Optical anisotropy and conformation of polyamidebenzimidazole in an organic solvent and in concentrated sulphuric acid
Optical anisotropy and conformation of polyamidebenzimidazole in an organic solvent and in concentrated sulphuric acid
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有机溶剂和浓硫酸中聚酰胺苯并咪唑的光学各向异性和构象
DOI：
10.1016/0014-3057(84)90085-5
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
N. Mikhailova
中科院分区：
文献类型：
--
作者：
I. N. Shtennikova;T. Peker;T. I. Garmonova;N. Mikhailova
对各种分子量范围内的聚酰胺苯并咪唑 (PABI) 和聚间苯二甲酰间苯二胺 (PPIP) 分子的流动双折射、固有取向和特性粘度进行了研究。比较了 PABI 分子在二甲基乙酰胺 (DMAA) 和浓硫酸中的光学和构象特性。 PABI（动力学刚性线圈）的构象在两种溶剂中几乎相同。这一事实表明，在硫酸中芳香族聚酰胺大分子的构象形成过程中，实际上不存在分子质子化的显着作用。比较了 PABI 和 PPIP 分子在硫酸和 DMAA 中的系数 G= [χ/g]RT/M[η]η0。 PABI 的 G 值是 0.65 ± 0.05，PPIP 的 G 值是 0.30 ± 0.03，分别对应于刚性和柔性高斯线圈的值。
Flow birefringence, intrinsic orientation and intrinsic viscosities of polyamidebenzimidazole (PABI) and poly-meta-phenylene-isophthalamide (PPIP) molecules have been studied for a wide range of molecular weights. The optical and conformational properties of PABI molecules in dimethyl acetamide (DMAA) and concentrated sulphuric acid are compared. The conformation of PABI (kinetically rigid coil) is shown to be practically the same in both solvents. This fact indicates the practical absence of a significant role of protonization of molecules during formation of conformation of aromatic polyamides macromolecules in sulphuric acid. There is comparison of the coefficientsG= [χ/g]RT/M[η]η0for PABI and PPIP molecules in sulphuric acid and DMAA. Values ofGof 0.65 ± 0.05 for PABI and 0.30 ± 0.03 for PPIP correspond to those for rigid and flexible Gaussian coils respectively.