| 王艳艳,张帷,李超.包装箱用改性聚乙烯在干热气候中的老化行为[J].装备环境工程,2016,13(6):59-63. 王艳艳,张帷,李超.Degradation Behavior for Modified Polyethylene Used in Ammunition Packagingduring Dry-hot Weathering Aging[J].Equipment Environmental Engineering,2016,13(6):59-63. |
| 包装箱用改性聚乙烯在干热气候中的老化行为 |
| Degradation Behavior for Modified Polyethylene Used in Ammunition Packagingduring Dry-hot Weathering Aging |
| 投稿时间：2016-03-17 修订日期：2016-11-17 |
| DOI：10.7643/ issn.1672-9242.2016.06.011 |
| 中文关键词: 改性聚乙烯,塑料包装,大气曝晒老化,老化行为 |
| 英文关键词:modified polyethylene, plastics packaging, natural aging, degradation behavior |
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| 中文摘要: |
| 目的 研究包装箱用改性聚乙烯塑料在极端气候环境下的老化特征与规律。方法 在敦煌试验站对改性聚乙烯进行了为期36个月的自然老化试验,分析了缺口冲击强度的变化规律,采用扫描电镜、傅立叶红外光谱和凝胶色谱技术分析了样品曝晒面的显微形貌、微观结构以及分子量及其分布变化情况。结果 户外曝晒3个月时,样品表面出现大量连续裂纹,缺口冲击强度下降约40%,改性聚乙烯在干热环境下的老化以分子链的断链和氧化为主。结论 改性聚乙烯在干热气候中老化迅速,其包装制品在使用中应尽可能减少户外曝晒时间。 |
| 英文摘要: |
| Objective To study the aging profile of modified polyethylene used as ammunition packaging under the extreme conditions. Methods The nature exposure test was carried out for 36 months in Dunhuang test station. The changes of appearance, mechanical properties, microstructure, molecular weight and its distribution were monitored, by environmental scanning electron microscope, computer-controlled impact testing, Fourier transformation infrared spectrogram and gel permeation chromatography, to determine the degradation behavior. Results The impact strength reached 60% of original strength after 3months exposure, while cracks appeared on the exposed surfaces in abundance. The microcosmic analysis results showed the chain breaking and oxidation play a leading role in the aging progress. Conclusion The degradation rate of modified polyethylene is rapid in dry-hot environment, while the exposure time of packaging products should be reduced as short as possible. |
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