Abstract
This article deals with the synthesis of plant oil-based shape memory materials from epoxidized soybean oil (ESO) and polycaprolactone (PCL). PolyESO/PCLs were synthesized by an acid-catalyzed curing in the presence of PCL. During the reaction, PCL scarcely reacted with ESO and the crystallinity of the PCL component decreased to form a semi-interpenetrating network structure. The incorporation of the PCL components improved the maximum stress and strain at break of ESO-based network polymer. The polyESO/PCL was gradually degraded by Pseudomonas cepasia lipase. Furthermore, the polyESO/PCLs exhibited excellent shape memory properties, and the strain fixity depended on the feed ratio of ESO and PCL. The shape memory-recovery behaviors were repeatedly practicable. The resulting materials are expected to contribute to the development of biodegradable intelligent materials.
Highlights
In recent years, a growing interest in the exploitation of renewable resources in the area of energy and materials has been one of the major scientific and industrial issues, because of the depletion of petroleum resources and economic considerations
They have a large potential to substitute traditional petroleum-based products in the industry. The advantages of these bio-based materials sometimes include composting and biodegradability after their use. Plant oils such as soybean oil, palm oil, linseed oil, and sunflower oil are expected as an ideal alternative chemical feedstock, since plant oils are found in abundance in the world [4]
The PCL components were dissolved in chloroform, and the residue weight was close to the feed weight of epoxidized soybean oil (ESO)
Summary
A growing interest in the exploitation of renewable resources in the area of energy and materials has been one of the major scientific and industrial issues, because of the depletion of petroleum resources and economic considerations. Direct radical or cationic polymerization of most plant oils is structurally difficult due to their non-conjugated and internal double bonds, resulting in the formation of viscous liquid polymers with low molecular weight [5] Due to these properties, when triglycerides have been a minor component in polymeric materials, they have been used solely as a modifier to improve their physical properties. The cationic polymerization of epoxidized plant oils has been investigated using photoinitiators, latent catalysts, and acid catalysts to produce bio-based epoxy resins These epoxy compounds from renewable resources possess a high potential as a starting material for bio-based thermosetting plastics, the triglycerides are made up of aliphatic chains, and the plant oil-based materials are incapable of the rigidity and strength required for some applications by themselves [11–15]. The shape memory properties of the resulting material were investigated
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