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.%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-g-DMAEMA.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CO2和N2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CO2/N2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CO2/N2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.
展开▼
