Polyvinylpolypyrrolidone Supported Brønsted Acidic Catalyst for Esterification

Wang, Song; Tian, Chengcheng

doi:10.1155/2016/8104838

Cited by 9 publications

(2 citation statements)

References 26 publications

(29 reference statements)

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“…After the reaction was completed, the product was investigated by gas chromatography (Agilent GC-7890A) using a Thermo TG-SQC capillary column (15 m × 0.25 mm × 0.25 μm), which equipped with a flame ionization detector (FID). Acid value was determined by titration according to the procedures described in the literature [29]. Citric acid conversion and the TBC yield were calculated using the following equations [9]:…”

Section: Esterification Of Citric Acid With N-butanol and Analysismentioning

confidence: 99%

“…Polyvinylpolypyrrolidone (PVPP), a commercialized cross-linked polymer adsorbent, has been used as a polymer support since it has many advantages, including being nontoxic, high adsorption capacity, and being insoluble in all types of solvents [25,26]. Moreover, it has been demonstrated that PVPP-supported catalysts have high catalytic ability and reusability in organic reactions [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Process Variables in the Synthesis of Tributyl Citrate Using a Polyvinylpolypyrrolidone-Supported Brønsted Acidic Ionic Liquid Catalyst

Wang

et al. 2018

International Journal of Polymer Science

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A polyvinylpolypyrrolidone-(PVPP-) supported Brønsted acidic ionic liquid catalyst ([BsPVPP]HSO 4 ) was synthesized by the reaction between SO 3 H-functionalized PVPP and H 2 SO 4 . The prepared catalyst was characterized by IR, XRD, FESEM, TG, and DSC. The catalytic activity of [BsPVPP]HSO 4 in the preparation of tributyl citrate (TBC) by the esterification reaction between citric acid and n-butanol was investigated. Response surface methodology (RSM) was applied to optimize the process variables of the esterification reaction. The variables, including the reaction time, the n-butanol-to-citric acid mole ratio, the reaction temperature, and the catalyst amount, were optimized by a Box-Behnken design. Under optimized conditions, with a n-butanolto-citric acid mole ratio of 5.2 : 1 and a reaction temperature of 120°C, the TBC yield reached 92.9% within 5.5 h in the presence of 6.6 wt% of catalyst; this result is in good agreement with the values predicted by the mathematical model. Moreover, the catalyst could be recycled four times with high catalytic activity.

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Section: Esterification Of Citric Acid With N-butanol and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of Process Variables in the Synthesis of Tributyl Citrate Using a Polyvinylpolypyrrolidone-Supported Brønsted Acidic Ionic Liquid Catalyst

Wang

et al. 2018

International Journal of Polymer Science

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Stimuli‐Responsive Nanostructured Surfaces for Biomedical Applications

Gomes

Mendes

2018

Functional Organic and Hybrid Nanostructured Materials

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Thermo- and pH-responsive cotton gauzes as drug delivery system obtained by gamma radiation and chemical initiator

Romero-Fierro,

Esquivel-Lozano,

Camacho-Cruz

et al. 2023

Cellulose

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The grafting of stimuli-responsive polymers into medical devices to create functional materials has attracted the attention of scientific community. The capacity of these polymers to change its conformation reversibly as function of variables of the environment in which it is applied, is well taken into account to create drug delivery systems. Because cotton gauzes are materials of priority use in biomedical area, and they are susceptible to develop biofilm on its surface contaminating skin wounds. This work proposes the modification of cotton gauze with a dual stimuli-responsive copolymer, composed of two monomers such as methacrylic acid and N-isopropylacrylamide, through a grafting copolymerization induced by chemical initiator and gamma radiation. Experimental conditions were evaluated for each method. Grafting was verified by infrared spectroscopy (FTIR-ATR) and scanning electron microscopy as well as its thermal behavior was determined through thermogravimetric analysis. Critical pH was confirmed by potentiometric titrations finding a value of 4.7 for grafted cotton gauzes and their critical temperature ranging between 31 and 34 °C, which was determined by water uptake as function of temperature. The loading and release of norfloxacin were tested, finding that grafted gauzes exhibited affinity for this drug and it is released under simulated physiological conditions of temperature and pH. Norfloxacin-loaded gauzes show their efficiency inhibiting Escherichia coli and Staphylococcus aureus growth in a contaminated environment, at different pH values. This improvement of cotton gauzes can serve as barrier to avoid the formation of biofilm in surgical conditions and for wound healing.

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Polyvinylpolypyrrolidone Supported Brønsted Acidic Catalyst for Esterification

Cited by 9 publications

References 26 publications

Optimization of Process Variables in the Synthesis of Tributyl Citrate Using a Polyvinylpolypyrrolidone-Supported Brønsted Acidic Ionic Liquid Catalyst

Optimization of Process Variables in the Synthesis of Tributyl Citrate Using a Polyvinylpolypyrrolidone-Supported Brønsted Acidic Ionic Liquid Catalyst

Stimuli‐Responsive Nanostructured Surfaces for Biomedical Applications

Thermo- and pH-responsive cotton gauzes as drug delivery system obtained by gamma radiation and chemical initiator

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