• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Effect of the thermal treatment of ionomer films on permeability and permselectivity
【24h】

Effect of the thermal treatment of ionomer films on permeability and permselectivity

机译：离聚物薄膜的热处理对磁导率和选择性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ionomers have been studied in detail and have gained widespread commercial use. Interested in altering the ratio of CO2/O-2 permeability (i.e., permselectivity) of films for use in packaging respiring produce, we pressed sodium-neutralized poly(ethylene methacrylic acid) ionomers into films at 120-160degreesC and investigated their thermal, morphological, and permeability properties. The heat treatment of the ionomers at 160 C increased the gas permeability for O-2 more than for CO2 and reduced the CO2/O-2 permselectivity ratio from 4.1 to 1.6. The reasons for these changes in the permeability characteristics of the ionomers are not understood but could be related to a reduction in the polyethylene (PE) crystallinity and the destruction of the aggregates into smaller, dispersed clusters. These results were supported by differential scanning calorimetry data and scanning electron micrographs. This suggests that the heat treatment of ethylene-methacyrlic ionomers may improve their potential for applications as selective barriers for modified-atmosphere packaging of respiring produce. (C) 2002 Wiley Periodicals, Inc. [References: 15]
机译：离聚物已被详细研究并已获得广泛的商业用途。为了改变用于包装呼吸产品的薄膜的CO2 / O-2渗透率（即渗透选择性）的比例，我们在120-160°C的温度下将钠中和的聚（乙烯甲基丙烯酸）离聚物压制成薄膜，并研究了其热，形态以及渗透性。离聚物在160℃下的热处理对O-2的透气性比对CO2的增加更多，并且将CO2 / O-2的渗透选择性比从4.1降低到1.6。离聚物的渗透性特征发生这些变化的原因尚不清楚，但可能与聚乙烯（PE）结晶度降低以及聚集体破坏成较小的分散簇有关。这些结果得到差示扫描量热数据和扫描电子显微照片的支持。这表明乙烯-甲基丙烯酸离聚物的热处理可能会提高其作为呼吸产品的改性大气包装的选择性屏障的应用潜力。 （C）2002 Wiley Periodicals，Inc. [参考：15]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号