Unformatted text preview: 2 SO 4 , and consequentially restores cross-linking in PVA. This provides further evidence that an increase in viscosity occurs when there is cross-linking. The fact that the PVA mixture formed immediately after the addition of H 2 SO 4 was slightly more viscous than the original PVA mixture suggests that the H 2 SO 4 did not completely remove cross-linking that was formed by the borate ion solution. Also, the fact that the PVA mixture formed immediately after the addition of NaOH was slightly less viscous than the PVA mixture formed immediately after the borate ion solution was added suggests that the NaOH did not restore cross-linking to the extent of cross-linking induced by the borate ion solution....
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This note was uploaded on 01/31/2009 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell.
- Fall '05