Preparation of divinylbenzene copolymer particles with encapsulated hexadecane for heat storage application

Abstract

From the viewpoint of heat storage application, encapsulation of n-hexadecane (HD) was carried out by micro-suspension copolymerizations of divinylbenzene (DVB) and acrylic monomers (butyl acrylate, BA; ethyl acrylate, EA) utilizing the selfassembling of phase separated polymer (SaPSeP) method proposed by the authors. The heat of solidification (H s) of encapsulated HD in the micron-sized, cross-linked particles was determined by differential scanning calorimeter (DSC). H s of the encapsulated HD in poly(DVB) particles was much lower than that of pure HD, but it was increased with BA or EA content copolymerized up to that of pure HD. Such an influence of encapsulation on the H s was discussed.

Preparation of polydivinylbenzene/natural rubber capsule encapsulating octadecane: Influence of natural rubber molecular weight and content

“…This phenomenon is quite general for the encapsulation as also observed by other researchers [3,5,6,[9][10][11][15][16][17][18][19]. The possible reason of the reduction of H m and H c of encapsulated heat storage materials is that the phase separation between the polymer shell and heat storage material core was incomplete as in the case of PDVB/HD microcapsules prepared by suspension polymerization [11]. Moreover, the capsules may have some unreacted monomers or oligomers incorporated at the interface between polymer shell and heat storage material core as in the case of PS/HD microcapsules pre- pared by suspension polymerization [16].…”

“…They may act as a compatibilizer and increase the miscibility between polymer and heat storage material leading to the decrease of their phase separation in the monomer droplet. However, to overcome this problem, the copolymerization with more polar monomers is a good idea as copolymerization of PDVB with methyl acrylate, ethyl acrylate and butyl acrylate [11]. In the case of phase transition temperature, T m of encapsulated OD (28.3°C) was almost the same as that of bulk OD (30.0°C).…”

“…Polystyrene (PS) microcapsules containing paraffin wax were synthesized by suspension like polymerization [8]. The Self-assembling of Phase Separated Polymer (SaPSeP) method is one of many methods applied for the encapsulation of them [9][10][11][12]. The polymer chains formed during polymerization in the monomer droplet are diffused and trapped near the interface based on surface coagulation and gradually piled at the inner interface resulting in a polymer shell.…”

Radical Desorption Kinetics in Emulsion Polymerization, 2 – Brownian Dynamics Simulation of Radical Desorption in Non‐Homogeneous Particles

“…Considering monomer-soluble initiators, this may be the case of a monomer layer around a polymer particle [15] or the encapsulation of a non-solvent by a polymer shell (hollow particles). [16,17] Also for this case, an analytical solution is difficult to obtain but the rate coefficients can be easily obtained from BD simulations. In Figure 4 the results obtained varying the volume fraction of the shell are presented considering the following conditions:…”

Latent Heat Enhancement of Paraffin Wax in Poly(divinylbenzene-co-methyl methacrylate) Microcapsule

“…Microencapsulations of paraffin waxes with polystyrene (PS) [10,[14][15][16] , poly(styrene-methyl methacrylate) [17] , polydivinylbenzene (PDVB) [18][19][20][21] , poly (styrene-divinylbenzene) [22] , polymethyl methacrylate (PMMA) with different cross-linking agents [23] , and poly(methyl methacrylate-methacrylic acid) [24] were carried out by suspension polymerization. PDVB microencapsulated HD [25,26] and PS microencapsulated commercial wax (Repsol YPF) [27] were also prepared by suspension polymerization utilizing the Shirasu porous glass membrane emulsification method for the preparation of comparatively monodisperse oil droplets.…”