Magnetic Catalyst KF/CaO–CoFe2O4 for the Preparation of Polycarbonate Diol (PCDL)

Hua, Ruimao; Li, He; Liu, Xiaoqin; Liu, Dinghua

doi:10.1007/s10904-019-01159-3

Cited by 4 publications

(2 citation statements)

References 37 publications

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“…The peak at 500°C could be ascribed to the adsorption of the O 2− sites, which implied the strong base strength. [ 27 ] Among the LDO‐M, the strong base sites only appeared when the LDO was cooperated with Ce, which demonstrated that the introduction of low electronegativity of the Ce induced a general enhancement of the negative charge of oxygen ions, [ 28 ] resulting in the increase of strong base sites.…”

Section: Resultsmentioning

confidence: 99%

Ce cooperated layered double oxide with enhanced base sites activity for the synthesis of polycarbonate diols

et al. 2022

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The development of highly efficient alkaline catalysts with abundant base sites is of paramount importance for the synthesis of polycarbonate diols (PCDLs). And the application of heterogeneous catalysts is an effective strategy to address the effect of residual catalysts on the quality of PCDLs. Here, Ce cooperated layered double oxide (LDO-Ce) was used as a catalyst for the preparation of PCDLs via transesterification between dimethyl carbonate (DMC) and 1,4-butanediol (BDO). CO 2 temperature-programmed desorption (CO 2 -TPD) profiles demonstrated that the introduction of Ce led to an increase in strong base sites of LDO-Ce, thus endowing LDO-Ce with excellent catalytic performance. Besides, LDO-Ce possessed satisfactory specific surface area and pore size. A possible catalytic mechanism was proposed to illustrate the transesterification process. The effects of the reaction conditions on the hydroxyl value, yield, and BDO conversion were further investigated in detail. The yield of PCDLs with a hydroxyl value of 112.2 mg KOH/g (corresponding to a number average molecular weight [M n ] of 1000 g/mol) was 92.44% under its optimum reaction conditions (w (catalyst) = 0.5%, n(DMC)/n(BDO) = 1.25, Ttransesterification = 130 C, ttransesterification = 5 h, Tpolycondensation = 170 C, tpolycondensation = 4 h, Ppolycondensation = 10 kPa). Moreover, LDO-Ce was easily removed after the transesterification process (Step 1), ensuring the quality of PCDLs, and it was recycled three times without significant loss of catalytic activity.

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Section: Resultsmentioning

confidence: 99%

Ce cooperated layered double oxide with enhanced base sites activity for the synthesis of polycarbonate diols

et al. 2022

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“…The synthetic scheme of PCDL was shown in Figure 1, which was obtained by the stepwise transesterification reaction 40 of BHE‐BPA with DPC. The BHE‐BPA (50.56 g, 160 mmol) and tetrabutyl titanate catalyst (0.38 g, 0.5 wt%) was put into a 250‐ml three‐necked round bottom flask equipped with a magnetic stirrer and a thermometer.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of novel polycarbonate‐based thermoplastic polyurethane elastomers compatibilizers with octadecyl side chains and their application in PC/PP blends

Liu

2021

Polymers for Advanced Techs

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With the aim to improve the compatibility of polycarbonate (PC)/polypropylene (PP) blends, a novel aromatic polycarbonate diol (PCDL) was synthesized by the transesterification reaction, then a series of polycarbonate‐based thermoplastic polyurethane elastomers compatibilizers (TPU‐Gx) with octadecyl side chains were successfully prepared by introducing different content of PCDL and glyceryl monostearate (2,3‐Dihydroxypropyl octadecenoate; GMS). The structures of synthesized products were confirmed by Fourier transform infrared spectroscopy and Nuclear magnetic resonance hydrogen spectroscopy. Thermogravimetry results showed that all TPU‐Gx had good thermal stability. The effects of TPU‐Gx on the compatibilization of PC/PP blends were investigated in the aspect of morphology, mechanical, thermal, and rheological properties. The results showed that all TPU‐Gx could enhance the interfacial adhesion between PC/PP and improve the mechanical properties of PC/PP blends. Among them, the addition of TPU‐G1.5 containing 6.0 wt% PCDL and 1.5 wt% GMS made PC/PP/TPU‐G1.5 blends show the highest impact strength, which increased by 54.1% when compared with that of pure PC/PP blends.

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Waste Chicken Eggshell-Derived CaO Based Magnetic Solid Base Catalysts for the One-Pot Synthesis of Tetrahydro-4H-chromenes and Benzopyranopyrimidines

Sharma

et al. 2023

Catal Lett

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Magnetic Catalyst KF/CaO–CoFe2O4 for the Preparation of Polycarbonate Diol (PCDL)

Cited by 4 publications

References 37 publications

Ce cooperated layered double oxide with enhanced base sites activity for the synthesis of polycarbonate diols

Ce cooperated layered double oxide with enhanced base sites activity for the synthesis of polycarbonate diols

Synthesis of novel polycarbonate‐based thermoplastic polyurethane elastomers compatibilizers with octadecyl side chains and their application in PC/PP blends

Waste Chicken Eggshell-Derived CaO Based Magnetic Solid Base Catalysts for the One-Pot Synthesis of Tetrahydro-4H-chromenes and Benzopyranopyrimidines

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