The gel compositions as described herein, are less affected by changes in humidity, are readily formed into complex shapes, and can contain high loadings of the hydrophobic material, even when the material is not highly hydrophobic, and provide a more controlled release of the hydrophobic material. It is believed that the slow release is achieved by forming the gel to have a tight cross-linked network with small pore-size. The pore size is correlated to the average correlation length as measured using Small Angle X-Ray Scattering (SAXS). By limiting the average correlation length to less than 8 nm, preferably from 0.3 nm to 8 nm, more preferably from 0.3 nm to 4 nm, a long lasting release of the hydrophobic material is achieved, rather than a blooming effect, whereby the hydrophobic material is released in a short burst.
本文所述的凝胶组合物受湿度变化的影响较小,容易形成复杂的形状,即使疏
水性材料的疏
水性不高,也能含有较高的疏
水性材料,并能更有控制地释放疏
水性材料。据认为,缓释是通过使凝胶形成具有小孔径的紧密交联网络来实现的。孔隙大小与使用小角 X 射线散射(
SAXS)测量的平均相关长度相关。通过将平均相关长度限制在 8 nm 以下,最好是 0.3 nm 至 8 nm,更理想的是 0.3 nm 至 4 nm,可实现疏
水材料的持久释放,而不是产生开花效应,即疏
水材料在短时间内释放。