Radical Polymerization of N-Vinylcaprolactam in Isopropanol

Kudyshkin, V. O.; Abdurakhmanova, T. R.; Bozorov, N. I.; Воропаева, Н. Л.; Ruban, I. N.; Рашидова, С. Ш.

doi:10.1023/a:1022241331799

Cited by 6 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, if we observe the conversion corresponding to R p , R max , we can see that this parameter also increased as the initial monomer concentration increased. This fact can be attributed to the acceleration of the decomposition of the initiator in the presence of higher monomer‐to‐solvent ratios leading to the increase of initiation rate 30. The relationship between the AIBN decomposition rate constant and the monomer concentration was observed by Szafko and Feist 31.…”

Section: Resultsmentioning

confidence: 90%

Solution polymerization of N‐vinylcaprolactam in 1,4‐dioxane. Kinetic dependence on temperature, monomer, and initiator concentrations

Medeiros

Barboza

Ré

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

The kinetics of the solution free radical polymerization of N-vinylcaprolactam, in 1,4-dioxane and under various polymerization conditions was studied. Azobisisobutyronitrile and 3-mercaptopropionic acid were used as initiator and as chain transfer agent (CTA), respectively. The influence of monomer and initiator concentrations and polymerization temperature on the rate of polymerizations (R p ) was investigated. In general, high conversions were obtained. The order with respect to initiator was consistent with the classical kinetic rate equation, while the order with respect to the monomer was greater than unity. The overall activation energy of 53.6 kJ mol À1 was obtained in the temperature range 60-80 C. The decreasing of the absolute molecular weights when increasing the CTA concentration was confirmed by GPC/ SEC/LALS analyses. It was confirmed by UV-visible analyses the effect of molecular weights on the lower critical solution temperature of the polymers. It was also verified that the addition of the CTA influenced the kinetic of the polymerizations.

show abstract

Section: Resultsmentioning

confidence: 90%

Solution polymerization of N‐vinylcaprolactam in 1,4‐dioxane. Kinetic dependence on temperature, monomer, and initiator concentrations

Medeiros

Barboza

Ré

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…According to the data in Table 1, as it was expected, the increasing concentration of IPA, gives a clear decreasing of the average molecular weight of the obtained polymer, with a polydispersity index corresponding to a classical free radical mechanism. It has been observed that the free radical polymerization of VCL in IPA deviates from the classical first order kinetics, indicating the existence of chain-transfer to solvent, with a relatively small constant (Kudyshkin et al, 2002). Under these conditions, it has been demonstrated that IPA controls the molecular weight of the growing VCL macroradical.…”

Section: Synthesis Of Pvcl-coohmentioning

confidence: 99%

“…Under these conditions, it has been demonstrated that IPA controls the molecular weight of the growing VCL macroradical. Hydrogen bonding of the monomer with the solvent seems to cause the presence of free and solvated monomer species differing in the polarization of the double bond (Kudyshkin et al, 2002). As far as the IPA/water mixed systems is concerned, the PVCL growing chains are phase separated during the polymerization reaction, giving rise to samples with higher molecular weights.…”

Section: Synthesis Of Pvcl-coohmentioning

confidence: 99%

Effect of the molecular architecture on the thermosensitive properties of chitosan-g-poly(N-vinylcaprolactam)

Fernández‐Quiroz¹,

González-Gómez

Lizardi‐Mendoza

et al. 2015

Carbohydrate Polymers

View full text Add to dashboard Cite

“…In addition, the LCST of PVC may be depend on the molecular weight, which makes PVC a very attractive polymer. 34,42 The introduction of ionic, hydrophobic, and hydrophilic groups enables new properties to VCbased polymers by keeping on their temperature-sensitivity. 15 In the current study, the effect of temperature on the equilibrium swelling values of the gels was investigated in distilled water at different temperatures changing from 8 to 50 °C.…”

Section: Effect Of Temperature On the Swelling Behavior Ofmentioning

confidence: 99%

Synthesis and Characterization of Novel Poly(N-vinylcaprolactam-co-itaconic Acid) Gels and Analysis of pH and Temperature Sensitivity

Çavuş

Çakal

2012

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Poly(N-vinylcaprolactam-co-itaconic acid), P(VC-co-IA), gels were synthesized in ethanol by using the free radical cross-linking polymerization method at 60 °C for 24 h in the presence of azobis(isobutyronitrile) (AIBN) and allyl methacrylate (AMA) as the initiator and the cross-linking agent, respectively. In order to determine the effect of the synthesis medium on the percentage of gelation (PG) and equilibrium swelling value (ESV), an ethanol/distilled water mixture (80:20, v/v) was also used as the synthesis medium for poly(N-vinylcaprolactam) (PVC) and P(VC-co-IA) gels. The swelling behaviors of the gels were investigated in distilled water at various temperatures and in different pH buffer solutions. Structural, morphologic, and thermal characterization studies of the gels were carried out using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA), respectively. The lowest PG and highest ESV were obtained for the gel including 5 mol % IA, which was the gel synthesized in the ethanol/distilled water mixture. PVC synthesized in ethanol/water mixture had the highest percentage of gelation. All the gels displayed pH- and temperature-sensitive swelling behavior. The swelling kinetics of the copolymer gels synthesized in ethanol was investigated at pH 10.0, and it was determined that gels containing 5 and 10 mol % of IA indicated non-Fickian and case II swelling behavior, respectively.

show abstract

Radical Polymerization of N-Vinylcaprolactam in Isopropanol

Cited by 6 publications

References 6 publications

Solution polymerization of N‐vinylcaprolactam in 1,4‐dioxane. Kinetic dependence on temperature, monomer, and initiator concentrations

Solution polymerization of N‐vinylcaprolactam in 1,4‐dioxane. Kinetic dependence on temperature, monomer, and initiator concentrations

Effect of the molecular architecture on the thermosensitive properties of chitosan-g-poly(N-vinylcaprolactam)

Synthesis and Characterization of Novel Poly(N-vinylcaprolactam-co-itaconic Acid) Gels and Analysis of pH and Temperature Sensitivity

Contact Info

Product

Resources

About