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CuCl2 |
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聚乙二醇 |
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配位结构 |
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构象 |
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结晶 |
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郭振福 |
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Article by Guo, Z. F. |
用傅里叶变换红外光谱法(FT-IR)、差示扫描量热法(DSC)、广角 X射线衍射法(WAXD)研究了少量过渡金属盐氯化铜(CuCl2)对聚乙二醇(PEG)构象和结晶行为的影响. Cu2＋与PEG分子链中的氧原子有配位键生成, 通过溶液电导率的测定, 发现一个Cu2＋大约与3个PEG链节单元形成配位结构, 从而使PEG的构象和结晶行为发生变化, 随着体系中CuCl2含量的增加, PEG分子链中OC—CO旁式构象相对反式构象含量逐渐增加, 在CuCl2含量(w)为7%左右时达到极大值, 在CuCl2含量(w)为9%时, 反而是反式构象相对旁式构象含量多些. 混合物中PEG的结晶度随着体系中CuCl2含量的增加逐渐降低, 含量(w)为9%时, 又有所提高.
The effect of CuCl2 on the conformation at changes and crystallization behavior of PEG was studied by using FT-IR, DSC and WAXD. The Cu2＋ and the oxygen atoms of PEG molecular chain have formed coordination bond. By an electrical conductivity method it was found that one Cu2＋ and three PEG chain units formed one coordination structure, which caused the change of conformation and crystallization behavior of PEG. With the increase of the content of CuCl2 in the complexes, the amount of the gauche conformation relative to the trans conformation of PEG crystal increased. When the content of the CuCl2 was about 7% (w), the gauche conformation reached maximum. When the content of the CuCl2 was about 9% (w), the amount of the trans conformation relative to the gauche conformation of PEG crystal increased. With the increase of the content of CuCl2, the crystallinity of PEG in the complexes decreased. When the content of CuCl2 was about 9% (w), the crystallinity increased again.