Conformational study on thin films of symmetric A(n)B(2n)A(n) triblock copolymer
文献类型：期刊论文
| 作者 | Nie, ZH; Su, ZH; Sun, ZY; Shi, TF; An, LJ |
| 刊名 | MACROMOLECULAR THEORY AND SIMULATIONS
 |
| 出版日期 | 2005-10-11 |
| 卷号 | 14期号:8页码:463-473 |
| 关键词 | Conformation Monte Carlo Simulation Order-disordered Transition Triblock Copolymer Thin Film |
| ISSN号 | 1022-1344 |
| DOI | 10.1002/mats.200500042 |
| 英文摘要 | The behavior of symmetric A(n)B(2n)A(n) triblock copolymer films confined between two hard neutral walls was explored by Monte Carlo simulation. The thicknesses of the films were between approximate to 1R(g0) and approximate to 7R(g0), where R-g0 is the unperturbed radius of gyration in the bulk. The confinement leads to a lamellar structure normal to the wall and the order-disorder transition (ODT) temperature was found to be a function of film thickness. When the film thickness (0) was less than a critical value, D-C, which is between 3R(g0) and 4R(g0), the ODT temperature (T*(ODT)) reduced by chain length N (T*(ODT)/N) decreased with decreasing film thickness. However, T*(ODT)/N was nearly independent of the film thickness when it was greater than D-C. In the case of strong confinement (D < D-C), the B block shrinks along the direction perpendicular to the wall and stretches along the direction parallel to the wall with decreasing film thickness, and the volume occupied by the B block shrinks. Under weak confinement conditions (D > D-C), the volume of the B block is nearly independent of film thickness. The conformations of the B block in the disordered state are quite different from those in the lamellae. If the film is thick enough, the volume of the B block approaches its value in the unperturbed state, regardless of the morphology. When temperature decreases, the B block stretches in the direction perpendicular to the A/B interface and shrinks in the other two directions. In addition, decreasing the temperature leads to the chains adopting two main extreme conformations, coiling or stretching as much as they can. The scaling behavior of the fraction of bridge chains vs. the temperature obtained in the weak segregation limit was different from that predicted in the strong segregation limit. |
| 语种 | 英语 |
| WOS记录号 | WOS:000233003500001 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/57653]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Shi, TF |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Nie, ZH,Su, ZH,Sun, ZY,et al. Conformational study on thin films of symmetric A(n)B(2n)A(n) triblock copolymer[J]. MACROMOLECULAR THEORY AND SIMULATIONS,2005,14(8):463-473. |
| APA | Nie, ZH,Su, ZH,Sun, ZY,Shi, TF,&An, LJ.(2005).Conformational study on thin films of symmetric A(n)B(2n)A(n) triblock copolymer.MACROMOLECULAR THEORY AND SIMULATIONS,14(8),463-473. |
| MLA | Nie, ZH,et al."Conformational study on thin films of symmetric A(n)B(2n)A(n) triblock copolymer".MACROMOLECULAR THEORY AND SIMULATIONS 14.8(2005):463-473. |
入库方式： OAI收割
来源：化学研究所
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