Reference

Interaction between poly(N-vinylpyrrolidone) and poly(acrylic acid)s: influence of hydrogen and cupric ions on the adduct formation

Interaction between poly(N-vinylpyrrolidone) and poly(acrylic acid)s: influence of hydrogen and cupric ions on the adduct formation. Subramanian, R.; Natarajan, P. (Dep. Inorg. Chem., Univ. Madras, Madras 600 025, India). J.There are some reagents with their cas registry numbers 15158-11-9 and 25087-26-7 are used in this study. Polym. Sci., Polym. Chem. Ed., 22(2), 437-51 (English) 1984. CODEN: JPLCAT. ISSN: 0449-296X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Interpolymer adduct formation between poly(N-vinylpyrrolidone) (I) [9003-39-8] and poly(methacrylic acid) (II) [25087-26-7] is mainly due to H bonding. A simple turbidity measurement making use of a spectrophotofluorometer is described for the study of the interpolymer adduct formation. Adduct formation is enhanced in the presence of Cu(II) and is described by the empirical relation d[III]/d[I] = k ′ 104a[Cu(II)]a, where III is the interpolymer adduct and a and k are consts. Similar results were obtained for interpolymer adduct formation between poly(acrylic acid) (IV) [9003-01-4] and I. In the above expression, a signifies the influence of chelation on Cu(II)-IV/II-I-type complex formation and k is the extent of I-IV/II interaction. The enhancement of adduct formation in the presence of Cu(II) is greater in IV than in II. Turbidity and viscosity measurements further indicate that the influence of Cu(II) on interpolymer adduct formation between I and II or IV is greater for IV than II, as IV is a better chelating ligand. The extent of adduct formation is greater for I in the absence of Cu(II) ions due to hydrophobic interactions exerted by Me groups. .

Photochemical polymerization of N-vinylpyrrolidinone in different solvents

Photochemical polymerization of N-vinylpyrrolidinone in different solvents. Allaev, Zh.; Gafurov, B. L.; Rashidova, S. Sh. (Inst. Khim. Polim. 78-67-1 and 9003-39-8 are also occured in this study., Tashkent, USSR). Uzb. Khim. Zh., (6), 37-40 (Russian) 1983. CODEN: UZKZAC. ISSN: 0042-1707. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The kinetics was detd. of polymn. of N-vinylpyrrolidinone [88-12-0] in EtOH and dioxane initiated by photochem. decompn. (l = 365 nm) of AIBN [78-67-1]. The rate consts. of the primary reactions were detd. by using 4-hydroxy-2,2,6,6-tetramethylpiperidinyloxy inhibitor and the rotating sector method. The polymn. was of the ~1.5 order in the monomer and ~0.6 order in the initiator indicating participation of the monomer in the initiation and chain termination by both recombination and disproportionation. The propagation rate consts. in EtOH at 25 and 40° were 1.4 x 103 and 2.03 x 103 L/mol-s, and the termination rate consts. of these temps. were 5.50 ′ 108 and 3.50 ′ 108 L/mol-s. The corresponding values in dioxene were 1.23 ′ 103, 1.87 ′ 103, 3.4 ′ 108, and 3.20 ′ 108 L/mol-s. The obtained polymers [9003-39-8] had mol. wts. 30,000-57,000. .