This suggests that the self-stiffening is not the result of chemical changes in the polymer, which can usually be undone by heat.
这说明材料强度提高并不是聚合物发生化学反应造成的，一般这种变化在加热状态下是可逆的。
3
In a new insulation being developed by EPRI, nanoparticles sensitive to this shift heat up and melt surrounding polymer molecules, forming a fresh protective scar.