Title <States and Structures> Polymer Condensed States

Author(s)

Citation ICR annual report (2004), 10: 6-7

Issue Date 2004-03

URL http://hdl.handle.net/2433/65412

Right

Type Article

Textversion publisher

Kyoto University

ProfKOHJIYA, Sbinzo

(DEng)

AssocProfTSUJI, Masaki

(DEng)

InstrTOSAKA, Masatoshi

(DEng)

InstrSENOO, Kazunobu

(DEng)

StudenrtsNAKAO, Toshio (D3)ARAI, Yuko (D2)MIKI, Takashi (M2)KITANO, Hirohumi (UG)

KOJIMA, Masaaki (03)POOMPRADUB, Sirilux (D2)OGAWA, Teppei (Ml)MATSUDA, Shota (UG)

YosmOKA, Taiyo (D3)ATSUMI, Kunihiro (M2)FURUTANI, Masahiro (Ml)

VIsitorDr COOK, Stuart The Tun Abdul Ra.zak. Research Centre, United Kingdom, 14 November 2003

Attempts have been made to elucidate the molecular arrangement and the mechanism of structural formation/change

in crystalline polymer solids, polymer gels and elastomers, polymer liquid crystals, and polymer composites, mainlyby electron microscopy and/or X-ray diffraction/scattering. The major subjects are: synthesis and structural analysisof polymer composite materials, preparation and characterization of polymer gels and elastomeric materials, structuralanalysis of crystalline polymer solids by direct observation at molecular level resolution, and in situ studies on structuralformation/change in crystalline polymer solids.

Presentatio 8

TEM studies on thin films of natural rubber and poly­chloroprene crystallized under molecular orientation, TsujiM, Shimizu T, Tosaka M, Kohjiya S, The 9th InternationalSeminar on Elastomers (lSE 2(03), Kyoto, 2 - 4 April andother 8 presentations.

Elastomeric branched poly(ethylene oxide) as a matrixfor functionality materials, Kohjiya S, Ikeda 'Y, Meeting ofthe Rubber Division, American Chemical Society, Sanfran­

cisco, California, USA, 28 - 30 April.Crystallization of natural rubber during drawing as

evaluated by synchrotron X-ray di:ffi."action method - Rela­

tionship between structural development and mechanicalproperties -, Murakami S, Atsumi K, Senoo K, Kohjiya S,Kotera M, Toki S, Spring Meeting, The Society ofPolymerScience, Japan, Nagoya, 28 - 30 May and other 5 presenta­

tions.

Morphological study by TEM on uniaxially orientedthin films of PET, PEN and their blends, Yoshioka T, TsujiM, Kawahara 'Y, Kohjiya S, Polymer Processing Society(PPS-19), Melbourne, Australia, 7 -10 July.

Novel polymer electrolytes based on branchedpoly(oxyethylene) and inorganic sulfide glass, Kohjiya S,

European Congress and Exhibition on Advanced Materialsand Processes (EUROMAT 2(03), Lausanne, Switzerland,

1 - 5 September.Reinforcing effect of silica generated in situ on general

purpose grade rubbers, Kohjiya S, Ikeda Y, Euro Fillers

2003, Alicante, Spain, 8 - II September.Strain-induced crystallization and physical properties of

natural rubber, Kohjiya S, Tosaka M, Murakami S, Poom­pradub S, Ikeda Y, Toki S, Sics I, Hsiao B, Autumn Meet­ing, The Society of Polymer Science, Japan, Yamaguchi,

6 TOPICS AND INTRODUCTORY COLUMNS OF LABORATORIES-----

Figure 1. Sequential change ofWAXD patterns from NR-4. Stretching direction is vertical. C=sponding strain values are indicated at the right bottomin parts (a) to (g) of the figure. Part (h) shows the enlarged image ofthe center ofpart (b). ShaIp reflections from filtty acids are recognized on both sidesofthe beamstop (s = 0.24).

Orientation and crystallization of naturalrubber network as revealed by WAXD usingsynchrotron radiation

Strain-induced crystallization of natural rubber sampleswith various network-chain densities, n, was investigatedby synchrotron X-ray diffraction measurements. It wasfound that the onset strain of crystallization was almostindependent of n. Lateral crystallite size and degree oforientational fluctuation of crystallites were also evaluated.Result indicated that stretched molecular chains acted asnuclei while surrounding chains could contribute to the

24 - 26 September and other 5 presentations.Effect of network-chain length on strain-induced crys­

tallization ofNR and IR vulcanizates, Kohjiya S, Tosaka M,Murakami S, Poompradub S, Ikeda Y, Toki S, Sics I, HsiaoB, The 164th Fall Technical Meeting ofRubber Division,ACS, Cleveland, Ohio, USA, 14 - 17 October.

Role of fatty acids in strain-induced crystallization ofnatural rubber, Tosaka M, Kyoto University Alliance forChemistry 21st Century COE Program, Elucidation ofnano structures and properties of elastomeric materials,Uji, Kyoto, 14 November.

Natural Rubber: A strategic materials and its future, Ko­hjiya S, 8th Pacific Polymer Conference, Bangkok, Thai­land, 24 - 27 November.

growing crystallites. Deformation ofcrystal lattice with ap­plied stress was detected and the strain-induced crystalliteswere found to be responsible for the increased modulusupon elongation. The unit cell volume decreased almostlinearly with applied stress.

Therefore, the compressive stress in the direction per­pendicular to the macroscopic stretching direction must bedominant during the deformation of strain-induced crystal­lites. The reinforcement effect of the crystallites is thoughtto be brought out not directly from crystallites connectedin series but indirectly through the surrounding networkchains compressing the crystallites.

Direct observation offine structures in crystalline solidsofpolymers, Tsuji M, 13-th Symposium on Polymeric Ma­terials, Kyoto, 5 December.

GrantsKohjiya S, Role of polymers in all solid-state ionic de­

vices, Grant-in-Aid for Scientific Research, Priority Area(B), 1April 1999 - 31 March 2004.

Kohjiya S, Stress-induced crystallization behavior ofnatural rubber, Grant-in-Aid for Scientific Research, (B)(3),1 April 2003 - 31 March 2005.

Tsuji M, Analysis of internal fine structure of the high­speed spun fibers for PETIPEN blends. Grant-in -Aid firScientific Research (C) (2), 1April 2002 - 31 March 2004.

ICRANNUAL REPORT, 2003 _7 _