Hyperbranched polymers from A<sub>2</sub> + B<sub>3</sub> strategy: recent advances in description and control of fine topology

Chen, Heng; Kong, Jie

doi:10.1039/c6py00409a

Cited by 141 publications

(125 citation statements)

References 159 publications

(211 reference statements)

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“…Finally, the cross-linking reaction occurred among radicals of SBR chain. This cross-linking mechanism is in accord with G.L Marshall3637.…”

Section: Resultssupporting

confidence: 72%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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Sulfur (S) cross-linking styrene butadiene rubber (SBR) foams show high shrinkage due to the cure reversion, leading to reduced yield and increased processing cost. In this paper, double cross-linking system by S and dicumyl peroxide (DCP) was used to decrease the shrinkage of SBR foams. Most importantly, the synergy of double cross-linking agents was reported for the first time to our knowledge. The cell size and its distribution of SBR foams were investigated by FESEM images, which show the effect of DCP content on the cell structure of the SBR foams. The relationships between shrinkage and crystalline of SBR foams were analyzed by the synergy of double cross-linking agents, which were demonstrated by FTIR, Raman spectra, XRD, DSC and TGA. When the DCP content was 0.6 phr, the SBR foams exhibit excellent physical and mechanical properties such as low density (0.223 g/cm3), reduced shrinkage (2.25%) and compression set (10.96%), as well as elevated elongation at break (1.78 × 103%) and tear strength (54.63 N/mm). The results show that these properties are related to the double cross-linking system of SBR foams. Moreover, the double cross-linking SBR foams present high electromagnetic interference (EMI) shielding properties compared with the S cross-linking SBR foams.

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“…Finally, the cross-linking reaction occurred among radicals of SBR chain. This cross-linking mechanism is in accord with G.L Marshall3637.…”

Section: Resultssupporting

confidence: 72%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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“…Hyperbranched polymers (HBPs) are highly branched macromolecules, resembling dendrimers, with a 3D dendritic globular conformation . Both of HBPs and dendrimers have demonstrated several common characteristics when compared with linear ones, such as a high number of terminal functional groups, lower solution and melt viscosity, better solubility, and lack of chain entanglement.…”

Section: Introductionmentioning

confidence: 99%

Long‐Chain Hyperbranched Polymers: Synthesis, Properties, and Applications

Liu

Tian

2018

Macromol. Rapid Commun.

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By combining the virtues of conventional linear and hyperbranched polymers, long‐chain hyperbranched polymers (LCHBPs) have attracted great attention. Therefore, a comprehensive summary of the research progress of LCHBPs is presented, with a particular focus on their synthetic strategies, unique properties, and potential applications. The synthetic methodologies are rationalized into four main classes according to their construction process or mechanism, namely ABx (x ≥ 2), A2 + Bx (x ≥ 3), AB + ABx (x ≥ 2), and self‐condensing vinyl polymerization. Some of their rheological properties, self‐assembly behavior, and stimuli‐response features are then discussed. Finally, the emergent applications including biomedicine, electrical conductivity, chemical sensing, and catalyst carrier, are outlined. It is anticipated that this review will stimulate more inspiration for advancing the development of this novel kind of LCHBP.

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“…A small amount of weight loss was observed and the dehydrocoupling of Si–H/Si–H or Si–H/–NH– groups were detected (Fig. 3a) at temperature below 230 °C44. In addition, transamination processes between Co–NH and Si–N and the decomposition of methane and amido fragments occurred during the polymerization to form the Si–N–Co linkage.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis, microstructure and photophysical properties of core-shell nanostructured (SiCN)/BN nanocomposites

Zhang

Jia

Yang

et al. 2017

Sci Rep

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Increasing structural complexity at nanoscale can permit superior control over photophysical properties in the precursor-derived semiconductors. We demonstrate here the synthesis of silicon carbonitride (SiCN)/boron nitride (BN) nanocomposites via a polymer precursor route wherein the cobalt polyamine complexes used as the catalyst, exhibiting novel composite structures and photophysical properties. High Resolution Transmission Electron Microscopy (HRTEM) analysis shows that the diameters of SiCN−BN core−shell nanocomposites and BN shells are 50‒400 nm and 5‒25 nm, respectively. BN nanosheets (BNNSs) are also observed with an average sheet size of 5‒15 nm. The photophysical properties of these nanocomposites are characterized using the UV-Vis and photoluminescence (PL) analyses. The as-produced composites have emission behavior including an emission lifetime of 2.5 ns (±20 ps) longer observed in BN doped SiCN than that seen for SiC nanoparticles. Our results suggest that the SiCN/BN nanocomposites act as semiconductor displaying superior width photoluminescence at wavelengths spanning the visible to near-infrared (NIR) spectral range (400‒700 nm), owing to the heterojunction of the interface between the SiC(N) nanowire core and the BN nanosheet shell.

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Hyperbranched polymers from A₂ + B₃ strategy: recent advances in description and control of fine topology

Abstract: Recent advances in the fine topology regulation of hyperbranched polymers from an A2 + B3 strategy were presented from the perspectives of topology description and architecture control.

Cited by 141 publications

References 159 publications

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Long‐Chain Hyperbranched Polymers: Synthesis, Properties, and Applications

Facile synthesis, microstructure and photophysical properties of core-shell nanostructured (SiCN)/BN nanocomposites

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Hyperbranched polymers from A2 + B3 strategy: recent advances in description and control of fine topology

Abstract: Recent advances in the fine topology regulation of hyperbranched polymers from an A2 + B3 strategy were presented from the perspectives of topology description and architecture control.

Cited by 141 publications

References 159 publications

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Long‐Chain Hyperbranched Polymers: Synthesis, Properties, and Applications

Facile synthesis, microstructure and photophysical properties of core-shell nanostructured (SiCN)/BN nanocomposites

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Product

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Hyperbranched polymers from A₂ + B₃ strategy: recent advances in description and control of fine topology