New polymers from triglycerides and silicones

Abstract

In this study Maleinized Soybean Oil (SOMA) was used as a crosslinking agent for two functional polydimethylsiloxanes. In the first example, the silicone used was carbinol silicone. IR of the product proved the formation of a new ester. In the second case, the silicon used had aminopropyl side groups and IR of the product proved the formation of imides. In the case of poymerization between amino silicone and SOMA, Interfacial polymerization technique was used by making thin films of the two monomers and by putting them in intimate contact. This film has two surfaces. One surface is rich in SOMA and the other is rich in amino silicone. Each surface has different surface hardness. The products obtained were characterized by FTIR. For SOMA-carbinol silicone, polymer sample which has lower content of SOMA showed an average 175 MPa storage modulus while sample which has higher content of SOMA showed a storage modulus of 1850 MPa. This shows that increasing SOMA content increases the cross link density of the final product. The effects of compositions SOMA and carbinol silicone monomers were also analyzed by swelling test. The equilibrium swelling ratio (q) of the copolymer sample also decreases from 8.9 to 3.5 upon increasing the SOMA content, which indicates an increase in the crosslink density. Swelling test was also done for SOMA-amino silicone film. The equilibrium swelling ratio (q) value for this film was 12,95 which is a good indication for the formation of cross linking reaction. Surface hardness was measured for both SOMA-carbinol and SOMA-amino silicone polymers. For carbinol silicone, this value was 27 and for the amino silicone this value was 47 respectively. The two surfaces of SOMA-Amino silicone film were characterized by contact angle measurement. Contact angle of the silicone rich surface was 1230 while SOMA rich surface was 900 since silicone is more hydrophobic than SOMA. Finally, tensile test were made to analyze mechanic properties of SOMA-amino silicone film. The film was a flexible material and had a maximum tensile strength of 11(MPa).