Glycerol citrate polyesters produced through heating without catalysis

Tisserat, Brent; O’Kuru, Rogers Harry; Hwang, Hong‐Sik; Mohamed, Abdellatif A.; Holser, Ronald A.

doi:10.1002/app.36669

Cited by 49 publications

(46 citation statements)

References 10 publications

(27 reference statements)

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“…[24] These indicated that both the cellulose and polyester were thermally stable polymers. [24] The highest value, 376 8C, indicated the formation of the cellulose-polyesterc omplex by esterification of available carboxylic groupso ft he prepared polyester with the alcohols in the cellulose. Composite cured for 4hgave three T p valueso f2 46, 3 19, and 376 8C.…”

Section: Resultsmentioning

confidence: 98%

“…[30] Thus, the concern regarding this composite is the glycerol citrate polyester.A sr eported by Tisserat et al,g lycerol citrate polyester is a highly stable polymer composed of ester bonds exhibiting almostn od egradation in water but significant deteriorationi n acid solutions (0.1-1.0 m HCl) and strong alkaline solutions (0.1-1.0 m NaOH) after soakingf or 72 h. [24] Even after 1-1.5 years of storageu nder dry conditions, this polyester does not show visual indications of degradation. Cellulose in nature is regarded to be physicochemically stable, owing to its high molecular mass, highly ordered crystalline structure, and insolubility in common solvents.…”

Section: Resultsmentioning

confidence: 99%

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Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester

2018

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A series of optically transparent composites were made by using tunicate cellulose membranes, in which the naturally organized cellulose microfibrillar network structure of tunicate tunics was preserved and used as the template and a solution of glycerol and citric acid at different molar ratios was used as the matrix. Polymerization through ester bond formation occurred at elevated temperatures without any catalyst, and water was released as the only byproduct. The obtained composites had a uniform and dense structure. Thus, the produced glycerol citrate polyester improved the transparency of the tunicate cellulose membrane while the cellulose membrane provided rigidity and strength to the prepared composite. The interaction between cellulose and polyester afforded the composites high thermal stability. Additionally, the composites were optically transparent and their shape, strength, and flexibility were adjustable by varying the formulation and reaction conditions. These composites of cellulose, glycerol, and citric acid are renewable and biocompatible and have many potential applications as structural materials in packaging, flexible displays, and solar cells.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester

2018

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“…It is mostly known as a material used in the food industry obtained by Soccol et al [24] and Vandenberghe et al [25] or as well as the detergent industry examined by Grewal and Karla [26] and Pandey at al. [27] and Tisserat et al [28]. It is not widely used in the chemistry of polymers, so far used to producing polyesters by Tisserat et al [28].…”

Section: Introductionmentioning

confidence: 99%

“…[27] and Tisserat et al [28]. It is not widely used in the chemistry of polymers, so far used to producing polyesters by Tisserat et al [28]. Citric acid is the cheapest carboxylic acid available on the market.…”

Section: Introductionmentioning

confidence: 99%

The use of citric acid in the production of polyols for rigid PUR-PIR foams

Liszkowska

2016

Polym. Bull.

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The article describes the method of obtaining new, cheaper compounds which can substitute polyols in the production of rigid polyurethane-polyisocyanurate foams (PUR-PIR). Rigid PUR-PIR foams were synthesized, using newly obtained tree compounds (citrates with hydroxyl groups): obtained with using catalyst (T-2-HHT ? K), without catalyst (T-2-HHT) and (T-5-HHT). New compounds (T-2-HHT ? K, T-2-HHT, T-5-HHT) were prepared from citric acid (1 mol) and glycols, respectively: butane-1.2-diol (3 mol and excess of 30 cm 3 ), butane-1.2-diol (3 mol), pentane-1.5-diol (3 mol) by the esterification reaction in the solution. The industrial Rocopol 551, used as polyol, was gradually substituted for the new compounds in the polyol premix in new foams. The three series of rigid polyurethane-polyisocyanurate foams based on T-2-HHT ? K, T-2-HHT, T-5-HHT have been synthesized (F1-F16) and W foam without new compound. Its properties have been determined according to the standards. It has been shown that the addition of T-2-HHT ? K, T-2-HHT, T-5-HHT to the foams affects the foams' density. The influence of the abovementioned compounds on foams' flammability, thermal properties and others was examined. A decrease in foams' brittleness by 6.9 % and in oxygen index by 24 % was observed. The examined retention was in the range of 80.9-96.5 %.

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“…CA is the most commonly used polyacid monomer for the production of polyesters by melt polycondensation. In this context, it has been copolymerised with various aliphatic diols, d ‐sorbitol and glycerol, amongst others. The polyester networks resulting from those reactions have found applications in, for example, tissue engineering and drug delivery …”

Section: Introductionmentioning

confidence: 99%

Thermal study of polyester networks based on renewable monomers citric acid and gluconolactone

et al. 2016

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A detailed thermal study is presented of the melt polycondensation between the renewable monomers citric acid and d‐glucono‐δ‐lactone. It was found that the polyester networks formed have glass transition temperature ranges that increase with increasing reaction temperature and time, corresponding to an increase in molecular weight. The minimum reaction temperature was investigated and found to be 130 °C for a 1/1 system. Moreover, the monomers show eutectic melt behaviour, with a eutectic melting temperature of 125 °C. A range of additional co‐monomers were evaluated, revealing that aliphatic and aromatic bifunctional co‐monomers result in lower glass transition temperatures. When polyfunctional co‐monomers were employed it was found that the chain flexibility influenced the resulting thermal properties. Moreover, it is shown that the ring structure of d‐glucono‐δ‐lactone plays a key role in the thermal properties of the resulting polyesters. © 2016 Society of Chemical Industry

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Glycerol citrate polyesters produced through heating without catalysis

Cited by 49 publications

References 10 publications

Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester

Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester

The use of citric acid in the production of polyols for rigid PUR-PIR foams

Thermal study of polyester networks based on renewable monomers citric acid and gluconolactone

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