LIU Xiaoxuan, DENG Xianghua, ZHANG Ting, WU Guangguo. THE REACTIVITY RATIOS AND SEQUENCE-LENGTH DISTRIBUTION OF PHOTO-INDUCED COPOLYMERIZATION OF MA AND AATP IN SOLUTION[J]. Acta Polymerica Sinica, 2006,(1):118-123.
LIU Xiaoxuan, DENG Xianghua, ZHANG Ting, WU Guangguo. THE REACTIVITY RATIOS AND SEQUENCE-LENGTH DISTRIBUTION OF PHOTO-INDUCED COPOLYMERIZATION OF MA AND AATP IN SOLUTION[J]. Acta Polymerica Sinica, 2006,(1):118-123.DOI:
The photo-induced eopotymerization of methyl acrylate(MA
M1)and 4-acrylamido-2
2
6
6- tetramethyl—piperidine(AATP
M2)in pyridine solutions was studied.The composition of MA and AATP copolymers was determined with1H-NMR method.According to the composition of poly(MA—CO—AATP)
the reactivity ratios of MA/AATP copolymerization system were calculated as 0.88121=0.90 and r2=0.50 by the extended Kelen-Tudos method.The results showed that the reactivity ratios of both MA and AATP monomer were less than 1
as r12f1=0.73.On the basis of the reactivity ratios of two monomers
the sequence-length distribution in the MA/AATP copolymers was obtained.Forf2=O.7
the probability of the MA sequence of 1 unit in the copolymer chain is 80.0%
the monomer unit of MA is mostly separated by the sequence of AATP;and for f2=0.5
the alternating tendency prevails and a large number of mono—sequences are formed;and in the case of f2=0.1
the probability of the AATP sequence of 1 unit in the eopolymer chain is 95.0%
the monomer unit of AATP is individually separated in tlle chain of MA.