ブックタイトル高分子　POLYMERS　62巻12月号

概要

高分子　POLYMERS　62巻12月号

Hot Topics今月号759、760頁にはもう1つのHotなNewsがあります。Awards for Encouragement of Research in Polymer Science given by the Society of Polymer Science, JapanGlassy Behavior of Collapsed Poly(methylmethacrylate) Chains in Dilute SolutionYasuyuki MAKI*, Toshiaki DOBASHI, and Mistuo NAKATADivision of Molecular Science, Faculty of Science and Technology,Gunma UniversityE-mail: maki@gunma-u.ac.jp*Collapse of a polymer chain below theQ temperature (coil-globule transition)has been one of the important topicsin polymer physics. However, the coilglobuletransition has been rarelystudied experimentally because chainaggregation usually occurs in a poorsolvent before the chain collapsing.We have measured the coil-globuletransition of poly(methyl methacrylate)(PMMA) in a mixed solvent (t-butylalcohol, containing 2.5 vol% water)by light scattering, taking advantageof the extremely slow chainaggregation in the dilute PMMAsolution. After a quench of the solutionbelow Q, a slow chain-collapse processwas observed: a chain expansionfactor a 2 decreased slowly for severaldays. In the temperature-shiftprotocol as follows: Q→T 1→T 2→T 1 (Q > T 1 > T 2), a 2 of thecollapsed chain increased immediatelyafter the temperature rise from T 2to T 1, followed by gradual decreasein a 2 (memory effect). The slowchain collapse and the memoryeffect in the temperature shift arereminiscent of aging and hysteresisbehaviors of glassy materials.Kobunshi Ronbunshu, 69, 373 (2012)Synthesis of Poly(arylene ether)s Containing RigidLarge Cyclic Units in the Main ChainKazuya MATSUMOTO* and Mitsutoshi JIKEIDepartment of Applied Chemistry, Graduate School of Engineeringand Resource Science, Akita UniversityE-mail: kmatsu@gipc.akita-u.ac.jp*Cyclic compounds have attractedgreat attention because of theirfunctions such as capture andpermeation of small molecules,which originated from the poresformed by their cyclic structures.However, there are few reports onthe synthesis of rigid large cycliccompounds and polymers containingthe rigid large cyclic structure.We report the synthesis of a novelpoly(arylene ether) containing rigidlarge cyclic structure in the mainchain. A novel large cyclic compoundwas synthesized and used as amonomer. The resulting polymershowed good solubility in organicsolvents and high thermal stabilitydue to its aromatic structure. Theunique architecture of the polymerhas a potential for the application asnano-porous materials.Polymer Preprints, Japan, 61, 2313 (2012)Fig. Synthesis of poly(arylene ether)s containing rigid large cyclicstructure in the main chain.Nanophase-Separated Hybrids of Block Copolymer/Inorganic Nanoparticle via Hydrogen BondingAtsushi NORO*, Kota FURUICHI, Yoshio SAGESHIMA,and Yushu MATSUSHITADepartment of Applied Chemistry, Graduate School of Engineering,Nagoya UniversityE-mail: noro@apchem.nagoya-u.ac.jp*Well-ordered periodic nanostructureshave been attaining much attentiondue to their high potential formany nano-applications. Nanophaseseparatedstructures of blockcopolymer/inorganic nanoparticlehybrids are one of the best candidatesfor such applications. As shown in theright figure, we recently demonstratedpreparation of macroscopicallyhomogeneous hybrids composed ofa polystyrene-b-poly(4-vinylpyridine)(PS-P4VP) block copolymer andhydroxy-capped cadmium selenidenanoparticles (h-CdSe) via hydrogenbonding. A hybrid composed ofh-CdSe and PS-P4VP bearing longP4VP blocks represented a singlephase-separated structure at thenanometer scale, which resulted fromhydrogen bonding between pyridineand hydroxy groups. Althoughmacrophase separation accompaniedby overflow of h-CdSe fromnanophaseseparated domains wasalso observed in hybrids containingPS-P4VP with short P4VP blocks,this is attributed to the stoichiometricbalance of functional groups.Polymer Preprints, Japan, 61, 3282(2012)Macromolecules, 45, 8013 (2012)高分子62巻12月号（2013年）c2013 The Society of Polymer Science, Japan725