Swollen state rubbery materials

From the organic point of view, reversible contraction/dilation phenomena should be observed in photochromic networks below their glass transition temperatures, i.e. in the rubbery state where segment mobility is important. Considering that isomerization occurs in the rubbery state at a rate similar to that in solution, it should be expected that the use of isomerization reactions for photocontractile behavior should be optimal with easily deformable networks, i.e. swollen gels and rubbery materials. 

In summary, many of the IPN applications do not depend on high modulus or impact resistance (but some do ) these materials often show their best properties in the leathery, rubbery, or swollen states. Thus, it is seen that the applications for... 

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