Nanoscale Mixing of Soft Solids

被引：6

作者：

Choi, Soo-Hyung ^{[1
]}

Lee, Sangwoo ^{[1
]}

Soto, Haidy E. ^{[3
]}

Lodge, Timothy P. ^{[1
,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

[3] Univ Texas Pan Amer, Dept Mech Engn, Edinburg, TX 78541 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 06期

基金：

美国国家科学基金会;

关键词：

ANGLE NEUTRON-SCATTERING; BLOCK-COPOLYMER MELTS; CHAIN CONFORMATION; POLYMER; DIFFRACTION; SYSTEMS; SANS;

D O I：

10.1021/ja110871b

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

Assessing the state of mixing on the molecular scale in soft solids is challenging. Concentrated solutions of micelles formed by self-assembly of polystyrene-block-poly(ethylene-alt-propylene) (PS-PEP) diblock copolymers in squalane (C(30)H(62)) adopt a body-centered cubic (bcc) lattice, with glassy PS cores. Utilizing small-angle neutron scattering (SANS) and isotopic labeling (1)H and (2)H (D) polystyrene blocks) in a contrast-matching solvent (a mixture of squalane and perdeuterated squalane), we demonstrate quantitatively the remarkable fact that a commercial mixer can create completely random mixtures of micelles with either normal, PS(H), or deuterium-labeled, PS(D), cores on a well-defined bcc lattice. The resulting SANS intensity is quantitatively modeled by the form factor of a single spherical core. These results demonstrate both the possibility of achieving complete nanoscale mixing in a soft solid and the use of SANS to quantify the randomness.

引用

页码：1722 / 1725

页数：4

共 23 条

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Bacon G. E., 1975, NEUTRON DIFFRACTION

[2]

SINGLE-CHAIN SCATTERING IN HETEROGENEOUS BLOCK CO-POLYMERS [J].