Non-isocyanate polyurethanes prepared by cyclic carbonates derived from epoxy soybean oil and CO2 can exhibit the reprocessing ability and facilitate the realization of carbon neutrality, but the relatively high temperature...

Rosin modified aminopropyltriethoxysilane (RA) was prepared via an epoxide ring opening reaction of rosin based glycidyl ester with aminopropyltriethoxysilane. The structure of RA was confirmed by Fourier transform infrared spectroscopy (FT-IR), 1H NMR, and 13C NMR. RA was used as a cross-linking agent to prepare room temperature vulcanized (RTV) silicone rubber with hydroxy terminated polydimethylsiloxane (PDMS) matrix in the presence of an organotin catalyst. Morphological, thermal, and mechanical properties of the rosin modified RTV silicone rubbers were characterized by scanning electron microscope (SEM), thermal gravimetric analysis (TG), universal testing machine, and dynamic mechanical analysis (DMA), respectively. Compared to the silicone rubber using tetraethoxysilane (TEOS) as the cross-linking agent, the RA modified RTV silicone rubber exhibited a significant enhancement in thermal stabilities and mechanical properties due to the strong rigidity and polar hydrogenated phenanthrene ring structure of rosin and the uniform distribution of RA in the RTV silicone rubber.

We report on an efficient method for the formation of modified cellulose-based materials with enhanced hydrophobic properties, formed by grafting with polymeric epoxidized soybean oil (ESO) as a renewable, environmentally friendly, and low cost raw material. The grafting process occurred via ring-opening polymerization, wherein the cellulose hydroxyl groups acted as initiators in the presence of a SnCl 4 catalyst, linking the cellulose fibers and ESO via ether linkages, thereby forming a polymeric matrix. The surface polarity was therefore decreased by the substitution of cellulose hydroxyl groups for long-chain hydrophobic alkane moieties from ESO. The water contact angle of modified filter paper reached 145.1°w ith the surface free energy decreasing to 22.07 mJ m −2 and a hydration free energy of −13.09 mJ m −2 . The presence of polymeric ESO nanoparticles on the modified cellulose fibers suggested that the hydrophobicity was not only dependent on the surface composition but was also closely related to the surface morphology. To reveal the effects of surface morphology on hydrophobicity, smooth cellulose films anchored to mica plates via PVAm with a surface roughness of 1.698 nm were prepared by spin coating and modified with ESO. The thus-formed modified cellulose films also contained polymeric ESO nanoparticles which increased their roughness and enhanced their hydrophobic properties.