壳聚糖的接枝改性及其CO2/N2响应乳化性能研究

通过化学反应将甲基丙烯酸二甲氨基乙酯(DMAEMA)接入壳聚糖(CTS)的分子结构中,获得改性产物CTS-gDMAEMA。使用红外光谱和核磁氢谱对其进行了结构表征。向CTS-g-DMAEMA的聚集体分散液中依次通入CO_2和N_2后,其外观形态、透光率和电导率发生了明显的循环变化,证实了CTS-g-DMAEMA的CO_2/N_2刺激响应性。水-液体石蜡的乳化实验证明,与原料CTS相比,CTS-g-DMAEMA具有更好的稳定乳液的能力;并且在CO_2/N_2作用下,由CTS-g-DMAEMA制备的乳液可以发生破乳和再乳化的循环。

Study on the modification of chitosan and its CO2/N2-switchable emulsification

2-(Dimethylamino) ethyl methacrylate (DMAEMA) was grafted onto the molecular structure of chitosan by chemical reaction. FT-IR and 1H NMR were used to characterize the structure of the modified product (CTS-g-DMAEMA). The appearance, conductivity and transmittance of the dispersion of CTS-g-DMAEMA aggregates are repeatedly changed in the stimulation of CO2 and N2, which shows the CO2/N2-switchable behavior of CTS-g-DMAEMA. The emulsification experiment of water-liquid paraffin illustrates that the CTS-g-DMAEMA shows better emulsification capability than the raw chitosan. Moreover, under the action of CO2/N2, the emulsion prepared by CTS-g-DMAEMA can be demulsified and re-emulsified circularly.