Electrospun composite nanofibres of PVA loaded with nanoencapsulated n-octadecane

Abstract

In this study composite nanofibres of PVA consisting of polystyrene/n-octadecane nanocapsules were prepared. The n-octadecane present as a core of the nanocapsules acts as a phase change material (PCM) for thermal storage properties. Controlled size nanoencapsulated PCMs were prepared by surfactant free RAFT miniemulsion polymerization of styrene. These nanocapsules were incorporated into nanofibres by electrospinning a mixture of nanocapsule latex containing octadecane as a core and polystyrene (PS) as a shell material with an aqueous solution of poly(vinyl alcohol). The morphology and thermal properties of the resultant PVA nanofibres were studied by field emission scanning microscopy (FE-SEM), scanning transmission electron microscopy (STEM), high resolution transmission electron microscopy (HRTEM) and differential scanning calorimetry (DSC). The composite nanofibres could show a latent heat storage capacity of approx. 4-5 J g À1 . This method offers the opportunity to produce low diameter composite nanofibres with uniform dispersion of encapsulated material for various applications.

One-way freezing method to construct MWCNTs/BC framework in melamine foam for composite phase change materials applied in thermal management and energy conversion

“…However, there are the following limitations of pure organic PCMs when in use: (1) poor thermal conductivity; (2) easy leakage under high temperature; (3) single form of energy conversion, which bring di culties to further expansion (Wei et al 2018;Umair et al 2019;Yang et al 2017a). To this end, researchers propose to use spinning method, microcapsule encapsulation method and 3D porous matrix method to modify the pure PCMs (Sirohi et al 2015;Naikwadi et al 2020;Yang et al 2017b). The 3D porous matrix method is to apply the porous material, for instance metal frame, aerogel, melamine foam (MF) and loofah ber as a support matrix to adsorb PCMs to form a composite materials system (Song et al 2020;Lin et al 2021).…”

Green Electrospinning of Polymer Latexes: A Systematic Study of the Effect of Latex Properties on Fiber Morphology

“…They electrospun poly(styrene) (PS) polymer particles of different diameters using polyvinyl alcohol (PVA) as polymer template with the help of a polymeric surfactant (Basenol). Since then, different works have been published on the electrospinning of diverse types of polymer particles such as PS [ 20 , 21 , 22 , 23 , 24 ], poly(styrene-co-butyl acrylate) (PS/BA) [ 25 ], poly(methyl methcrylate-co-butyl acrylate) (PMMA/BA) particles bearing crosslinkable monomers [ 26 , 27 ], crosslinked core-shell PS/PMMA particles bearing quantum dots [ 28 ], waterborne polyurethanes (WPU) [ 29 , 30 , 31 ], microgels [ 32 ], core-shell microcapsules [ 33 , 34 , 35 ] or block copolymers [ 36 ]. Regarding the type of polymer template, although PVA has been the most frequently used one [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 37 ], others such as polyethylene oxide (PEO) [ 34 , 36 ] (or poly(vinyl formamide) (PVFA)) [ 26 ] have also been employed.…”

Core-Sheath Paraffin-Wax-Loaded Nanofibers by Electrospinning for Heat Storage

“…For instance, Yu et al chose soy wax as the encapsulated material, and latent heat of the material was obtained as 36.47 J/g . Jassal et al fabricated nanoencapsulated octadecane nanofibers, and the latent heat obtained was 4.3 J/g . Unfortunately, the latent heat enthalpy of these obtained materials was low, which indicates that it is of great importance to further improve their encapsulation efficiency.…”

“…12 Jassal et al fabricated nanoencapsulated octadecane nanofibers, and the latent heat obtained was 4.3 J/g. 34 Unfortunately, the latent heat enthalpy of these obtained materials was low, which indicates that it is of great importance to further improve their encapsulation efficiency. Furthermore, there is scarce study investigating paraffin-wax-encapsulated materials via coaxial electrospinning.…”