| 摘要 |
New mineral polymers called polysialates have the empiral formula Mn [-(Si-O2-)z-Al-O2-]n,wH2O where z is 1, 2 or 3, M is sodium, or sodium plus potassium, n is the degree of polycondensation, and w has a value up to about 7. The method for making these polymers includes heating an aqueous alkali silico-aluminate mixture having an oxide-mole ratio within certain specific ranges for a time sufficient to form the polymer.
|
