TY  - EJOU
AU  - Shrestha, Maha L. 
AU  - Ionescu, Mihail 
AU  - Wan, Xianmei 
AU  - Petrović, Zoran S. 

TI  - Biobased Aromatic-Aliphatic Polyols from Cardanol by Photochemical Thiol-ene Reaction
T2  - Journal of Renewable Materials

PY  - 2018
VL  - 6
IS  - 5
SN  - 2164-6341

AB  - Biobased aromatic-aliphatic polyols were previously synthesized from a thermal thiol-ene reaction of propoxylated cardanol with 2-mercaptoethanol (ME) in the presence of azobisisobutyronitrile (AIBN) as a radical initiator. Cardanol used for this purpose was obtained as a dark-brown liquid (Gardner Color Reference ∼18). The photochemical thiol-ene reaction can also be used to prepare aromatic-aliphatic polyols by employing cardanol. Via the photochemical thiol-ene reaction, 2-mercaptoethanol was added successfully to C=C double bond of cardanol, suggesting that phenolic group may not play an inhibitory role in the radical thiol-ene reaction. However, we preferred to alkoxylate the phenolic hydroxyl group of cardanol, which is much more reactive with isocyanates than phenolic hydroxyls, to generate a new aliphatic hydroxyl group. Furthermore, the functionality of polyols was also improved by two methods: 1) using 1-thio-glycerol instead of 2-mercaptoethanol and 2) using alkoxylated cardanol with glycidol (Cardanol-GLY) instead of propoxylated cardanol (Cardanol-PO). These polyols were then used in preparation of rigid polyurethane foams that can be useful in various applications such as insulation of freezers, pipes and storage tanks in food and chemical industries.
KW  - Cardanol
KW  -  photochemical reactions
KW  -  thiol-ene reaction
KW  -  2-mercaptoethanol
KW  -  1-thio-glycerol

DO  - 10.7569/JRM.2017.634187