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Hybrid Silica-Phytic Acid Coatings: Effect on the Thermal Stability and Flame Retardancy of Cotton.
Polymers (Basel). 2019 Oct 12; 11(10)P

Abstract

New hybrid sol-gel coatings based on tetraethoxysilane (TEOS) and phytic acid (PA) were designed and applied to cotton; the flame-retardant properties of the treated fabrics were thoroughly investigated by means of flame-spread and forced-combustion tests. The first goal was to identify the TEOS:PA weight ratio that allowed the achievement of the best flame-retardant properties, with the lowest final dry add-on on the fabrics. Therefore, different TEOS:PA sols were prepared and applied to cotton, and the resulting coated fabrics were thoroughly investigated. In particular, solid-state NMR spectroscopy was exploited for assessing the condensation degree during the sol-gel process, even for evaluating the occurrence of possible reactions between phytic acid and the cellulosic substrate or the alkoxy precursor. It was found that a total dry add-on of 16 wt. % together with 70:30 TEOS:PA weight ratio provided cotton with self-extinction, as clearly indicated by flame-spread tests. This formulation was further investigated in forced-combustion tests: a significant reduction of heat release rate (HRR), of the peak of HRR, and of total heat release (THR) was found, together with a remarkable increase of the residues after the test. Unfortunately, the treated fabrics were not resistant to washing cycles, as they significantly lost their flame-retardant properties, consequently to the partial removal of the deposited hybrid coatings.

Authors+Show Affiliations

Department. of Applied Science and Technology, Local INSTM Unit, Viale Teresa Michel 5, 15121 Alessandria (Italy). marco.barbalini@polito.it.Institute of Physics of Materials of the Czech Republic, Brittle Fracture Group, Žižkova 22, 61662 Brno, Czechia. bertolla@drs.ipm.cz.CEITEC-Central European Institute of Technology, Masaryk University, Kamenice 5/4A, 62500 Brno, Czechia. jaromir.tousek@ceitec.muni.cz.Department. of Applied Science and Technology, Local INSTM Unit, Viale Teresa Michel 5, 15121 Alessandria (Italy). giulio.malucelli@polito.it.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31614810

Citation

Barbalini, Marco, et al. "Hybrid Silica-Phytic Acid Coatings: Effect On the Thermal Stability and Flame Retardancy of Cotton." Polymers, vol. 11, no. 10, 2019.
Barbalini M, Bertolla L, Toušek J, et al. Hybrid Silica-Phytic Acid Coatings: Effect on the Thermal Stability and Flame Retardancy of Cotton. Polymers (Basel). 2019;11(10).
Barbalini, M., Bertolla, L., Toušek, J., & Malucelli, G. (2019). Hybrid Silica-Phytic Acid Coatings: Effect on the Thermal Stability and Flame Retardancy of Cotton. Polymers, 11(10). https://doi.org/10.3390/polym11101664
Barbalini M, et al. Hybrid Silica-Phytic Acid Coatings: Effect On the Thermal Stability and Flame Retardancy of Cotton. Polymers (Basel). 2019 Oct 12;11(10) PubMed PMID: 31614810.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Hybrid Silica-Phytic Acid Coatings: Effect on the Thermal Stability and Flame Retardancy of Cotton. AU - Barbalini,Marco, AU - Bertolla,Luca, AU - Toušek,Jaromír, AU - Malucelli,Giulio, Y1 - 2019/10/12/ PY - 2019/08/29/received PY - 2019/10/10/revised PY - 2019/10/11/accepted PY - 2019/10/17/entrez PY - 2019/10/17/pubmed PY - 2019/10/17/medline KW - cotton KW - durability KW - flame retardancy KW - phytic acid KW - solid state NMR spectroscopy KW - sol–gel processes KW - thermal stability JF - Polymers JO - Polymers (Basel) VL - 11 IS - 10 N2 - New hybrid sol-gel coatings based on tetraethoxysilane (TEOS) and phytic acid (PA) were designed and applied to cotton; the flame-retardant properties of the treated fabrics were thoroughly investigated by means of flame-spread and forced-combustion tests. The first goal was to identify the TEOS:PA weight ratio that allowed the achievement of the best flame-retardant properties, with the lowest final dry add-on on the fabrics. Therefore, different TEOS:PA sols were prepared and applied to cotton, and the resulting coated fabrics were thoroughly investigated. In particular, solid-state NMR spectroscopy was exploited for assessing the condensation degree during the sol-gel process, even for evaluating the occurrence of possible reactions between phytic acid and the cellulosic substrate or the alkoxy precursor. It was found that a total dry add-on of 16 wt. % together with 70:30 TEOS:PA weight ratio provided cotton with self-extinction, as clearly indicated by flame-spread tests. This formulation was further investigated in forced-combustion tests: a significant reduction of heat release rate (HRR), of the peak of HRR, and of total heat release (THR) was found, together with a remarkable increase of the residues after the test. Unfortunately, the treated fabrics were not resistant to washing cycles, as they significantly lost their flame-retardant properties, consequently to the partial removal of the deposited hybrid coatings. SN - 2073-4360 UR - https://www.unboundmedicine.com/medline/citation/31614810/Hybrid_Silica_Phytic_Acid_Coatings:_Effect_on_the_Thermal_Stability_and_Flame_Retardancy_of_Cotton_ L2 - http://www.mdpi.com/resolver?pii=polym11101664 DB - PRIME DP - Unbound Medicine ER -
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