结果表明，紫外光的照射主要导致聚甲醛试样表面层发生晶体破坏和无定形部分分子链降解，内层则主要发生非晶区重整结晶；
The results showed that UV radiation mainly led to crystal destruction and molecular degradation on the surface and recrystallization on the interior part of the sample.
采用热重分析仪（TGA）对试样的热降解行为进行了分析。
The TGA analysis has also been used for evaluating the thermodegradation of the persent samples.
结果：试样体外降解的质量损耗率逐期增大；
结果：试样体外降解的质量损耗率逐期增大；
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