在乙酸酐-氯化胆碱中实现木质素磺酸盐(LS)室温和高温条件下的乙酰化改性.研究了反应时间、氯化胆碱含量、乙酸酐/LS质量比对乙酰化取代度的影响.结果表明,在反应温度为120℃、反应时间为3 min、氯化胆碱含量为5％、乙酸酐/LS质量比为5/1时取代度最高.利用红外光谱、氢核磁共振波谱和热重分析对乙酰化LS进行了表征.测试表明,LS的醇羟基和酚羟基都发生了乙酰化反应,且乙酰化改性LS的热稳定性略有降低.
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