研究了马来酸酐(MAH)固相接枝微晶纤维素(MCC)的反应工艺,并通过红外光谱、X射线衍射对微晶纤维素及其接枝产物进行了对比表征.红外结果表明,接枝产物在1719.13 cm~(-1)处出现了酯基的伸缩振动吸收峰,可定性地说明马来酸酐与微晶纤维素发生了接枝反应.X射线衍射结果表明,接枝反应并没有改变微晶纤维素的结晶结构,仅使其结晶度下降.文中探讨了接枝反应温度、时间和MAH用量等因素对接枝取代度的影响.当马来酸酐与微晶纤维素质量比为8%,反应温度90℃,反应时间3 h,可得到取代度达0.1的马来酸酐接枝微晶纤维素.
The most abundant biomacromolecule, cellulose has attracted considerable attention in recent years due to its biodegradable, biocompatible and renewable characters, the grafting polymerization is one of the important modification of the cellulose. The solid phase grafting of maleic an hydride(MAH) onto microcrystalline cellulose (MCC) was studied. The structures of MCC and cellulose grafting maleic(MCC-g-MAH) were characterized by infrared spectrometer(FT-IR) and wide-angle X-ray diffraction(WAXD). The appearance of an absorption peak at 1720 cm~(-1) in purified MCC-g-MAH samples was attributed to C= O stretching vibrations of the earboxyl group in MAH, which demonstrated the success of grafting. The effect of reaction factors including reaction temperature, reaction time and the dosage of MAH used on the degree of substitution(DS) was investigated and the results show that a DS of 0.10 can be achieved when the molar ratio of methylmet hacrylate to microcrystalline cellulose is 0.1 : 10, reaction time and temperature is 3 hours and 90℃ respectively.
参考文献
| [1] | Structure-property relationship of all-cellulose composites[J].Composites science and technology,2009(7/8):1225-1230. |
| [2] | Li YX;Liu RG;Huang Y .Synthesis and phase transition of cellulose-graft-poly(ethylene glycol) copolymers[J].Journal of Applied Polymer Science,2008(3):1797-1803. |
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