We have used the positron as a microscopic probe to clarify the connection between the microscopic properties (e.g., free volume distributions) and macroscopic properties (pressure, volume, and temperature relations) of polymers in the glassy state. Measurements of the positron lifetime distribution in the polymer as a function of temperature, aging, and applied strain have shown that positrons are sensitive to the distribution of free volume elements. However, we have also ...
Reports by Author
