聚甲基丙烯酸缩水甘油酯疏水纳凝胶的制备与表征

采用乳液聚合法制备了聚甲基丙烯酸缩水甘油酯疏水纳凝胶。通过透射电子显微镜、傅里叶红外光谱和动态激光光散射等测试对其结构和形貌进行了表征，对疏水纳凝胶形成过程规律和对温度、pH和时间稳定性进行了考察，并探究了单体浓度、交联剂含量和乳化剂浓度对纳凝胶粒径的影响规律。结果表明：所得疏水纳凝胶具有粒径均一、分散稳定和溶胀性能好等优点。疏水纳凝胶粒径在一定温度和pH范围内无变化，在30天内粒径从76nm增至116nm，zeta电位随温度升高而增加，其值稳定在-90~-30mV之间，说明是一种较为稳定的凝胶体系。在实验范围内，纳凝胶粒径随单体甲基丙烯酸缩水甘油酯和交联剂二甲基丙烯酸乙二醇酯浓度的增加从80nm增至250nm，随乳化剂浓度增加从230nm降至60nm。

Preparation and characterization of poly(glycidyl methacrylate) hydrophobic nanogels

Poly(glycidyl methacrylate) hydrophobic nanogels were synthesized successfully via emulsion polymerization. The structure and morphology of the nanogels were characterized by transmission electron microscopy, fourier transform infrared microscopy and dynamic light scattering analysis. The formation process of hydrophobic nanogels and the stability of temperature, pH and time were investigated experimentally. The results showed that the obtained nanogels were spherical in shape with uniform sizes and had properties of dispersion stability and good swelling capacity. The average size of the nanogels was almost not influenced by the temperature and pH under the present conditions. The sizes of the nanogels increased from 76nm to 116nm within 30 days. The zeta potential of the nanogels increased with the increase of temperature. The stable values of the zeta potential in the range from -90mV to -30mV were observed, indicating that the present hydrophobic nanogels could be considered as a stable system. The sizes of the nanogels increased from 80nm to 250nm with the increase of the concentrations of the monomer glycidyl methacrylate and the cross-linker ethylene glycol dimethacrylate, and decreased from 230nm to 60nm with increasing surfactant concentration.