Polyesters of poly (ricinoleic acid) and polyol acyl acceptors (trimethylolpropane and pentaerythritol), examples of lipophilic star polymers, were synthesized via bulk polymerization at 50 °C in a three-to-ten day period, using lipases Candida sp.99-125. In the screening of several synthesis procedures, the highest molecular weight occurred when polyricinoleic acid were synthesized from trimethylolpropane mixed with ricinoleic acid using the monomer mole ratio of 1:5 by lipase Candida sp.99-125 as biocatalyst. The reaction result shows that silica gel is much effective as water-absorbent agent for polymerization of polyols and poly (hydroxy acids) compared to the reaction conditions open to the atmosphere. Such a procedure yielded trimethylolpropane-poly(ricinoleic acid) polymers with an average molecular weight from 2000 to 5000 Da with PDI between 1.3 and 1.9, according to GPC analysis and the structure of the polymer were characterized by FT-IR, which could be satisfied for lubricant materials.
|Original language||English (US)|
|Number of pages||8|
|Journal||International Agricultural Engineering Journal|
|State||Published - Jun 2016|
- Candida sp.99-125
- Ricinoleic acid