以下为句子列表：
英文: By changing the contents of blowing agent and the inner size and changing the density distribution of structural polyurethane foam, the influences of the inner structure on the properties of gradient density polyurethane foam were investigated.
中文: 摘要通过改变发泡剂用量和采用不同密度泡沫组合，来改变聚氨酯结构泡沫整体的密度分布，研究了梯度密度聚氨酯泡沫塑料的性能。
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英文: Initators for free radical reactions. Blowing agent for elastomers and plastics.
中文: 自由基反应的引发剂，弹性体和塑料的发泡剂。
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英文: Use： Initators for free radical reactions. Blowing agent for elastomers and plastics.
中文: 用途：自由基反应的引发剂，弹性体和塑料的发泡剂。
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