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Volumn 29, Issue 3, 1996, Pages 875-884

Dynamics of shear alignment in a lamellar diblock copolymer: Interplay of frequency, strain amplitude, and temperature

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EID: 0001521524     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma950925c     Document Type: Article
Times cited : (97)

References (49)
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    • In the microphase-separated state for block copolymers a small apparent birefringence results from depolarization of the polarized light upon transmission through a collection of randomly oriented lamellar grains.
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    • For reasonable flow geometries, the 1,2-projection results in a retardation over too many orders due to the large path length (∼15 mm in our experiments).
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    • The procedure of preparing samples for SAXS is subject to variations in the samples and in the temperature controller, uncertainties in the precise sample geometry from sample to sample, possible distortion of the aligned structure during cooling and unloading, and, for the SAXS experiments performed with the beam along either the flow or vorticity directions, effects of cutting the sample.
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    • note
    • 11 However, our transient birefringence results from shearing at 120 °C with strain amplitudes of 0.3 (ω = 10 rad/s) and 0.2 (ω = 100 rad/s) show that while the lamellar distribution has an enhanced projection along the parallel direction, the degree of alignment is not high (Figures 4a and 6a).
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    • note
    • g of the polystyrene-rich microphase) even using strain amplitudes as low as 0.05.
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