Cure kinetics of an epoxidized hemp oil based bioresin system

Manthey, Nathan W. and Cardona, Francisco and Aravinthan, Thiru and Cooney, Tyson (2011) Cure kinetics of an epoxidized hemp oil based bioresin system. Journal of Applied Polymer Science, 122 (1). pp. 444-451. ISSN 0021-8995


A novel epoxidized hemp oil (EHO) based bioresin was synthesised by epoxidation in situ with peroxyacetic acid. In this research the cure kinetics of an EHO based bioresin system cured with Triethylenetetramine (TETA) was studied by Differential Scanning Calorimetry (DSC) using both isothermal and non-isothermal data. The results show that the curing behaviour can be modelled with a modified Kamal autocatalytic model that accounts for a shift to a diffusion-controlled reaction post-vitrification. The total order of the reaction was found to decrease with an increase in temperature from approximately 5.2 at 110°C to approximately 2.4 at 120°C. Dynamic activation energies were determined from the Kissinger (51.8 kJ/mole) and Ozawa-Flynn-Wall (56.3 kJ/mole) methods. Activation energies determined from the autocatalytic method were 139.5 kJ/mole and -80.5 kJ/mole. The observed negative activation energy is thought to be due to an unidentified competitive reaction that gives rise to the appearance of decreasing with increasing temperature. The agreement of fit of the model predictions with experimental values was satisfactory for all temperatures.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2011 Wiley Periodicals, Inc. Permanent restricted access to published version due to publisher copyright policy.
Faculty/School / Institute/Centre: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 08 Jul 2011 10:49
Last Modified: 14 Oct 2014 01:08
Uncontrolled Keywords: biopolymers; curing of polymers; differential scanning calorimetry (DSC); kinetics (polym.); renewable resources
Fields of Research : 03 Chemical Sciences > 0307 Theoretical and Computational Chemistry > 030703 Reaction Kinetics and Dynamics
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
Socio-Economic Objective: B Economic Development > 86 Manufacturing > 8603 Processed Non-Food Agriculture Products (excl. Wood, Paper and Fibre) > 860303 Plant Extracts (e.g. Pyrethrum, Alkaloids, Jojoba Oil)
B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870303 Polymeric Materials (e.g. Paints)
Identification Number or DOI: 10.1002/app.34086

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