Surface enrichment in polymer blends involving hydrogen bonding

被引:36
作者
Duan, YZ
Pearce, EM
Kwei, TK
Hu, XS
Rafailovich, M
Sokolov, J
Zhou, KG
Schwarz, S
机构
[1] Polytech Univ, Dept Chem & Chem Engn, Brooklyn, NY 11201 USA
[2] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA
[3] CUNY Queens Coll, Dept Phys, Flushing, NY 11367 USA
关键词
D O I
10.1021/ma002093a
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A phenolic polysiloxane, poly(4-ethenylphenolmethylsiloxane) (PEPS), that contains the phenolic hydroxyl group as a hydrogen-bond donor has been synthesized via hydrosilylation followed by hydrolysis. It was blended with a number of hydrogen-bond acceptors of different strengths, including poly(4-vinylpyridine) (PVPy) (strong), poly(vinylpyrrolidione) (PVPr) (strong), poly(dimethylacrylamide) (PDMA) (moderate), and poly(styrene-co-acrylonitrile) (PSAN) (weak). All blends were miscible in the bulk, as indicated by a single DSC T-g, and were shown to be homogeneous by optical microscopy. XPS measurements demonstrated that all PEPS blends had surface enrichment in PEPS, which has a lower surface energy. AFM images showed that the surface morphology in PVPy/PEPS, PVPr/PEPS, and PDMA/PEPS blends did not differ from that in the bulk, whereas the PSAN/PEPS blend exhibited a different surface structure that consisted of PSAN covered with a thin layer of PEPS. Depth profiling by SIMS was in agreement with the XPS analysis. The results indicated that (1) surface enrichment in hydrogen-bonding polymer blends is governed by the interplay between the difference in the surface energy of the constituents and the bulk thermodynamics and (2) hydrogen-bonding interactions reduce surface enrichment.
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收藏
页码:6761 / 6767
页数:7
相关论文
共 22 条
[1]  
ANDRADE JD, 1985, SURFACE CHEM PHYSICS
[2]   PREFERENTIAL SURFACE-ADSORPTION IN MISCIBLE BLENDS OF POLYSTYRENE AND POLYVINYL METHYL-ETHER) [J].
BHATIA, QS ;
PAN, DH ;
KOBERSTEIN, JT .
MACROMOLECULES, 1988, 21 (07) :2166-2175
[4]   SURFACE STUDIES OF POLYMER BLENDS .4. AN ESCA, IR, AND DSC STUDY OF THE EFFECT OF HOMOPOLYMER MOLECULAR-WEIGHT ON CRYSTALLINITY AND MISCIBILITY OF POLY(EPSILON-CAPROLACTONE) POLY(VINYL CHLORIDE) HOMOPOLYMER BLENDS [J].
CLARK, MB ;
BURKHARDT, CA ;
GARDELLA, JA .
MACROMOLECULES, 1991, 24 (03) :799-805
[5]  
Clarson S. J., 1993, Siloxane Polymers
[6]  
COHEN MS, 1989, J CHEM PHYS, V90, P10
[7]  
Coleman M. M., 1991, SPECIFIC INTERACTION
[8]   FOURIER-TRANSFORM INFRARED-SPECTROSCOPY - PROBING THE STRUCTURE OF MULTICOMPONENT POLYMER BLENDS [J].
COLEMAN, MM ;
PAINTER, PC .
APPLIED SPECTROSCOPY REVIEWS, 1984, 20 (3-4) :255-346
[9]  
DEFAY R, 1951, SURFACE TENSION ADSO
[10]   Determination of contact angles: Consistency between experiment and theory [J].
El Ghzaoui, A .
JOURNAL OF APPLIED PHYSICS, 1999, 86 (05) :2920-2922