Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen
Hydrophobic nanofibrilated cellulose (NFC) films were prepared by the casting of a mixture of NFC suspension in an aqueous emulsion of two blocked isocyanates - one prepared by the reaction of 4,4′- methylenebis (phenyl isocyanate) and phenol (MDI-2Ph) and a commercial one from trimethylol propane a...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Carbohydrate Polymer Technologies and Applications |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666893922000652 |
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| author | Gustavo de Souza Mohamed Naceur Belgacem Alessandro Gandini Antonio José Felix Carvalho |
| author_facet | Gustavo de Souza Mohamed Naceur Belgacem Alessandro Gandini Antonio José Felix Carvalho |
| author_sort | Gustavo de Souza |
| collection | DOAJ |
| description | Hydrophobic nanofibrilated cellulose (NFC) films were prepared by the casting of a mixture of NFC suspension in an aqueous emulsion of two blocked isocyanates - one prepared by the reaction of 4,4′- methylenebis (phenyl isocyanate) and phenol (MDI-2Ph) and a commercial one from trimethylol propane and toluene diisocyanate (Desmodur AP Stabil®) (TMP-TDI-3Ph),). The drying procedure was performed in two steps, i.e., first at 60 °C for 24 h and then at 170 °C for 10 min. Infrared spectroscopy (FT-IR), elemental analysis, and 13 CNMR confirmed the chemical modification of cellulose. The NFC modified films showed an approximately 40 g m−2.day−1 water vapor transmission rate, which is almost 75% lower than that of non-modified NFC films (153 g m−2.day−1). The film modified with TMP-TDI-3Ph showed a very low oxygen transmission rate and lower than that with MDI-2Ph When exposed to a wet environment, the modified films maintained their stiffness with Young's modulus around 5 GPa, whereas that of non- modified films decreased from approximately 6.5 GPa to below 0.1 GPa. |
| first_indexed | 2024-04-11T09:48:30Z |
| format | Article |
| id | doaj.art-3e512318436744b7a554d9d9c1565080 |
| institution | Directory Open Access Journal |
| issn | 2666-8939 |
| language | English |
| last_indexed | 2024-04-11T09:48:30Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Carbohydrate Polymer Technologies and Applications |
| spelling | doaj.art-3e512318436744b7a554d9d9c15650802022-12-22T04:30:55ZengElsevierCarbohydrate Polymer Technologies and Applications2666-89392022-12-014100249Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygenGustavo de Souza0Mohamed Naceur Belgacem1Alessandro Gandini2Antonio José Felix Carvalho3Department of Materials Engineering, Sao Carlos School of Engineering (EESC), University of São Paulo - USP, 13563-120 São Carlos, SP, Brazil; Université Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000, Grenoble, FranceUniversité Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000, Grenoble, FranceUniversité Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000, Grenoble, FranceDepartment of Materials Engineering, Sao Carlos School of Engineering (EESC), University of São Paulo - USP, 13563-120 São Carlos, SP, Brazil; Corresponding author.Hydrophobic nanofibrilated cellulose (NFC) films were prepared by the casting of a mixture of NFC suspension in an aqueous emulsion of two blocked isocyanates - one prepared by the reaction of 4,4′- methylenebis (phenyl isocyanate) and phenol (MDI-2Ph) and a commercial one from trimethylol propane and toluene diisocyanate (Desmodur AP Stabil®) (TMP-TDI-3Ph),). The drying procedure was performed in two steps, i.e., first at 60 °C for 24 h and then at 170 °C for 10 min. Infrared spectroscopy (FT-IR), elemental analysis, and 13 CNMR confirmed the chemical modification of cellulose. The NFC modified films showed an approximately 40 g m−2.day−1 water vapor transmission rate, which is almost 75% lower than that of non-modified NFC films (153 g m−2.day−1). The film modified with TMP-TDI-3Ph showed a very low oxygen transmission rate and lower than that with MDI-2Ph When exposed to a wet environment, the modified films maintained their stiffness with Young's modulus around 5 GPa, whereas that of non- modified films decreased from approximately 6.5 GPa to below 0.1 GPa.http://www.sciencedirect.com/science/article/pii/S2666893922000652Nanofibrillated cellulose filmsBlocked isocyanate emulsionBlocked isocyanate suspensionsDesmodur AP stabilUrethane modified nanofibrillated cellulose filmsIsocyanate deblocking |
| spellingShingle | Gustavo de Souza Mohamed Naceur Belgacem Alessandro Gandini Antonio José Felix Carvalho Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen Carbohydrate Polymer Technologies and Applications Nanofibrillated cellulose films Blocked isocyanate emulsion Blocked isocyanate suspensions Desmodur AP stabil Urethane modified nanofibrillated cellulose films Isocyanate deblocking |
| title | Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen |
| title_full | Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen |
| title_fullStr | Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen |
| title_full_unstemmed | Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen |
| title_short | Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen |
| title_sort | synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen |
| topic | Nanofibrillated cellulose films Blocked isocyanate emulsion Blocked isocyanate suspensions Desmodur AP stabil Urethane modified nanofibrillated cellulose films Isocyanate deblocking |
| url | http://www.sciencedirect.com/science/article/pii/S2666893922000652 |
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