低取代羟乙基纤维素在碱溶剂中的溶解行为及其机制

doi:10.13475/j.fzxb.20180402906

Abstract

Abstract:

In order to improve the solubility of cellulose in NaOH solution, hydroxyethyl cellulose （HEC）with low molar substitution was prepared. The interactions between HEC (8%) and NaOH in solution were investigated by optical microscopy, nuclear magnetic resonance, dkfferential scanning calorimetry and transmission electron mecroscopy. The results show that at low temperatures (below 0 ℃) NaOH solvent combines with water molecules to form NaOH hydrates molecules with proper size and stable structure, which are bonded with hydroxy on HEC molecules to form HEC-NaOH-H₂O water association structure. HEC is gradually dissolved following with the breadage of intermolecular hydrogen bond of HKC. After etherification, the introduced hydrophilic side chains weakens the interactions between HEC molecules but strengthens interactions between HEC chains and NaOH hydrates molecules, enhancing the stability of association structure and promoting the dissolution of HEC solvent, the HEC is gradually dissolved and finally dispersed in the length of micronscale and the width around of 10-80 nm.

Key words: hydroxyethyl cellulose, polymer with low molar substitution, sodium hydroxide, dissolution behavior, dissolution mechanism

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Dissolution behavior and mechanism of hydroxyethyl cellulose with low molar substitution in alkali solvent

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