The steric effect of solvent molecules in the dissolution of polyacrylonitrile from five different N,N-dimethylformamide derivatives as studied using Raman spectroscopy

被引：18

作者：

Minagawa, M ^{[1
]}

Takasu, T ^{[1
]}

Morita, T ^{[1
]}

Shirai, H ^{[1
]}

Fujikura, Y ^{[1
]}

Kameda, Y ^{[1
]}

机构：

[1] YAMAGATA UNIV,FAC SCI,DEPT CHEM,YAMAGATA 990,JAPAN

来源：

POLYMER | 1996年 / 37卷 / 03期

关键词：

polyacrylonitrile; dissolution temperature; N; N-dimethylformamide derivatives;

D O I：

10.1016/0032-3861(96)82916-8

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The steric effect of solvent molecules in the dissolution of polyacrylonitrile (PAN) from five different kinds of N,N-dimethylformamide (DMF) derivatives was studied using Raman spectroscopy and a laboratory constructed laser optical instrument. The dissolution behavior of PAN from solvents such as DMF, N,N-dimethylacetamide, N,N-diethylformamide, N,N-dimethylcarbamylchloride, and N,N-dimethyltrichloroacetamide was studied with the laser optical method. Raman spectra of the solvents and solutions provided significant information on the intermolecular interaction between nitrile and the solvents (i.e., dipole-dipole interaction). The carbonyl band in each solvent shifted from a lower to a higher frequency when nitriles were added, and the extent of the shift was directly related to the structure and geometry of a subtituent in each solvent molecule. An inverse linear relationship between the value of the dissolution temperature (T-sol) and the extent of the Raman carbonyl shift is demonstrated. It seems reasonable to explain this in terms of the steric effect of solvent molecules in the dissolution of PAN.

引用

页码：463 / 467

页数：5

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