Upconverting nanocomposites dispersed in urea-containing acrylics

Inglefield, David L.; Merritt, Travis R.; Magill, Brenden A.; Long, Timothy Edward; Khodaparast, Giti A.

doi:10.1039/c5tc00992h

Cited by 7 publications

(10 citation statements)

References 37 publications

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“…Thermogravimetric analysis demonstrated one‐step thermal degradation for all the triblock copolymers, and the temperatures at 5 wt % weight loss ( T d,5% ) varied from 180 to 220 °C. The thermal degradation profile was consistent with earlier urea‐containing polymers . DSC highlighted two distinct T g s associated with the soft central and hard external blocks, respectively (Table ).…”

Section: Resultssupporting

confidence: 86%

“…2‐Isocyanatoethyl methacrylate (2‐ICMA) readily reacts with primary amines to give urea methacrylate monomers in quantitative yield. A modified procedure for the synthesis of urea methacrylate monomers is as follows: 1 equiv. of aniline 10 g (20 wt % in chloroform) was added to a 100‐mL, two‐necked, round‐bottomed flask equipped with a magnetic stir bar, and an addition funnel under nitrogen.…”

Section: Methodsmentioning

confidence: 99%

“…However, only a few studies address the synthesis and characterization of polymers with pendant urea sites using RAFT, and only Long et al . successfully synthesized block copolymers with pendant urea sites through RAFT polymerization …”

Section: Introductionmentioning

confidence: 99%

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Synthesis of urea‐containing ABA triblock copolymers: Influence of pendant hydrogen bonding on morphology and thermomechanical properties

Chen

Inglefield

Zhang

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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Reversible addition‐fragmentation chain transfer (RAFT) polymerization produced novel ABA triblock copolymers with associative urea sites within pendant groups in the external hard blocks. The ABA triblock copolymers served as models to study the influence of pendant hydrogen bonding on polymer physical properties and morphology. The triblock copolymers consisted of a soft central block of poly(di(ethylene glycol) methyl ether methacrylate) (polyDEGMEMA, 58 kg/mol) and hard copolymer external blocks of poly(2‐(3‐hexylureido)ethyl methacrylate‐co‐2‐(3‐phenylureido)ethyl methacrylate) (polyUrMA, 18‐116 kg/mol). Copolymerization of 2‐(3‐hexylureido)ethyl methacrylate (HUrMA) and 2‐(3‐phenylureido)ethyl methacrylate (PhUrMA) imparted tunable hard block Tg's from 69 to 134 °C. Tunable hard block Tg's afforded versatile thermomechanical properties for diverse applications. Dynamic mechanical analysis (DMA) of the triblock copolymers exhibited high modulus plateau regions (∼100 MPa) over a wide temperature range (−10 to 90 °C), which was indicative of microphase separation. Atomic force microscopy (AFM) confirmed surface microphase separation with various morphologies. Variable temperature FTIR (VT‐FTIR) revealed the presence of both monodentate and bidentate hydrogen bonding, and pendant hydrogen bonding remained as an ordered structure to higher than expected temperatures. This study presents a fundamental understanding of the influence of hydrogen bonding on polymer physical properties and reveals the response of pendant urea hydrogen bonding as a function of temperature as compared to main chain polyureas. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1844–1852

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Section: Resultssupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

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Synthesis of urea‐containing ABA triblock copolymers: Influence of pendant hydrogen bonding on morphology and thermomechanical properties

Chen

Inglefield

Zhang

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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“…And more significantly, the hydrophilic nanoparticles obtained by NOBF 4 treatment can readily undergo secondary surface modification due to the weak binding affinity of BF 4 − anions to the particle surface, allowing reversible phase transition. Regarding the application of UCNPs, this method tends to be widely accepted as a facile phase transfer process because of the ultrafast phase transfer speed, moderate reaction situation, and simple operation [ 5 , 12 , 29 , 33 , 34 ].…”

Section: Engineering Of Ucnps For Biomedical Applicationsmentioning

confidence: 99%

“…Two of the most important UCNP based drug delivery systems are (i) UCNP@porous silica core-shell structure [ 33 , 37 ] and (ii) drug conjugated or absorbed UCNPs. In the first method, drugs can be deposited in the pores of mesoporous silica shell coated onto UCNPs.…”

Section: Ucnps As Imaging Guidable Delivery Nanoplatformmentioning

confidence: 99%

Upconverting NIR Photons for Bioimaging

Liu

Zhang

et al. 2015

Nanomaterials

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Lanthanide-doped upconverting nanoparticles (UCNPs) possess unique anti-Stokes optical properties, in which low energy near-infrared (NIR) photons can be converted into high energy UV, visible, shorter NIR emission via multiphoton upconversion processes. Due to the rapid development of synthesis chemistry, lanthanide-doped UCNPs can be fabricated with narrow distribution and tunable multi-color optical properties. These unique attributes grant them unique NIR-driven imaging/drug delivery/therapeutic applications, especially in the cases of deep tissue environments. In this brief review, we introduce both the basic concepts of and recent progress with UCNPs in material engineering and theranostic applications in imaging, molecular delivery, and tumor therapeutics. The aim of this brief review is to address the most typical progress in basic mechanism, material design as bioimaging tools.

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Systematic studies on polyacrylates containing side‐chain hydrogen bonding units: Significant effects of the pendant functions on thermal behaviors and solubility of polymers

Hirose,

Yoshida,

Furusho

et al. 2024

Journal of Polymer Science

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The synthesis of polyacrylates containing various pendant hydrogen bonding or non‐hydrogen bonding functions and the effects of side‐chain functions on their physical properties are described. The polyacrylates possessing urea, urethane, N‐substituted urea, or carbonate groups are prepared by the free radical polymerization of acrylate monomers possessing the corresponding functional groups. The presence of stronger hydrogen bonding interactions both in bulk and solutions of a highly polar solvent such as dimethyl sulfoxide (DMSO) is supported by the infrared (IR) spectra, whereas the urethane‐based polyacrylate does not exhibit the interaction in the solution. The presence of the stronger hydrogen bonding interactions of the urea unit is discussed by the IR and nuclear magnetic resonance spectra and the density functional theory calculations of the corresponding model compounds. The solubility in organic solvents and the glass transition temperature (Tg) of polymers are also dependent on the structure of the pendant groups. Polar aprotic solvents such as DMSO can only dissolve the urea‐based polyacrylate, while the other polymers are soluble in a much wider range of solvents such as tetrahydrofuran. The urea‐based polyacrylate shows the highest Tg among the polymers studied owing to the presence of plural hydrogen bonding sites in the urea groups.

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Upconverting nanocomposites dispersed in urea-containing acrylics

Abstract: Lanthanide-doped upconverting nanoparticles (UCNPs) have the ability to convert low energy photons into high energy photons, making this material appealing for a variety of scientific pursuits, from solar energy conversion to bioimaging.

Cited by 7 publications

References 37 publications

Synthesis of urea‐containing ABA triblock copolymers: Influence of pendant hydrogen bonding on morphology and thermomechanical properties

Synthesis of urea‐containing ABA triblock copolymers: Influence of pendant hydrogen bonding on morphology and thermomechanical properties

Upconverting NIR Photons for Bioimaging

Systematic studies on polyacrylates containing side‐chain hydrogen bonding units: Significant effects of the pendant functions on thermal behaviors and solubility of polymers

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