Abstract
This paper describes the evaluation of the stability of amylose–polymer inclusion complexes under solution state in dimethyl sulfoxide (DMSO) depending on guest polymers. The three complexes were prepared by the vine-twining polymerization method using polytetrahydrofuran (PTHF), poly(ε-caprolactone) (PCL), and poly(l-lactide) (PLLA) as guest polymers. The stability investigation was conducted at desired temperatures (25, 30, 40, 60 °C) in DMSO solutions of the complexes. Consequently, the amylose–PTHF inclusion complex was dissociated at 25 °C, while the other complexes were stable under the same conditions. When the temperatures were elevated, the amylose–PCL and amylose–PLLA complexes were dissociated at 40 and 60 °C, respectively. We also found that amylose inclusion supramolecular polymers which were prepared by the vine-twining polymerization using primer-guest conjugates formed films by the acetylation of amylose segments. The film from acetylated amylose–PLLA supramolecular polymer had higher storage modulus than that from acetylated amylose–PTHF supramolecular polymer, as a function of temperature.
Highlights
Amylose is an abundant natural polysaccharide as an energy resource present in starch [1].Besides this vital role in nature, it is a well-known functional polymer and acts as a host molecule to form supramolecular inclusion complexes with various hydrophobic guest molecules, owing to its left-handed helical conformation and hydrophobic nature inside the cavity [2]
To understand the natures of amylose–polymer inclusion complexes further, in this study we investigated the evaluation of their stability under solution state in dimethyl sulfoxide (DMSO)
On the basis of the findings, we evaluated the mechanical properties of amylose triacetate (ATA)–PTHF and ATA–PLLA supramolecular polymeric films as a function of temperature, which were found to be obtained by acetylation of the original amylose inclusion supramolecular polymers
Summary
Amylose is an abundant natural polysaccharide as an energy resource present in starch [1]. We prepared a supramolecular film via the formation of a hydrogel by the vine‐twining polymerization approach using the appropriately enzymatically produced amyloses formed inclusion complexes with grafted PCL chains in the intermolecular graft copolymers, which acted as cross‐linking points, resulting in network structures. Such network structures contributed to forming the hydrogel from the vine‐twining polymerization solution, which was converted into the supramolecular film by drying.
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