Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres
Almond shells (ASs) are a potential source of cellulose that could be obtained through sustainable methods for their valorisation. Biocomposites (BCs) from polyvinyl alcohol (PVA) and cellulose are interesting materials for developing sustainable packaging materials. BC based on PVA and AS cellulose...
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MDPI AG
2025-01-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/30/2/372 |
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| author | Irene Gil-Guillén Chelo González-Martínez Amparo Chiralt |
| author_facet | Irene Gil-Guillén Chelo González-Martínez Amparo Chiralt |
| author_sort | Irene Gil-Guillén |
| collection | DOAJ |
| description | Almond shells (ASs) are a potential source of cellulose that could be obtained through sustainable methods for their valorisation. Biocomposites (BCs) from polyvinyl alcohol (PVA) and cellulose are interesting materials for developing sustainable packaging materials. BC based on PVA and AS cellulose were obtained by melt blending and compression moulding, by using subcritical water extraction at 160 or 180 °C, and subsequent bleaching with sodium chlorite (C) or hydrogen peroxide (P) to purify cellulose. The influence of the purification method on the properties of BC was analysed. Fibres treated with C were better dispersed in composites than those bleached with P. Residual phenolic compounds in the fibres provide the composite with ABTS∙+ scavenging capacity in line with the residual lignin content of the fibres. Both the presence of phenols and dispersed fibres reduced the film transparency, mainly in the UV range. Fibres enhanced the oxygen barrier capacity of composites, and those treated with HP also improved the water vapour barrier capacity. Fibres treated with C better promoted the increase in the elastic modulus of the composites, due to their highest crystallinity and dispersibility, while favoured the PVA crystallisation. Therefore, the obtained AS cellulose fibres could be used to obtain thermoprocessed PVA biocomposites for food packaging applications. |
| format | Article |
| id | doaj-art-a3949bda65d141d5b210f10e6fef36a5 |
| institution | Kabale University |
| issn | 1420-3049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj-art-a3949bda65d141d5b210f10e6fef36a52025-01-24T13:43:48ZengMDPI AGMolecules1420-30492025-01-0130237210.3390/molecules30020372Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell FibresIrene Gil-Guillén0Chelo González-Martínez1Amparo Chiralt2Institute of Food Engineering-FoodUPV, Universitat Politècnica de València, 46022 Valencia, SpainInstitute of Food Engineering-FoodUPV, Universitat Politècnica de València, 46022 Valencia, SpainInstitute of Food Engineering-FoodUPV, Universitat Politècnica de València, 46022 Valencia, SpainAlmond shells (ASs) are a potential source of cellulose that could be obtained through sustainable methods for their valorisation. Biocomposites (BCs) from polyvinyl alcohol (PVA) and cellulose are interesting materials for developing sustainable packaging materials. BC based on PVA and AS cellulose were obtained by melt blending and compression moulding, by using subcritical water extraction at 160 or 180 °C, and subsequent bleaching with sodium chlorite (C) or hydrogen peroxide (P) to purify cellulose. The influence of the purification method on the properties of BC was analysed. Fibres treated with C were better dispersed in composites than those bleached with P. Residual phenolic compounds in the fibres provide the composite with ABTS∙+ scavenging capacity in line with the residual lignin content of the fibres. Both the presence of phenols and dispersed fibres reduced the film transparency, mainly in the UV range. Fibres enhanced the oxygen barrier capacity of composites, and those treated with HP also improved the water vapour barrier capacity. Fibres treated with C better promoted the increase in the elastic modulus of the composites, due to their highest crystallinity and dispersibility, while favoured the PVA crystallisation. Therefore, the obtained AS cellulose fibres could be used to obtain thermoprocessed PVA biocomposites for food packaging applications.https://www.mdpi.com/1420-3049/30/2/372polyvinyl alcoholthermoprocessed compositesalmond shell celluloseradical scavengingoxygen barrierwater vapour permeability |
| spellingShingle | Irene Gil-Guillén Chelo González-Martínez Amparo Chiralt Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres Molecules polyvinyl alcohol thermoprocessed composites almond shell cellulose radical scavenging oxygen barrier water vapour permeability |
| title | Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres |
| title_full | Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres |
| title_fullStr | Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres |
| title_full_unstemmed | Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres |
| title_short | Influence of the Cellulose Purification Method on the Properties of PVA Composites with Almond Shell Fibres |
| title_sort | influence of the cellulose purification method on the properties of pva composites with almond shell fibres |
| topic | polyvinyl alcohol thermoprocessed composites almond shell cellulose radical scavenging oxygen barrier water vapour permeability |
| url | https://www.mdpi.com/1420-3049/30/2/372 |
| work_keys_str_mv | AT irenegilguillen influenceofthecellulosepurificationmethodonthepropertiesofpvacompositeswithalmondshellfibres AT chelogonzalezmartinez influenceofthecellulosepurificationmethodonthepropertiesofpvacompositeswithalmondshellfibres AT amparochiralt influenceofthecellulosepurificationmethodonthepropertiesofpvacompositeswithalmondshellfibres |