The mechanism of polymer degradation by ultraviolet radiations is not agreed upon by experts.
关于紫外线辐射使聚合物降解的原理，专家们是有分歧的。
2
Upon exposure of the solid polymers to ultraviolet light the polymers tend leads to produce degradation or crosslinking.
在紫外光辐照下，高聚物的薄膜或纤维发生降解或交联反应。
3
Methods: Forced degradation testing was carried out at different concentration nifedipine solution while fluorescent lamp, ultraviolet lamp or daylight was employed.