MORPHOLOGY OF BLENDS OF ALPHA,OMEGA-DIAMINOPOLYSTYRENE WITH ALPHA,OMEGA-DICARBOXYPOLY(ETHYLENE OXIDE)

被引:34
作者
IWASAKI, K [1 ]
HIRAO, A [1 ]
NAKAHAMA, S [1 ]
机构
[1] TOKYO INST TECHNOL, FAC ENGN, DEPT POLYMER CHEM, MEGURO KU, TOKYO 152, JAPAN
关键词
D O I
10.1021/ma00060a048
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The morphology of blends of polystyrene (APS) with poly(ethylene oxide) (CPEO) having amino and carboxy groups at the respective chain ends was investigated by small-angle X-ray scattering (SAXS), transmission electron microscope (TEM), and scanning transmission microscope (SEM) measurements. SAXS measurement of films of equimolar APS/CPEO blends cast from preferential solvents for APS or good solvents for both telechelics showed the formation of a periodic structure where the period increased with the molecular weight of APS. Lamellar structures were observed by TEM in the cross section of the blend films and the period of the lamellar layer fairly agreed with those measured by SAXS. The layer structure was also clearly observed by SEM everywhere in the cross section of the fractured film, indicating that the interaction of the chain ends between APS and CPEO induced regular structure. Surface analysis of the blend by X-ray photoelectron spectroscopy also supported formation of the ordered structure near the surface. On the other hand, the APS/CPEO blend film cast from a nitromethane/THF mixture, a preferential solvent for poly(ethylene oxide), included significantly disordered structure. FT-IR spectra of the APS/CPEO blend showed that partial proton transfer occurred from the carboxy group of CPEO to the amino group of APS. After washing of the polymer blend film in cyclohexane at 40-degrees-C, the molar ratio of APS/CPEO in the insoluble part was measured by H-1 NMR, indicating that 35-70% of APS was bound to CPEO.
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页码:2126 / 2131
页数:6
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