Inverse Gas Chromatography (IGC) study of vegetable oils solvency via solubility parameter


Negin Farshchi1, Ali Abbasian*,1, Kambiz Larijani2
1. Department of Polymer Engineering, Engineering Faculty, Science & Research Branch,
Islamic Azad University, Tehran, Iran.
2. Department of Chemistry, Basic Science Faculty, Science & Research Branch,
Islamic Azad University, Tehran, Iran.


In this study, the solubility parameter of vegetable oils and their interaction parameters values and dependence on temperature and gas flow rate was determined by inverse gas chromatography technique. Results show that there are three different areas in respect to flow rate that was not mentioned in previous studies. Slow, stable and fake marker areas and suggest that there is a relationship between fluids dynamic and solubility parameter values. Best flow rate was determined to be 30 ml/min. Despite the Flory Huggins theory prediction, there is no clear trend for Flory Huggins interaction parameter dependence on temperature.
Also, the negative values for Flory Huggins interaction parameter were achieved by IGC method which could not be evaluated through the Flory Huggins theory. The solubility parameter will decrease by increasing temperature, and in high temperatures it will increase by increasing flow rate.
The solubility parameter δ2 determined to be 22.21, 22.70 and 21.38 (J/cm3)0.5 at 25 °C for soybean oil, castor oil and rapeseed oil, respectively.


Today vegetable oils (VO) are one of the most auspicious materials due to the environmental concerns of growing use of petroleum based materials. VO find numerous industrial applications such as plasticizers, biodiesel, lubricants, adhesives, biodegradable packaging materials, printing inks, paints and coatings. They are also non-toxic, non-depletable, domestically abundant, non-volatile and biodegradable resource (1).

The main components of vegetable oils are triglycerides – esters of glycerol with three fatty acids. There are a great variety of polymers with different structures and functionalities which can be prepared from several highly reactive sites including double bonds, allylic positions and the ester groups that are present in triglycerides (2).

The wide range of possible combinations of vegetable oils, chemical modifications, polymerization routes, nature of the fillers and fibers used as reinforcement materials make possible tailoring the composite properties to fit the requirements of structural or functional materials. Although, the role of oil-based products may seem modest in some cases (partial replacemen ...