Strain-Phase-Resolved Dynamic SAXS Studies of BCC-Spherical Domains in Block Copolymers under LAOS: Creation of Twinned BCC-Sphere and Their Dynamic Response
Strain-Phase-Resolved Dynamic SAXS Studies of BCC-Spherical Domains in Block Copolymers under LAOS: Creation of Twinned BCC-Sphere and Their Dynamic Response
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LAOS 下嵌段共聚物中 BCC 球域的应变相分辨动态 SAXS 研究：孪生 BCC 球的创建及其动态响应
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发表时间：
2013
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影响因子：
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通讯作者：
Kazuki Ito
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作者：
K. Saijo;Gakuji Shin;T. Hashimoto;Y. Amemiya;Kazuki Ito
我们施加了一个大振幅振荡剪切变形（LAOS）的聚苯乙烯-嵌段-聚异戊二烯-嵌段-聚苯乙烯，其中有近随机取向的颗粒的体心立方晶格的球形微区（BCC球）之前，应用LAOS。力学和结构的BCC球的响应，同时测量作为一个函数的应变相位和振荡应变周期N的数量通过剪切应力测量和应变相位分辨动态小角X射线散射（DSAXS）。DSAXS揭示了以下证据：（1）LAOS首先使BCC球获得A球和A ′球以及B球和B ′球定义的两组特定取向，其中A球和A ′球以及B球和B ′球都关于平行于剪切面的{112}点阵面镜像对称（OX-和OZ-轴分别定义为剪切方向和涡量或中性轴的OZZ-平面）或A-和A ′-球的OXY-平面。
We applied a large-amplitude oscillatory shear deformation (LAOS) to polystyrene-block-polyisoprene-block-polystyrene which had nearly randomly oriented grains of body-center-cubic lattice of spherical microdomains (BCC-sphere) before applying LAOS. Mechanical and structural responses of the BCC-sphere were simultaneously measured as a function strain phase ϕ and number of oscillatory strain cycles N by means of shear stress measurements and strain-phase-resolved dynamic small-angle X-ray scattering (DSAXS). The DSAXS revealed the following pieces of evidence: (1) LAOS first leads the BCC-sphere to attain two sets of the specific orientations as defined by A- and A′-sphere and by B- and B′-sphere, where both A- and A′-sphere and B- and B′-sphere are in the mirror symmetry with respect to {112} lattice plane which is parallel to the shear plane (the OXZ-plane with the OX- and OZ-axis defined as the shear direction and vorticity or neutral axis, respectively) for A- and A′-sphere or to the OXY-plane with th...