Synthesis of soybean oil-based biodegradable polyurethane films

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Scientists prepared a series of biodegradable polyurethane films with hydroxylated soybean oil and L-lysine diisocyanate ethyl ester.

A series of biodegradable polyurethane films (PU-Fs) is prepared by step-growth polymerisation of hydroxylated soybean oil (SBO-OH) and L-lysine diisocyanate ethyl ester (L-LDI) that are renewable-based difunctional building blocks. The influence of loading ratio by weight (SBO-OH/L-LDI (w/w) = 1:0.5; 1:1 and 1:1.5) on the biodegradable, mechanical and thermal properties of final PU-Fs is systematically investigated.

Highly biodegradable material

In the first step, epoxy groups of epoxidised soybean oil are converted to corresponding hydroxyl functionalities to react with the diisocyanate groups of L-LDI via film casting method at room temperature. The obtained PU-Fs with higher L-LDI loading exhibit higher thermal and mechanical properties as well as more hydrophobic characteristic compared to others. Moreover, biodegradability of resulting PU-Fs is also studied using hydrolytic and enzymatic degradation experiments. Noteworthy, it is found that around 50 and 60% of PU-Fs are degraded by enzymatic and hydrolytic experiments after twelve weeks.

 

Continue at: https://www.european-coatings.com/Raw-materials-technologies/Raw-materials/Synthesis-of-soybean-oil-based-biodegradable-polyurethane-films/(cpg)/LA0093?cpg=LA0093&utm_source=newsletter&utm_medium=email&utm_campaign=EC-NL-2018-09-21&utm_content=Synthesis-of-soybean-oil-based-biodegradable-polyurethane-films&uid=678731

 

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