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Photoinduced Viscosity Changes of Polyesters Containing ortho-Hydroxyazo Groups

机译:含邻羟基偶氮基的聚酯的光致粘度变化

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摘要

The synthesis and photoinduced changes in viscosity of polyesters having ortho-hydroxyazo groups in the polymer backbone are described. Reversible photodecrease in viscosity was observed in all cases. Isomerization from trans to cis form is responsible for the photodecrease in viscpsity. The extended conformation in the trans form changes to the more compact cis form upon irradiation results in ultimate decrease in viscosity.
机译:描述了在聚合物主链中具有邻羟基偶氮基的聚酯的合成和光致粘度的变化。在所有情况下均观察到粘度可逆的光降低。从反式到顺式的异构化是导致粘度降低的原因。辐照后,反式形式的扩展构象变为更紧密的顺式形式,最终导致粘度降低。

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