The gelation process entails formation of a borate ester that cross links the chains of the PVA.[2] Borate esters form readily by condensation of hydroxyl groups and the B-OH groups.[3]
The individual polymer chains are bound together by weak hydrogen bonds. The resulting polymer network is composed of strands of polyvinyl alcohol held together side-by-side by the borate molecules. It is evident that this cross linking is weak because of the ease with which the slime flows and pulls apart. However, even though this cross linking is weak, it does alter the properties of the resulting polymer.[4]
Structure for borate ester that comprises crosslinking in "slime".
Properties
Flubber is a non-Newtonian fluid that flows under low stress, but breaks under higher stresses and pressures. This combination of fluid-like and solid-like properties makes it a Maxwell fluid. Its behavior can also be described as being viscoplastic or gelatinous.[citation needed]
^Cassassa, E. Z.; A. M. Sarquis; C. H. Van Dyke (January 1986). "The Gelation of Polyvinyl Alcohol with Borax". Journal of Chemical Education. 63 (1): 57. doi:10.1021/ed063p57. S2CID94114885.
^Katoa, Y.; K. Suwaa; S. Yokoyamab; T. Yabeb; H. Ikutaa; Y. Uchimotoa; M. Wakihara (December 2002). "Thermally stable solid polymer electrolyte containing borate ester groups for lithium secondary battery". Solid State Ionics. 152–153: 155–159. doi:10.1016/s0167-2738(02)00370-3.
