Reduction-cleavable hyperbranched polymers with limited intramolecular cyclization via click chemistry

2015 ◽  
Vol 53 (20) ◽  
pp. 2374-2380 ◽  
Author(s):  
Heng Chen ◽  
Jiqiong Jia ◽  
Xiao Duan ◽  
Zhen Yang ◽  
Jie Kong
Keyword(s):  
Click Chemistry ◽  
Intramolecular Cyclization ◽  
Hyperbranched Polymers

scholarly journals Grafting Hyperbranched Polymers onto TiO2 Nanoparticles via Thiol-yne Click Chemistry and Its Effect on the Mechanical, Thermal and Surface Properties of Polyurethane Coating

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2817 ◽  
Author(s):  
Feng Zhan ◽  
Lei Xiong ◽  
Fang Liu ◽  
Chenying Li
Keyword(s):  
Click Chemistry ◽  
Tio2 Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Hyperbranched Polymers ◽  
Nanocomposite Coatings ◽  
Mechanical And Thermal Properties ◽  
Nanoparticle Dispersion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Modified

In this study, we proposed a novel and facile method to modify the surface of TiO2 nanoparticles and investigated the influence of the surface-modified TiO2 nanoparticles as an additive in a polyurethane (PU) coating. The hyperbranched polymers (HBP) were grafted on the surface of TiO2 nanoparticles via the thiol-yne click chemistry to reduce the aggregation of nanoparticles and increase the interaction between TiO2 and polymer matrices. The grafting of HBP on the TiO2 nanoparticles surface was investigated by means of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR) and thermogravimetry analysis (TGA). The thermal and mechanical properties of nanocomposite coatings containing various amounts of TiO2 nanoparticles were measured by dynamic mechanical thermal (DMTA) and tensile strength measurement. Moreover, the surface structure and properties of the newly prepared nanocomposite coatings were examined. The experimental results demonstrate that the incorporation of the surface-modified TiO2 nanoparticles can improve the mechanical and thermal properties of nanocomposite coatings. The results also reveal that the surface modification of TiO2 with the HBP chains improves the nanoparticle dispersion, and the coating surface shows a lotus leaf-like microstructure. Thus, the functional nanocomposite coatings exhibit superhydrophobic properties, good photocatalytic depollution performance, and high stripping resistance.

Site-Specific Functionalization of Hyperbranched Polymers Using “Click” Chemistry

2009 ◽  
Vol 42 (12) ◽  
pp. 4028-4037 ◽  
Author(s):  
Animesh Saha ◽  
S. Ramakrishnan
Keyword(s):  
Click Chemistry ◽  
Hyperbranched Polymers ◽  
Site Specific

Intramolecular cyclization of long-chain hyperbranched polymers (HyperMacs) from A2 + Bn step-wise polymerization

2016 ◽  
Vol 7 (29) ◽  
pp. 4717-4727 ◽  
Author(s):  
Qingfu Ban ◽  
Jie Kong
Keyword(s):  
Intramolecular Cyclization ◽  
Topological Analysis ◽  
Hyperbranched Polymers ◽  
Long Chain

We presented a precise topological analysis on intramolecular cyclization for long-chain hyperbranched polymers via the new parameter of the macro-cyclic index (m-CI).

Combining Thio−Bromo “Click” Chemistry and RAFT Polymerization: A Powerful Tool for Preparing Functionalized Multiblock and Hyperbranched Polymers

2010 ◽  
Vol 43 (1) ◽  
pp. 20-24 ◽  
Author(s):  
Jiangtao Xu ◽  
Lei Tao ◽  
Cyrille Boyer ◽  
Andrew B. Lowe ◽  
Thomas P. Davis
Keyword(s):  
Click Chemistry ◽  
Raft Polymerization ◽  
Hyperbranched Polymers

Click Chemistry Expedited Radiosynthesis: Sulfur [18F]fluoride Exchange of Aryl Fluorosulfates

2019 ◽  
Author(s):  
Qinheng Zheng ◽  
Hongtao Xu ◽  
Hua Wang ◽  
Wen-Ge Han Du ◽  
Nan Wang ◽  
...  
Keyword(s):  
Click Chemistry ◽  
High Performance ◽  
Isotopic Exchange ◽  
Tumor Imaging ◽  
Radiochemical Yield ◽  
Exchange Method ◽  
Molar Activity ◽  
Positron Emission ◽  
Sulfur Fluoride

The lack of simple, efficient [<sup>18</sup>F]fluorination processes and new target-specific organofluorine probes remains the major challenge of fluorine-18-based positron emission tomography (PET). We report here a fast isotopic exchange method for the radiosynthesis of aryl [<sup>18</sup>F]fluorosulfate based PET agents enabled by the emerging sulfur fluoride exchange (SuFEx) click chemistry. The method has been applied to the fully-automated <sup>18</sup>F-radiolabeling of twenty-five structurally diverse aryl fluorosulfates with excellent radiochemical yield (83–100%) and high molar activity (up to 281 GBq µmol<sup>–1</sup>) at room temperature in 30 seconds. The purification of radiotracers requires no time-consuming high-performance liquid chromatography (HPLC), but rather a simple cartridge filtration. The utility of aryl [<sup>18</sup>F]fluorosulfate is demonstrated by the <i>in vivo</i> tumor imaging by targeting poly(ADP-ribose) polymerase 1 (PARP1).

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