2007 Fiscal Year Final Research Report Summary
Preparation of capsule particles by self-assembling phase separated polymer method and its application
| Project/Area Number |
17201025
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanomaterials/Nanobioscience
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| Research Institution | Kobe University |
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Principal Investigator |
OKUBO Masayoshi Kobe University, Graduate School of Engineering, professor (30031131)
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| Co-Investigator(Kenkyū-buntansha) |
MINAMI Hideto Kobe University, Graduate School of Engineering, Associate Professor (20283872)
ZETTERLUND Per B Kobe University, Graduate School of Engineering, Associate Professor (20322365)
SUZUKI Toyoko Kobe University, Graduate School of Engineering, Research associate (40314504)
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| Project Period (FY) |
2005 – 2007
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| Keywords | (Multi-) Hollow Polymer Particles / Capsule Particle / Sapsep Method / Polvdivinvlbenzene / Heat Storage Materials / Hexadecane / Micro-Suspension Polymerization / Self-Assembling |
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| Research Abstract |
We have proposed the preparation method for micron-sized, cross-linked polystyrene/polydivinylbenzene (PS/PDVB) particles having a single hollow. The mechanism for the hollow polymer particles was based on the Self-assembling of Phase Separated Polymer at an interface with aqueous media, which was named the SaPSeP method. Recently, when the SaPSeP method was applied in the presence of sodium dodecyl sulfate (SDS), it was found that a single hole was formed in the shell of the hollow PS/PDVB composite particles.
In this research, in order to clarify such a strange phenomenon, preparations of capsule particles were examined in detail. It was clarified that the phase separation in the droplets in the early stage of the polymerization was one of key factors for the formation of the single hole. Hole was most likely formed as a result of reduced microgel adsorption at oil-water interface domains of high SDS content. Moreover, we succeeded in preparing submicrometer-sized hollow PS particles, microcapsules containing curing agent for epoxy resin, and PDVB particles with encapsulated titanium oxide or n-hexadecane (HD)by micro-suspension polymerization utilizing the SaPSeP method. HD is useful for heat storage materials. The encapsulation of HD has many advantages that provide large heat transfer area and control the volume change of the heat storage materials. However, there were some problems in encapsulated HD such as decrease of the heat of solidification and supercooling. In this research, the problem in the application of the polymer particles with encapsulated HD as heat storage material was improved by the copolymerization of hydrophilic acrylic monomer. This seems to be based on that the copolymerizations of hydrophilic monomer enhance the phase separation of copolymer chains and HD, eventually resulting in the complete isolation of the HD core from the polymer shell.
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[Presentation] Effects of end groups derived from initiator and nonionic emulsifier on formation of multihollow structure inside polystyrene particles by heat treatment2007
Author(s)
Mineho, Moritaka, Hiroshi, Kobayashi, Eri, Takano, Toyoko, Suzuki, Masayoshi, Okubo
Organizer
The 10th Pacific Polymer Conference(PPC10)
Place of Presentation
Kobe, Japan
Year and Date
20071200
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Influence of HLB value of nonionic emulsifiers on the distribution of carboxyl groups within styrene-methacrylic acid copolymer particles prepared by emulsion copolymerization2006
Author(s)
Amom, Chaiyasat, Masahiro, Yamada, Toyoko, Suzuki, Hiroshi, Kobayashi, Masayoshi, Okubo
Organizer
ICAPP2007-The 2nd Intemational Conference on Advances in Petrochemicals and Polymers
Place of Presentation
Bangkok, Thailand
Year and Date
20060600
Description
「研究成果報告書概要(欧文)」より
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