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. 2022 Aug 4;12(15):2685.
doi: 10.3390/nano12152685.

Phosphorylated Poly(vinyl alcohol) Electrospun Mats for Protective Equipment Applications

Diana Serbezeanu  1 , Tăchiță Vlad-Bubulac  1 , Mihaela Dorina Onofrei  1 , Florica Doroftei  1 , Corneliu Hamciuc  1 , Alina-Mirela Ipate  1 , Alexandru Anisiei  1 , Gabriela Lisa  2 , Ion Anghel  3 , Ioana-Emilia Şofran  3 , Vasilica Popescu  4
Affiliations

Phosphorylated Poly(vinyl alcohol) Electrospun Mats for Protective Equipment Applications

Diana Serbezeanu et al. Nanomaterials (Basel). .

Abstract

The development of intelligent materials for protective equipment applications is still growing, with enormous potential to improve the safety of personnel functioning in specialized professions, such as firefighters. The design and production of such materials by the chemical modification of biodegradable semisynthetic polymers, accompanied by modern manufacturing techniques such as electrospinning, which may increase specific properties of the targeted material, continue to attract the interest of researchers. Phosphorus-modified poly(vinyl alcohol)s have been, thus, synthesized and utilized to prepare environmentally friendly electrospun mats. Poly(vinyl alcohol)s of three different molecular weights and degrees of hydrolysis were phosphorylated by polycondensation reaction in solution in the presence of phenyl dichlorophosphate in order to enhance their flame resistance and thermal stability. The thermal behavior and the flame resistance of the resulting phosphorus-modified poly(vinyl alcohol) products were investigated by thermogravimetric analysis and by cone calorimetry at a micro scale. Based on the as-synthesized phosphorus-modified poly(vinyl alcohol)s, electrospun mats were successfully fabricated by the electrospinning process. Rheology studies were performed to establish the optimal conditions of the electrospinning process, and scanning electron microscopy investigations were undertaken to observe the morphology of the phosphorus-modified poly(vinyl alcohol) electrospun mats.

Keywords: MCC test; PVA; electrospun mats; flame resistance; phenyl dichlorophosphate; thermal stability.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Chemical structure of PVA-OP (1-3).
Figure 2
Figure 2
FTIR spectra of the PVA-OP (1-3) samples.
Figure 3
Figure 3
TG and DTG curves for phosphorus-modified poly(vinyl alcohol)s.
Figure 4
Figure 4
DSC curves for phosphorus-modified poly(vinyl alcohol)s.
Figure 5
Figure 5
SEM images of PVA-OP2 pyrolysis residues at 342 °C (a) and 475 °C (b), in the oven of the thermogravimetric analyzer in nitrogen with a heating rate of 10 °C/min.
Figure 6
Figure 6
HRR versus temperature for PVA-OP (1-3).
Figure 7
Figure 7
Specific viscosity versus PVA-OP3 concentration in distilled water. SEM images are presented, allowing the visualization of the formation of nanofibers depending on the concentration.
Figure 8
Figure 8
SEM images for the PVA-OP (1-3) electrospun mats at optimal concentration: (a) PVA-OP1; (b) PVA-OP2; (c) PVA-OP3.
Figure 9
Figure 9
SEM images for PVA-OP3 at different concentrations (15% w/v (a), 20% w/v (b), and 25% w/v (c)).
See this image and copyright information in PMC

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