Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13870
Title: Chemorheological study of phosphorylated flame retardant epoxies
Authors: Yung, KC 
Wang, J
Yue, TM 
Keywords: Chemorheology
Cox-Merz relation
Flame retardant
Phosphorylated epoxy
Time-cure-temperature modelling
Issue Date: 2011
Publisher: Maney Publishing
Source: Plastics, rubber and composites, 2011, v. 40, no. 1, p. 25-31 How to cite?
Journal: Plastics, Rubber and Composites 
Abstract: The aim of this work is to study the chemorheology of the phosphorylated novolac epoxy used in flame retardants. The rheological properties are measured by a parallel plate viscometer and are combined with the kinetics of the curing reaction to explore the conversion dependent character of the viscosity. It was found that dynamic viscosity is a unique function of the effective shear rate over a wide range of frequencies and strains after being corrected for temperature. The effective shear rate dependence of the viscosity is described with a power law with an exponent that depends on the conversion. The effect of temperature is described with an Arrhenius type equation with conversion dependent parameters. Differential scanning calorimetry was applied to determine the kinetic equation that is used, in combination with the thermal history, to obtain the conversion during the rheological measurements. Time-cure-temperature modelling was applied to study a variety of factors that had an influence on the chemorheology. It was also found that the Cox-Merz relation can be utilised to correlate the dynamic viscosity data to the shear viscosity data. The Castro-Macosko model is proposed when considering the combination effects of shear thinning viscosity and reaction kinetics.
URI: http://hdl.handle.net/10397/13870
DOI: 10.1179/174328911X12940139029248
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