由于高分子与溶剂分子大小相差悬殊,它們的热运动相距甚远,因此高聚物在室溫时的溶解过程往往需要很长的时间,在溶解时溶剂分子不断扩散和渗透进入高聚物,使高聚物体积膨大成为松软的凝胶,这过程一直进行到高分子以分子状态分散在溶剂中为止,达完全溶解。交联的高聚物在分子鏈之間以化学鍵的形式相互鍵合,形成三向的网状結构,它不能为溶剂所分散,但能吸收大量溶剂而溶胀,形成溶胀的条件与线型高分子形成溶液相同,溶胀的凝胶实际上是高聚物的浓溶液,具有显著的弹性行为,溶胀的交联高聚物固体积增大引起三向結构分子网的伸展,降低了交联点 Due to the large difference between polymer and solvent molecular sizes, their thermal motion is far apart. Therefore, the dissolution process of polymer at room temperature often takes a long time, and the solvent molecules are continuously diffused and infiltrated into the polymer during dissolution. So that the volume of polymer expansion into a soft gel, the process has been carried out until the molecular weight polymer molecules dispersed in the solvent up to complete dissolution. The cross-linked polymers are chemically bonded to each other between molecular chains to form a three-dimensional network, which can not be dispersed by a solvent but can absorb a large amount of solvent and swell to form swelling conditions and linear Polymer solution to form the same, the swollen gel is actually a concentrated solution of polymer, with significant elastic behavior, swollen crosslinked polymer solid volume increases caused by the three-dimensional structure of the molecular network stretching, reducing the crosslinking point