Tokyo Institute of Technology · Chemistry
Professor Takashi Ishizone's research lab specializes in the development of advanced polymerization techniques, particularly anionic and living polymerization, for functional monomers with tailored reactivity and precision. The lab focuses on synthesizing well-defined polymers—such as those derived from acrylamides, vinyl esters, and thiophene-based monomers—enabling precise control over molecular weight, dispersity, and block copolymer architecture. These polymers are systematically explored for applications in organic electronics, including non-volatile memory devices and field-effect transistors, with an emphasis on structure-property relationships in semiconducting materials. The lab also investigates the role of side-chain engineering and stereochemistry in influencing molecular packing and charge transport performance.
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Abstract Anionic polymerization of N ‐methoxymethyl‐ N ‐isopropylacrylamide ( 1 ) was carried out with 1,1‐diphenyl‐3‐methylpentyllithium and diphenylmethyllithium, ‐potassium, and ‐cesium in THF at −78 °C for 2 h in the presence of Et 2 Zn. The poly( 1 )s were quantitatively obtained and possessed the predicted molecular weights based on the feed molar ratios between monomer to initiators and narrow molecular weight distributions ( M w / M n = 1.1). The living character of propagating carbanion
The anionic polymerization of tert-butyl acrylate (tBA) was carried out with a binary initiator system prepared from diphenylmethyllithium, -potassium, or -cesium (Ph2CHM) and dimethylzinc or diethylzinc in THF at −78 °C. In the absence of dialkylzinc (R2Zn), the poly(tBA)s produced with Ph2CHM possessed ill-controlled molecular weights and broad molecular weight distributions (MWDs). On the other hand, poly(tBA)s having predicted molecular weights based on the molar ratio of monomer to initiato
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 6. Anionic block copolymerization of styrene derivatives para-substituted with electron-withdrawing groupsTakashi Ishizone, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1993, 26, 25, 6964–6975Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https://pubs.acs.org/doi/10.1021/ma00077a039https://doi.org/10.10
We report the synthesis of poly(5-hexyl-2-vinylthiophene) (PVT) and poly(5-hexyl-5′′-vinyl-2,2′:5,2′′-terthiophene) (PVTT) as charge storage electrets for nonvolatile organic field effect transistor (OFET) memory devices of n-type semiconducting N,N′-bis(2-phenylethyl)perylene-3,4,9,10-bis(dicarboximide) (BPE-PTCDI). The effects of the conjugated thiophene chain length on the morphology, OFET mobility and memory characteristics are explored and compared to those of the styrene or fluorene side c
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtection and polymerization of functional monomers. 13. Anionic living polymerization of tert-butyl 4-vinylbenzoateTakashi Ishizone, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1989, 22, 7, 2895–2901Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989https://pubs.acs.org/doi/10.1021/ma00197a004https://doi.org/10.1021/ma00197a004research-articleACS PublicationsRequest reuse per
A series of well-defined amphiphilic block copolymers containing poly[oligo(ethylene glycol) methacrylate] (POEGMA)) segments were synthesized by the sequential anionic copolymerization of styrene and trialkylsilyl-protected oligo(ethylene glycol) methacrylates followed by deprotection. OEGMA monomers possessed terminal OH groups on the pendant side chains and included the esters of ethylene glycol, di(ethylene glycol), and tri(ethylene glycol) to change the polarity of hydrophilic polymethacryl
Abstract Anionic polymerizations of 1‐adamantyl methacrylate ( 1 ) and 3‐methacryloyloxy‐1,1′‐biadamantane ( 2 ) were carried out in THF at −50 to −78 °C for 24 h. The initiator employed was either [1,1‐bis(4′‐trimethylsilylphenyl)‐3‐methylpentyl]lithium ( 3 )/lithium chloride, or diphenylmethylpotassium. The polymerizations of 1 and 2 proceeded quantitatively to afford the polymers having the predicted molecular weights based on the molar ratios of monomers and initiators and the narrow molecul
2-[2-[(tert-Butyldimethylsilyl)oxy]ethoxy]ethyl methacrylate (2) and 2-[2-[2-[(tert-butyldimethylsilyl)oxy]ethoxy]ethoxy]ethyl methacrylate (3) were polymerized anionically in THF at −78 °C for 2−24 h. The anionic initiator systems included 1,1-diphenyl-3-methylpentyllithium/lithium chloride and diphenylmethylpotassium/diethylzinc. The polymerization of novel tert-butyldimethylsilyl-protected oligo(ethylene glycol) methacrylates, 2 and 3, proceeded quantitatively in each case. The resulting poly
The anionic polymerizations of 4-, 3-, and 2-(3,3-dimethyl-1-butynyl)styrenes (3a, 3b, and 3c), 4-, 3-, and 2-(1-hexynyl)styrenes (4a, 4b, and 4c), and 4-(phenylethynyl)styrene (5) were carried out in THF at −78 °C with oligo(α-methylstyryl)dipotassium and sec-butyllithium. The polymerizations of these monomers proceeded quantitatively at −78 °C for 0.5 h. The resulting polymers all possessed the predicted molecular weights based on the molar ratios of monomer to initiator and the narrow molecul
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 5. Anionic polymerizations of 2-, 3-, and 4-cyanostyreneTakashi Ishizone, Kenji Sugiyama, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1993, 26, 12, 3009–3018Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10.1021/ma00064a003https://doi.org/10.1021/ma00064a003research-articleACS Publicat
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 4. Anionic living polymerization of N,N-dialkyl-4-vinylbenzenesulfonamidesTakashi Ishizone, Junji Tsuchiya, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1992, 25, 19, 4840–4847Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/doi/10.1021/ma00045a002https://doi.org/10.1021/ma00045a002
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Poly(1,3-adamantane)s by Cationic Ring-Opening Polymerization of 1,3-DehydroadamantanesTakashi Ishizone, Shin-ichi Matsuoka, Shiko Sakai, Wataru Harada, and Hiroyuki TajimaView Author Information Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-H-119, Ohokayama, Meguro-ku, Tokyo 152-8552, Japan Cite this: Macromolecule
The anionic polymerization of N-methoxymethyl-N-isopropylacrylamide (1) was carried out with diphenylmethylpotassium in the presence of Et2Zn in tetrahydrofuran at −78 °C for 20 h. Poly(1)s, having predicted molecular weights and narrow molecular weight distributions (weight-average molecular weight/number-average molecular weight < 1.1), were obtained in quantitative yields. The methoxymethyl protecting group of the resultant poly(1)s was completely removed, and this yielded poly(N-isopropylacr
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