New Materials Using Atom Transfer Radical Polymerization: Microcapsules Containing Polar Core Oil

Ali, Mir Mukkaram; Stöver, Harald D. H.

doi:10.1021/bk-2003-0854.ch021

Cited by 6 publications

(1 citation statement)

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“…Diphenyl ether (DPE) and xylene (XYL) provide a pair of aprotic solvents that differ significantly in their overall polarity (solubility parameters, δ XYL = 18.0 MPa 1/2 and δ DPE = 20.9 MPa 1/2 ; dielectric constants, ε XYL = 2.27; ε DPE = 3.73). Furthermore, we have previously shown that DPE and XYL are good solvents for ATRP of methyl methacrylate . Hence, the ATRP homopolymerization of PEGMA was first attempted in these two solvents.…”

Section: Resultsmentioning

confidence: 99%

Well-Defined Amphiphilic Thermosensitive Copolymers Based on Poly(ethylene glycol monomethacrylate) and Methyl Methacrylate Prepared by Atom Transfer Radical Polymerization

2004

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Amphiphilic homopolymers of the hydroxy-functional macromonomer poly(ethylene glycol) monomethacrylate (PEGMA) and its copolymers with methyl methacrylate (MMA) were prepared by atom transfer radical polymerization. Commercially available PEGMA (Aldrich) contains nonfunctional poly(ethylene glycol) (PEG), monofunctional PEGMA, and difunctional poly(ethylene glycol) dimethacrylate (PEGDMA) in a 1:3:1 ratio as analyzed by HPLC. A solvent extraction procedure yielded a PEGMA enriched mixture (PEG:PEG-MA:PEGDMA = 5:92:3) with PEGMA M n values of 480 and 410 Da based on HPLC and 1H NMR, respectively. ATRP homopolymerization of this purified PEGMA in the hydroxyl-bearing solvents, cyclohexanol and ethanol (ε = 16.4 and 25.3, respectively), yielded well-defined homopolymers (M w/M n < 1.1). On the other hand, ATRP copolymerizations with MMA (PEGMA content = 10, 18, 24, 30, and 40 mol %) yielded best results in non-hydrogen-bonding diphenyl ether (ε = 3.37). The homopolymer and copolymers containing more than 24 mol % (57 wt %) PEGMA were water-soluble and exhibited sharp lower critical solution temperatures (LCST) that increased with increasing PEGMA content as expected. Unlike similar PEGMA-based amphiphilic copolymers prepared by conventional free radical polymerizations, the ATR polymerizations reported here proceeded to high conversions (60−100%) and yielded well-defined polymers (M w/M n = 1.1−1.15) with no gel fraction that remained linear and water-soluble after storage in ambient conditions for several months.

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Section: Resultsmentioning

confidence: 99%

Well-Defined Amphiphilic Thermosensitive Copolymers Based on Poly(ethylene glycol monomethacrylate) and Methyl Methacrylate Prepared by Atom Transfer Radical Polymerization

2004

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Fundamentals of Atom Transfer Radical Polymerization

Golas

Mueller

Matyjaszewski

2007

Encyclopedia of Polymer Science and Technology

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The development of living polymerization enabled the production of polymers with precisely controlled molecular weight, narrow molecular weight distribution, and well‐defined architecture and composition. There are a number of advantages of controlled/living radical polymerization (CRP) as compared to ionic polymerization. Such advantages include applicability to a wide range of monomers and solvents, tolerance to impurities and functional groups, and ease of experimental set‐up. The most widely used CRP techniques include atom transfer radical polymerization (ATRP), nitroxide‐mediated polymerization, organometallic‐mediated radical polymerization, and degenerative transfer polymerization. In each case, control is maintained via fast dynamic equilibrium between dormant species and propagating chains. This article gives details on ATRP fundamentals, mechanistic considerations, conducting ATRP, materials, and functionality. Recent advances in catalyst design, initiation systems, and material synthesis have expanded the potential of ATRP as an environmentally benign process.

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Fluorescent Temperature Sensing Using Triarylboron Compounds and Microcapsules for Detection of a Wide Temperature Range on the Micro‐ and Macroscale

Jiao

Xiong

Wang

et al. 2012

Adv Funct Materials

130

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Fluorescent temperature sensing has received increasing interest in a wide range of fields, including fluid dynamics, micromechanics, and molecular cell biology. Here, a novel series of triarylboron compounds with significant thermosensitive hue transformation and high fluorescent quantum efficiency in wide temperature range is described. It is then demonstrated that fluorescent core/shell microcapsules based on one of the compounds exhibit outstanding temperature response. The microcapsules, dispersed in different liquid or solid media, can serve as highly robust, reliable, and sensitive fluorescent temperature sensors. The sensors are the first example containing a single organic luminophor with a self‐reference feature that can detect on the micro‐ and macroscale from −30 to 140 °C. This finding may open a new avenue to the development of novel fluorescent temperature sensors.

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New Materials Using Atom Transfer Radical Polymerization: Microcapsules Containing Polar Core Oil

Cited by 6 publications

References 0 publications

Well-Defined Amphiphilic Thermosensitive Copolymers Based on Poly(ethylene glycol monomethacrylate) and Methyl Methacrylate Prepared by Atom Transfer Radical Polymerization

Well-Defined Amphiphilic Thermosensitive Copolymers Based on Poly(ethylene glycol monomethacrylate) and Methyl Methacrylate Prepared by Atom Transfer Radical Polymerization

Fundamentals of Atom Transfer Radical Polymerization

Fluorescent Temperature Sensing Using Triarylboron Compounds and Microcapsules for Detection of a Wide Temperature Range on the Micro‐ and Macroscale

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