Pathways to macroscale order in nanostructured block copolymers

被引:285
作者
Chen, ZR
Kornfield, JA
Smith, SD
Grothaus, JT
Satkowski, MM
机构
[1] CALTECH, PASADENA, CA 91125 USA
[2] PROCTER & GAMBLE CO, MIAMI VALLEY LABS, CINCINNATI, OH 45239 USA
关键词
D O I
10.1126/science.277.5330.1248
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Polymeric materials undergo dramatic changes in orientational order in response to dynamic processes, such as flow. Their rich cascade of dynamics presents opportunities to create and combine distinct alignments of polymeric nanostructures through processing. In situ rheo-optical measurements complemented by ex situ x-ray scattering reveal the physics of three different trajectories to macroscopic alignment of lamellar diblock copolymers during oscillatory shearing. At the highest frequencies, symmetry arguments explain the transient development of a bimodal texture en route to the alignment of layers parallel to the planes of shear. At lower frequencies, larger-scale relaxations introduce rearrangements out of the deformation plane that permit the formation of lamellae perpendicular to the shear plane. These explain the change in the character of the pathway to parallel alignment and the emergence of perpendicular alignment as the frequency decreases.
引用
收藏
页码:1248 / 1253
页数:6
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