Hydroxypropylcellulose-based liquid crystal materials
Hydroxypropyl cellulose is regarded distinctive cellulose derivative due to its unique properties and could display a lyotropic cholesteric liquid-crystalline phase in a variety solvents. This work deals with studying the role of cellulose- and carbon-based nanoparticles on liquid crystal performanc...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-12-01
|
| Series: | Carbohydrate Polymer Technologies and Applications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666893921000712 |
| _version_ | 1818873639368392704 |
|---|---|
| author | Altaf H. Basta Vivian F. Lotfy Jehane A. Micky Aya M. Salem |
| author_facet | Altaf H. Basta Vivian F. Lotfy Jehane A. Micky Aya M. Salem |
| author_sort | Altaf H. Basta |
| collection | DOAJ |
| description | Hydroxypropyl cellulose is regarded distinctive cellulose derivative due to its unique properties and could display a lyotropic cholesteric liquid-crystalline phase in a variety solvents. This work deals with studying the role of cellulose- and carbon-based nanoparticles on liquid crystal performance of modified hydroxypropyl cellulose (HPC) in lyotropic suspension and nanocomposite films in a comparison study. The lyotropic suspension of HPC and HPC-nanocomposites were characterized by rheological study and optical properties. The Fourier Transformed Infrared Spectroscopy (FTIR), X‐ray Diffractometry (XRD), Thermogravimetric Analysis (TGA), mechanical analysis, scanning electron microscope (SEM) and optical properties were the techniques used to characterize the nanocomposite films. The results showed that, introducing the cellulose and carbon nanoparticles lowered the critical concentration of lyotropic suspension of HPC from 30 wt.% to 26–28 wt.% and earlier appearance of anisotropic phases was occurred which evidenced by the rheological curves and optical properties. The FTIR, XRD and TGA of nanocomposite films showed no change in backbone chemical structure of HPC but the incorporation of nanoparticles, especially cellulose-based NPs, enhanced the crystallinity, thermal stability behaviour and mechanical properties. The behaviour of carbon-NPs in HPC film was unaccepted, where it deteriorated the mechanical properties. The nanocomposite films displayed good fingerprint texture (especially with cellulose nanocrystals) with moderated defined morphologies that promote the liquid crystal nanocomposite development. |
| first_indexed | 2024-12-19T12:57:54Z |
| format | Article |
| id | doaj.art-203d348dda4445cfa329dae43bd4b396 |
| institution | Directory Open Access Journal |
| issn | 2666-8939 |
| language | English |
| last_indexed | 2024-12-19T12:57:54Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Carbohydrate Polymer Technologies and Applications |
| spelling | doaj.art-203d348dda4445cfa329dae43bd4b3962022-12-21T20:20:21ZengElsevierCarbohydrate Polymer Technologies and Applications2666-89392021-12-012100103Hydroxypropylcellulose-based liquid crystal materialsAltaf H. Basta0Vivian F. Lotfy1Jehane A. Micky2Aya M. Salem3Cellulose and Paper Dept., National Research Centre, El-Buhooth Street, Dokki, 12622, Giza, Egypt; Corresponding author.Cellulose and Paper Dept., National Research Centre, El-Buhooth Street, Dokki, 12622, Giza, EgyptDepartment of Chemistry, Faculty of Science (Girl's), Al-Azhar University, Nasr City, Cairo, EgyptCellulose and Paper Dept., National Research Centre, El-Buhooth Street, Dokki, 12622, Giza, EgyptHydroxypropyl cellulose is regarded distinctive cellulose derivative due to its unique properties and could display a lyotropic cholesteric liquid-crystalline phase in a variety solvents. This work deals with studying the role of cellulose- and carbon-based nanoparticles on liquid crystal performance of modified hydroxypropyl cellulose (HPC) in lyotropic suspension and nanocomposite films in a comparison study. The lyotropic suspension of HPC and HPC-nanocomposites were characterized by rheological study and optical properties. The Fourier Transformed Infrared Spectroscopy (FTIR), X‐ray Diffractometry (XRD), Thermogravimetric Analysis (TGA), mechanical analysis, scanning electron microscope (SEM) and optical properties were the techniques used to characterize the nanocomposite films. The results showed that, introducing the cellulose and carbon nanoparticles lowered the critical concentration of lyotropic suspension of HPC from 30 wt.% to 26–28 wt.% and earlier appearance of anisotropic phases was occurred which evidenced by the rheological curves and optical properties. The FTIR, XRD and TGA of nanocomposite films showed no change in backbone chemical structure of HPC but the incorporation of nanoparticles, especially cellulose-based NPs, enhanced the crystallinity, thermal stability behaviour and mechanical properties. The behaviour of carbon-NPs in HPC film was unaccepted, where it deteriorated the mechanical properties. The nanocomposite films displayed good fingerprint texture (especially with cellulose nanocrystals) with moderated defined morphologies that promote the liquid crystal nanocomposite development.http://www.sciencedirect.com/science/article/pii/S2666893921000712Lyotropic liquid crystalline polymerHydroxypropyl cellulose (HPC)Cellulose-based nanoparticlesCarbon-based nanoparticlesRheologyCritical concentration |
| spellingShingle | Altaf H. Basta Vivian F. Lotfy Jehane A. Micky Aya M. Salem Hydroxypropylcellulose-based liquid crystal materials Carbohydrate Polymer Technologies and Applications Lyotropic liquid crystalline polymer Hydroxypropyl cellulose (HPC) Cellulose-based nanoparticles Carbon-based nanoparticles Rheology Critical concentration |
| title | Hydroxypropylcellulose-based liquid crystal materials |
| title_full | Hydroxypropylcellulose-based liquid crystal materials |
| title_fullStr | Hydroxypropylcellulose-based liquid crystal materials |
| title_full_unstemmed | Hydroxypropylcellulose-based liquid crystal materials |
| title_short | Hydroxypropylcellulose-based liquid crystal materials |
| title_sort | hydroxypropylcellulose based liquid crystal materials |
| topic | Lyotropic liquid crystalline polymer Hydroxypropyl cellulose (HPC) Cellulose-based nanoparticles Carbon-based nanoparticles Rheology Critical concentration |
| url | http://www.sciencedirect.com/science/article/pii/S2666893921000712 |
| work_keys_str_mv | AT altafhbasta hydroxypropylcellulosebasedliquidcrystalmaterials AT vivianflotfy hydroxypropylcellulosebasedliquidcrystalmaterials AT jehaneamicky hydroxypropylcellulosebasedliquidcrystalmaterials AT ayamsalem hydroxypropylcellulosebasedliquidcrystalmaterials |