Ms.
Abstract
In this study, we hypothesized that the solubility of CO2 in high density Polyethylene (HDPE) can be obtained from the dielectric constants of the mixture, and developed a new fixture for capacitance measurements. To calculate dielectric constants, the capacitance of pure gas and polymer matrix are first determined at 180 ℃ and given high pressures. Then, we determined the capacitance of the fully saturated mixture. CO2 was chosen as the gas because it is an environmentally benign blowing agent with relatively a high solubility in various polymers, and is widely used in the polymer industry. High density Polyethylene (HDPE) was chosen as the polymer matrix since it can dissolve a larger amount of CO2 compared to other polymers. Results showed that the change in CO2 solubility calculated by capacitance of the mixture with varying pressures had a similar trend to the literature data. This indicated that there was a relationship between a dissolved amount of CO2 and the dielectric constants of the mixture.
Ms.
In this study, we hypothesized that the solubility of CO2 in high density Polyethylene (HDPE) can be obtained from the dielectric constants of the mixture, and developed a new fixture for capacitance measurements. To calculate dielectric constants, the capacitance of pure gas and polymer matrix are first determined at 180 ℃ and given high pressures. Then, we determined the capacitance of the fully saturated mixture. CO2 was chosen as the gas because it is an environmentally benign blowing agent with relatively a high solubility in various polymers, and is widely used in the polymer industry. High density Polyethylene (HDPE) was chosen as the polymer matrix since it can dissolve a larger amount of CO2 compared to other polymers. Results showed that the change in CO2 solubility calculated by capacitance of the mixture with varying pressures had a similar trend to the literature data. This indicated that there was a relationship between a dissolved amount of CO2 and the dielectric constants of the mixture.