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- W2360857564 abstract "PMMA prepared by microwave irradiation with KPS catalyst at 70 ℃ was confirmed to be atactic structure. The difference of syndiotactic content reveals the influence of microwave emulsifier free polymerization on the stereostructure of PMMA. The FT IR and 13 C NMR results reveal that polymerization accomplished by microwave will decrease the syndiotactic structure content in prepared PMMA, and so do the emulsifier free polymerization. Further calculation based on 13 C NMR data indicates that for emulsifier free polymerization, the continuous ratio( ρ ) is about 0.90 and the N (ad) probability values are closed to the predictive values by first order Makov model. We believe that such kind of results are ascribed to two facts: the agitating to monomer by microwave irradiation and the change of polymerizing environment. For microwave polymerization, microwave can agitate and accelerate the movement of high polarity monomer MMA, help it overcome the steric hindrance. This will promote the formation of more isotactic structure than traditional convection heating polymerization. In emulsifier free polymerization, the chain growth is accomplished directly in water not in micelle. The hydrogen bond interaction among H 2O, MMA and the end of growing chain can partially counteract the steric effect, leads to more formation of isotactic structure." @default.
- W2360857564 created "2016-06-24" @default.
- W2360857564 creator A5058115817 @default.
- W2360857564 date "2002-01-01" @default.
- W2360857564 modified "2023-09-25" @default.
- W2360857564 title "THE FT-IR AND ~(13)C-NMR STUDY OF STEREOSTURCTURE OF PMMA PREPARED BY MICROWAVE EMULSIFIER- FREE EMULSION POLYMERIZATION" @default.
- W2360857564 hasPublicationYear "2002" @default.
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