Studies on high conversion polymerization of n-alkyl acrylates

Radical copolymerization of behenyl (systematic IUPAC nomenclature: n-docosyl) acrylate and behenyl fumarate has been carried out in toluene at 70°C using benzoyl peroxide as initiator. Gel permeation chromatography was used to determine molecular weights (MW) and molecular weight distribution (MWD) of behenyl acrylatebehenyl fumarate (BA-BF) copolymers.1 H NMR and carbon analysis was used to determine the composition of BA-BF copolymers. Monomer reactivity ratios for high conversion polymerization were calculated by conversion-extended Kelen-Tudos plot. Differential scanning calorimetric (DSC) measurements shows sharp melting peaks at about 64°C. Thermal stability studies were performed with thermogravimetric analyzer (TGA). By using these DSC and TGA data in several nonisothermal methods, the activation energies were calculated. X-ray diffraction studies show the linearity of the copolymers.

“…Behenyl acrylate (BA) and behenyl fumarate (BF) were prepared and purified as before 6. The solvents and the initiator (BP) were purified by standard methods.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and thermal properties of copolymers of behenyl acrylate and behenyl fumarate

Sarmah¹,

Baruah²

2003

“…We recently investigated the polymerization behavior of higher alkyl acrylates and methacrylates to derive their structure-reactivity relationship. 35,36 The large demand for poly(n-alkyl acrylates) with narrow MWDs prompted research toward improving processes for the polymerization of n-alkyl acrylates. Like many industrial polymers, polymerizations to synthesize PPDs/FIs are conducted by free-radical polymerization.…”

Section: Introductionmentioning

confidence: 99%

Transition metal‐catalyzed atom transfer radical polymerization of stearyl methacrylate in the presence of carbon tetrabromide and a conventional radical initiator

Saikia

Goswami

Baruah

2002

Atom transfer radical polymerization of stearyl methacrylate (SMA) was successfully carried out in N,N-dimethylformamide using the carbon tetrabromide/ Fe(III)/2,2Ј-bipyridine initiator system in the presence of 2,2Ј-azobisisobutyronitrile (AIBN) as the source of the reducing agent to maintain the equilibrium between growing radicals and dormant species. The molecular weights of the resulting poly(stearyl methacrylate) (PSMA) increased with the conversion and the molecular weight distribution of PSMA was quite narrow. The rates of polymerization exhibit first-order kinetics with respect to the monomer. A probable reaction mechanism for the polymerization system was postulated to explain the observed results. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 386 -394, 2002

“…We recently investigated the polymerization behavior of higher alkyl acrylates and methacrylates to derive their structurereactivity relationships. 3,4 As for many industrial polymers, polymerizations to synthesize PPDs and FIs are conducted by free-radical polymerization. The high-conversion free-radical polymerization of n-alkyl (meth)acrylates shows a strong Trommsdorff effect or gel effect even though the polymerization is carried out above the glasstransition temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The large demand for poly( n ‐alkyl acrylate)s and poly( n ‐alkyl methacrylates) with narrow polydispersities has prompted researchers to improve processes for the polymerization of n ‐alkyl (meth)acrylates. We recently investigated the polymerization behavior of higher alkyl acrylates and methacrylates to derive their structure–reactivity relationships 3, 4. As for many industrial polymers, polymerizations to synthesize PPDs and FIs are conducted by free‐radical polymerization.…”

Section: Introductionmentioning

confidence: 99%

Reverse atom transfer radical polymerization of stearyl methacrylate using 2,2′‐azobisisobutyronitrile as the initiator

Saikia

Goswami

Baruah

2002

ABSTRACT:The living/controlled radical polymerization of stearyl methacrylate was carried out with a conventional radical initiator (2,2Ј-azobisisobutyronitrile) in N,Ndimethylformamide in the presence of a 2,2Ј-bipyridine complex of hexakis(N,N-dimethylformamide)iron(III) perchlorate. The polymerization mechanism was thought to proceed through a reverse atom transfer radical polymerization. The molecular weights of resulting poly(stearyl methacrylate) increased with conversion, and the resulting molecular weight distributions were quite narrow. The rates of polymerization exhibited first-order kinetics with respect to the monomer. A probable reaction mechanism for the polymerization system is postulated to explain the observed results.