/1.335835

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Citations (2)

The holographic investigation of diffusion of methyl red in poly(caprolactone) diol

The Journal of Chemical Physics (1988)

Jiliang Xia Chen Wang

The translational diffusion process of methyl red dissolved in poly(caprolactone) diol has been investigated as a function of temperature, using the laser induced holographic grating relaxation technique. The tracer diffusion coefficients of methyl red in trans and cis forms are found to follow the WLF type of temperature dependence with the WLF coefficients identical to that associated with the shear modulus of the polymer host. The cis isomer of methyl red although about 8% smaller in size diffuses about three times slower than the trans isomer. This is interpreted as due to a stronger interaction between the cis isomer and the polymer host.

Methyl red

Caprolactone

10.1063/1.454756

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Citations (20)

Pristine Polysulfone Networks as a Class of Polysulfide-Derived High-Performance Functional Materials

Chemistry of Materials (2016)

Maciej Podgórski Chen Wang Ye Yuan Danielle Konetski Ivan I. Smalyukh

Polysulfide network oxidative modification is presented. Fundamental differences between the properties of sufide-based and sulfone-based networks are discussed, and a method for producing the sulfone-based materials from thioether-based materials is developed. Oxidation enables significant mechanical property enhancements of polysulfide materials without any deleterious effects that typically accompany cross-linking polymerizations. Various application examples such as sulfide-containing particle modification and hardening of soft lithography or thiol–ene 3D microprinted objects are also shown.

Polysulfide

Polysulfone

Sulfone

Thioether

10.1021/acs.chemmater.6b02026

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Citations (36)

Quasielastic light scattering studies of dynamics of polystyrene in cyclo-hexane

Ferroelectrics (1980)

Walter Lempert Chen Wang

Abstract The dynamics of concentration fluctuations of polystyrene (M W = 20,000) in cyclohexane is studied as a function of temperature and concentration using the photon correlation spectroscopic technique. Over a 60°C temperature range the translational diffusion coefficient D C changes by more than two orders of magnitude. At a given temperature, D C first decreases with increasing concentration until a critical concentration C* at 22% is reached, beyond which D C increases with increasing concentration, reaching a maximum at higher concentration. The critical concentration C* is insensitive to temperature variations and can be estimated according to the equation for overlap concentration. The scattering intensity measurement as a function of concentration also shows a maximum at C*, suggesting that the slow down of concentration fluctuations due to the decrease in(∂u/∂c)P.T. is responsible for the intensity maximum. It is concluded that the emergence of the cooperative motion of the entangled network at C* is closely related to the effects of critical phenomena observed at the cloud point and the slow-down of translational diffusion.

Polystyrene

Intensity

Atmospheric temperature range

Critical point (mathematics)

10.1080/00150198008209499

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Citations (2)

Tribochemically Controlled Atom Transfer Radical Polymerization Enabled by Contact Electrification

Angewandte Chemie (2023)

Chen Wang Ruoqing Zhao Wenru Fan Lei Li Haoyang Feng

Abstract Traditional mechanochemically controlled reversible‐deactivation radical polymerization (RDRP) utilizes ultrasound or ball milling to regenerate activators, which induce side reactions because of the high‐energy and high‐frequency stimuli. Here, we propose a facile approach for tribochemically controlled atom transfer radical polymerization (tribo‐ATRP) that relies on contact‐electro‐catalysis (CEC) between titanium oxide (TiO 2 ) particles and CuBr 2 /tris(2‐pyridylmethylamine (TPMA), without any high‐energy input. Under the friction induced by stirring, the TiO 2 particles are electrified, continuously reducing CuBr 2 /TPMA into CuBr/TPMA, thereby conversing alkyl halides into active radicals to start ATRP. In addition, the effect of friction on the reaction was elucidated by theoretical simulation. The results indicated that increasing the frequency could reduce the energy barrier for the electron transfer from TiO 2 particles to CuBr 2 /TPMA. In this study, the design of tribo‐ATRP was successfully achieved, enabling CEC (ca. 10 Hz) access to a variety of polymers with predetermined molecular weights, low dispersity, and high chain‐end fidelity.

Atom-transfer radical-polymerization

Dispersity

Contact electrification

10.1002/ange.202309440

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Citations (3)

Radical mediated thiol-ene/yne dispersion polymerizations

Polymer (2016)

Farbod Alimohammadi Chen Wang Olivia Z. Durham Hannah R. Norton Christopher N. Bowman

Dispersion polymerization

Emulsion polymerization

Ene reaction

Step-growth polymerization

10.1016/j.polymer.2016.10.016

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Citations (19)

Preparation and properties of a novel waterborne fluorinated polyurethane–acrylate hybrid emulsion

Colloid & Polymer Science (2013)

Chen Wang Xiaorui Li Biao Du Peizhi Li Xiaojuan Lai

Shore durometer

Butyl acrylate

Emulsion polymerization

Zeta potential

10.1007/s00396-013-3107-6

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Citations (36)

Supramolecular self-assembly of a polyelectrolyte chain based on step-growth polymerization of hydrophobic and hydrophilic monomers

RSC Advances (2017)

Li Sun Shang Ma Chen Wang Yongmei Chi Jian Dong

Polymerization of citric acid and hexamethylene diisocyanate and hydrolysis results in a polyelectrolyte PHMC. Noncovalent cross-linking of cooperative H-bonding units stabilizes the self-assembly of the PHMC chains into nanoparticles in water.

Non-covalent interactions

10.1039/c7ra09205a

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Citations (4)