Studies on the polymerization of styrene using p‐bromophenacyl dimethyl sulfonium ylide as chain transfer agent

Vasishtha, Rita; Srivastava, Archana

doi:10.1002/actp.1989.010400514

Cited by 9 publications

(4 citation statements)

References 14 publications

(2 reference statements)

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“…The value of the rate constant ratio (k 2 p /k t ), determined from the slope of the linear plot of 1/M v vs. R p /[M] 2 is 0.50 × 10 −2 l mol −1 s −1 (Fig. 3), which matches with the value given in the literature [18].…”

Section: Effect Of Initiator Concentrationmentioning

confidence: 60%

“…A search of the literature reveals that benzoyl peroxide [14], azobisisobutyronitrile [14,15], 60 Co γ -radiation [15] and cumene hydroperoxide [16] have been used as an initiator for the polymerization of N-vinyl pyrrolidone (N-VP). However, no ylide has been used as an initiator for the polymerization of N-VP, although N [17] and S [18] ylides have been used as chain-transfer agent in the presence of azobisisobutyronitrile as an initiator for the polymerization of N-VP.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of poly(N-vinyl pyrrolidone) initiated by stibonium ylide

Srivastava¹,

Srivastava²

2006

Designed Monomers and Polymers

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1,2,3,4-Tetraphenylcyclopentadiene triphenyl stibonium ylide initiated radical polymerization of N-vinyl pyrrolidone (N-VP) in dioxane, at 60±0.2 • C, for 60 min under nitrogen atmosphere has been carried out. The system follows ideal kinetics, i.e., R p ∝ [ylide] 0.5 [N-VP] 1.0 . The values of k 2 p /k t and overall energy of activation have been computed as 0.5 × 10 −2 l mol −1 s −1 and 33 kJ/mol, respectively. The FT-IR spectrum shows a band at 1692 cm −1 due to the C O group of N-vinyl pyrrolidone. The 1 H-NMR spectrum shows multiplet at 2.4 δ ppm and a doublet at 3.7 δ ppm due to CH 2 protons. The DSC curve shows a glass transition temperature (T g ) as 48 • C.The presence of six hyperfine lines in the ESR spectrum indicates that the system follows free radical polymerization and the initiation is brought about by phenyl radical.

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Section: Effect Of Initiator Concentrationmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(N-vinyl pyrrolidone) initiated by stibonium ylide

Srivastava¹,

Srivastava²

2006

Designed Monomers and Polymers

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“…The properties of ylides are very dependent on the identity of the heteroatoms. 2 A literature survey has shown copolymerizations of methyl acrylate (MA) with styrene, 3 5-ethyl-2-vinyl pyridine, 4 and acrylonitrile 5 and copolymerizations of 4-vinyl pyridine (4-VP) with methyl methacrylate 6 and styrene 7 with imidazolium-p-chlorophenacylide, 3 azobisisobutyronitrile, 4,5 and b-picolinium-p-chlorophenacylide 6,7 used as radical initiators.…”

Section: Copolymerizationmentioning

confidence: 99%

Kinetics and mechanism of the radical copolymerization of 4‐vinyl pyridine with methyl acrylate initiated by p‐acetylbenzylidene triphenylarsonium ylide

Tiwari

Gehlot

2009

J of Applied Polymer Sci

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The free-radical copolymerization of 4-vinyl pyridine (4-VP) with methyl acrylate (MA) initiated by pacetylbenzylidene triphenylarsonium ylide at 60 AE 0.1 C with dioxane as an inert solvent yielded random copolymers. , respectively. The reactivity ratios calculated with the Kelen-Tü dos method were 0.14 AE 0.0075 for 4-VP and 0.56 AE 0.0078 for MA. The copolymers were characterized with Fourier transform infrared, proton nuclear magnetic resonance, differential scanning calorimetry, and electron spin resonance methods.

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“…A literature search reveals that few research publications have documented the effect of various ylides such as p-bromophenacyl dimethylsulfonium ylide [1], imidazolium-p-chlorophenacyl ylide [2] and p-acetylbenzylidenetriphenyl arsonium ylide [3] on addition polymerization. Very few metal-ylide complexes such as the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex have been used as radical initiators [4] for the polymerization of vinyl monomer and as curing agents for the synthesis of metal acrylate [5]-based epoxy resin from this laboratory.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of epoxy resin in the presence of the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex

Pandey¹,

Srivastava²

2000

Designed Monomers and Polymers

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Modified epoxy resins have been synthesized by reacting a 1 : 10 mole ratio of bisphenol-A and epichlorohydrin in the presence of the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex at 30 • C. The value(s) for the epoxide equivalent weight and chlorine content are higher for the modified epoxy resin than for the control epoxy resin. The hydroxyl content, viscosity, and refractive indices are smaller than the control values. DSC studies show that percentage crystallinity (50% and 70%), degree of cure (α ) (0.62 and 0.84), and the glass transition temperature (T g ) (278 • C and 302 • C) of the modified epoxy resins are higher than those of the control epoxy resin. The p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex modifies and cures the epoxy resin simultaneously. The activation energy, determined from TGA, is 86 kJ/ mol and the reaction shows first-order kinetics.

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Studies on the polymerization of styrene using p‐bromophenacyl dimethyl sulfonium ylide as chain transfer agent

Cited by 9 publications

References 14 publications

Synthesis and characterization of poly(N-vinyl pyrrolidone) initiated by stibonium ylide

Synthesis and characterization of poly(N-vinyl pyrrolidone) initiated by stibonium ylide

Kinetics and mechanism of the radical copolymerization of 4‐vinyl pyridine with methyl acrylate initiated by p‐acetylbenzylidene triphenylarsonium ylide

Synthesis and characterization of epoxy resin in the presence of the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex

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