255727-66-3Relevant academic research and scientific papers
Multiphoton writing of three-dimensional fluidic channels within a porous matrix
Lee, Jyh-Tsung,George, Matthew C.,Moore, Jeffrey S.,Braun, Paul V.
, p. 11294 - 11295 (2009)
(Figure Presented) We demonstrate a facile method for fabricating novel 3D microfluidic channels by using two-photon-activated chemistry to locally switch the interior surface of a porous host from a hydrophobic state to a hydrophilic state. The 3D structures can be infilled selectively with water and/or hydrophobic oil with a minimum feature size of only a few micrometers. We envision that this approach may enable the fabrication of complex microfluidic structures that cannot be easily formed via current technologies.
Silica-diblock fluoropolymer hybrids synthesized by surface-initiated atom transfer radical polymerization
Huang, Hongpu,He, Ling
, p. 13108 - 13118 (2014)
Silica/diblock fluoropolymer hybrids SiO2-g-PMMA-b-P12FMA for coatings were synthesized by the silica surface-initiating atom transfer radical polymerization (SI-ATRP) of methylmethacrylate (MMA) and dodecafluoroheptyl methacrylate (12FMA). Silica surface initiator (SiO2-initiator) was obtained by 10-25 nm fumed silica particles grafted hydrosilylated undec-10-enyl, 2-bromo-2-methyl propionate with a density of 0.573 mmol g -1. The SI-ATRP approach in this paper displays the diagnostic criteria of controlled radical polymerization by the analysis of 1H NMR, 19F NMR and SEC-MALLS analysis, after comparing with the conventional initiator of ethyl 2-bromoisobutyrate (EBiB) for the E-PMMA-b-P12FMA diblock copolymer. Three mass ratios of SiO2- initiator/MMA/12FMA as 1/72.50/18.15, 1/72.50/45.38 and 1/181.26/18.15 were used to obtain the SiO2-g-PMMA-b-12FMA hybrids. The hybrids show 25-30 nm core-shell particles in CHCl3 solution composed of a P12FMA core and PMMA shell, but densely twined together as agglomerated particles. The PMMA-b-P12FMA shell grafted onto silica particles obviously increases the surface roughness of the film (50-500 nm), more than the E-PMMA-b-12FMA film (30 nm), and thereby contributes to the hydrophobic (112-118°) and oleophobic (45-78°) properties of the films. Increasing the P12FMA concentration (1/72.50/45.38) could result in stronger migration of the P12FMA segments onto the film surface, and therefore led to a lower surface free energy (10.97 mN m-1), increased advancing and receding for water contact angles (112° and 108°) and the highest cetane contact angles (74° and 70°), the lower water absorption and viscoelasticity, but a high thermostability at 420-450 °C. This journal is the Partner Organisations 2014.
Fabrication of unique chemical patterns and concentration gradients with visible light
Fors, Brett P.,Poelma, Justin E.,Menyo, Matthew S.,Robb, Maxwell J.,Spokoyny, Daniel M.,Kramer, John W.,Waite, J. Herbert,Hawker, Craig J.
, p. 14106 - 14109 (2013)
A modular and general method based on a photomediated ATRA reaction for the spatially controlled functionalization of surfaces with visible light is reported. The ability to control reactivity with light intensity combined with the orthogonality of ATRA chemistry allows well-defined chemically differentiated monolayers and complex nonlinear chemical concentration gradients to be easily prepared. Use of light to mediate these reactions permits spatial regulation and the generation of unique, multifunctional chemical gradients.
Simultaneous Preparation of Multiple Polymer Brushes under Ambient Conditions using Microliter Volumes
Narupai, Benjaporn,Page, Zachariah A.,Treat, Nicolas J.,McGrath, Alaina J.,Pester, Christian W.,Discekici, Emre H.,Dolinski, Neil D.,Meyers, Gregory F.,Read de Alaniz, Javier,Hawker, Craig J.
, p. 13433 - 13438 (2018)
The fabrication of well-defined, multifunctional polymer brushes under ambient conditions is described. This facile method uses light-mediated, metal-free atom-transfer radical polymerization (ATRP) to grow polymer brushes with only microliter volumes req
Fabrication of complex three-dimensional polymer brush nanostructures through light-mediated living radical polymerization
Poelma, Justin E.,Fors, Brett P.,Meyers, Gregory F.,Kramer, John W.,Hawker, Craig J.
, p. 6844 - 6848 (2013)
A facile approach to unique 3D, patterned polymer brushes is based on visible-light-mediated controlled radical polymerization. The temporal and spatial control of the polymerization allows the patterning of polymer brushes from a uniform initiating layer using a simple photomask (see picture). Furthermore, gradient polymer brushes, patterned block copolymers, and complex 3D structures can be obtained by modulating light intensity. Copyright
Silicon compound and method for producing same, and use thereof
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Page/Page column 15-17, (2016/09/26)
A novel silicon compound capable of initiating radical polymerization is provided. The silicon compound is represented by the following general formula (1) [in-line-formulae]A-Z1—S—Z2—Si(OR1)n(R2)3-n??(1)[/in-line-formulae] wherein A is a group capable of initiating radical polymerization, Z1 and Z2 are each independently a bivalent group that has at least a carbon atom, R1 and R2 are each independently an alkyl group having from 1 to 3 carbon atoms, and n is an integer of 1 to 3. A radical polymerization initiator comprising the silicon compound, and a polymer obtained by radical polymerization of a monomer with the radical polymerization initiator are also provided. Also provided is a complex having a polymer graft chain formed on a solid substance surface with the use of the silicon compound.
Composite electrolytes comprised of poly(ethylene oxide) and silica nanoparticles with grafted poly(ethylene oxide)-containing polymers
Jia, Zhe,Yuan, Wen,Zhao, Hui,Hu, Heyi,Baker, Gregory L.
, p. 41087 - 41098 (2015/02/19)
We designed, synthesized and characterized several novel hybrid inorganic/organic nanocomposite electrolytes that consist of poly(ethylene oxide) (PEO) based polymer grafted from silica nanoparticles. Poly(ethylene glycol)methyl ether methacrylate (PEGMA) was tailored on the silica surface through atom transfer radical polymerization (ATRP). A series of silica-polymers were synthesized with different lengths of PEO side chains. Electrolytes were prepared from the functionalized particles and low-molecular weight polyethylene glycol dimethyl ether (PEGDME) with the addition of LiI. Upon the introduction of particles, electrolytes became viscous and gel-like. With the increase of PEO side chains, the viscosity of the electrolytes increased dramatically, among which, silica-poly(PEGMA-1100) became solid-state. The room temperature conductivities of the hybrid silica-polymer electrolytes are in the range of 6 × 10-5to 1.2 × 10-4S cm-1. Silica-poly(PEGMA-475) and silica-poly(PEGMA-1100), with higher viscosity, exhibited better ionic conductivity. Surface-initiated copolymerization was also conducted to optimize the electrochemical performance of polymer coated silica nanoparticles. This journal is
Photocaged pendent thiol polymer brush surfaces for postpolymerization modifications via thiol-click chemistry
Hensarling, Ryan M.,Hoff, Emily A.,Leblanc, Arthur P.,Guo, Wei,Rahane, Santosh B.,Patton, Derek L.
, p. 1079 - 1090 (2013/03/29)
In this work, a postpolymerization surface modification approach is reported that provides pendent thiol functionality along the polymer brush backbone using the photolabile protection chemistry of both o-nitrobenzyl and p-methoxyphenacyl thioethers. Poly
