Rheological Evidence of Composition Fluctuations in an Unentangled Diblock Copolymer Melt near the Order-Disorder Transition

被引：15

作者：

Kennemur, Justin G. ^{[1
,2
]}

Hillmyer, Marc A. ^{[2
]}

Bates, Frank S. ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

[2] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

来源：

ACS MACRO LETTERS | 2013年 / 2卷 / 06期

关键词：

MICROPHASE SEPARATION TRANSITION; BLOCK CO-POLYMERS; VISCOELASTIC PROPERTIES; MOLECULAR-WEIGHT; TRACER DIFFUSION; SAXS ANALYSIS; DYNAMICS; STATE; TEMPERATURE; SCATTERING;

D O I：

10.1021/mz4001892

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Rheological and small-angle X-ray scattering (SAXS) measurements were conducted on a symmetric, low molar mass (M-n = 17.6 kg/mol), poly(tert-butylstyrene-block-methyl methacrylate) (PtBS-PMMA) diblock copolymer near the order-disorder transition temperature (T-ODT = 193 +/- 1 degrees C). Evidence of composition fluctuations is apparent in the low frequency elastic (G') and loss (G '') moduli and in the temperature dependence of the peak scattering intensity, I(q*), up to 50 degrees C above the T-ODT. These findings demonstrate that chain entanglements are not responsible for the well-documented fluctuation mode in the terminal viscoelastic regime of block copolymer melts.

引用

页码：496 / 500

页数：5

共 50 条

[1] DIFFUSIVE COMPOSITION PATTERN RELAXATION IN DISORDERED DIBLOCK COPOLYMER MELTS [J].

ANASTASIADIS, SH ;

FYTAS, G ;

VOGT, S ;

GERHARZ, B ;

FISCHER, EW .

EUROPHYSICS LETTERS, 1993, 22 (08) :619-624

[2]

Anastasiadis SH, 2000, CURR OPIN COLLOID IN, V5, P324

[3] Multiblock Polymers: Panacea or Pandora's Box? [J].

Bates, Frank S. ;

Hillmyer, Marc A. ;

Lodge, Timothy P. ;

Bates, Christopher M. ;

Delaney, Kris T. ;

Fredrickson, Glenn H. .

SCIENCE, 2012, 336 (6080) :434-440

[4] FLUCTUATION-INDUCED 1ST-ORDER TRANSITION OF AN ISOTROPIC SYSTEM TO A PERIODIC STATE [J].

BATES, FS ;

ROSEDALE, JH ;

FREDRICKSON, GH ;

GLINKA, CJ .

PHYSICAL REVIEW LETTERS, 1988, 61 (19) :2229-2232

[5] FLUCTUATION EFFECTS IN A SYMMETRIC DIBLOCK COPOLYMER NEAR THE ORDER-DISORDER TRANSITION [J].

BATES, FS ;

ROSEDALE, JH ;

FREDRICKSON, GH .

JOURNAL OF CHEMICAL PHYSICS, 1990, 92 (10) :6255-6270

[6] BLOCK COPOLYMERS NEAR THE MICROPHASE SEPARATION TRANSITION .2. LINEAR DYNAMIC MECHANICAL-PROPERTIES [J].

BATES, FS .

MACROMOLECULES, 1984, 17 (12) :2607-2613

[7] Block copolymers - Designer soft materials [J].

Bates, FS ;

Fredrickson, GH .

PHYSICS TODAY, 1999, 52 (02) :32-38

[8]

Brazovskii S., 1975, Soviet Journal of Experimental and Theoretical Physics, V41, P85, DOI DOI 10.1142/9789814317344_0016

[9] Molecular weight dependence of zero-shear viscosity of block copolymers in the disordered state [J].

Choi, S ;

Han, CD .

MACROMOLECULES, 2004, 37 (01) :215-225

[10] DIFFUSION IN BLOCK-COPOLYMER MELTS - THE DISORDERED REGION AND THE VICINITY OF THE ORDER-DISORDER TRANSITION [J].

DALVI, MC ;

LODGE, TP .

MACROMOLECULES, 1994, 27 (13) :3487-3492

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