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Mechanical Properties and Thermal Stability of Intermolecular-fitted Poly(vinyl Alcohol)/α-chitin Nanofibrous Mat by Seunghwan Choy; Hyunwoo Moon; Yeonju Park; Young Mee Jung; Jun Mo Koo; Dongyeop X. Oh; Dong Soo Hwang is a Materials Science article available to read on EtoBox.

What is Mechanical Properties and Thermal Stability of Intermolecular-fitted Poly(vinyl Alcohol)/α-chitin Nanofibrous Mat about?

The major disadvantage of electrospun nanofibrous mats is their poor mechanical properties, which result from interfibrillar slips, porous structures, and the isotropic conformation of functional groups in fibers. In this work, we develop a tough electrospun mat without cost of both the stiffness and extensibility by combining two mutually exclusive polymers, i.e., generally "ductile" poly(vinyl alcohol) (PVA) and "stiff" α-chitin. The toughness of PVA/α-chitin is considerably higher (∼20 times) compared to PVA via intermolecular-fitted design and stoichiometric balance between hydrogen bonding donors and acceptors. Moreover, consistently oriented functional groups that are perpendicular to nanofibers improve mechanical properties. As a result, stiffness and extensibility are simultaneously increased by ∼19.3 and ∼3.8 times, respectively compared to PVA. The thermal stability with a 2.80-fold larger melting enthalpy of 823.95 ± 7.05 J g than PVA. The great thermomechanical performance provides an insight for molecular design in electrospun nanofibers with chitin polymorphs.

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Author

Seunghwan Choy; Hyunwoo Moon; Yeonju Park; Young Mee Jung; Jun Mo Koo; Dongyeop X. Oh; Dong Soo Hwang

Publisher

Elsevier BV

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)