Thermo gravimetric analysis and morphological behavior of castor oil based polyurethane–polyester nonwoven fabric composites

Abstract

Castor oil (CO) based polyurethane (PU)polyester nonwoven fabric composites were fabricated by impregnating the polyester nonwoven fabric in a reactive composition containing CO and diisocyanate. Composites were fabricated with two different isocyanates such as toluene-2, 4-diisocyanate (TDI) and hexamethylene diisocyanate (HMDI). Thermogravimetric analysis (TGA) studies of the composites were performed to establish the thermal stability and their mode of thermal degradation. It was found that degradation of neat PU takes place in two steps and that of polyester nonwoven fabric reinforced PU composites takes place in three steps. From the TGA thermo-grams, a little improvement in thermal stability incase of polyester nonwoven fabric reinforced PU composites were noticed compared to unreinforced PUs. Degradation kinetic parameters were obtained for the composites using Broido, Coats and Redfern, and Horowitz and Metzger methods. Tensile fractured composite specimens were used to analyze the morphology of the composites by scanning electron microscopic technique.

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

“…9, there is an obvious difference on the second stage. This second step may correspond to the CO degradation, the soft polyurethane segment, in good agreement with previous observations [49]. The third region is from the further thermal pyrolysis of the hard segment related to the isocyanurate rings present in the structure of the foams.…”

Exploitation of Arundo donax L. Hydrolysis Residue for the Green Synthesis of Flexible Polyurethane Foams

“…Usually mass losses at 390 and 490°C have been attributed at soft (due to chain extender) and hard (due to liquefied lignin) segment, respectively (Bernardini et al 2015b). Hence, the peaks at 520 °C can be attributed to the polyurethanic chain hard-domains (Satheesh Kumar and Siddaramaiah, 2007). However, a different behaviour of the urethanic bond thermal degradation occurred in the investigated formulations.…”

Polyurethanes Based on Castor Oil: Kinetics, Chemical, Mechanical and Thermal Properties

“…This second step may correspond to the CO degradation, the soft polyurethane segment, in good agreement with previous observations. [29] The degradation products should be 10-undecanoic acid and heptanal -the degradation products of ricinoleic acid, which is the main component of CO. Finally, the third degradation stage occurs in the same range of temperature, with a T dmax comprised between 418 and 434 8C, depending on the polyurethane nature.…”