Dynamics of shear-induced alignment of a lamellar diblock: A rheo-optical, electron microscopy, and X-ray scattering study

Macromolecules

Volumn 30, Issue 23, 1997, Pages 7096-7114

  Chen, Z R ^a   Issaian, A M ^a   Kornfield, J A ^a   Smith, S D ^b   Grothaus, J T ^b   Satkowski, M M ^b  

^a California Institute of Technology ^*  (United States)

^b PROCTER AND GAMBLE COMPANY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CHARACTERIZATION; NANOSTRUCTURED MATERIALS; POLYISOPRENES; POLYSTYRENES; TRANSMISSION ELECTRON MICROSCOPY;

FLOW BIREFRINGENCE; LAMELLAR BLOCK COPOLYMER; RHEO OPTICAL METHOD; X RAY SCATTERING;

BLOCK COPOLYMERS;

EID: 0031273672     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma9706743     Document Type: Article

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49. o = 0.5 and 0.7). This suggests that the flow-induced anisotropy of the chains produces a 1,3-birefringence contribution that has a magnitude less than 1/1000th of the form birefringence associated with the evolution of the lamellar orientation distribution.
50. To evaluate the effect of equilibration time on the initial state, we examined TEM micrographs of a sample that was annealed at 115 °C for 24 h and compared them with TEM micrographs of a sample that was annealed for 15 min (see Figure 4). Surprisingly, almost no difference was found in terms of their textures, morphologies, and percentages of poorly organized material. We observed that annealing time did not change the alignment trajectory. A small effect can be detected in the rate of orientation, with longer annealing times producing slightly faster alignment.
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