12-Hydroxyoctadecanoic acid polymer, with

Hydroxyoctadecanoic acid polymer with a-hydro-to-hydr-oxypoly(oxy-l,2-ethanediyl) polyethylene glycol 660 12-hydroxystearate Solutol HS IS. 

Ricinoleic acid was polymerised via dehydration with an immobilised poly(e-caprolactone) (PCL) catalyst to give a polymer with MW up to 8,500 Da [14]. Immobilised CALB was efficient as a catalyst for the dehydration polycondensation of cis-9,10 epoxy-18-hydroxyoctadecanoic acid (from the outer birch bark) in toluene, in the presence of molecular sieves at 75 C, to give a polyester with the highest MW of 2.0 X lO Da after 68 h [15]. 

It has been reported that the major aliphatic monomers of suberin polymers from several tree barks are fatty acids with both a>- and mid-chain oxygenation (192). These monomers include 9,10-epoxy-18-hydroxyoctadecanoic acid and 9,10,18-trihydroxyoctadecanoic acid, both of which are common components of cutin polymers (232). For example, 9,10-epoxy-18-hydroxyoctadecanoic acid was reported to be the major monomer (31%) of Quercus ilex bark suberin and... 

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