EFFECT OF TEMPERATURE IN THE EMULSIFICATION STEP ON THE YIELD AND QUALITY OF THE ROSE OIL FILLED UREA-FORMALDEHYDE MICROCAPSULES PREPARED BY INTERFACIAL IN SITU POLYMERIZATION METHOD
DOI:
https://doi.org/10.59957/jctm.v60.i6.2025.3Keywords:
Keywords: microencapsulation, in situ polymerization, rose oil, mono methylol urea, pre - polymer, emulsification step, temperature, microdropletAbstract
In the present work, the influence of reaction temperature in the emulsification step on the efficiency of the encapsulation process of rose oil by in situ polymerization, using urea - formaldehyde resin, forming the shell of the microcapsules, was studied. The process was carried out at the following temperatures: 40°C, 50°C, 60°C and 70°C. It was established that the effect of temperature during this step is ambiguous, as during the first sub - step (stage A) of the emulsification step, its increase leads to an increase in the efficiency of the encapsulation process, the yield and quality of the obtained microcapsules, as well as a decrease in the size of the obtained microcapsules. This is mainly due to a reduction in the size of the microdroplets obtained during this stage, determining the size of the future microcapsules. In the second stage of the emulsification step, the increase in temperature to certain
values (from 40°C to 50°C) also leads to an increase in the efficiency of the process, the yield and the quality of the obtained microcapsules. Increasing the temperature above 50°C (60 and 70°C) leads to desorption of the pre - polymer particles from the surface of the microdroplets, and from there to deterioration of the quality of the capsule shell, which leads to a decrease in the yields and quality of the microcapsules. For these reasons, the author chooses a temperature optimum of 45°C for this stage, changing the other conditions and observing the effect of this change.
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