Dielectric Properties of Collagen on Plasma Modified Polyvinylidene Fluoride

Abstract

Problem statement:The attachment of biopolymers such as collagen on inert polymeric template created great challenge due to hydrophobic nature of polymeric material. The modification of PVDF for improved adhesion and introduction of specific functionalities have been widely recognized in various industrial applications. Typical methods for modifying polymer surface such as chemical etching and UV irradiation are not favorable as it requires high temperature and the use of chemical solvents. However plasma modification is suitable as it utilizes low heat and a clean environment, thus preventing contamination on the deposited collagen. Approach: Free standing orientated Poly (Vinylidene Fluoride) (PVDF) films were fabricated by solution casting method and dried in a convention oven. The dried PVDF films were orientated in a tensile machine at temperature 70°C enclosed in a custom made environmental chamber. The pulling rates of 5 mm min −1 were utilized with a draw ratio of 2 (R = L final /L initial ). The PVDF film was plasma treated for 60 sec to enhance the hydrophilic property of PVDF and utilized as template for collagen deposition. The deposited collagen on surface of PVDF was left in desiccators at temperature of 24°C for complete drying. Results: The untreated and plasma-treated PVDF template were observed for water contact angle measurement, the functional group and dielectric properties of collagen were observed and measured by FTIR and SOLARTRON respectively. Conclusion:The orientated PVDF films were produced at pulling speed of 5 mm min −1 and temperature of 70°C. The hydrophobic PVDF surface was transformed to a hydrophilic surface by plasma treatment for collagen deposition. The FTIR result shows the overlapping peaks of C-H and C-F in range 1500-1000 cm −1 which indicates the C-C bonding of collagen and PVDF. The significant increase in dielectric constant is a result from the favorable bonding between collagen and PVDF template.

Effect of Exposure Time on Plasma Modified Polyvinylidenefluoride-Trifluoroethylene (PVDF-TrFE) Film Surfaces

“…This phenomena occurred due to the source of argon plasma, which were implanted at energies high enough to break the functional group and produced these active sites. Hence, resulted in hydrophilic surfaces [1,[8][9]. The number of active sites increased with prolonged exposure times.…”

Ferroelectric Properties of Polyvinylidenefluoride-Trifluoroethylene (PVDF-TrFE) Annealed Thin Film

“…Parallel packing of β-phase conformation chain structure induced the molecular dipole to align in one direction in order to produce large spontaneous polarization. Furthermore, PVDF-TrFE have the ability to achieve favourable dielectric characteristic by performing additional treatments, such as annealing [14][15][16][17][18], stretching [8,[19][20], fillers incorporations [21][22][23] and other advance methods [20,24]. In the ferroelectric thin film fabrication, annealing process was used due to its simplicity.…”

Effect of Annealing Temperature on the Crystallinity, Morphology and Ferroelectric of Polyvinylidenefluoride-Trifluoroethylene (PVDF-TrFE) Thin Film

“…Parallel packing of β-phase conformation chain structure induced the molecular dipole to align in one direction in order to produce large spontaneous polarization. Furthermore, PVDF-TrFE has the ability to achieve enhanced dielectric characteristic by treatments, such as annealing [8][9][10][11][12], stretching [13][14][15], fillers incorporations [16][17][18] and other advance methods [15,19]. In the ferroelectric thin film fabrication, annealing process was used due to its simplicity.…”