Abstract
Temperature-modulated thermomechanical analysis (TMA) is a technique which allows for separation of the temperature-dependent thermal expansion from the time and temperature-dependent creep or stress relaxation behavior. Extrusion during the cable production process may orient and stretch polymer chains which are rapidly cooled in water. Such frozen-in stresses might relax over a longer time period, or when the sample is heated up, the polymer chains are able to move back to their initial state. Using this method allows for measurement of both effects—irreversible stress relaxation and reversible thermal expansion—at the same time. Additionally, a reversible signal might be used for the determination of the coefficient of thermal expansion for different materials. This work compares polyethylene samples with and without frozen-in stresses measured on standard and temperature-modulated TMA.
Highlights
Optical cables and fibers are extremely sensitive to mechanical, thermal and environmental conditions, which can affect their optical performance
Temperature-modulated thermomechanical analysis (TMA) is a technique which allows for separation of the temperature-dependent thermal expansion from the time and temperature-dependent creep or stress relaxation behavior
Using this method allows for measurement of both effects—irreversible stress relaxation and reversible thermal expansion—at the same time
Summary
Optical cables and fibers are extremely sensitive to mechanical, thermal and environmental conditions, which can affect their optical performance. This work compares polyethylene samples with and without frozen-in stresses measured on standard and temperature-modulated TMA.
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