The Gelation of Polyvinyl Alcohol with Borax
The Gelation of Polyvinyl Alcohol with Borax
The Gelation of Polyvinyl Alcohol with Borax
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<strong>The</strong> <strong>Gelation</strong> <strong>of</strong> <strong>Polyvinyl</strong><strong>Alcohol</strong> <strong>with</strong> <strong>Borax</strong>Jeff MaciborskiTony Salamone5/1/01Instructor – Dr. Marand
<strong>Gelation</strong> Synthesis• Polymerization <strong>of</strong> vinyl acetate• Hydrolysis <strong>of</strong> poly(vinyl acetate)
<strong>Gelation</strong> Synthesis• Boric Acid – Borate Buffer• <strong>Gelation</strong> <strong>of</strong> Poly(vinyl alcohol)
PVA – <strong>Borax</strong> Gel Characteristics• Water Soluble• Gel able to form at very low soluteconcentrations• Network structure responsible for “slime”like properties-Tetrafunctional cross-links-Reformable hydrogen bonds
• <strong>The</strong>rmoreversible versuspermanent• <strong>The</strong>rmoreversible gelstransform from solidliketo liquid-like format a characteristic temp• Permanent gels madefrom solvent saturatedcovalently bondedpolymer networks.• Other cross-linkingmechanisms:Gel Properties
SLIME LAB• Add two or three drops <strong>of</strong> food coloring to boraxsolution (cup A)• Mix thoroughly <strong>with</strong> proper laboratory agitationutensil (a.k.a. pop-sickle stick)• Pour PVA solution (cup B), followed by borax/foodcoloring solution into Wall-Mart brand plastic bags.Be extremely careful in handling bags.• Shake vigorously until mixture thickens• Remove gel from bag; proceed <strong>with</strong> the tomfoolery• Do not eat or place in any parts <strong>of</strong> the body whereretrieval might be difficult
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