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Your search keyword '"Nichols, Lance"' showing total 2 results
Start Over Author "Nichols, Lance" Topic hydrogen peroxide
2 results on '"Nichols, Lance"'

1. Viscoelastic Properties of Vis-Breaking Polypropylenes.

Author

Nobile, Maria Rossella, Moad, Graeme, Habsuda, Jana, Guoxin Li, Nichols, Lance, Dagley, Ian, and Simon, George P.

Subjects
VISCOELASTIC materials, POLYPROPYLENE, RHEOLOGY, HYDROGEN peroxide, VISCOELASTICITY
Abstract

In this work hydrogen peroxide is used as a green initiator to cause scissioning of polypropylene (PP) with water as the only by-product replacing the organic peroxides that are usually used. The rheological properties of a commercial polypropylene and of the scissioned samples are determined by dynamic rheology and an inversion procedure for converting the linear viscoelastic data into molar mass distribution has been adopted. The results presented show that the molar mass distribution of the PP polymer is narrowed on scissioning. The process is found to produce polymers similar in molecular architecture and behavior to organic peroxide cleaved materials, the results of which are given as a comparison in this work. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Aqueous hydrogen peroxide-induced degradation of polyolefins: A greener process for controlled-rheology polypropylene.

Author

Moad, Graeme, Dagley, Ian J., Habsuda, Jana, Garvey, Christopher J., Li, Guoxin, Nichols, Lance, Simon, George P., and Nobile, Maria Rossella

Subjects
*HYDROGEN peroxide, *POLYOLEFINS, *POLYMER degradation, *POLYPROPYLENE, *RHEOLOGY, *AQUEOUS solutions
Abstract

In this work we demonstrate that aqueous hydrogen peroxide is an effective reagent for chain scissioning or vis-breaking of polypropylene during melt-processing to produce a controlled rheology product. The novel process involves the direct injection of aqueous hydrogen peroxide into the polypropylene melt under pressure. The polypropylene produced has reduced molar mass, narrowed molar mass distribution, and is indistinguishable in terms of melt flow rate, molar mass distribution, crystallinity and melt rheology from conventionally vis-broken polypropylene produced using an organic peroxide (2,5-dimethyl-2,5-di- tert -butylperoxyhexane (DHBP)). However, the polypropylene produced in the current process is notably free of the initiator-derived organic volatiles that are formed as by-products in the case where organic peroxides such as DHBP are used. [ABSTRACT FROM AUTHOR]

Published
2015
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