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 Copolymers can undergo microphase separation

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AuteurMessage
jancancook
Ultimoz
Ultimoz


Nombre de messages : 671
Date d'inscription : 04/01/2011

MessageSujet: Copolymers can undergo microphase separation   Lun 7 Nov - 15:34

Copolymers can undergo microphase separation to form a diverse array of periodic nanostructures, as shown in the example of the styrene-butadiene-styrene block copolymer shown at right. Microphase separation can be understood by analogy to the phase separation between oil and water. Due to chemical incompatibility between the blocks, block copolymers undergo a similar phase separation. However, because the blocks are covalently bonded to each other, they cannot demix macroscopically as water and oil can, and so instead the blocks form nanometer-sized structures. Depending on the relative lengths of each block and the overall block topology of the polymer, many morphologies can be obtained, each its own phase of matter.



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