Production of polystyrene/poly(ethylene glycol dimethacrylate) composite particles encapsulating hinokitiol

Okubo, Masayoshi; Minami, Hideto; Jing, Ying

doi:10.1002/app.12209

Cited by 12 publications

(17 citation statements)

References 13 publications

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“…Polymer microcapsules containing RT27 prepared by microsuspension polymerization were expected to be core-shell particles based on the internal phase separation as Self-assembly of Phase Separated Polymer (SaPSeP) mechanism [13,30] . In our previous works, the core-shell particles were formed for PMMA [31] and PDVB [18][19][20][21]26,28,31,32] shells whereas most of the obtained PS [31] microcapsule were broken after washing with 2-propanol.…”

Section: Resultsmentioning

confidence: 99%

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

Namwong

Noppalit

Okubo

et al. 2015

Polymer-Plastics Technology and Engineering

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The preparation of divinylbenzene (DVB)-methyl methacrylate (MMA) copolymer microcapsule encapsulated Rubitherm27 (RT27) P(DVB-co-MMA)/RT27 used as heat storage material by the microsuspension polymerization was studied to improve the latent heats of the encapsulated RT27 with sufficient polymer shell strength. Percent loading of RT27 and DVB:MMA ratio were optimized. The optimal condition was 30% loading of RT27 and 30:70 (% w/w) of DVB:MMA ratio. The nonspherical microcapsules with a dent having core-shell morphology were obtained. The thermal properties of the encapsulated RT27 in the P(DVB-co-MMA)/RT27 capsules were measured by thermogravimetric analyzer and differential scanning calorimeter. The heats of melting (DH m ; 153 J/g-RT27) and crystallization (DH c ; 164 J/g-RT27) of the encapsulated RT27 in the prepared copolymer capsules were higher than those in PDVB and closed to those of bulk RT27 (162 and 168 J/g-RT27 for DH m and DH c , respectively).

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Section: Resultsmentioning

confidence: 99%

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

Namwong

Noppalit

Okubo

et al. 2015

Polymer-Plastics Technology and Engineering

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“…In-situ processes such as emulsion, suspension, precipitation or dispersion polymerization and interfacial polycondensations are the most important chemical techniques used for microencapsulation [85][86][87][88][89][90]. An image of microcapsules with an aqueous core and silicone shell prepared using in-situ polymerization is shown in Figure 1.10.…”

Section: Chemical Methodsmentioning

confidence: 99%

Functional Coatings and Microencapsulation: A General Perspective

Ghosh¹

2006

Functional Coatings

160

130

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Today, many objects that we come across in our daily lives, including the house in which we live and the materials we use (e.g., toothbrushes, pots and pans, refrigerators, televisions, computers, cars, furniture) all come under the "umbrella" of coated materials. Likewise, fields such as military applications -for example, vehicles, artilleries and invisible radars -and aerospace products such as aircraft, satellites and solar panels all involve the widespread use of coated materials. Clearly, the importance of coatings has increased hugely during the modern era of technology.Coating is defined as a material (usually a liquid) which is applied onto a surface and appears as either a continuous or discontinuous film after drying. However, the process of application and the resultant dry film is also regarded as coating [1]. Drying of the liquid coating is mostly carried out by evaporative means or curing (cross-linking) by oxidative, thermal or ultraviolet light and other available methods. Paint can be defined as a dispersion that consists of binder(s), volatile components, pigments and additives (catalyst, driers, f low modifiers) [2]. The binder (polymer or resin) is the component that forms the continuous film, adheres to the substrate, and holds the pigments and fillers in the solid film. The volatile component is the solvent that is used for adjusting the viscosity of the formulation for easy application. Depending on their compositions, paints can be divided into three groups: solvent-borne, water-borne and solvent-free (100% solid). Solvent-borne paints consist of resin, additives and pigments that are dissolved or dispersed in organic solvents. Similarly, in water-borne paints the ingredients are dispersed in water. In solvent-free compositions, the paints do not contain any solvent or water and the ingredients are dispersed directly in the resin.The properties of coating films are determined by the types of binders, pigments and miscellaneous additives used in the formulation. Moreover, types of substrates, substrate pretreatments, application methods and conditions of film formation

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“…Micro/nano-capsules for anticorrosion coatings Telegdi Judit, Shaban Abdul, Vastag Gyöngyi 8 2015; Okubo et al, 2003;Szabó et al, 2011). In these reactions, solid layers are formed around the active cores (Smadzadeh et al, 2010).…”

Section: Micro-/nano-encapsulation Techniquesmentioning

confidence: 99%

Micro/nanocapsules for anticorrosion coatings

Telegdi

Shaban

Vastag

2018

Fundamentals of Nanoparticles

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In the last decade, the interest in the self-healing and slow release coatings applied against corrosion increased dramatically as it helps to expand duration of coating and, at the same time, to increase the structural materials' life. In these types of paints are micro and nanoncapsules that enable the reparation of the coating upon exposure to external stimuli like mechanical degradation, changes in the pH and/or temperature. In spite of the extensive laboratory research work, there are many unsolved problems in understanding the function of smart coatings. To summarize the knowledge accumulated up-to-now in this topic will help both academic and industrial specialists to keep in center of interest for further research to solve problems that will result in development of more effective micro-and nanocontainers for different paints. Coatings with micro-and nano-containers/capsules improve the basic coating characteristics like anticorrosion efficiency. The chapter first discusses the importance of self-healing and slow release phenomena, and then it focuses on the basic knowledge of micro-and nano-capsule preparation techniques as well as on the importance of "filled" capsules. Advances on preparation of different types of the containers (organic, inorganic, and multilayer) are reviewed. Then the shell and wall materials, the wall thickness and its mechanical properties is discussed as one of the most important questions. One must keep in mind that the capsules must remain intact for years during storage, coating formulation and application and, additionally, in the dry coating.Experimental techniques used for characterization of micro/nanocapsules (size, size distribution, mechanical stability etc.) are discussed. Corrosion is a serious problem all over the world. The cost of corrosion includes materials for reparation of corrosion damage, the reduced capacity of equipment and the manpower to repair it increases. The corrosion problems could be solved by protective layers that ensure the integrity of the metal. However, even the best protective coatings can allow the diffusion of oxygen, the admittance of aggressive chemicals and moisture to the metal surface; the coating could delaminate from the solid surface and, as a consequence, the dissolution of metal starts. The first signs of the corrosive attack are cracks and pits formed on the solid surface. The problem could be solved or mitigated by coatings that are tailored for protection against corrosion and any other undesired external interaction. They ensure a long-term performance of solids.There are great varieties of protective coatings (metallic, inorganic, organic) which are used to protect the surface damages caused by corrosive environment.Anticorrosion coatings could be classified according to their activity, like sacrifice and barrier coatings. In the case of sacrificial coatings, an additional metal layer corrodes instead of the base metal. The barrier films should be non-porous; this is how they save the metal from corrosion.Polymers ca...

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Production of polystyrene/poly(ethylene glycol dimethacrylate) composite particles encapsulating hinokitiol

Cited by 12 publications

References 13 publications

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

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

Functional Coatings and Microencapsulation: A General Perspective

Micro/nanocapsules for anticorrosion coatings

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