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Degradation of hydroxypropyl methylcellulose (HPMC) by acoustic and hydrodynamic cavitation
ID
Zupanc, Andraž
(
Author
),
ID
Petkovšek, Martin
(
Author
),
ID
Zdovc, Blaž
(
Author
),
ID
Žagar, Ema
(
Author
),
ID
Zupanc, Mojca
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S1350417724002682
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Abstract
The present study aims to investigate the degradation of HPMC on a laboratory scale by acoustic and hydrodynamic cavitation. The effects of temperature and the addition of an external oxidizing agent on the effectiveness of HPMC degradation were systematically investigated by SEC/MALS-RI, FTIR and 1H NMR. The results of the experiments without cavitation show that an external oxidizing agent alone reduces the weight-average molar mass at 60 °C in 30 min for 45.1 % (from 335 to 184 kg mol−1). However, the weight-average molar mass of HPMC decreased significantly more in the cavitation treatment, for 98.8 % (from 335 to 4 kg mol−1) in 30 min at optimal operating conditions of hydrodynamic cavitation (i.e. addition of external oxidant and 60 °C) with a concomitant narrowing of the molar mass distribution, as shown by the dispersity value, which decreased from 2.24 to 1.31. Compared to acoustic cavitation, hydrodynamic cavitation also proved to be more energy efficient. The FTIR spectra of the cavitated HPMC samples without the addition of H2O2 show negligible oxidation of the hydroxyl groups and the glycosidic bonds, confirming that mechanical effects predominate in HPMC degradation in these cases. In contrast, when H2O2 was added, FTIR and 1H NMR show typical signals for cellulose oxidation products, especially when the experiments were performed at 60 °C, confirming that chemical as well as mechanical effects are responsible for the extensive HPMC degradation in these cases. Since treatment methods that lead to lower molar masses and narrower molar mass distributions of the polymers are lacking or require longer treatment times (e.g. 24 h), mechanochemical treatment methods such as cavitation have great potential, as they enable faster polymer degradation (in our case 30 min) through a combination of mechanical and/or chemical degradation mechanisms.
Language:
English
Keywords:
hydroxypropyl methylcellulose
,
acoustic cavitation
,
hydrodynamic cavitation
,
degradation
,
oxidation
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2024
Number of pages:
9 str.
Numbering:
Vol. 109, art. 107020
PID:
20.500.12556/RUL-160047
UDC:
532.528:542.943
ISSN on article:
1873-2828
DOI:
10.1016/j.ultsonch.2024.107020
COBISS.SI-ID:
204078851
Publication date in RUL:
12.08.2024
Views:
112
Downloads:
34
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Record is a part of a journal
Title:
Ultrasonics Sonochemistry
Publisher:
Elsevier
ISSN:
1873-2828
COBISS.SI-ID:
23127813
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
hidroksipropil metilceluloza
,
akustična kavitacija
,
hidrodinamska kavitacija
,
degradacija
,
oksidacija
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0401
Name:
Energetsko strojništvo
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0422
Name:
Funkcionalne tekočine za napredne energetske sisteme
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0145
Name:
Polimeri in polimerni materiali s posebnimi lastnostmi
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-3044
Name:
Kontroliranje ekstremnih kavitacijskih pogojev z lasersko funkcionalizacijo površin (eCATS)
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-4480
Name:
Odstranjevanje izbranih protimikrobnih učinkovin s hibridno kavitacijsko-plazemsko tehnologijo iz vodnih matric različnih kompleksnosti (Causma)
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-50054
Name:
Kemijska reciklaža poliuretanskih pen
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