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論文

Polymer photonic crystals prepared by triblock copolymerization-induced ${it in situ}$ microphase separation

磯崎 祐嘉*; 東原口 誠也*; 金子 直矢*; 山崎 駿*; 谷口 竜王*; 唐津 孝*; 上田 祐生; 元川 竜平

Chemistry Letters, 51(6), p.625 - 628, 2022/06

 被引用回数:0 パーセンタイル:32.1(Chemistry, Multidisciplinary)

Polymer photonic crystals (PPCs) that selectively reflect visible light were prepared by triblock polymerization-induced ${it in situ}$ microphase separation via reversible addition-fragmentation chain transfer polymerization. The addition of homopolymer to the polymerization system swelled a specific phase of the microdomains, enabling the preparation of PPCs with long-wavelength structural colors. Small-angle neutron scattering confirmed the increase in the domain spacing of the lamellar microdomains with the addition of homopolymer, while maintaining their morphology.

論文

Photonic crystals fabricated by block copolymerization-induced microphase separation

元川 竜平; 谷口 竜王*; 熊田 高之; 飯田 優羽*; 青柳 翔太*; 佐々木 祐亮*; 桑折 道済*; 岸川 圭希*

Macromolecules, 49(16), p.6041 - 6049, 2016/08

 被引用回数:18 パーセンタイル:58.91(Polymer Science)

We present a method for fabricating photonic crystals (PCs) by polymerization-induced microphase separation of block copolymers (BCPs). Molecular weight of BCP for PCs is so large that it has been difficult for conventional solution casting and annealing methods to complete the microphase separation to form periodically-ordered submicron structures. Our method overcomes the difficulty by inducing the micro phase separation and transitions during the polymerization, when the molecular weight of the BCPs is small enough for the microphase separation and transitions. The microphase-separated structure is then enlarged while maintaining the self-similarity. We succeeded in fabricating PCs with reflection wavelength $$lambda$$m $$approx$$ 1000 nm and a full width at half maximum $$lambda$$ = 0.05 $$lambda$$m by living-radical bulk block-copolymerization of poly(methyl methacrylate)-block-polystyrene.

論文

Small-angle neutron scattering study on specific polymerization loci induced by a copolymerization of polymerizable surfactant and styrene during miniemulsion polymerization

元川 竜平; 谷口 竜王*; 佐々木 祐亮*; 榎本 勇人*; 村上 史泰*; 春谷 昌克*; 桑折 道済*; 中平 隆幸*

Macromolecules, 45(23), p.9435 - 9444, 2012/11

 被引用回数:9 パーセンタイル:30.29(Polymer Science)

We have investigated the origin of a specific polymerization locus that yielded copolymer particles with a bimodal gel permeation chromatographic profile in the early stage of miniemulsion polymerization of styrene (St) with C$$_{12}$$DMAEMA. The formation of particles by miniemulsion polymerization using C$$_{12}$$DMAEMA was investigated as a function of the polymerization time ($$t$$$$_{rm p}$$), and was compared with that using the non-polymerizable surfactant CTAB. GPC and elemental analysis indirectly predicted two different polymerization loci in the St/C$$_{12}$$DMAEMA/V50 polymerization system. Time-resolved SANS was used to directly observe and examine the specific polymerization loci in the miniemulsion polymerization solutions. The droplets formed in St/C$$_{12}$$DMAEMA/V50/PSt hydrophobe at the initial stage of the polymerization were not fully stabilized by C$$_{12}$$DMAEMA and poly(C$$_{12}$$DMAEMA-ran-St), and were found to build up the large aggregates. The spherical droplets were stabilized later in tp $$>$$ 20 min by forming a homogeneous dispersion in the water phase. Porod analysis of the power law scattering observed by SANS provided direct evidence for the specific polymerization loci, which appeared in the early stage of the polymerization system of St/C$$_{12}$$DMAEMA/V50/PSt hydrophobe on the surface of the droplet, and was the origin of the bimodal peaks in the GPC chromatogram.

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