...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Polymers for advanced technologies >Optimization of organo-layered double hydroxide dispersion in LDPE-based nanocomposites
【24h】

Optimization of organo-layered double hydroxide dispersion in LDPE-based nanocomposites

机译：LDPE基纳米复合材料中有机层双氢氧化物分散体的优化

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

Low-density polyethylene/layered double hydroxide (LDPE/LDH) nanocomposites were prepared via melt extrusion using organo-LDH particles and maleic anhydride functionalized polyethylene as compatibilizer. Processing parameters, preparation method, and feed composition were properly modulated until obtaining nanocomposites with intercalated/exfoliated morphologies, and an uniform distribution of nanolayers, as evidenced by X-ray diffraction and transmission electron microscopy analysis. These materials showed a significant improvement of the thermal- oxidative stability, which increased of about 50℃ during the first step of the degradation process. Moreover, a remarkable reduction of the oxygen permeability, proportional to the aspect ratio of LDH stacks dispersed in the polyolefin matrix was evidenced, indicating the possible application of nanocomposite films as food packaging materials. As highlighted by dynamic mechanical thermal analysis, interactions at the interface between LDH layers and polymer chains caused a shift of the LDPE β-relaxation toward higher temperatures and a reduction of the peak intensity with respect to the matrix. It was also found that the storage modulus of the nanocomposites was lower in all the temperature range with respect to the reference samples. Finally, on-line capillary rheometer measurements evidenced that the shear thinning behavior of the nanocomposites was dominated by the matrix so that the melt processability was not compromised by the presence of the filler.
机译：低密度聚乙烯/层状双氢氧化物（LDPE / LDH）纳米复合材料是通过熔融挤出制备的，使用有机LDH颗粒和马来酸酐官能化的聚乙烯作为增容剂。适当调节加工参数，制备方法和进料组成，直到获得具有插层/剥落形态，纳米层均匀分布的纳米复合材料为止，这可以通过X射线衍射和透射电子显微镜分析得到证明。这些材料显示出热氧化稳定性的显着提高，在降解过程的第一步中，热氧化稳定性提高了约50℃。而且，证明了与分散在聚烯烃基体中的LDH叠层的纵横比成比例的透氧性显着降低，表明纳米复合膜可以用作食品包装材料。如动态机械热分析所强调的，LDH层与聚合物链之间的界面处的相互作用导致LDPEβ弛豫向更高的温度移动，并且相对于基质降低了峰强度。还发现相对于参考样品，纳米复合材料的储能模量在所有温度范围内都较低。最后，在线毛细管流变仪的测量结果表明，纳米复合材料的剪切稀化行为受基质支配，因此填料的存在不会损害熔体的加工性能。

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