Download e-book for kindle: Smart polymers by Igor Yu Galaev; Bo Mattiasson

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By Igor Yu Galaev; Bo Mattiasson

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3 × 10−6 mol⋅ml/g2, indicating Θconditions of the solution of aggregates. The values of the thermodynamic radius RT = (3A2M2/16πNA)1/3, estimated before (28 nm) and after (12 nm) the phase transition, indicate strong interactions for both random coils and aggregates of globules. It has been shown104 by combined SLS and DLS that conformational states of smart polymer (PNIPA) can be governed by the addition of a surfactant, sodium dodecyl sulfate (SDS). Three areas on the “temperature–surfactant concentration” phase diagram have been discovered wherein the polymer existed as globules, coils, or expanded coils.

It is interesting to note that a number of synthetic polymers have been reported to exhibit a lower critical solution temperature (LCST) in water. 1,2 However, the question is still open as to whether it is crucial to use the LCST polymers in bioseparation or whether the UCST polymers can also be used if they exhibit the transition point within a suitable temperature range. 42–44,46,92 On a practical level, this means that 1. The phase-separation temperature does not change within a wide range of polymer concentration.

Three areas on the “temperature–surfactant concentration” phase diagram have been discovered wherein the polymer existed as globules, coils, or expanded coils. This suggests that variations in temperature or surfactant concentration can initiate the following conformational transitions: globule-to-coil, globule-to-expanded coil, coil-toexpanded coil, and the corresponding reverse transitions. It is not straightforward how the conformational transformations of smart polymers in the course of phase transition may contribute to biotechnological implementations.

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