Thermal degradation kinetics of polyketone based on styrene and carbon monoxide

Mu, Jiali; Fan, Wenjun; Shan, Shaoyun; Su, Hongying; Wu, Shuisheng; Jia, Qingming

doi:10.1016/j.tca.2014.01.013

Cited by 10 publications

(6 citation statements)

References 32 publications

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“…The copolymerization products are real polyketone polymers without homopolystyrene. 1 H NMR spectroscopies (Figure and Figure S38) of copolymerization products showed that no characteristic signals of the methylene on consecutive styrene unit were observed at 1.8–1.2 ppm, indicating that all these α-diimine palladium catalysts 1 – 5 realized perfectly alternating CO/styrene copolymerization. ,, …”

Section: Resultsmentioning

confidence: 98%

“…1 H NMR spectroscopies (Figure 7 and Figure S38) of copolymerization products showed that no characteristic signals of the methylene on consecutive styrene unit were observed at 1.8−1.2 ppm, indicating that all these α-diimine palladium catalysts 1−5 realized perfectly alternating CO/styrene copolymerization. 34,64,65 The stereochemistry of the CO/styrene copolymers was further characterized by 13 C NMR spectroscopy recording the spectra in a mixture solution of 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) and CDCl 3 . Figure 9 showed the ipsocarbon region (137−135 ppm) on 13 C NMR spectra of the CO/styrene copolymers, and the microtacticity was determined by integration of the signals assigned to the ipso-carbon atom.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Enhancement on Alternating Copolymerization of Carbon Monoxide and Styrene by Dibenzobarrelene-Based α-Diimine Palladium Catalysts

et al. 2018

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CO/styrene copolymerization by α-diimine palladium catalysts is a promising method for direct synthesis of polyketones. The effect of the catalyst backbone structure on CO/styrene copolymerization has been studied with the aim of developing robust α-diimine palladium catalysts able to improve the polymerization productivity and controllability. Dibenzobarrelene derived α-diimine palladium catalysts without o-aryl substituents were designed and synthesized for CO/styrene alternating copolymerization. Introduction of the rigid and bulky dibenzobarrelene backbone enhanced the thermal stability and the productivity of palladium catalyst. The dibenzobarrelene ligand backbone also improved the polymerization controllability, and living CO/styrene copolymerizations were achieved at 15 °C using α-diimine palladium catalysts in CH 2 Cl 2 . The steric hindrance of backbone and the π−π stacking between the dibenzobarrelene backbone and the aniline played crucial roles in stereocontrol and productivity.

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Section: Resultsmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

Enhancement on Alternating Copolymerization of Carbon Monoxide and Styrene by Dibenzobarrelene-Based α-Diimine Palladium Catalysts

et al. 2018

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“…, were used to investigate the thermal stability of porous PANI. There were four stages of weight loss in TGA curves: water loss (<140 °C); thermal decomposition of the dopant (140–300 °C); thermal decomposition of the polymer chains and dopant (300–500 °C); and decomposition of PANI (>500 °C) . The corresponding DTG curves of porous and nonporous PANI are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical porous polyaniline supercapacitor electrode from polyaniline/silica self‐ aggregates

Zhang²,

Xu³

et al. 2018

Polymer International

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To lengthen the lifecycles of polyaniline (PANI) electrodes, a hierarchical porous PANI was synthesized from PANI/silica self‐aggregates through a facile one‐pot method. Hydrogen bonding between NH groups in aniline/PANI and OH groups in nanosilica template led to a type of self‐assembly, which enabled the formation of uniform nanoparticles. Silica self‐aggregates provided macroporous channels, resulting in a decreased diffusion distance. After removal of the hard template, the porous PANI had a large, porous surface area (55.89 m2 g−1), in comparison with nonporous PANI (12.45 m2 g−1). The porous PANI was analyzed using Fourier transform infrared and UV‐visible spectroscopies, scanning electron microscopy, thermogravimetric analysis, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge–discharge measurements. Because of its hierarchical structure, the resultant porous PANI possessed a higher capacitance (397 F g−1) than nonporous PANI (280 F g−1) at 1 A g−1 in 1 mol L−1 H2SO4 electrolyte. © 2018 Society of Chemical Industry

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“…The decomposition kinetics of aliphatic polyketones based on styrene and carbon monoxide was detailed investigated by Jia's group. 15 The E k values estimated via Flynn–Wall–Ozawa method and Kissinger method were found to be in the range from 270.72 to 297.55 kJ mol −1 . The degradation kinetics of wholly aromatic polyketone was not systematically studied yet due to the difficulty to obtain the polymer.…”

Section: Introductionmentioning

confidence: 94%