水对离子选择电极膜影响的碳-13自旋晶格弛豫研究。

Carbon-13 spin-lattice relaxation studies of the effect of water on ion-selective electrode membranes.

作者信息

Chan A D, Harrison D J

机构信息

Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.

出版信息

Talanta. 1994 Jun;41(6):849-56. doi: 10.1016/0039-9140(94)e0010-o.

DOI:10.1016/0039-9140(94)e0010-o

PMID:18966009

Abstract

(13)C spin-lattice relaxation studies on bis(2-ethylhexyl) adipate (DOA) plasticized poly(vinylchloride) (PVC) membranes are reported for plasticization levels ranging from 25 to 100 wt% plasticizer. The interaction between DOA and PVC molecules in these membranes appears to involve an entrapment of the plasticizer molecule within the polymer matrix. This is based on the constancy of the characteristic segmental motions of the plasticizer chains throughout the concentration range studied. The segmental mobility of the plasticizer component is modified by water absorption in the membrane. The pattern of characteristic segmental motions of the plasticizer is altered, the effect depending on the amount of added salt in the membrane. The results show water has a weak influence on the microviscosity of the membrane matrix.

摘要

本文报道了对己二酸二（2-乙基己基）酯（DOA）增塑的聚氯乙烯（PVC）膜进行的(13)C 自旋-晶格弛豫研究，其中增塑剂含量范围为25至100 wt%。在这些膜中，DOA与PVC分子之间的相互作用似乎涉及增塑剂分子被截留在聚合物基质中。这是基于在所研究的整个浓度范围内增塑剂链特征性链段运动的恒定性得出的。膜中的吸水作用改变了增塑剂组分的链段迁移率。增塑剂特征性链段运动的模式发生了改变，其影响取决于膜中添加盐的量。结果表明，水对膜基质的微粘度影响较弱。