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
收藏
页码：11467 / 11471
页数：5
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