Facile Synthesis, Large Optical Nonlinearity, and Excellent Thermal Stability of Hyperbranched Poly(aryleneethynylene)s Containing Azobenzene Chromophores

Li, Zongjin; Qin, Anjun; Lam, Jacky W. Y.; Dong, Yuping; Dong, Yongqian; Ye, Cheng; Williams, Ian D.; Tang, Ben Zhong

doi:10.1021/ma051924f

Cited by 110 publications

(53 citation statements)

References 48 publications

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“…The chemical structure of the resultant products has been characterized by NMR and Raman spectroscopy. In Figure 2a, the 13 , respectively. But no signals of carbons in the nanotubes themselves are detected.…”

Section: Resultsmentioning

confidence: 99%

“…[12] Dendrimers and hyperbranched polymers (HBPs) have received much attention because of their unique physical and chemical properties. [13] Generally, HBPs are prepared by one-step polymerization in contrast to dendrimers prepared by multi-step reactions. So, HBPs are suitable for large-scale production and wide applications.…”

Section: Introductionmentioning

confidence: 99%

“…[17] To our knowledge, no information about hyperbranched poly(urea-urethane)-functionalized CNTs is available, although hyperbranched poly(urea-urethane)s [18] and linear polyurethane-functionalized CNTs [12b] have been reported. Here, the hyperbranched poly(urea-urethane)-functionalized multiwalled carbon nanotubes (MWNT-HPUs) are first synthesized by an easy one-pot method by polycondensation, and the resultant MWNT-HPUs are characterized by FT-IR, Raman, 1 H NMR, 13 C NMR, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements.…”

Section: Introductionmentioning

confidence: 99%

“…a)13 C NMR spectra of the neat HPU and MWNT-HPU in DMSO-d 6 . b) Raman spectra of MWNT, MWNT-COOH, MWNT-OH, and MWNT-HPU.…”

mentioning

confidence: 99%

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Multiwalled Carbon Nanotubes Functionalized by Hyperbranched Poly(urea‐urethane)s by a One‐Pot Polycondensation

Yang

Xie

et al. 2006

Macromol. Rapid Commun.

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Summary: Hyperbranched poly(urea‐urethane)‐functionalized multiwalled carbon nanotubes (MWNT‐HPUs) have been synthesized by a one‐pot polycondensation of tolylene 2,4‐diisocyanate and diethanolamine in the presence of MWNTs terminated with multiple hydroxy groups. FT‐IR, Raman, 1H NMR, and 13C NMR spectra reveal that the HPU trees are covalently grafted onto the MWNT surfaces. After a high density of HPU trees (83.5 wt.‐%) is attached to the MWNTs, core‐shell nanostructures with MWNTs as the core and the HPU trees as the shell are formed. A loose and uniform nanotube network can be observed by TEM, SEM, and AFM. The resulting MWNT‐HPUs are soluble in polar solvents such as dimethylformamide, dimethylacetamine, 1‐methyl‐2‐pyrrolidinone, and dimethyl sulfoxide.Hyperbranched poly(urea‐urethane)s functionalized multiwalled carbon nanotubes.imageHyperbranched poly(urea‐urethane)s functionalized multiwalled carbon nanotubes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…a)13 C NMR spectra of the neat HPU and MWNT-HPU in DMSO-d 6 . b) Raman spectra of MWNT, MWNT-COOH, MWNT-OH, and MWNT-HPU.…”

mentioning

confidence: 99%

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Multiwalled Carbon Nanotubes Functionalized by Hyperbranched Poly(urea‐urethane)s by a One‐Pot Polycondensation

Yang

Xie

et al. 2006

Macromol. Rapid Commun.

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“…The high tolerance of the cross-coupling reactions to a wide variety of functional groups also enabled us to synthesize functionalized hyperbranched polymers that contain nitro and azo moieties. [9] These previous successes in the polymer functionalization prompted us to explore the possibility of utilizing this coupling methodology for silole functionalization. We thus searched for stable yet reactive silole intermediates.…”

Section: Silole Functionalizationmentioning

confidence: 99%

Functionalized Siloles: Versatile Synthesis, Aggregation‐Induced Emission, and Sensory and Device Applications

Dong

Lam

et al. 2009

Adv Funct Materials

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316

155

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The synthesis of functionalized siloles has been a challenge because of the incompatibility of polar functional groups with the reactive intermediates in the conventional protocols for silole synthesis. In this work, a synthetic route for silole functionalization is elaborated, through which a series of functionalized siloles are successfully prepared. Whereas light emissions of traditional luminophores are often quenched by aggregation, most of the functionalized siloles show an exactly opposite phenomenon of aggregation‐induced emission (AIE). The siloles are nonemissive when dissolved in their good solvents but become highly luminescent when aggregated in their poor solvents or in the solid state. Manipulation of the aggregation–deaggregation processes of the siloles enables them to play two seemly antagonistic roles and work as both excellent quenchers and efficient emitters. The AIE effect endows the siloles with multifaceted functionalities, including fluorescence quenching, pH sensing, explosive detection, and biological probing. The sensing processes are very sensitive (with detection limit down to 0.1 ppm) and highly selective (with capability of discriminating among different kinds of ions, explosives, proteins, DNAs, and RNAs). The siloles also serve as active layers in the fabrication of electroluminescent devices and as photosensitive films in the generation of fluorescence patterns.

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Acetylenic Polymers

Liu¹,

Lam²,

Tang³

2011

Encyclopedia of Polymer Science and Technology

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The development of fundamental synthetic chemistry of acetylenic polymers, which not only refers to polyacetylenes but also to all the polymers synthesized from acetylenic monomers containing single or multiple carbon–carbon triple bonds, is summarized in this review. The design of new monomers with one, two, and three triple bonds, explorations of functional tolerant organic and organometallic catalysts, and development of effective linear and nonlinear triple bond‐based polymerization processes have led to successful syntheses of a large variety of acetylenic polymers with miscellaneous structures and advanced specialty properties.

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Facile Synthesis, Large Optical Nonlinearity, and Excellent Thermal Stability of Hyperbranched Poly(aryleneethynylene)s Containing Azobenzene Chromophores

Cited by 110 publications

References 48 publications

Multiwalled Carbon Nanotubes Functionalized by Hyperbranched Poly(urea‐urethane)s by a One‐Pot Polycondensation

Multiwalled Carbon Nanotubes Functionalized by Hyperbranched Poly(urea‐urethane)s by a One‐Pot Polycondensation

Functionalized Siloles: Versatile Synthesis, Aggregation‐Induced Emission, and Sensory and Device Applications

Acetylenic Polymers

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