Microphase separation of diblock copolymer with MovingWalls
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Sociedade Brasileira de Física
2004
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| _version_ | 1876478907353399296 |
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| author | Antonio Daud |
| author_facet | Antonio Daud |
| contents | Microphase separation of diblock copolymer with MovingWalls Antonio Daud Flavio Moretti Morais Sílvia Martins Débora Coimbra Welles A. M. Morgado Física, Astronomía y Matemáticas Diblock copolymers are linear chain molecules consisting of two subchains A and B grafted covalently to eachother. Below some critical temperature Tc these two blocks tend to segregate, but due to the covalent bondthey can segregate at best locally to form periodic structures (microdomains). For molecules whose subchainshave the same length, the equilibrium pattern is lamellar. In the bulk regime, these microdomains are orderedat random. To obtain an oriented lamellar pattern it is necessary to consider some asymmetry. In the presenceof an external field, the lamellae will align to it. Directional quenching also can lead to the growth of orientedmicrophase separation. The effect of boundary conditions (confinement between parallel walls) also generateswell-aligned lamellae, parallel to the walls. If the distance between the walls is comparable to the molecularsizes, another constraint is imposed on the system since the domains are forced to accommodate between thewalls and, for certain conditions we will see a frustration phenomenon. If we allow the walls to move with acertain velocity during phase segregation, the accommodation of the lamellae can be changed. We use a celldynamical system, which is a very efficient computational method, in order to investigate the effect of movingwalls in lamellae formation. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434213 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2A Vol.34 |
| format | Artículo científico |
| id | redalyc_46434213 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Microphase separation of diblock copolymer with MovingWalls Antonio Daud Física, Astronomía y Matemáticas Microphase separation of diblock copolymer with MovingWalls Antonio Daud Flavio Moretti Morais Sílvia Martins Débora Coimbra Welles A. M. Morgado Física, Astronomía y Matemáticas Diblock copolymers are linear chain molecules consisting of two subchains A and B grafted covalently to eachother. Below some critical temperature Tc these two blocks tend to segregate, but due to the covalent bondthey can segregate at best locally to form periodic structures (microdomains). For molecules whose subchainshave the same length, the equilibrium pattern is lamellar. In the bulk regime, these microdomains are orderedat random. To obtain an oriented lamellar pattern it is necessary to consider some asymmetry. In the presenceof an external field, the lamellae will align to it. Directional quenching also can lead to the growth of orientedmicrophase separation. The effect of boundary conditions (confinement between parallel walls) also generateswell-aligned lamellae, parallel to the walls. If the distance between the walls is comparable to the molecularsizes, another constraint is imposed on the system since the domains are forced to accommodate between thewalls and, for certain conditions we will see a frustration phenomenon. If we allow the walls to move with acertain velocity during phase segregation, the accommodation of the lamellae can be changed. We use a celldynamical system, which is a very efficient computational method, in order to investigate the effect of movingwalls in lamellae formation. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434213 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2A Vol.34 |
| title | Microphase separation of diblock copolymer with MovingWalls |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46434213 |