X-ray spectromicroscopy of immiscible polymer blends: polystyrene-poly(methyl methacrylate)

被引:60
作者
Morin, C
Ikeura-Sekiguchi, H
Tyliszczak, T
Cornelius, R
Brash, JL
Hitchcock, AP
Scholl, A
Nolting, F
Appel, G
Winesett, DA
Kaznacheyev, K
Ade, H
机构
[1] McMaster Univ, Dept Chem, BIMR, Hamilton, ON L8S 4M1, Canada
[2] Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA
[3] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA
基金
加拿大自然科学与工程研究理事会; 美国国家科学基金会;
关键词
soft X-ray microscopy; NEXAFS; DS; PMMA; polymer blends; phase segregation; quantitative chemical mapping;
D O I
10.1016/S0368-2048(01)00335-8
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
Spun cast thin films of blends of low and high molecular weight mono-disperse polystyrene (PS) and poly(methyl methacrylate) (PMMA) with nominal compositions ranging from 66/33 wt.%/wt.% (w/w) up to 10/90 w/w PS/PMMA have been studied, as-made and after annealing. Two synchrotron-based X-ray microscopies - scanning transmission X-ray microscopy (STXM) and X-ray photoemission electron microscopy (X-PEEM) - as well as several variants of atomic force microscopy (AFM) were used to probe the composition and morphology of the bulk and surface of these blends. The chemical sensitivities and spatial resolutions of these three techniques are compared. All samples are observed to have a PS signal in the C Is X-ray absorption spectrum of the surface of the PMMA-rich domains as measured in the X-PEEM. A continuous thin PS laver is not expected at a PMMA surface since neither polymer should wet the other at thermodynamic equilibrium, The likely origin of this PS surface signal is from a bimodal distribution of PS domain sizes with the PS signal arising from domains at the surface which are smaller than the similar to 200-nm resolution of the X-PEEM. High resolution AFM and STXM provide direct evidence for this explanation. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:203 / 224
页数:22
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