New Analytical Methods for the Surface/ Interface and the Micro-Structures in Advanced Nanocomposite Materials by Synchrotron Radiation

Nakamae, Katsuhiko; Matsui, Junji; Yokoyama, K.; Urushihara, Yoshimasa; Kuwamoto, S.; Li, L.; Takeda, S.

doi:10.17146/aij.2010.32

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…The wavelength of X-ray was 0.100 nm, and the sample-to-detector distance was 1.3 m. The SAXS measurements were also conducted at BL08B2 in SPring-8 with an exposure time of 10 s by using PILATUS 100 K (DECTRIS Ltd., Baden, Switzerland). The wavelength of X-ray was 0.100 nm, and the sample-to-detector distance was 1.5 m. Refer to the publication in detail for BL40B2 and for BL08B2. , …”

Section: Methodsmentioning

confidence: 99%

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Strain-Induced Deformation of Glassy Spherical Microdomains in Elastomeric Triblock Copolymer Films: Simultaneous Measurements of a Stress–Strain Curve with 2d-SAXS Patterns

Tomita

Urushihara

et al. 2017

Macromolecules

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Thermoplastic elastomers are elastomeric materials which contain hard domains as physical cross-linking for rubbery chains. Therefore, the hard domains are required permanently rigid. Nevertheless, we have found experimentally deformation of the hard domains upon uniaxial stretching of the thermoplastic elastomer films. In this paper, we report experimental results of deformation of glassy spherical microdomains in elastomeric triblock copolymer films upon uniaxial stretching, as revealed by two-dimensional small-angle X-ray scattering (2d-SAXS) measurements. Actually, shifts of the peak position of the particle scattering toward lower and higher q-regions were detected for q directions parallel and perpendicular to the stretching direction (SD), respectively, where q stands for the scattering vector. By assuming that spheres simply deformed into prolate spheroids with its major axis parallel to SD, 1d-SAXS profiles measured at several strains were successfully reproduced with model calculation of the 1d-SAXS profile. From the results of model calculation, radii of the prolate spheroids were appropriately determined. Since the extent of the deformation of microdomains was found to increase as the initial size of microdomains decreased, it is concluded that the deformation of glassy microdomains may be due to a high extent of the stress concentration at microdomains. Upon unloading, the deformed particle scattering peak in the 2d-SAXS pattern was found to retrieve almost a round shape. At a glance, this fact implies that the deformed sphere (prolate spheroid) recovers an isotropic shape. However, this kind of the elastic behavior cannot be the case for the glassy domain. Alternatively, we have tried to explain the change of the 2d-SAXS pattern by orientational relaxation of the prolate spheroids without changing the shape of the prolate spheroids. It was found that such trial was sound.

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Section: Methodsmentioning

confidence: 99%

“…The wavelength of X-ray was 0.100 nm, and the sample-to-detector distance was 1.5 m. Refer to the publication in detail for BL40B2 28 and for BL08B2. 29,30 DSC Measurements. DSC measurements were conducted for the thermally annealed SEBS-8 and SIBS films and for the as-cast film of SEBS-16 to evaluate T g of PS.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Strain-Induced Deformation of Glassy Spherical Microdomains in Elastomeric Triblock Copolymer Films: Simultaneous Measurements of a Stress–Strain Curve with 2d-SAXS Patterns

Tomita

Urushihara

et al. 2017

Macromolecules

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“…A PILATUS 100K (DECTRIS) was used as a two-dimensional detector. The typical exposure time was 100 s. Further details of the SAXS apparatus are available in the literature . The 2d-SAXS patterns were converted to one-dimensional (1d-SAXS) profile by so-called circular average.…”

Section: Experimental Sectionmentioning

confidence: 99%

Supramolecular Elastomers: Self-Assembling Star–Blocks of Soft Polyisobutylene and Hard Oligo(β-alanine) Segments

Scavuzzo

Tomita²,

Cheng

et al. 2015

Macromolecules

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A series of novel self-assembling star-blocks consisting of M w = 29 000 g/mol 3-arm polyisobutylene (PIB) stars and oligo(β-alanine) end segments were synthesized and characterized. Star−blocks containing β-alanine dimers are viscous liquids, while those with tri-, tetra-, and penta(β-alanine)s are elastic solids. According to IR spectroscopy, the β-alanine dimer is partially hydrogen-bonded, while the trimer, tetramer, and pentamer are fully hydrogen-bonded and form β-sheets. DSC suggests crystalline β-alanine trimer tetramer and pentamer domains phase separated from the rubbery PIB. The melting temperature of the crystalline domains increases with the length of the oligo(β-alanine) segment. Transmission electron microscopy, wide-angle X-ray diffraction, and small-angle X-ray scattering of star-blocks containing tetra(β-alanine) indicate stacks of hydrogen-bonded β-sheets dispersed in a soft continuous PIB phase. The crystalline phases form fibrous lamellae with lengths up to ∼200 nm, widths up to ∼20 nm, and thicknesses of ∼2 nm, which is the length of β-alanine tetramer. Although the oligo(β-alanine) contents are very low (from 1.5 to 3.6 wt % in the series), the static and dynamic mechanical properties of the star−blocks are very different. The elastic moduli of the TPEs increase 5-fold with increasing β-alanine content. Evidently, the oligo(β-alanine) domains provide not only physical cross-links but also act as fillers.

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“…Nakamae等人 [52] 发展了利用同步辐射的先进纳米复合材料表面/界面结构和微观结构的分析方法, 掠入图 7 (网络版彩图)微孔洞萌生、连通及扩展过程 [40] Shimomura等人 [53] 通过原位X射线衍射(XRD)对分子束外延过程中InAs量子点(QDs)和各种帽层的生长进行直接测量. 基于在各种晶格常数下获得的XRD 强度瞬变来讨论在封盖期间在QD和盖层中诱导的应变的演化.…”

Section: 卡儿分量以及全部九分量应变张量都能被实验表征unclassified

Experimental research of inside mechanical behavior based on advanced light source

Feng¹,

Hu²

2018

Sci. Sin.-Phys. Mech. Astron.

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Groundbreaking gas source rock correlation research based on the application of a new experimental approach for adsorbed gas Chinese Science Bulletin 57, 4746 (2012); Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project Chinese Science Bulletin 63, 396 (2018); Experimental study on mechanical behavior of high performance concrete under multi-axial compressive stress

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New Analytical Methods for the Surface/ Interface and the Micro-Structures in Advanced Nanocomposite Materials by Synchrotron Radiation

Cited by 4 publications

References 2 publications

Strain-Induced Deformation of Glassy Spherical Microdomains in Elastomeric Triblock Copolymer Films: Simultaneous Measurements of a Stress–Strain Curve with 2d-SAXS Patterns

Strain-Induced Deformation of Glassy Spherical Microdomains in Elastomeric Triblock Copolymer Films: Simultaneous Measurements of a Stress–Strain Curve with 2d-SAXS Patterns

Supramolecular Elastomers: Self-Assembling Star–Blocks of Soft Polyisobutylene and Hard Oligo(β-alanine) Segments

Experimental research of inside mechanical behavior based on advanced light source

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