イケハラ タカユキ   Ikehara Takayuki
  池原 飛之
   所属   神奈川大学  工学部 物質生命化学科
    神奈川大学大学院  工学研究科 工学専攻(応用化学領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2010/06
形態種別 学術雑誌
査読 査読あり
標題 Aggregation, Gelation Instability, and Morphologies of Diblock Copolymers Consisting of Poly(p-benzamide) and poly(m-benzamide)
執筆形態 共著
掲載誌名 Journal of Polymer Science Part B: Polymer Physics
巻・号・頁 48(15),1732-1739頁
著者・共著者 Toshiyuki Kataoka, Tomoyuki Ohishi, Tsutomu Yokozawa, Takayuki Ikehara
概要 The solution, gelation, and morphological properties of monodisperse aromatic polyamide diblock copolymers consisting of poly(p-benzamide) (PpBA), poly(m-benzamide) (PmBA), and poly(N-octyl m-benzamide) (POmBA) were investigated. The block copolymers of these polymers, PpBA-block-POmBA and PmBA-block-POmBA, formed spherical micelles or amorphous aggregates in many solvents in addition to physical gels at concentrations higher than 5 wt %. A temperature-induced sol-gel transition was also exhibited for PpBA-block-POmBA in solvents with high boiling points such as N,N-dimethylacetamide and N-methylpyrrolidone (NMP), although the transition was not entirely thermoreversible; the transition temperature decreased by annealing at ca. 80 deg. C. Dynamic light scattering measurements of the PpBA-block-POmBA/NMP solutions revealed that metastable micelles in the sol state reorganized into smaller micelles upon annealing at 90 deg. C. The block copolymer, which forms strong associations, exhibited some transient structure as indicated by the need to sufficiently anneal the solution to reach equilibrium. Network-like patterns with characteristic length of ca. 10 micro m appeared on the gel surfaces upon evaporation of volatile solvents such as dichloromethane and chloroform, in which the copolymers were observed to aggregate. The unique properties of the copolymers originate from interactions between the highly polar NH aromatic polyamide blocks.