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Copolymerization of methyl vinyl ketone with styrene in the presence of cobalt(II) nitrate
Author(s) -
Masuda Seizo,
Minagawa Keiji,
Tanaka Masami,
Asahi Yutaka
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910470128
Subject(s) - copolymer , styrene , methyl vinyl ketone , monomer , cobalt , polymer chemistry , reactivity (psychology) , chemistry , ketone , polymer , organic chemistry , catalysis , medicine , alternative medicine , pathology
Copolymerization of methyl vinyl ketone (MVK) with styrene was carried out at 50°C in the presence of cobalt(II) nitrate. The resulting monomer reactivity ratios decreased with an increasing concentration of the cobalt salt. This finding suggests that the metal salt participates in the propagation step of the copolymerization. Absolute copolymerization parameters were determined by assuming a three‐component system as free MVK (M 1 ), MVK complexed with cobalt(II) nitrate (M 2 ), and styrene (M 3 ): k 11 /k 12 = 0.184, k 11 /k 13 = 0.235, k 22 /k 21 = 7.18 × 10 −2 , k 22 /k 23 = 6.79 × 10 −4 , k 33 /k 31 = 0.380, and k 33 /k 32 = 2.77 × 10 −3 , and Q 2 = 19.65 and e 2 = 2.83. The complexed MVK monomer is more reactive to the polymer radical with the terminal styrene unit than the free MVK. Very small values for the monomer reactivity ratios, k 22 /k 23 and k 33 /k 32 , show the marked alternating tendency for the copolymerization of the complexed monomer with styrene. In practice, however, alternating copolymer could not be obtained because of the poor solubility of cobalt(II) nitrate.