在对聚乙二醇（ PEG）进行冷热循环处理时，其超分子结构会发生某种相的转变，从而改变宏观性质而具有特殊的蓄热调温性能。
The ultra-molecule of polyethylene glycols(PEG)has some extent phase change after heating and cooling cycles. The change of macroscopical properties leads to special thermal activity.
结果表明：加工以后使应力重新分布和使残余应力降低或均匀化，冷热循环去应力处理效果很小。
The results indicated that after machining the stress is re arranged and the residual stress decreases; the effect of thermal cycle stress relief treatment is little.
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