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Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications.
ACS Appl Mater Interfaces. 2015 Sep 30; 7(38):21208-17.AA

Abstract

A broad spectrum of applications of "Salen"-based Schiff bases tagged them as versatile multifunctional materials. However, their applicability is often bounded by a temperature threshold and, thus, they have rarely been used for high temperature applications. Our investigation of a classical Schiff base, N,N'-bis(4-hydroxysalicylidene)ethylenediamine (L2), reveals that it displays an intriguingly combative response to an elevated temperature/fire scenario. L2 resists and regulates thermal degradation by forming an ablative surface, and acts as a thermal shield. A polycondensation via covalent cross-linking, which forms a hyperbranched cross-linked resin is found to constitute the origin of the ablative surface. This is a unique example of a resin formation produced with a Schiff base, that mimicks the operational strategy of a high-heat resistant phenolic resin. Further applicability of L2, as a flame retardant, was tested in an engineering polymer, polyamide-6. It was found that it reinforces the polymer against fire risks by the formation of an intumescent coating. This paves the way for a new strategic avenue in safeguarding polymeric materials toward fire risks. Further, this material represents a promising start for thermal protective applications.

Authors+Show Affiliations

ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France.ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France.ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France.ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26348914

Citation

Naik, Anil D., et al. "Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications." ACS Applied Materials & Interfaces, vol. 7, no. 38, 2015, pp. 21208-17.
Naik AD, Fontaine G, Bellayer S, et al. Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications. ACS Appl Mater Interfaces. 2015;7(38):21208-17.
Naik, A. D., Fontaine, G., Bellayer, S., & Bourbigot, S. (2015). Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications. ACS Applied Materials & Interfaces, 7(38), 21208-17. https://doi.org/10.1021/acsami.5b05164
Naik AD, et al. Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications. ACS Appl Mater Interfaces. 2015 Sep 30;7(38):21208-17. PubMed PMID: 26348914.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications. AU - Naik,Anil D, AU - Fontaine,Gaëlle, AU - Bellayer,Séverine, AU - Bourbigot,Serge, Y1 - 2015/09/16/ PY - 2015/9/9/entrez PY - 2015/9/9/pubmed PY - 2015/9/9/medline KW - Flame retardancy KW - Phenolic resin KW - Polymers KW - Resorcinol KW - Salen KW - Schiff base SP - 21208 EP - 17 JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces VL - 7 IS - 38 N2 - A broad spectrum of applications of "Salen"-based Schiff bases tagged them as versatile multifunctional materials. However, their applicability is often bounded by a temperature threshold and, thus, they have rarely been used for high temperature applications. Our investigation of a classical Schiff base, N,N'-bis(4-hydroxysalicylidene)ethylenediamine (L2), reveals that it displays an intriguingly combative response to an elevated temperature/fire scenario. L2 resists and regulates thermal degradation by forming an ablative surface, and acts as a thermal shield. A polycondensation via covalent cross-linking, which forms a hyperbranched cross-linked resin is found to constitute the origin of the ablative surface. This is a unique example of a resin formation produced with a Schiff base, that mimicks the operational strategy of a high-heat resistant phenolic resin. Further applicability of L2, as a flame retardant, was tested in an engineering polymer, polyamide-6. It was found that it reinforces the polymer against fire risks by the formation of an intumescent coating. This paves the way for a new strategic avenue in safeguarding polymeric materials toward fire risks. Further, this material represents a promising start for thermal protective applications. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/26348914/Crossing_the_Traditional_Boundaries:_Salen_Based_Schiff_Bases_for_Thermal_Protective_Applications_ L2 - https://doi.org/10.1021/acsami.5b05164 DB - PRIME DP - Unbound Medicine ER -
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