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6. Synthesis of bio-polyurethanes with isosorbide and propanediol based poly(lactic acid) diol

Author

Dos Santos Silva, Ingridy Dayane, Albuquerque, Ananda, Boskamp, Laura, Ries, Andreas, Haag, Katharina, Koschek, Katharina, Wellen, Renate, and Publica

Subjects
biobased isocyanate polyurethane
Abstract

Synthesis of bio-polyurethane (Bio-PU) using isosorbide (ISO) andpoly(lactic acid) (PLA) diols, (propanediol based poly(lactic acid) (PLAP)and PLA esterified with Soybean oil (PLASO)) and pentamethylene (PDI)isocyanate were performed. Crosslinked Bio-PUs were obtained, and the details of the curing kinetics were determined via Fourier transform infrared spectroscopy (FTIR) spectra and differential scanning calorimetry(DSC). Distinct curing behaviors between Bio-PUs with different PLA diol formulations were observed. The addition of PLAP and PLASO increased the curing conversion at approximately 460% higher than Bio-PU without PLA content, as verified by FTIR. The curing peak temperature (Tp)of Bio-PUs with PLAP ranged from 94 to 163°C, while for PLASO Tp was 132-175°C. Bio-PUs based on PLA diols displayed lower activation energy (Ea) during curing as demonstrated using Friedman model, and higher thermal stability as evidenced through thermogravimetric analyses. Reported data offer reliable tools to evaluate the best rote to synthesize biobased polyurethane and manipulate the degree of crosslinking based on composition and processing conditions, allowing product processing to the desired application.

Published
2023

8. Curing and morphology approaches of polyurethane/poly(ethylene glycol) foam upon poly(lactic acid) addition.

Author

de Oliveira Almeida, Débora Evelyn, de Albuquerque, Ananda Karoline Camelo, dos Santos Silva, Ingridy Dayane, Ries, Andreas, and Wellen, Renate Maria Ramos

Subjects
URETHANE foam, ETHYLENE glycol, LACTIC acid, FOURIER transform infrared spectroscopy, POLYURETHANE elastomers, CURING, DIFFERENTIAL scanning calorimetry
Abstract

The effect of poly(lactic acid) (PLA) content on the curing of polyethylene glycol (PEG) based polyurethanes (PU) was investigated. Aiming to produce biobased PU foams, pentamethylene diisocyanate (PDI) was used. Fourier transform infrared spectroscopy (FTIR) found no curing evidence at 30°C and verified that the curing was completed at 300°C. This method tracks hydrogen bonding and NCO consumption. PLA addition decreased the curing rate as evidenced through differential scanning calorimetry (DSC) and promoted changes in the released heat which is linked to chemical and physical crosslinking. Complex peaks were verified in DSC scans whereas the peak at lower temperatures is related to the catalyzed curing while that in the higher ones is due to the homopolymerization. PU foams morphology was investigated using scanning electron microscopy (SEM). Pores and cell sizes are related to PLA content and hydrogen bonding. [ABSTRACT FROM AUTHOR]

Published
2022
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9. An investigation of PLA/Babassu cold crystallization kinetics

Author

dos Santos Silva, Ingridy Dayane, primary, Schäfer, Hannes, additional, Jaques, Nichollas Guimarães, additional, Siqueira, Danilo Diniz, additional, Ries, Andreas, additional, de Souza Morais, Dayanne Diniz, additional, Haag, Katharina, additional, Koschek, Katharina, additional, Carvalho, Laura Hecker, additional, and Ramos Wellen, Renate Maria, additional

Published
2019
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11. Melting and crystallization of PHB/ZnO compounds

Author

dos Santos Silva, Ingridy Dayane, primary, Guimarães Jaques, Nichollas, additional, da Cruz Barbosa Neto, Manoel, additional, Agrawal, Pankaj, additional, Ries, Andreas, additional, Ramos Wellen, Renate Maria, additional, and Canedo, Eduardo Luis, additional

Published
2017
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