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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Cordero, Andrés Ignacio Amalvy, Javier Ignacio Fortunati, Elena Kenny, José María Chiacchiarelli, Leonel Matías |
| Description | Country affiliation: Argentina Author Affiliation: Cordero AI ( Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT La Plata CONICET-UNLP, Diag. 113 y 64, La Plata, Argentina.); Amalvy JI ( Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT La Plata CONICET-UNLP, Diag. 113 y 64, La Plata, Argentina.); Fortunati E ( Materials Engineering Center, UdR INSTM, University of Perugia, Strada di Pentima 4 05100 Terni, Italy.); Kenny JM ( Materials Engineering Center, UdR INSTM, University of Perugia, Strada di Pentima 4 05100 Terni, Italy.); Chiacchiarelli LM ( Instituto de Tecnología de Polímeros y Nanotecnología (ITPN), CONICET-UBA, Buenos Aires, Argentina. Electronic address: lmchiacchiarelli@yahoo.com.ar.) |
| Abstract | Nanocrystalline cellulose (CNC), obtained by sulphuric acid hydrolysis, was used to synthesize polyurethane foams (PUFs) based on a functionalized castor oil polyol and a Methylene diphenyl diisocyanate (MDI). Formulations with varying isocyanate index (FI) and NCO number were prepared. At 0.5 wt.%, SEM's of the fractured surface underlined that the CNC acted both as a nucleation agent and as a particulate surfactant with cell geometries and apparent density changing selectively. The chemical structure of the PUF (FTIR) changed after the incorporation of CNC by a relative change of the amount of urea, urethane and isocyanurate groups. A low NCO number and isocyanate index contributed to the migration of the CNC to the Hard Segment (HS), acting as reinforcement and improving substantially the compressive mechanical properties (Ec and σc improvements of 63 and 50%, respectively). For a high NCO number or isocyanate index, the CNC migrated to the Soft Segment (SS), without causing a reinforcement effect. The migration of the CNC was also detected with DSC, TGA and DMA, furtherly supporting the hypothesis that a low NCO number and index contributed both to the formation of a microstructure with a higher content of urethane groups. |
| File Format | HTM / HTML |
| ISSN | 01448617 |
| Volume Number | 134 |
| e-ISSN | 18791344 |
| Journal | Carbohydrate Polymers |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-12-10 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry__semicolon__materials Discipline Science Castor Oil Chemistry Nanocomposites Ultrastructure Nanoparticles Polyurethanes Chemical Synthesis Elastic Modulus Isocyanates Temperature Thermogravimetry Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Materials Chemistry Polymers and Plastics |
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