Suparno Satira

Poly (vinylidene fluoride) Thin Film Prepared by Roll Hot Press

Various methods have been developed in the manufacture of Poly (vinylidene fluoride) (PVDF) thin films such as coating, spreading, evaporation and calendaring. The method of making this film certainly has many advantages and disadvantages as in the case of operational processes and also the cost of the required treatment. In this paper, an alternative method to preparation of PVDF thin films has been done through the development calendaring method by using roll hot press. The advantages of roll hot press are simple in terms of operation and relative low cost. PVDF thin film has been produced for several temperatures of roll hot press with several different thicknesses. The PVDF thin films are characterized using X-Ray Diffraction and IR spectra. In addition to determine the surface resistivity are caried out using I-V meter. We found that an increase in β fraction of PVDF thin films with increasing temperature at fixed film thickness, while the surface resistivity of PVDF film are decreased. This shown that the piezoelectric property of PVDF films has been

Electric field poling 2G V/m to improve piezoelectricity of PVDF thin film

Polyvinylidene fluoride (PVDF) is a polymer with unique characteristics i.e. piezoelectric and ferrroelectric properties. Piezoelectric propertiesof PVDF are determined by the fraction of β-phase structure. Several optimization methods have been developed to improve the piezoelectric properties of PVDF. One of our research efforts is to improve the piezoelectricity of PVDF by electric poling with high electric field 2G V/m. The application of high electric field performed on PVDF films with a thickness of 1 1m. Each sample was made with a deep coating method, with annealing temperature 70°C-110°C. Based on the XRD characterization, we have obtained value of β-fraction of samples after poling are: 56%, 61%, 77%, 81% and 83%, respectively. Therefore, high electric field poling has been able to improve the piezoelectric properties of PVDF films. The PVDF with good piezoelectric properties are potential can did a tes for piezoelectric sensors and actuators devices.

Effect of mechanical treatment and fabrication temperature on piezoelectric properties of PVDF film

Piezoelectric properties are one of the electrical properties that will arise in case of mechanical disturbances. One of polymer that can produce the greatest piezoelectric properties is poly vinylidene fluoride (PVDF). Piezoelectric properties of PVDF can be improved by mechanical treatment on the varying film thickness and the temperature. PVDF film has produced by roll hot press tool. Furthermore, PVDF films were characterized by XRD, IR and I-V meter. We have been obtained an increase piezoelectric properties of PVDF films that characterized by increasing β fraction. We get β fraction was 63.63%, 66.35% and 71.60% for temperatures of 140, 150 and 160°C, respectively at film thickness of 13 µm. In addition, We have gained β fraction for the thickness of 15, 13 and 8 µm are 64.60%, 66.35% and 69.00%, respectively at temperature of 140°C. This is due to the increasing temperature and decreasing film thickness then more dipoles are oriented in PVDF films. These results indicate that mechanical treatment c...

Effect of roll hot press temperature on crystallite size of PVDF film

Fabrication PVDF films have been made using Hot Roll Press. Preparation of samples carried out for nine different temperatures. This condition is carried out to see the effect of Roll Hot Press temperature on the size of the crystallite of PVDF films. To obtain the diffraction pattern of sample characterization is performed using X-Ray Diffraction. Furthermore, from the diffraction pattern is obtained, the calculation to determine the crystallite size of the sample by using the Scherrer equation. From the experimental results and the calculation of crystallite sizes obtained for the samples with temperature 130 °C up to 170 °C respectively increased from 7.2 nm up to 20.54 nm. These results show that increasing temperatures will also increase the size of the crystallite of the sample. This happens because with the increasing temperature causes the higher the degree of crystallization of PVDF film sample is formed, so that the crystallite size also increases. This condition indicates that the specific volume or size of the crystals depends on the magnitude of the temperature as it has been studied by Nakagawa.

Preparation of PVDF film using deep coating method for biosensor transducer applied

Fabrication of PVDF films has been making using Deep Coating Machine. Preparation of samples carried out for three different solvent concentrations, five of different temperature and three different heating times. This condition is carried out to see the effect of its on piezoelectric properties of PVDF films. The piezoelectric properties like as β fraction are discussion focus in this paper. Piezoelectric properties of PVDF can be improved by solvent concentrations various, temperature and heating time. To obtain the diffraction pattern of sample characterization is performed using X-Ray Diffraction. The β fraction of PVDF films calculate from broadening pattern of X-Ray Diffraction.. Has been obtained an increase piezoelectric properties of PVDF films that characterized by increasing β fraction. Have been obtained β fraction increased 31 %, 39 % and 44.5% for solvent concentrations of 10%, 15% and 20%, respectively. For the heating temperature from 70 0C up to 1100C have been obtained β fraction 37%, 38%, 44%, 50% and 58% respectively. Furthermore for the heating times 10 minute, 20 minute and 30 minute the β fraction are 34%, 48% and 60%. These results indicate that PVDF film results using deep coating method is good. These indication shown as from the β fraction obtained. From the results of sample characterization is known that a good percentage of solvent was 20%, heating temperature 110°C and long heating time is 30 minutes.

Preliminary Study Of The Permeability Of Cement‐Resin Admixture For Water Storage

Admixtures of cement and polymer resin were prepared for water storage in an aquifer layer. Water to cement (w/c) ratio was in the range of 6/7 to 10/7 and the resin added was between 10 and 60 ml. Samples were formed in two ways: by injecting the admixture into a box of 80×60×60 cm3 with a pressure of 6 bar and by molding to fit a certain dimension based on the requirements of the standard measurement. It was found that the increase of water to cement ratio enhances the coefficient of permeability. In addition, the coefficient of permeability decreases with increasing the volume of resin. An attempt to make a relationship between the permeability and the porosity showed that a power law would hold. However, more data are required for confirming the power law.