Polymorphic Transformations of Cellulose Acetates Prepared by Solution Acetylation at an Elevated Temperature

Tang, Lie‐Gui; Hon, David N.‐S.; Zhu, Yayun

doi:10.1080/10601329608010863

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…The melting behavior of CDA confirms complex transitions with a broad melting peak spread over the range 210-250 °C, with two different endothermic peaks at about 210 °C and 230 °C, consistently with literature data [62]. CTA exhibits a sharp melting peak centered at 288-290 °C and an exothermic peak related to cold crystallization at 211-213 °C observed in the heating scan, confirming literature data [25].…”

Section: Calorimetric Tests and Determination Of Crystallinitysupporting

confidence: 89%

Towards a systematic determination of multicomponent gas separation with membranes: the case of CO2/CH4 in cellulose acetates

Ricci

Maio

Esposti

et al. 2021

Journal of Membrane Science

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Section: Calorimetric Tests and Determination Of Crystallinitysupporting

confidence: 89%

Towards a systematic determination of multicomponent gas separation with membranes: the case of CO2/CH4 in cellulose acetates

Ricci

Maio

Esposti

et al. 2021

Journal of Membrane Science

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“…All sample groups showed a minor endotherm at 283.3-291.2°C. The endothermic peak in this location was attributed to the melting temperature by Saka and Ohmae (1996), Tang et al (1996) and Cerqueira et al (2009), whereas others attributed it to carbohydrate breakdown (Barud et al, 2008;Meireles et al, 2010). The crystallinity ratios of the samples, in Table 2, represent that the melting temperature could be associated with the region.…”

Section: Dscmentioning

confidence: 92%

Selülozun TBAF/DMSO Çözücü Sisteminde KH2PO4 ve Na2HPO4 Tuz Karışımı Yerine Transesterifikasyonunda Katalizör Olarak Potasyum Karbonat

ERİŞİR,

GÜMÜŞKAYA

2023

Kastamonu Üniversitesi Orman Fakültesi Dergisi

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Aim of study: This study's goal is to evaluate potassium carbonate as a catalyst for the transesterification of cellulose dissolved in TBAF/DMSO and to identify the optimal reaction conditions. Material and methods: First, a solvent system consisting of 33 g TBAF and 165 g DMSO was prepared for 10 g dissolving pulp in this solvent system for one hour, then the cellulose solution was generated. The catalysts were added to the solution. At reaction temperature, vinyl acetate was added to the solution and the 70-h transesterification process was started. The product was precipitated in ethyl alcohol and washed with water on a sieve, and then dried at room temperature. The effects of changes in catalyst ratio and temperature on bond acetyl groups were investigated by heterogeneous saponification method, FTIR, XRD, DSC, viscosity and solubility test. Main results: The samples' DS values ranged from 1.39 to 2.37 and using phosphate salt mixture catalyst and increasing the ratio of catalyst increased the DS. FTIR and XRD data revealed that acetylation was effective. DSC thermograms showed a minor endotherm at 283.3-291.2°C, and it was identified as the melting point. With potassium carbonate, the viscosity and the solubility of the products increased. Highlights: Cellulose in TBAF/DMSO could be acetylated using potassium carbonate as the catalyst. Potassium carbonate's catalyst activity was weak on DS.

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Impacts of ions on the plasticization of cellulose triacetate by fluorinated ionic liquids: Thermal properties, microscopy, Raman spectra, and sorption of pure enantiomers

Hovorka,

Hrdlička,

Jeništová

et al. 2024

Polymer

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Polymorphic Transformations of Cellulose Acetates Prepared by Solution Acetylation at an Elevated Temperature

Cited by 7 publications

References 6 publications

Towards a systematic determination of multicomponent gas separation with membranes: the case of CO2/CH4 in cellulose acetates

Towards a systematic determination of multicomponent gas separation with membranes: the case of CO2/CH4 in cellulose acetates

Selülozun TBAF/DMSO Çözücü Sisteminde KH2PO4 ve Na2HPO4 Tuz Karışımı Yerine Transesterifikasyonunda Katalizör Olarak Potasyum Karbonat

Impacts of ions on the plasticization of cellulose triacetate by fluorinated ionic liquids: Thermal properties, microscopy, Raman spectra, and sorption of pure enantiomers

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