In the formula (1), R1 represents benzyl group or phenoxy methyl and m represents monovalentcation.
式(1)中，R1表示苄基或苯氧甲基。M表示一价的阳离子。
2
The area occupied by the monovalent exchange cation in the lattice layer of the montmorillonite and the determination ways of layer charge are presented. The different ways are compared.