复合聚电解质凝胶的制备与性能研究 Ⅰ.表面性能对凝胶的影响

采用柱状灯芯技术(Column Wicking Technique)研究了三种不同阳离子的木质素磺酸盐(木质素磺酸钠、钙和镁)的表面性能,同时应用电导率测试法对聚丙烯酰胺(PAAM)/木质素磺酸盐聚电解质凝胶的形成过程进行了研究。结果表明:木质素磺酸钙具有最高的表面能,而木质素磺酸钠的表面能最低。结合对凝胶过程的研究进一步发现,相对于聚丙烯酰胺凝胶来说,加入木质素磺酸盐对聚电解质凝胶的体系的影响是非常明显的,即木质素磺酸盐表面能大,则所形成的凝胶的电导率就小。上述结论也在实验过程得到了验证,根据手感可发现,在三种木质素磺酸盐中,加入木质素磺酸钙所形成的聚电解质凝胶具有较好的致密性和较高的强度。

Fabrication and Studies of Polyelectrolyte Composite Gel and Properties Ⅰ. Effect of the Surface Properties on Gelation

In this paper,surface properties of three lignosulfonates with different cations,e.g.Na ,Ca2 and Mg2 ,were initially studied.Then,corresponding polyacrylamide(PAAM)/lignosulfonate composite gels were furthermore fabricated under a control by taking electric conductivity as a tool.Based on Column Wicking Technique,results showed that the calcium lignosulfonate has the highest surface free energy while the sodium lignosulfonate is the lowest.A further study of the gelation and taken polyacrylamide as a reference presented that the influence from the surface free energy of those lignosulfonates is visible and the conclusion seems to be that the higher the surface free energy of lignosulfonate,the lower is the conductivity of related composite gel.Evidently,experiments also support this result due to the hand feeling indicated the calcium lignosulfonate-based gel had higher density and intensity in comparing to other lignosulfonate-based composite gels.