Synthesis and design of polyurethane and its nanocomposites derived from canola‐castor oil: Mechanical, thermal and shape memory properties. Issue 21 (24th September 2020)

• Record Type: Journal Article
• Authors: Dehghan, Parham; Noroozi, Mina; Sadeghi, Gity Mir Mohamad; Abrisham, Mahbod; Amirkiai, Arian; Panahi‐Sarmad, Mahyar
• Is Part Of: Journal of polymer science. Volume 58:Issue 21(2020)
• Page Start: 3082
• Page End: 3094
• Publication Date: 2020-09-24
• Subjects: bio‐based polyurethane -- canola‐castor oil -- graphene oxide -- nanocomposites -- shape memory properties; Polymers -- Periodicals; Polymerization -- Periodicals; Polymerization; Polymers; Periodicals; 547.7
• DOI: 10.1002/pol.20200474
• Languages: English
• ISSNs: 2642-4150

Abstract

Abstract: The recent global pandemic and its tremendous effect on the price fluctuations of crude oil illustrates the side effects of petroleum dependency more evident than ever. Over the past decades, both academic and industrial communities spared endless efforts in order to replace petroleum‐based materials with bio‐derived resources. In the current study, a series of shape memory polymer composites (SMPC's) was synthesized from epoxidized vegetable oils, namely canola oil and castor oil fatty acids (COFA's) as a 100% bio‐based polyol and isophorone diisocyanate (IPDI) as an isocyanate using a solvent/catalyst‐free method in order to eventuate polyurethanes (PU's). Thereafter, graphene oxide (GO) nanoplatelets were synthesized and embedded in the neat PU in order to overcome the thermomechanical drawbacks of the neat matrix. The chemical structure of the synthesized components, as well as the dispersion and distribution levels of the nanoparticles, was characterized. In the following, thermal and mechanical properties as well as shape memory behavior of the specimens were comprehensively investigated. Likewise, the thermal conductivity was determined. This study proves that synthesized PU's based on vegetable oil polyols, including graphene nanoparticles, exhibit proper thermal and mechanical properties, which make them stand as a potential candidate to compete with traditional petroleum‐based SMPC's. Abstract : In the present study, thermoplastic polyurethane (PU), produced from canola and castor oils via a free‐solvent and catalyst technique, was employed as a polymer matrix. Graphene oxide as a conductive filler was embedded in the PU matrix. The microstructure of PU composites was precisely tailored with enhanced mechanical and thermal properties. PU composites exhibit outstanding shape memory behavior, shape recovery and fixity were increased to 90.7 and 90.4%, respectively.