Surface segregation driven by molecular architecture asymmetry in polymer blends

被引：27

作者：

Lee, Jae Sik ^{[1
]}

Lee, Nam-Heui ^{[1
]}

Peri, Somesh ^{[1
]}

Foster, Mark D. ^{[1
]}

Majkrzak, Charles F. ^{[2
]}

Hu, Renfeng ^{[3
,4
]}

Wu, David T. ^{[3
,4
]}

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA

[2] NIST, Gaithersburg, MD 20899 USA

[3] Colorado Sch Mines, Dept Chem Engn, Golden, CO 80401 USA

[4] Colorado Sch Mines, Dept Chem, Golden, CO 80401 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 22期

关键词：

LINEAR-POLYMERS; FILM THICKNESS; ENRICHMENT; POLYSTYRENE; FIELD; TRANSITIONS; MIXTURES; WEIGHT; MODEL;

D O I：

10.1103/PhysRevLett.113.225702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The contributions of chain ends and branch points to surface segregation of long-branched chains in blends with linear chains have been studied using neutron reflectometry and surface-enhanced Raman spectroscopy for a series of novel, well-defined polystyrenes. A linear response theory accounting for the number and type of branch points and chain ends is consistent with surface excesses and composition profile decay lengths, and allows the first determination of branch point potentials. Surface excess is determined primarily by chain ends with branch points playing a secondary role.

引用

页数：5

共 31 条

[1] THE EFFECTS OF CONFINEMENT AND SURFACE INTERACTIONS ON COEXISTENCE IN A BINARY POLYMER MIXTURE [J].