ch 10 polymer gels n.
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Ch 10 Polymer gels - PowerPoint PPT Presentation


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Ch 10 Polymer gels. Physical. Chemical. Rheology of chemical gels. p; the fraction of bonds that are filled. Percolation; the process of network formation by random filling of bonds on a lattice, or by random filling of regions of space. Near equilibrium. for fully cured elastic solid.

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Physical

Chemical

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Rheology of chemical gels

p; the fraction of bonds that are filled

Percolation; the process of network formation by random filling of bonds on a lattice, or by random filling of regions of space

Near equilibrium

for fully cured elastic solid

At large deformation

Mooney-Rivlin equation

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Rheology of physical gels

Physical networks; sticker

Associating polymers; water soluble polymers with hydrophobic groups

Hydrophilic groups are associating; dipole-dipole interaction in ionomer, hydrogen bonding

Attractive interactions promote both gelation and phase separation

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Telechelic polymers

Linear polymers containing associating sticker groups only on the chain ends

HEUR; hydrophobically modified ethoxylated urethanes

Ordered cubic array of bridged micelles

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Entangled ‘sticky’ chains

Many stickers along the chain

HASE; hydrophobic alkali-swellable emulsion polymers

Shear thickening; caused by a shear-induced change in the balance between intramolecular and intermolecular associations

Shear induced gel formation at high shear rates