Franco Pretorius, Elizabeth L. du Toit, Isbé van der Westhuizen, Maria T. Atanasova, Walter W Focke
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引用次数: 0
Abstract
Mixtures of butyric acid and putrescine form a crystalline amine carboxylate complex in a 2:1 molar ratio irrespective of the initial molar component mixture ratio. This was confirmed through X-ray diffraction, FTIR spectroscopy and elemental analyses. Thermogravimetric analyses proved this complex to be significantly less volatile than the pure constituent components. In thermogravimetric temperature scans, a 90% mass loss of the complex was achieved at 143.4 °C while the same level was achieved at 68.1 °C for both the pure putrescine and butyric acid. A gas permeability parameter ΦA = MADAPA/RT (g m–1s–1) was developed to quantitatively describe the volatility of the respective components through a stagnant gas layer. This parameter is a function of only material properties and temperature and adequately described the observed mass loss behaviour of pure components as well as the newly formed complex. In a preliminary field trial, mixtures of putrescine and butyric acid were less effective than pure putrescine for attracting flies. This can be attributed to the lower volatility of the putrescine/butyric acid complex and the subsequent suppression of the release rate of the active compounds.
期刊介绍:
Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application.
The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta.
The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas:
- New and improved instrumentation and methods
- Thermal properties and behavior of materials
- Kinetics of thermally stimulated processes