...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Macromolecules >Effect of ionic binding on the self-diffusion of anionic dendrimers and hydrophilic polymers in aqueous systems as studied by pulsed gradient NMR techniques
【24h】

Effect of ionic binding on the self-diffusion of anionic dendrimers and hydrophilic polymers in aqueous systems as studied by pulsed gradient NMR techniques

机译：脉冲梯度NMR技术研究离子键对水性体系中阴离子树状大分子和亲水聚合物自扩散的影响

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pulsed gradient NMR techniques including diffusion-ordered NMR spectroscopy have been used to study the self-diffusion of three carboxylated dendrimers in aqueous solutions of neutral poly(vinyl alcohol) (PVA) and of cationic poly(allyl amine) (PAAm). The ionic interaction between the cationic PAAm network and the anionic dendrimers had the most significant effect on the diffusion of the dendrimers in the system. The self-diffusion coefficients of the dendrimers in PAAm were an order of magnitude lower than in PVA and more widely distributed, and the activation energy for the displacement of the dendrimers in PAAm was higher than that in PVA. The effects of the dendrimer size, polymer concentration, and temperature on the diffusion of the dendrimers have also been studied.
机译：脉冲梯度NMR技术（包括扩散有序NMR光谱）已用于研究中性聚乙烯醇（PVA）和阳离子聚烯丙基胺（PAAm）水溶液中三种羧化树状聚合物的自扩散。阳离子PAAm网络与阴离子树状聚合物之间的离子相互作用对树状聚合物在系统中的扩散影响最大。树枝状聚合物在PAAm中的自扩散系数比PVA中低一个数量级，并且分布更广泛，并且树枝状聚合物在PAAm中置换的活化能比PVA中的高。还研究了树枝状聚合物的大小，聚合物浓度和温度对树枝状聚合物扩散的影响。

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