Síntesis de poli ácido láctico y poli ricinoleato empleando calentamiento por microondas y su utilización en la producción de termoplasticos de poliuretano

Mazo, Paula; Ríos, Luis; Restrepo, Gloria

doi:10.1590/s0104-14282011005000027

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…Ricinoleic acid has one hydroxyl group and is the most abundant fatty acid in CO, 8 which has been studied as a renewable source for PU synthesis. 1,[9][10][11] In the biomedical field,…”

Section: Introductionmentioning

confidence: 99%

Polyurethanes from modified castor oil and chitosan

Ramírez

Andrade

Uscátegui

et al. 2017

Journal of Elastomers & Plastics

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The aim of this study was to evaluate the effect of polyol and chitosan (CS) incorporation within polyurethanes (PUs) and their resulting thermal stability, hardness, swelling behaviour, in vitro degradation, and cell viability to establish the potential for these materials in biomedical applications. CO (CO) was modified by a transesterification reaction with pentaerythritol. Original CO and modified CO, isophorone diisocyanate (IPDI) in a NCO/OH equal to 1, CS were used for PU synthesis. PUs were characterized by FTIR, hydroxyl value (ASTM D1957), thermogravimetric analysis, and Shore A hardness (ASTM D2240). The contact angle and swelling assay with PBS was carried out to study the hydrophilic character. Assays at 37°C and 105°C assessed in vitro degradation. Finally, the cell viability of a L-929 mouse embryo fibroblast was performed on solid polymers and degradation products. The hydroxyl value confirms CO modification, and IR analysis confirms CS incorporation into the matrix. The thermal assay does not show that new degradation stages and polyol, with a high functionality, had better mechanicals results due to the increase in crosslinking. The contact angle shows the hydrophobic surface with an angle over 65°, and the CS and polyol

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“…Ricinoleic acid has one hydroxyl group and is the most abundant fatty acid in CO, 8 which has been studied as a renewable source for PU synthesis. 1,[9][10][11] In the biomedical field,…”

Section: Introductionmentioning

confidence: 99%

Polyurethanes from modified castor oil and chitosan

Ramírez

Andrade

Uscátegui

et al. 2017

Journal of Elastomers & Plastics

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“…For both samples, the presence of OH, C=O and C-H group is observed at 1414.9 cm -1 (SF3 sample) and at 1412.5 cm -1 (SF2 sample), and there is a difference between them in the range of 1500 to 650 cm -1 , where are peaks for the SF2 sample (40°C for 5 h) that belongs to C-O at 1206.5, 1121, 1053.6 and 982.7 cm -1 , while for the SF3 sample only there are two peaks at 1638.0 cm -1 (C=O group) and at 1414.9 cm -1 (C-H group). As in the previous cases, lactic acid is not totally pure and if both samples are compared, the SF2 sample could be selected, which according to the peak at 1120 cm -1 corresponds to DL-lactic acid at 85% purity [17] with a higher yield.…”

Section: Resultsmentioning

confidence: 99%

Influence Of Kluyveromyces Lactis Arranged In Suspension And Immobilized On Obtaining Lactic Acid By Cheese Whey Fermentation

Vargas,

Gordillo-Andia,,

Tupayachy-Quispe

et al. 2023

Proceedings of the 9th World Congress on New Technologies

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Lactic acid has several applications in the pharmaceutical, food, cosmetic and chemical industries, and is currently used for its transformation into polylactic acid, which is a biopolymer used to produce environmentally friendly bioplastics. So, in the present research lactic acid was obtained from the fermentation of cheese whey, that is a waste from the cheese industry that generates high environmental pollution, hence, this research seeks to give it an added value. Thus, the Kluyveromyces lactis strain was isolated from the cheese whey, which was also used for the fermentation process and the obtaining of lactic acid, using proteinized (fresh) and deproteinized cheese whey, the strains arranged in suspension and immobilized in order to determine if those conditions have an influence on the characteristics of lactic acid. It has been confirmed that the arrangement of the strain used (in free or encapsulated form), the use of untreated and deproteinized cheese whey, and the purification conditions have an influence on the characteristics and yields of the lactic acid obtained (color, density, and the presence of other functional groups in it).

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“…La síntesis de polímeros que se encuentra en vía de desarrollo es la síntesis de polímeros asistida por microondas, que en un conjunto de trabajos realizados ha demostrado reducir www.cienciadigital.org considerablemente los tiempos de reacción, lo que supone costos energéticos más bajos, sistemas de reacción más seguros y mayor rendimiento en las reacciones (Garro, Jiménez, & Vega, 2013). La fuente de calentamiento de microondas acelera las reacciones de policondensación (Mazo, Rios, & Restrepo, 2011), incluso un estudio realizado, en el que se sintetiza polímeros tribloque demuestra que la técnica de irradiación de microondas fue más rápida que una síntesis en la cual se utilizó un disolvente supercrítico dióxido de carbono supercrítico (scCO2) (Kamali, Khodaverdi, & Hadizadeh, 2018).…”

Section: Introductionunclassified

Síntesis de PIRIDIL-tolanos mediante un acoplamiento de sonogashira asistido por microondas

Fiallos¹,

Freire²,

Alcoser³

2020

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Se ha apostado al uso del microondas en la síntesis orgánica para la obtención de piridil tolanos, ya que es capaz de proporcionar suficiente energía de tal manera que es posible cruzar cierta barrera energética, su uso proporciona una disminución en el tiempo de reacción teniendo como resultado productos de rendimiento alto en los cuales fue posible limitar los procesos de purificación. Es así que en el presente trabajo se realizó la síntesis de piridil-tolanos catalizadas por paladio mediante un acoplamiento de Sonogashira asistido por microondas. La purificación de los compuestos sintetizados se realizó mediante cromatografía en columna ultrarrápida utilizando gel de sílice 60 GF254 con una presión positiva de nitrógeno y con disolventes adecuados para la remoción de materia inorgánica indeseable (residuos de Cu). La caracterización se realizó mediante Resonancia Magnética Nuclear tanto de Hidrógeno como Carbono, para poder evidenciar así la presencia del triple enlace formado con el acoplamiento de Sonogashira. Se registraron s espectros de Resonancia Magnética Nuclear en un espectrofotómetro Bruker AMX-300 equipado con una sonda multinuclear inversa de 5mm, utilizando CDCl3 como disolvente. como resultado se obtuvieron el 2- piridil-tolano, 3-piridil-tolano y el 4-piridil-tolano, que fueron sintetizados con rendimientos aceptables del 71, 73 y 78% respectivamente.

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Síntesis de poli ácido láctico y poli ricinoleato empleando calentamiento por microondas y su utilización en la producción de termoplasticos de poliuretano

Cited by 7 publications

References 18 publications

Polyurethanes from modified castor oil and chitosan

Polyurethanes from modified castor oil and chitosan

Influence Of Kluyveromyces Lactis Arranged In Suspension And Immobilized On Obtaining Lactic Acid By Cheese Whey Fermentation

Síntesis de PIRIDIL-tolanos mediante un acoplamiento de sonogashira asistido por microondas

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