Excellent thermal stability P(BeA-co-MMA) microcapsules with high thermal energy storage capacity

Mao, Yuchen; Gong, Jin; Zhu, Meifang; Ito, Hiroshi

doi:10.1016/j.polymer.2018.07.040

Cited by 21 publications

(24 citation statements)

References 27 publications

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“…These techniques cannot produce the microcapsules with mean size diameter smaller than 100 μm. The chemical methods are categorized into the interfacial polymerization, in situ polymerization, simple or complex coacervation, layer‐by‐layer assembly, internal phase separation, emulsion polymerization, and suspension polymerization …”

Section: Introductionmentioning

confidence: 99%

Material encapsulation in poly(methyl methacrylate) shell: A review

Ahangaran

Navarchian

Picchioni

2019

J of Applied Polymer Sci

103

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Material encapsulation is a relatively new technique for coating a micro/nanosize particle or droplet with polymeric or inorganic shell. Encapsulation technology has many applications in various fields including drug delivery, cosmetic, agriculture, thermal energy storage, textile, and self-healing polymers. Poly(methyl methacrylate) (PMMA) is widely used as shell material in encapsulation due to its high chemical stability, biocompatibility, nontoxicity, and good mechanical properties. The main approach for micro/nanoencapsulation of materials using PMMA as shell comprises emulsion-based techniques such as emulsion polymerization and solvent evaporation from oilin-water emulsion. In the present review, we first focus on the encapsulation techniques of liquid materials with PMMA shell by analyzing the effective processing parameters influencing the preparation of PMMA micro/nanocapsules. We then describe the morphology of PMMA capsules in emulsion systems according to thermodynamic relations. The techniques to investigation of mechanical properties of capsule shell and the release mechanisms of core material from PMMA capsules were also investigated.

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Section: Introductionmentioning

confidence: 99%

Material encapsulation in poly(methyl methacrylate) shell: A review

Ahangaran

Navarchian

Picchioni

2019

J of Applied Polymer Sci

103

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“…Copolymer microcapsules were synthesized by free radical suspension polymerization in an emulsion system with an oil-soluble initiator. Random copolymerization was carried out with varying monomer mass ratios between BeA and MMA in a similar manner as we reported before [18]. Crystalline copolymer microcapsules MC(BeA-co-MMA)1, MC(BeA-co-MMA)3, MC(BeA-co-Polymers 2019, 10, x; doi: FOR PEER REVIEW www.mdpi.com/journal/polymers MMA)5 with monomer mass ratios of two associated monomers from 1:1, 3:1 to 5:1 were synthesized (Table 1).…”

Section: Preparation Of Copolymer Microcapsulesmentioning

confidence: 99%

“…The higher intensity and smaller half-peak width indicates a better crystal pattern with fewer disturbances from the main-chain skeleton [17,35] and MC(BeA-co-MMA)3, the strong diffraction peaks suggest good crystallization, which ensures the high phase change enthalpy and a good energy storage capacity. In our previous work, an infrared thermal testing is used to evaluate the thermoregulation property [18,20]. Owing to the good crystallization property, MC(BeA-co-MMA)5 and MC(BeA-co-MMA)3 effectively prolong the time to reach the setting temperature, showing the huge capacity to store thermal energy.…”

Section: Effect Of Monomer Ratiomentioning

confidence: 99%

Crystal Transition Behavior and Thermal Properties of Thermal-Energy-Storage Copolymer Materials with N-Behenyl Side-Chain

Mao¹,

Gong²,

Zhu³

et al. 2019

Preprint

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In this paper, we synthesized MC(BeA-co-MMA) copolymer microcapsules through suspension polymerization. The pendent n-behenyl group of BeA is highly crystalline, and it acts as the side-chain in the structure of BeA-co-MMA copolymer. The highly crystalline n-behenyl side-chain provides BeA-co-MMA copolymer thermal-energy-storage capacity. In order to investigate the correlation between thermal properties and crystal structure of BeA-co-MMA copolymer, the effects of monomer ratio, temperature changing and changing rate, as well as synthesis method were discussed. The monomer ratio influenced crystal transition behavior and thermal properties greatly. The DSC results proved that when the monomer ratio of BeA and MMA was 3:1, MC(BeA-co-MMA)3 showed the highest average phase change enthalpy ΔH (105.1 J·g–1). It indicated that the n-behenyl side-chain formed relatively perfect crystal region, which ensured a high energy storage capacity of copolymer. All the DSC and SAXS results proved that the amount of BeA had a strong effect on the thermal-energy-storage capacity of copolymer and the long spacing of crystals, but barely on the crystal lamella. It was found that MMA units worked like defects in the n-behenyl side-chain crystal structure of BeA-co-MMA copolymer. Therefore, a lower fraction of MMA, that is, a higher fraction of BeA contributed to a higher crystallinity of BeA-co-MMA copolymer for providing a better energy storage capacity and thermoregulation property. ST(BeA-co-MMA) copolymer sheets with the same ingredients as microcapsules were also prepared through light-induced polymerization aiming at clarifying the effect of synthesis method. The results proved that synthesis method mainly influenced the copolymer chemical component, but lightly on the crystal packing of n-behenyl side-chain.

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“…In our group, much of the work revolves around crystalline gels. We have developed crystalline gels with high toughness, high flexibility, and functions as shape memory, humidity regulation, thermal expansion and thermal energy storage, etc [21][22][23][24][25]. These crystalline gels are synthesized by radical photo-polymerization that involves photo-reactive reagents having the property of curing from liquid to solid with light of a sufficient energy.…”

Section: Introductionmentioning

confidence: 99%

“…The structure of SA consists of a vinyl group and a long alkane chain with eighteen methylene units. The vinyl group has reactivity to form a polymer with the aid of photo initiators, while the long alkane chain promises the high crystallinity providing the thermal energy storage capacity [24]. The rapid curing time of acrylic monomers, which is normally within a range of seconds, promises the great potential of P(SA-DMAA) gel as a 3D printable material [26,27].…”

Section: Introductionmentioning

confidence: 99%

A 3D Printable Thermal Energy Storage Crystalline Gel Using Mask-Projection Stereolithography

Mao

Miyazaki

Sakai

et al. 2018

Preprint

Self Cite

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Most of the phase change materials (PCMs) have been limited to use as functional additions or sealed in containers, and extra auxiliary equipment or supporting matrix is needed. The emergence of 3D printing technique has dramatically advanced the developments of materials and simplified production processes. This study focuses on a novel strategy to model thermal energy storage crystalline gels with three-dimensional architecture directly from liquid resin without supporting materials through light-induced polymerization 3D printing technique. A mask-projection stereolithography printer was used to measure the 3D printing test, and the printable characters of crystalline thermal energy storage P(SA-DMAA) gels with different molar ratios were evaluated. For the P(SA-DMMA) gels with small fraction of SA, the 3D fabrication was realized with higher printing precision both on mili- and micro-meter scales. As a comparison of 3D printed samples, P(SA-DMAA) gels made by other two methods, post-UV curing treatment after 3D printing and UV curing using conventional mold, were prepared. The 3D printed P(SA-DMAA) gels shown high crystallinity. Post–UV curing treatment was beneficial to full curing of 3D printed gels, but did not lead to the further improvement of crystal structure to get higher crystallinity. The P(SA-DMAA) crystalline gel having the highest energy storage enthalpy that reached 69.6 J·g−1 was developed. Its good thermoregulation property in the temperature range from 25 to 40 °C was proved. The P(SA-DMAA) gels are feasible for practical applications as one kind of 3D printing material with thermal energy storage and thermoregulation functionality.

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Excellent thermal stability P(BeA-co-MMA) microcapsules with high thermal energy storage capacity

Cited by 21 publications

References 27 publications

Material encapsulation in poly(methyl methacrylate) shell: A review

Material encapsulation in poly(methyl methacrylate) shell: A review

Crystal Transition Behavior and Thermal Properties of Thermal-Energy-Storage Copolymer Materials with N-Behenyl Side-Chain

A 3D Printable Thermal Energy Storage Crystalline Gel Using Mask-Projection Stereolithography

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