Urethanes and polyurethanes bearing furan moieties. 4. Synthesis, kinetics and characterization of linear polymers

Boufi, Sami; Belgacem, Mohamed Naceur; Quillerou, Joel; Gandini, Alessandro

doi:10.1021/ma00077a003

Cited by 97 publications

(69 citation statements)

References 10 publications

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“…Quantification is based on the Beer-Lambert law and the validity for the isocyanate absorption is well established in literature (Boufi et al, 1993;Fan et al, 1996;Elwell et al, 1996) and confirmed in the previous work (Barreiro, 2000). In order to correct thickness changes during polymerization, a ratio between the absorbance of the isocyanate group and that of an internal standard (a group whose concentration does not change during the reaction course) is calculated.…”

Section: Analysis Of the Ftir Experimentssupporting

confidence: 59%

Monitoring of lignin-based polyurethane synthesis by FTIR-ATR

Cateto

Barreiro

Rodrigues

2008

Industrial Crops and Products

105

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Synthesis FTIR-ATR a b s t r a c t FTIR-ATR (Fourier Transform Infrared Spectroscopy working in the mode of Attenuated TotalReflectance) was applied to study the formation of lignin-based polyurethanes. Although some studies related to the use of lignin in polyurethane synthesis, are available in literature, still persist a gap for a systematic study of this kind of systems, involving the measurement of kinetic data, modelling and optimization of the polymerization process.The present methodology allows the test of different formulations at a scale of 3-5 g, considering several process variables: temperature, NCO/OH ratio, type and average molecular weight of the polyol, type of isocyanate, type and weight content of lignin.This work aims to describe the methodology used to perform the FTIR experiments by presenting a case study. The polyurethane samples have been prepared starting with 4,4 -methylene-diphenylene isocyanate (MDI), policaprolactonediol (PCL) of three different average molecular weights (1000, 750 and 400) and a commercial lignin (Indulin AT from Meadwestvaco) at different weight contents (10, 15, 20 and 25%). The results obtained in this work point out for the validation of the proposed experimental technique and confirm that lignin was incorporated in the final three-component polyurethane sample by chemical reaction with isocyanates, i.e., formation of urethane linkages.

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Section: Analysis Of the Ftir Experimentssupporting

confidence: 59%

Monitoring of lignin-based polyurethane synthesis by FTIR-ATR

Cateto

Barreiro

Rodrigues

2008

Industrial Crops and Products

105

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“…Because of the good mechanical properties and the flexible formula of the polyurethane, many researchers [22][23][24][25][26][27][28][29][30] have concentrated on polyurethane with DA adducts, including linear [24][25][26]29 and crosslinked 22,23,25,28,30,31 polyurethane.…”

Section: Introductionmentioning

confidence: 99%

Slightly crosslinked polyurethane with Diels–Alder adducts from trimethylolpropane

Jia

Chen

et al. 2016

J of Applied Polymer Sci

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Diels-Alder (DA) reactions between furan and maleimide have been widely applied in thermally remendable polymeric materials. Crosslinked polyurethane with DA adducts exhibited much better mechanical properties than linear polyurethane with DA adducts. However, the highly crosslinked polyurethane needs a higher temperature and a longer healing time. This will increase the possibility of side reactions proceeding during the healing procedure. In this paper, slightly crosslinked polyurethane with DA adducts was synthesized by incorporating trimethylolpropane into linear polyurethane with DA adducts. The structure of the intermediate and final products was characterized by Fourier transform infrared spectroscopy, 1 H-NMR, and differential scanning calorimetry, confirming that the synthesizing process proceeded successfully. The images from the polarizing optical microscope demonstrated that the final product with slight crosslinking needed less time and a lower healing temperature to complete the healing procedure. V C 2016Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43971.

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“…Difurylalkanes have a wide spectrum of practical use as monomers [1][2][3], modifiers [4,5], crosscoupling reagents [6,7] allowing to lower cost [8,9] and to expand assortment of polymer materials [10] in plastic manufacture. Some compounds of this class are of interest in dye chemistry [11] and copy engineering [12], in synthesis of macrocyclic compounds which are used as metal ions carriers [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Some compounds of this class are of interest in dye chemistry [11] and copy engineering [12], in synthesis of macrocyclic compounds which are used as metal ions carriers [13,14]. The difurylalkanes are of interest for food industry since they were found among numerous compounds making up coffee aroma [15] and other products [6][7][8][9][10][11][12][13][14][15][16][17][18]. Difurylmethane fragment is a component of structure of a number of fungicides [19].…”

Section: Introductionmentioning

confidence: 99%