A possible mechanism for the substrate effect on hydrogel formation

Article Abstract:

A new method, electronic speckle pattern interferometry (ESPI), was first established to spatially and temporarily monitor the entire polymerization and gelation between a pair of separated substrates. Theoretical model describing relations between the substrate surface tension, the increment in the surface tension of the solution upon polymerization, and the predicted position of the interface show a reasonable agreement with the experimental data.

Surface chemistry, Surface tension, Gelation

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Determination of fracture energy of high strength double network hydrogels

Article Abstract:

The fracture energy G of double network (DN) gels that consists of poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as the first network and poly(acrylaminde) (PAAm) as the second network are measured by the tearing test, which is a function of the crack velocity V. The results indicate that the mechanism relating to a heterogeneous structure of the DN gel is convincing for the remarkable large values of G.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Sulfonic Acids, Acrylamides, Properties, Acrylamide, Speed, Velocity, Fracture (Materials)

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Heterogeneous polymerization of hydrogels on hydrophobic substrate

Article Abstract:

An interface appeared during the polymerization to form heterogeneous structures in the vicinity of the hydrophobic substrates when a hydrogel was polymerized from its vinyl monomer in water. This substrates effect was found to have a correlation with the surface tension of the hydrophobic surface.

Vinyl Chloride Monomer, Water chemistry, Monomers, Chemical properties, Hydrophobic effect

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