Inverted Phases Induced by Chain Architecture in ABAC Tetrablock Terpolymers

被引：23

作者：

Bluemle, Michael J. ^{[1
]}

Zhang, Jingwen ^{[1
]}

Lodge, Timothy P. ^{[1
,2
]}

Bates, Frank S. ^{[1
]}

机构：

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

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

来源：

MACROMOLECULES | 2010年 / 43卷 / 10期

基金：

美国国家科学基金会;

关键词：

ABC-TRIBLOCK-COPOLYMERS; ORDER-DISORDER TRANSITION; BLOCK-COPOLYMERS; DIBLOCK COPOLYMERS; MOLECULAR-WEIGHT; MICELLE REGIME; MORPHOLOGY; POLYSTYRENE; BEHAVIOR; NETWORK;

D O I：

10.1021/ma100510p

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The bulk morphological behavior of a sequence of poly(styrene-b-isoprene-b- styrene-b-ethylene oxide) (SISO) terpolymers with fS ≅ f I and fO between 0 and 30%, was reported. Nine SISO tetrablocks were generated by the reinitiation and polymerization of ethylene oxide froma single batch of hydroxylterminated SIS copolymer. Molecular weights and polydispersities were determined by size exclusion chromatography. The block volume fractions were obtained by 1H NMR and are referenced to published homopolymer densities at 140°C. 0.5 wt % of BHT antioxidant was added to the block polymers prior to structural characterization. Morphological assignments were made by utilizing a combination of small-angle X-ray scattering (SAXS), dynamic mechanical spectroscopy (DMS), and transmission electron microscopy (TEM). The SAXS patterns produced by SISO tetrablocks are strikingly different than the other samples, each containing at least three well-defined scattering peaks.

引用

页码：4449 / 4452

页数：4

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