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.
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页码：496 / 500
页数：5
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