疏水修飾的高分子與界面活性劑的系統在工業上有許多應用。因此，兩者之間的交互作用越來越受到重視。本實驗探討的系統是非離子型高分子 (疏水改質羥乙基纖維素) 與非離子型界面活性劑 (Tergitol 15-S-5) 間的交互作用。實驗分成兩部分，第一部分為羥乙基纖維素與月桂醯氯經由酯化反應後作疏水性改質。第二部分為探討疏水改質羥乙基纖維素在加入Tergitol 15-S-5之後，對黏度、活化能、粒徑的影響，來了解兩者交互作用的行為，並且將實驗結果與文獻所提的交互作用機制相比較，驗證文獻中所提的交互作用機制是否可以通用於本系統。

Hydrophobically modified polymer and surfactant system have been applied in industry many years. So, interaction between hydrophobically modified polymer and surfactant has attracted growing attention. In this experiment, we study the interaction between nonionic polymer (hydrophobically modified hydroxyethyl cellulose) and nonionic surfactant (Tergitol 15-S-5). The first step in my experiment is preparation of hydrophobically modified hydroxyethyl cellulose with lauroyl chloride. The second step in my experiment is to discuss interaction between hydrophobically modified hydroxyethyl cellulose and Tergitol 15-S-5 and to compare my results with literatures. We observe interaction with viscosity (η)、dissociation energy (Em)、hydrodynamic radius (RH).

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