期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 133, 期 16, 页码 -出版社
WILEY
DOI: 10.1002/app.43327
关键词
functionalization of polymers; structure-property relations; surfaces and interfaces; thermal properties
资金
- National Natural Science Foundation of China [51103135]
- Zhejiang Provincial Natural Science Foundation of China [Y4100534]
- Zhejiang Provincial Pandeng Plan of China [pd2013129]
The cyclotrimerization of methylene diphenyl 4,4-diisocyanate (MDI) and 3-isopropenyl-,-dimethylbenzene isocyanate (TMI) was applied on the bead/membrane surfaces of a polypropylene (PP)-bearing isocyanate group to synthesize a protective networked polymer. Chemical structures of these molecules were characterized through attenuated total reflectance-Fourier transform infrared spectroscopy. Results showed that the absorption peak of isocyanate group at 2255 cm(-1) became negligible after the reaction was completed. The absorption peaks of the isocyanurate groups appeared simultaneously at 1600 cm(-1) and at 1510-1560 cm(-1); this result indicated that the grafted isocyanates were almost consumed, thereby forming isocyanurates. Energy X-ray dispersive spectroscopy revealed that oxygen content increased; indeed, isocyanurate was formed on the PP surface. Pure PP beads, PP-g-TMI, and cyclotrimerization products were also subjected to thermal property tests to investigate their corresponding thermal stabilities. Cyclotrimerization could result in the increase in PP-grafted decomposition temperature, even slightly higher than pure PP. Rheological behavior in oscillatory flow was also evaluated; the storage modulus, loss modulus, and complex viscosity of cyclotrimerization products were higher than those of the PP-grafted membranes. Surface morphology was further observed through field-emission scanning electron microscopy and atomic force microscopy. The cyclotrimerization products contained blocks and exhibited a rough surface. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43327.
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