Kinetic study of polyurethane synthesis using different catalytic systems of Fe, Cu, Sn, and Cr

Lima, Viviane de Almeida; Pelissoli, Nicole da Silva; Dullius, Jeane; Ligabue, Rosane Angélica; Einloft, Sandra

doi:10.1002/app.31298

Cited by 38 publications

(34 citation statements)

References 47 publications

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“…As it can be seen the molecular weight presents a tendency to increase with the increase of the filler content. This behavior probably is due to the presence of the iron (III), which is a well-known catalyst for polyurethane reaction formation [23]. The time of 30 min and temperature of 45°C during the nanocomposite preparation through physical mixture must be the responsible for new bond formation and the increase of the molecular weight.…”

Section: Molecular Weight Analysismentioning

confidence: 99%

New magnetic nanocomposites: Polyurethane/ Fe3O4-synthetic talc

Santos

Ligabue

Dumas

et al. 2015

European Polymer Journal

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Section: Molecular Weight Analysismentioning

confidence: 99%

New magnetic nanocomposites: Polyurethane/ Fe3O4-synthetic talc

Santos

Ligabue

Dumas

et al. 2015

European Polymer Journal

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“…Traditionally, the kinetics of polyurethane formation was extensively monitored by two direct methods that measure the concentration of reactant or reaction products: standard dibutylamine back titration and FTIR spectroscopy [14][15][16]. Back-titration is a well-known method for conventionally titrating for free isocyanate content; however, it is both time and chemical consuming.…”

Section: Polymerization Kineticsmentioning

confidence: 99%

Development of bio-based thermoplastic polyurethanes formulations using corn-derived chain extender for reactive rotational molding

Rashmi¹,

Rusu²,

Prashantha³

et al. 2013

Express Polym. Lett.

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Abstract. Partly bio-based segmented thermoplastic polyurethane (TPU) formulations were developed to fulfill the requirements of the reactive rotational molding process. They were obtained by one-shot bulk polymerization between an aliphatic diisocyanate (1,6-hexamethylene diisocyanate), a polyether polyol as macrodiol (polyethylene glycol) and a biobased corn-derived 1,3-propanediol as chain extender (CE), in presence of a catalyst, at an initial temperature of 45°C. Equivalent TPU formulations with classical petroleum-based 1,3-propanediol were also prepared for a purpose of comparison. TPU with different soft to hard segment (SS/HS) ratios were synthesized by varying the macrodiol and CE concentrations in the formulations. For each formulation, the evolution of the reaction temperature as a function of time was monitored and the kinetics of polymerization was studied by Fourier Transform infrared spectroscopy in attenuated total reflection mode (FTIR-ATR). The morphology, thermal properties, solubility in different solvents and tensile properties of the final products were analyzed. All synthesized polyurethanes are 100% linear polymers and the extent of microphase separation, as well as the thermal and mechanical properties highly depends on the HS content, and glass transition temperature and Young modulus can be tuned by adjustment of the SS/HS ratio. All results indicate that petrochemical CE can be replaced by its recently available corn-derived homologue, without sacrificing any use properties of the final polyurethanes.

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“…They were obtained using a Lambert-Beer Law as described in reference [17] . It is worth to note that the kinetic constant of Zn(Ac) 2 (3 × 10 -2 mol -1.min -1 ) is ten times higher than BTO (~8 × 10 -3 mol -1.min -1 ).…”

Section: Resultsmentioning

confidence: 99%

Using different catalysts in the chemical recycling of waste from flexible polyurethane foams

Santos¹,

Carone²,

Dullius³

et al. 2013

Polímeros

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Due to their versatility, polyurethane (PU) foams have many different applications, such as sponges, filling materials in furniture, automotive seats and clothes, among others. It is also one of the main refrigerator components serving as a heat insulating material. As PUs find different application niches, they must be largely produced and, consequently, lots of waste are generated. In this work we intend to contribute to the recycle of this waste. The recovery of polyol from flexible polyurethane foams was carried out using the glycolysis process and testing different catalysts. Grounded polyurethane and a solvent, diethyleneglycol (DEG), were kept at 200 °C and under nitrogen atmosphere during three hours in the presence of a catalyst. All catalysts tested promoted the polyol mixture formation, with Zinc acetate producing the best depolymerization rate. The catalysts efficiency for the depolymerization reaction follows the order: DBTDL< BTO< HBTO< DEA ≈ Ba(Ac) 2 < MEA ≈ KAc< Zn(Ac) 2 .

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Kinetic study of polyurethane synthesis using different catalytic systems of Fe, Cu, Sn, and Cr

Cited by 38 publications

References 47 publications

New magnetic nanocomposites: Polyurethane/ Fe3O4-synthetic talc

New magnetic nanocomposites: Polyurethane/ Fe3O4-synthetic talc

Development of bio-based thermoplastic polyurethanes formulations using corn-derived chain extender for reactive rotational molding

Using different catalysts in the chemical recycling of waste from flexible polyurethane foams

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