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nature : it refers to a transparent polymer by the stress state in the optical birefringence a phenomenon. Generally there are two types of cases : (a) when the removal of foreign forces, birefringence phenomenon that is disappearing, said temporary birefringence; (2) when heated to above the glass transition temperature load imposed again, the load remain the same under the slowly cooling to room temperature, then remove the load. At this time, when the effect of high-temperature stress were frozen, so that the material has a permanent phenomenon of birefringence. With polarizing microscope compensator can be accurately measured strain birefringence. Commonly used to measure products by annealing treatment, the internal stress to improve the situation.
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