THE MICROPHASE SEPARATION TRANSITION IN SYMMETRICAL DIBLOCK COPOLYMER MELTS - A MONTE-CARLO STUDY

被引:203
作者
FRIED, H [1 ]
BINDER, K [1 ]
机构
[1] MAX PLANCK INST POLYMER RES,W-6500 MAINZ,GERMANY
关键词
D O I
10.1063/1.460067
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We use Monte Carlo methods to study a lattice model of a dense melt of symmetric diblock copolymers. The calculations are performed in three dimensions using a slithering snake algorithm. In this work we present results for temperatures at and above the microphase separation transition (MST). The location of the MST is found through a study of the relaxation time associated with lamellar compositional fluctuations. A range of copolymer chain lengths are studied, and from our results, approximate scaling relationships are established. A collective length scale characterizing the compositional fluctuations is found which results from a nontrivial compositional mesostructure. At infinite temperature (athermal conditions), the copolymers exhibit the expected Gaussian conformational behavior. We find, however, that at finite temperatures, the copolymers exhibit non-Gaussian behavior indicative of a stretched or elongated state. The magnitude of this stretching, and hence of the deviation from Gaussian behavior, is found to increase as the temperature decreases towards the MST.
引用
收藏
页码:8349 / 8366
页数:18
相关论文
共 29 条
  • [1] GAUSSIAN-COIL TO STRETCHED-COIL TRANSITION IN BLOCK COPOLYMER MELTS
    ALMDAL, K
    ROSEDALE, JH
    BATES, FS
    WIGNALL, GD
    FREDRICKSON, GH
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (09) : 1112 - 1115
  • [2] FLUCTUATION-INDUCED 1ST-ORDER TRANSITION OF AN ISOTROPIC SYSTEM TO A PERIODIC STATE
    BATES, FS
    ROSEDALE, JH
    FREDRICKSON, GH
    GLINKA, CJ
    [J]. PHYSICAL REVIEW LETTERS, 1988, 61 (19) : 2229 - 2232
  • [3] FLUCTUATION EFFECTS IN A SYMMETRIC DIBLOCK COPOLYMER NEAR THE ORDER-DISORDER TRANSITION
    BATES, FS
    ROSEDALE, JH
    FREDRICKSON, GH
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1990, 92 (10) : 6255 - 6270
  • [4] BLOCK COPOLYMER THERMODYNAMICS - THEORY AND EXPERIMENT
    BATES, FS
    FREDRICKSON, GH
    [J]. ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 1990, 41 (01) : 525 - 557
  • [5] DYNAMICS OF PHASE-SEPARATION AND CRITICAL PHENOMENA IN POLYMER MIXTURES
    BINDER, K
    [J]. COLLOID AND POLYMER SCIENCE, 1987, 265 (04) : 273 - 288
  • [6] Binder K., 1979, MONTE CARLO METHODS, P204, DOI [10.1007/978-3-642-96483-1, DOI 10.1007/978-3-642-96483-1]
  • [7] BRAZOVSKII SA, 1975, ZH EKSP TEOR FIZ, V41, P85
  • [8] BROWN RA, 1989, COMPREHENSIVE POLYM, P155
  • [9] de Gennes P.-G, 1979, SCALING CONCEPTS POL
  • [10] Flory P. J., 1953, PRINCIPLES POLYM CHE