Phase Separation at the Surface of Poly(ethylene oxide)-Containing Biodegradable Poly(L-lactic acid) Blends

被引：6

作者：

Yu, Jinxiang ^{[1
]}

Mahoney, Christine M. ^{[2
]}

Fahey, Albert J. ^{[2
]}

Hicks, Wesley L., Jr. ^{[3
]}

Hard, Robert ^{[4
]}

Bright, Frank V. ^{[1
]}

Gardella, Joseph A., Jr. ^{[1
]}

机构：

[1] SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA

[2] NIST, Analyt Microscopy Grp, Surface & Microanal Sci Div, Gaithersburg, MD 20899 USA

[3] Roswell Pk Canc Inst, Dept Head & Neck Surg, Buffalo, NY 14263 USA

[4] SUNY Buffalo, Dept Anat Cell Biol, Buffalo, NY 14214 USA

来源：

LANGMUIR | 2009年 / 25卷 / 19期

基金：

美国国家科学基金会;

关键词：

ION MASS-SPECTROMETRY; ELECTRON-SPECTROSCOPY; CHEMICAL-ANALYSIS; BLOCK-COPOLYMERS; POLY(IMIDESILOXANE) COPOLYMERS; DIMETHYLSILOXANE; FILMS; ADSORPTION; MORPHOLOGY; ADHESION;

D O I：

10.1021/la901239v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The surface chemistry and in-depth distribution of the composition of a poly(ethylene oxide) (PEO)-containing biodegradable poly(L-lactic acid) (PLLA) blend matrix system have been investigated using X-ray photoelectron spectroscopy (XPS). This study reports detailed quantitative compositional information using a novel numerical method for determining depth profiles. The PEO system studied is an amphiphilic Pluronic P104 surfactant, PEO-b-poly(propylene oxide) (PPO)-b-PEO. The extent of phase separation is analyzed by determining the surface enrichment of the PEO component via measurement of chemical composition at the polymer-air interface. For this blend system, the combination of the PPO component in the Pluronic surfactants drives the formation of a surface excess of Pluronic in the blends with PLLA. The surface excess profile shows a rapid increase in Pluronic surface composition versus bulk Pluronic mass fractions of 1-5%, but the profile levels off above bulk Pluronic mass fractions of 5%.

引用

页码：11467 / 11471

页数：5