Biobased interpenetrating polymers networks derived from oligomerized soybean oil and polydimethylsiloxane

Abstract

A series of interpenetrating polymer networks (IPNs) with different compositions were prepared from silylated oligomerized soybean oil and silanol-terminated polydimethylsiloxane. Oligomerization of soybean oil was achieved by heating it with a catalyst in a Parr reactor at elevated temperatures. Vinyltrimethoxysilane was then grafted onto the oligomerized oil. Crosslinked films were obtained from solutions as the silanol groups between the two immiscible components condensed to form stable siloxanes linkages resulting in an entangled network characterized by microphase separation typical to IPNs. The crosslink density between the dispersed phase and the continuous phase was calculated from the average particle size of the dispersed phase. The mechanical and thermal properties were also studied and were found to be directly related to the composition and the crosslink density. These IPN resins can be used as high release liners, low friction materials, soft-feel coatings or as convenient one-package protective coatings.

Easy-Processable and Aging-Free All-Polymer Polysiloxane Composites

“…In addition, the immiscibility between PDMS and PS heavily destabilizes the morphology and precludes strong interfacial adhesion, − limiting the improvement of mechanical properties. The modifications can be also achieved via interpenetrating polymer networks. − Adding block copolymers (BCPs) is a classical solution to reduce the interfacial energy among otherwise incompatible polymers. The well-known thermoplastic elastomers, such as poly­(styrene-butadiene-styrene) or PS-PDMS-PS, are block copolymers composed of hard and soft polymer blocks. − Self-assembly yields microphase-separated structures with plastically deformable microdomains that serve as physical cross-links; a careful design of the composition and molecular weight allows tailored mechanical properties.…”