STUDY OF THE MONOMER REACTIVITY RATIOS AND THE SEQUENCE DISTRIBUTION IN BUTADIENE-ISOPRENE COPOLYMERS BY 13C-NMR SPECTROMETRY
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STUDY OF THE MONOMER REACTIVITY RATIOS AND THE SEQUENCE DISTRIBUTION IN BUTADIENE-ISOPRENE COPOLYMERS BY 13C-NMR SPECTROMETRY
Acta Polymerica SinicaIssue 1, Pages: 77-83(1991)
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Published:20 February 1991,
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GUO Chun-ling, ZHOU Zin-an, GONG Zhi. STUDY OF THE MONOMER REACTIVITY RATIOS AND THE SEQUENCE DISTRIBUTION IN BUTADIENE-ISOPRENE COPOLYMERS BY 13C-NMR SPECTROMETRY. [J]. Acta Polymerica Sinica (1):77-83(1991)
DOI:
GUO Chun-ling, ZHOU Zin-an, GONG Zhi. STUDY OF THE MONOMER REACTIVITY RATIOS AND THE SEQUENCE DISTRIBUTION IN BUTADIENE-ISOPRENE COPOLYMERS BY 13C-NMR SPECTROMETRY. [J]. Acta Polymerica Sinica (1):77-83(1991)DOI:
STUDY OF THE MONOMER REACTIVITY RATIOS AND THE SEQUENCE DISTRIBUTION IN BUTADIENE-ISOPRENE COPOLYMERS BY 13C-NMR SPECTROMETRY
Butadiene and isoprene copolymers are prepared with Nd(naph)3-Al(i-Bu)3-Al2Et3Cl3.sub catalytic system in bulk and solution polymerization.The sequence structures of the copolymers are determined by 13C-NMR spectrometry. The dyad distribution
composition and number-average sequence length of these copolymers are calculated on the basis of assignment of 13C-NMR spectra. Meanwhile
the monomer reactivity ratios are obtained by using TUDOS' method which is proper to various copolymerization systems even at high conver-sions. The results of calculations are discussed. It is known that the sequence distribution of monomer units in all copolymers follows first-order Markov statistical model.