Characterization of Castor Oil and Diphenyl Methane Diisocyanate-based Polyurethane-Polystyrene Interpenetrating Networks

Abstract

Castor oil is an abundant natural polyol. It has been subjected to extensive investigations for polyurethane formation, suitable for a variety of applications. In this work, polyurethane prepolymers have been synthesized by bulk polycondensation of the moisture-free castor oil with diphenyl methane diisocyanate at room temperature. These prepolymers have been then cross-linked in situ with different quantities of styrene to prepare simultaneous interpenetrating polymer networks (IPNs). The composition of the polyurethane and polystyrene IPNs ranges from 10 to 50% by weight. The morphology, mechanical properties, chemical absorption, and swelling behavior of the IPNs prepared have been analyzed to evaluate the effect of styrene content in the IPNs. The tensile modulus improves with increasing quantity of styrene with a maximum at 50%. The absorption of these IPNs is maximum in pyridine and decreases with increasing quantity of styrene up to 40% and a sudden jump has been observed for 50% styrene content. For swelling study, the diffusivity coefficient increases with increasing PS content while sorption coefficient shows a decreasing trend.

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“…Debido a su disponibilidad y bajo costo, algunos aceites vegetales han sido usados en la preparación de poliuretanos e IPNs. Dentro de estos aceites, especial interés ha recibido el de ricino ya que se caracteriza por ser uno de los pocos aceites vegetales cuya composición se reduce casi a la de un solo componente: el 90% corresponde al triglicérido del ácido ricinoléico [1,2] . Kumar et al estudiaron ampliamente la síntesis y caracterización de redes interpenetradas de polimetilmetacrilato (PMMA) y poliuretano obtenido a partir del aceite de ricino, sin ser sometido a modificaciones en su estructura [3] .…”

Swelling kinetics of linseed oil‐based nanocomposites

“…The swelling technique is an easy and commonly used method to determine various coefficients such as diffusion, sorption, and permeability coefficient 15–19. In swelling experiments, the polymer of known dimension is dispersed in a solvent, the solvent mass uptake versus time is recorded, and the data are used to calculate the various coefficients.…”

Swelling kinetics of linseed oil‐based polymers

“…Sorption and diffusion of the solvents in and through polymers have been widely investigated from both theoretical as well as experimental point of view 1–3. The swelling technique is a commonly used method to determine various coefficients such as diffusion, sorption, and permeability coefficient 4–8. In swelling experiments, the polymer of known dimension is dispersed in a solvent, and the solvent mass uptake versus time is recorded and the data is used to calculate the various coefficients.…”