摘要
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3min、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。
Acetylation of lignosulfonate(LS)was performed in acetic anhydride-choline chloride solvent both at room and elevated temperature.The effects of reaction conditions,including reaction time,choline chloride dosage and the mass ratio of acetic anhydride/LS on degree of substitution(DS)were studied.The results show that the highest DS is obtained at 120℃for 3min with 5%choline chloride dosage and 5/1mass ratio of acetic anhydride/LS.The acetylated products were characterized by FT-IR,proton nuclear magnetic resonance spectroscopy(1 H-NMR)and thermogravimetry(TG).The results of these tests show that acetylation reaction at phenolic and aliphatic hydroxyl both occurred,and the thermal stability of acetylated LS decreases slightly upon chemical modification.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第1期164-169,共6页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(31170516)
中央高校基本科研业务费专项资金项目(DL12EB03)
