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采用反相微乳液聚合合成了具有化学和物理双网络结构的锂皂石复合聚合物纳米凝胶(HCPN),重点探讨了锂皂石用量对HCPN吸水速率、吸盐水率、凝胶强度、抗剪切性能、pH响应性和膨胀性的影响,并通过透射电镜(TEM)、XRD衍射对HCPN的形貌和结构进行表征。结果表明HCPN吸水360min左右基本达到平衡,平衡吸水率为67~103g/g。锂皂石的加入可以提高HCPN的凝胶强度和抗剪切性,当锂皂石用量为1.0%,HCPN吸水凝胶体的凝胶强度高达9.1Pa.s。XRD证实锂皂石的结晶结构转变为无定型结构,以纳米片层结构无规分布于聚合物凝胶基体中。TEM表明HCPN基本为球形,形状比较规整,粒径为30~65nm,平均粒径为43nm,HCPN的溶胀具有明显的pH响应性,吸水溶胀300min后粒径可增加到3~4μm。
Laponite composite polymer nanohybrids (HCPN) with double network structure were synthesized by reverse microemulsion polymerization. The effects of the amount of hectorite on HCPN water absorption, salt water absorption, gel strength, Shear properties, pH responsiveness and swellability. The morphology and structure of HCPN were characterized by transmission electron microscopy (TEM) and X-ray diffraction. The results showed that HCPN basically reached equilibrium after absorbing water for 360min, and the equilibrium water absorption was 67 ~ 103g / g. The addition of laponite improves the gel strength and shear resistance of HCPN. When the amount of hectorite is 1.0%, the gel strength of HCPN absorbent gels reaches 9.1 Pa.s. XRD confirmed that the crystalline structure of laponite transformed into an amorphous structure with random distribution of the nanosheet structure in the polymer gel matrix. TEM showed that the HCPN was spherical and the shape was regular. The particle size of HCPN was 30-65nm and the average particle size was 43nm. The swelling of HCPN had obvious pH responsiveness. The diameter of HCPN increased to 3 ~ 4μm after swelling for 300min.