Water Uptake in PHBV/Wollastonite Scaffolds: A Kinetics Study
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Production of PHBV/WOL Films
2.3. Production of PHBV/WOL Scaffolds
2.4. Characterization
2.4.1. X-ray Diffraction (XRD)
2.4.2. Zeta Potential
2.4.3. Field Emission Gun—Scanning Electron Microscopy (FEG-SEM) and Scanning Electron Microscopy (SEM)
2.4.4. Fourier Transform Infrared Spectroscopy (FT-IR)
2.4.5. Raman Spectroscopy
2.4.6. Contact Angle
2.4.7. Cell Viability
2.4.8. Water Uptake
3. Results
3.1. X-ray Diffraction
3.2. Zeta Potential
3.3. Field-Emission Scanning Electron Microscopy (FEG-SEM)
3.4. Raman Spectroscopy
3.5. FT-IR Spectroscopy
3.6. SEM Micrographs
3.7. Contact Angle
3.8. Cell Viability
3.9. Water Uptake
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Wollastonite | PHBV | ||
---|---|---|---|
cm−1 | Assignments | cm−1 | Assignments |
237, 337 | Ca-O Stretch | 678 | γC=O |
321, 337 | Ca-O Stretch | 693 | γC=O |
400, 412 | Ca-O Stretch | 840 | υC–COO |
485 | O-Si-O bend | 980 | rCH3, υC–C (C) |
581 | O-Si-O bend | 1220 | Helical conf. (C) |
636 | Si-O-Si bend | 1262 | Helical conf. (C) |
688 | Si-O-Si bend | 1364 | δCH, wCH2, δsCH3 |
883 | Si-O(br) stretch | 1380 | δsCH3 |
970 | Si-O(br) stretch | 1443/1458 | δCH2, δasCH3 (C) |
997 | Si-O(br) stretch | 1725 | υC=O (C) |
1020 | Si-O(br) stretch | ||
1044 | Si-O(br) stretch |
Wollastonite | PHBV | ||
---|---|---|---|
cm−1 | Assignments | cm−1 | Assignments |
~1640 | Bending water | 2975 | Symmetric stretching of CH3 group |
1092 | Streching bridging Si-O(Si) | 2937 | Asymmetric stretching of CH3 group |
1072 | 1725 | Carbonyl stretching (C=O) of PHBV | |
~960 | Si-OH | ||
985 | Streching non-bridging Si-O(Si) | 1500–900 | CH3 and CH vibrations and C-O-C and C-C stretching |
938 | |||
922 | |||
714 | Streching bridging Si-O(Si) |
Samples | Pseudo First-Order Model | Pseudo Second-Order Model | Interparticle Diffusion Model | |||||
---|---|---|---|---|---|---|---|---|
k1 (h−1) | qe | R2 | k2 (h−1) | qe | R2 | kin | R2 | |
PHBV | 1.25 × 10−3 | 408.65 | 0.96035 | 1.81 × 10−6 | 569.55 | 0.96707 | 9.39035 | 0.98374 |
PHBV/5%WOL | 1.25 × 10−3 | 478.60 | 0.98229 | 1.40 × 10−6 | 689.05 | 0.98547 | 11.1993 | 0.98809 |
PHBV/10%WOL | 1.68 × 10−3 | 578.22 | 0.99428 | 1.64 × 10−6 | 811.9 | 0.99381 | 15.26236 | 0.98577 |
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Ribas, R.G.; Montanheiro, T.L.A.; Montagna, L.S.; Prado, R.F.d.; Lemes, A.P.; Bastos Campos, T.M.; Thim, G.P. Water Uptake in PHBV/Wollastonite Scaffolds: A Kinetics Study. J. Compos. Sci. 2019, 3, 74. https://doi.org/10.3390/jcs3030074
Ribas RG, Montanheiro TLA, Montagna LS, Prado RFd, Lemes AP, Bastos Campos TM, Thim GP. Water Uptake in PHBV/Wollastonite Scaffolds: A Kinetics Study. Journal of Composites Science. 2019; 3(3):74. https://doi.org/10.3390/jcs3030074
Chicago/Turabian StyleRibas, Renata G., Thaís L. A. Montanheiro, Larissa S. Montagna, Renata Falchete do Prado, Ana Paula Lemes, Tiago M. Bastos Campos, and Gilmar P. Thim. 2019. "Water Uptake in PHBV/Wollastonite Scaffolds: A Kinetics Study" Journal of Composites Science 3, no. 3: 74. https://doi.org/10.3390/jcs3030074