Synthesis of Bio‐based Polyurethane from Modified Prosopis juliflora Oil

Abstract

Studies on the epoxidation of Prosopis juliflora seed oil were carried out to evaluate the optimum level of oxirane formation. On optimization of epoxidation of Prosopis juliflora oil (PJO), it was observed that at 60 °C and the mole ratio of double bond to the hydrogen peroxide to the acetic acid was 1:1.1:0.5 and at 2 wt% catalyst loading gave the maximum oxirane conversion. Further, epoxidized Prosopis juliflora oil (EPJO) was reacted with aminopropyltrimethoxysilane. Aminopropyltrimethoxysilanated Prosopis juliflora oil (ASPJO) was used as a polyol and was allowed to react with varying concentrations of isophorone diisocyanate resulting in polyurethane. The polyurethane films biodegradability was studied using phosphate buffer and proteinase K. The epoxidized oil was characterized by its epoxy value and FT‐IR spectroscopy. Similarly, ASPJO was characterized by its amine value, FT‐IR and 1H‐NMR spectroscopy. Whereas the polyurethane coating was characterized by gel content, FT‐IR spectroscopy, scanning electron microscopic analysis and also evaluated for its chemical resistance, optical and mechanical properties.

Preparation and Spectroscopic Characterization of Si‐Coated Vegetable Oils and their Application in In Situ Curing of Hybrid Coatings

“…[26] However, the occurrence of parasitic reactions, which may be competitive in regard to the ring opening of epoxies, has not been considered. This reaction has already been reported based on the modification of an epoxidized P. juliflora oil.…”

“…[26] Then, to further understand this process, the influence of the experimental conditions on the evolution of this system was investigated. [26] Then, to further understand this process, the influence of the experimental conditions on the evolution of this system was investigated.…”

“…[26] However, in this paper, particular attention is devoted to the advanced understanding of the chemical process by using model reactions and 2D-NMR investigations to reveal the presence of side reactions occurring in the reaction medium, never noticed previously. A similar approach using an epoxy ring-opening reaction has already been reported.…”

“…[4,17,[19][20][21] The insertion of elements such as silicon and titanium is a very interesting way to modify vegetable oils, since it opens the way to cross-link oils through the sol-gel process. [26] The authors combined both urethane and sol-gel cross-linking. [22,23] Creation of a Si-modified bio-based oil involves attaching silane groups to a previously epoxidized natural oil via an aminosilane molecule, such as 3-aminopropyltriethoxysilane (APTES).…”

Fully biobased polyester polyols derived from renewable resources toward preparation of polyurethane and their application for coatings

“…[2][3][4][5] Several renewable sources have been utilized in the preparation of polymeric resins such as polysaccharides, cellulose, sugar, starch, natural fibers, proteins, cashew nut shell liquid, and glycerol esters of fats or vegetable oils. [6][7][8][9][10][11][12] Polyurethane (PU) is the group of polymers prepared from diols (hydroxyl end group containing precursor) and diisocyanates 13 with versatile applications including foam, 14 coating, 15 nanocomposite, 16,17 and so forth. They show excellent performance with concern to their physicochemical resistance and thermal properties.…”