Structure and Dynamics of Zinc-Neutralized Sulfonated Polystyrene Ionomers

被引：69

作者：

Castagna, Alicia M. ^{[2
]}

Wang, Wenqin ^{[1
]}

Winey, Karen I. ^{[1
]}

Runt, James ^{[2
]}

机构：

[1] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

来源：

MACROMOLECULES | 2011年 / 44卷 / 08期

关键词：

X-RAY-SCATTERING; BAND DIELECTRIC-SPECTROSCOPY; ACID CO-POLYMERS; VISCOELASTIC BEHAVIOR; RECONCILING STEM; MORPHOLOGY; COPOLYMERS; SPECTRA; SALTS; SIZE;

D O I：

10.1021/ma2001614

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理];

摘要：

Scanning transmission electron microscopy (STEM), X-ray scattering, and dielectric relaxation spectroscopy were used to investigate the structure and dynamics of Zn-neutralized sulfonated polystyrene (SI'S) ionomers. STEM and X-ray scattering revealed the presence of spherical aggregates similar to 2 nm in diameter. Successful fitting of scattering data to the Kinning - Thomas modified hard sphere model. provided information on aggregate diameter, radius of closest approach, and number density. The analysis revealed that aggregate size is independent of degree of sulfonation and neutralization level, and that aggregate composition becomes increasingly ionic with increasing neutralization. Two segmental relaxations were identified in dielectric loss spectra corresponding to cooperative motion of chain segments in the matrix and motions of segments restricted by aggregates. Additionally, a Maxwell-Wagner-Sillars interfacial polarization process was revealed, with relaxation times in good agreement with predictions from a simple spherical polarization model.

引用

页码：2791 / 2798

页数：8

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