中华纸业
中華紙業
중화지업
CHINA PULP & PAPER INDUSTRY
2013年
2期
40-43
,共4页
郑雪%姜彤彤%宋舒苹%蒲俊文%吕卫军
鄭雪%薑彤彤%宋舒蘋%蒲俊文%呂衛軍
정설%강동동%송서평%포준문%려위군
壳聚糖%N,O-羧甲基壳聚糖%取代度%FTIR%TGA
殼聚糖%N,O-羧甲基殼聚糖%取代度%FTIR%TGA
각취당%N,O-최갑기각취당%취대도%FTIR%TGA
chitosan%N, O-carboxymethyl chitosan%substitution degree%FTIR%TGA
壳聚糖和氯乙酸反应,在低碱浓的条件下合成了水溶性较好的总取代度高、N位取代度低的N,O-羧甲基壳聚糖,并采用单因素实验优化了制备条件,结果表明:当反应温度为90℃,壳聚糖与氯乙酸质量比为1∶4时,制备的N,O-羧甲基壳聚糖的取代度为1.567.用红外光谱(FTIR)和热重分析(TGA)对N,O-羧甲基壳聚糖进行了结构表征,发现N,O-羧甲基壳聚糖的N位和O位均引入了羧甲基,但改性后N,O-羧甲基壳聚糖的热稳定性比壳聚糖差,热分解温度比壳聚糖低.
殼聚糖和氯乙痠反應,在低堿濃的條件下閤成瞭水溶性較好的總取代度高、N位取代度低的N,O-羧甲基殼聚糖,併採用單因素實驗優化瞭製備條件,結果錶明:噹反應溫度為90℃,殼聚糖與氯乙痠質量比為1∶4時,製備的N,O-羧甲基殼聚糖的取代度為1.567.用紅外光譜(FTIR)和熱重分析(TGA)對N,O-羧甲基殼聚糖進行瞭結構錶徵,髮現N,O-羧甲基殼聚糖的N位和O位均引入瞭羧甲基,但改性後N,O-羧甲基殼聚糖的熱穩定性比殼聚糖差,熱分解溫度比殼聚糖低.
각취당화록을산반응,재저감농적조건하합성료수용성교호적총취대도고、N위취대도저적N,O-최갑기각취당,병채용단인소실험우화료제비조건,결과표명:당반응온도위90℃,각취당여록을산질량비위1∶4시,제비적N,O-최갑기각취당적취대도위1.567.용홍외광보(FTIR)화열중분석(TGA)대N,O-최갑기각취당진행료결구표정,발현N,O-최갑기각취당적N위화O위균인입료최갑기,단개성후N,O-최갑기각취당적열은정성비각취당차,열분해온도비각취당저.
N, O-Carboxymethyl chitosan with better water-solubility, high total substitution degree and low N substitution degree was synthesized by modifying chitosan with chloroacetic acid under low alkali concentration. Single factor experiments were used to optimize the preparation conditions, and the results showed that the substitution degree of N, O-Carboxymethyl chitosan is 1.566 when the temperature is 90℃ and the mass ratio of chitosan to chloroacetic acid is 1:4. The structure of N,O-carboxymethyl chitosan was characterized by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The results show that the substitution reaction occurred on both N element and O element, but the thermostability of N, O-carboxymethy chitosan is worse than chitosan and thermal decomposition temperature is lower than chitosan.
