Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid

Gianfranco Carotenuto; Luigi Nicolais

doi:10.20944/preprints202405.0119.v3

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preprints.org > chemistry and materials science > polymers and plastics > doi: 10.20944/preprints202405.0119.v3

Preprint Article Version 3 Preserved in Portico This version is not peer-reviewed

Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid

Gianfranco Carotenuto

^* and

Luigi Nicolais

Version 1 : Received: 1 May 2024 / Approved: 2 May 2024 / Online: 2 May 2024 (10:00:03 CEST)
Version 2 : Received: 19 May 2024 / Approved: 20 May 2024 / Online: 20 May 2024 (10:45:07 CEST)
Version 3 : Received: 27 May 2024 / Approved: 28 May 2024 / Online: 28 May 2024 (09:48:17 CEST)
Version 4 : Received: 22 June 2024 / Approved: 22 June 2024 / Online: 24 June 2024 (08:14:26 CEST)
Version 5 : Received: 5 July 2024 / Approved: 6 July 2024 / Online: 8 July 2024 (09:04:14 CEST)

How to cite: Carotenuto, G.; Nicolais, L. Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid. Preprints 2024, 2024050119. https://doi.org/10.20944/preprints202405.0119.v3 Carotenuto, G.; Nicolais, L. Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid. Preprints 2024, 2024050119. https://doi.org/10.20944/preprints202405.0119.v3

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MDPI and ACS Style

Carotenuto, G.; Nicolais, L. Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid. Preprints 2024, 2024050119. https://doi.org/10.20944/preprints202405.0119.v3

APA Style

Carotenuto, G., & Nicolais, L. (2024). Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid. Preprints. https://doi.org/10.20944/preprints202405.0119.v3

Chicago/Turabian Style

Carotenuto, G. and Luigi Nicolais. 2024 "Poly(Vinyl Alcohol) Chemical-Dehydration to Polyacetylene By Fuming Sulfuric Acid" Preprints. https://doi.org/10.20944/preprints202405.0119.v3

Abstract

Recently, polyacetylene (PA) and polyenes (polyvinylenes) are receiving renewed scientific attention due to their unique physical properties potentially useful also for a number of non-electrical applications (e.g., hydrogen storage, drug delivery, adsorbent of organic compounds in aqueous systems, gas and liquid separation, oxygen absorbent in gas analysis, etc.). These chemical compounds can be obtained in form of a polyacetylene-PVOH copolymers simply by chemical dehydration of poly(vinyl alcohol) (PVOH), which is a very common type of polymer, widely used in different technological areas. This very inexpensive chemical reaction for the large-scale synthesis of PA/polyvinylenes has been investigated by reacting PVOH with fuming sulfuric acid at room temperature. In this process, PVOH, shaped in form of film, is dipped in fuming sulfuric acid (i.e., H₂SO₄ at 95-97%) and, after complete chemical-dehydration, it has been mechanically removed from the liquid phase by using a nylon sieve. The reduction process leads to a substantial PVOH film conversion to PA as it has been proved by infrared spectroscopy (ATR-mode). Indeed, the ATR spectrum of the reaction product included all characteristic absorption bands of PA. The reaction product has been also characterized by differential scanning calorimetry (DSC) and absorption optical spectroscopy (UV-Vis) in order to evidence respectively its solid-state thermal isomerization (cis-PA conversion to trans-PA) and presence in the structure of conjugated carbon-carbon double bonds of various extensions.

Keywords

Polyacetylene; Polyenes; Polyvinylenes; Polyvinylalcohol; Chemical-dehydration; Fuming sulfuric acid; Infrared spectroscopy; Optical spectroscopy; Isomerization; Calorimetry (DSC).

Subject

Chemistry and Materials Science, Polymers and Plastics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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