Isothermal bulk polymerization ofp-alkylaryl methacrylates by DSC

Filipović, Jovanka M.; Petrovic-Dakov, D. M.; Vrhovac, Lj. P.; Veličković, Jovan

doi:10.1007/bf01979400

Cited by 6 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conversion at different reaction times were calculated from the area between the curve and the baseline, which was obtained by back extrapolation of the straight line, recorded after the end of the polymerization reaction [32,33]. The experimental heat of polymerization is with less than 10% consistent with the literature (Ϫ67.5 to Ϫ70 kJ mol Ϫ1 , [26]).…”

Section: Methodssupporting

confidence: 66%

Kinetic modeling of free radical polymerization of styrene initiated by the bifunctional initiator 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane

Cavin

2000

Polymer

View full text Add to dashboard Cite

This paper deals with the kinetic study of bulk free radical polymerization of styrene initiated with the commercial bifunctional initiator 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane (Lupersol 256). The polymerization kinetics is investigated by DSC measurement for temperatures between 80 and 110ЊC and for initiator initial concentration from 0.115 up to 0.46 mol%. The experimental conversion and reaction rate are compared and discussed with the calculated values. For modeling the polymerization rate, a reaction scheme similar to the one given by Yoon and Choi (Polymer 1992;33(21):4582-4591) has been used and adapted. A detailed diffusional and semi-empirical model proposed by Chiu et al. (Macromolecules 1983;16(3):348-357) has been modified by Rouge (Etude de la polymérisation radicalaire du styrène initiée par un amorceur bifonctionnel dans un réacteur tubulaire à recyclage, Diploma work, DC, EPF, Lausanne, 1997) in order to describe these results. The model allows the description of the number molecular weight, but the polydispersity is underestimated for conversion higher than 70%. For temperature higher than 100ЊC, thermal initiation must be taken into account. The efficiency factor is found close to 1, but seems to decrease for temperatures above 100ЊC. ᭧

show abstract

Section: Methodssupporting

confidence: 66%

Kinetic modeling of free radical polymerization of styrene initiated by the bifunctional initiator 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane

Cavin

2000

Polymer

View full text Add to dashboard Cite

show abstract

Thermal analysis of the polymerization process on the surface of inorganic fillers

Gutman

Bobovitch

Pinski

et al. 1996

Journal of Thermal Analysis

View full text Add to dashboard Cite

The thermal polymerization of pentabromobenzyl (mono)aerylate (PBB-MA) on the surface of the inorganic fillers Mg(OH)2 and CaCO3 was studied. FTIR spectroscopy and extraction of the polymer in bromobenzene show that polypentabromobenzyl acrylate (PBB-PA) was mostly grat~ed on the surface of Mg(OH)2. Thermal analysis (TG, DSC, isothermal DSC (IDSC)) demonstrated an increase in polymerization starting temperature, and differences in polymerization enthalpy and apparent activation energy when an inorganic filler is added. These differences depend on the chemical composition of the f'dler used.

show abstract

Investigation of isothermal bulk polymerization ofo-alkyaryl methacrylates by DSC

Petrović-Djakov

Filipović

Vrhovac

et al. 1996

Journal of Thermal Analysis

Self Cite

View full text Add to dashboard Cite

The kinetics of the AIBN-initiated free radical bulk polymerization of five o-alkylphenyl methaerylates was studied by means of DSC in the temperature range 353-373 K, and the enthalpy of polymerization, the overall reaction rate constant and the activation energy were determined. The results were compared with those published recently on corresponding p-alkylaryl methaerylates. All measured reaction rate constants were found to increase with increasing temperature and to decrease with increasing o-alkyl substituent mass and size. It was shown that osubstituents influence the rates of polymerization to a greater extent than p-substituents. At about 373 K, all differences in rate, most probably resulting from steric hindrance caused by the alkyl groups, disappear in both series, a phenomenon earlier observed for dimethyl phenyl methaerylares.

show abstract

Isothermal bulk polymerization ofp-alkylaryl methacrylates by DSC

Cited by 6 publications

References 7 publications

Kinetic modeling of free radical polymerization of styrene initiated by the bifunctional initiator 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane

Kinetic modeling of free radical polymerization of styrene initiated by the bifunctional initiator 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane

Thermal analysis of the polymerization process on the surface of inorganic fillers

Investigation of isothermal bulk polymerization ofo-alkyaryl methacrylates by DSC

Contact Info

Product

Resources

About