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Viscous liquids like supercooled glass-forming materials and molten polymers
often show the so-called long-range density fluctuations or Fischer
cluster with correlation length of several hundreds nm. This long-range
density fluctuations are causes of turbidity because of the size comparable
with visible light. We are studying the long-range density fluctuations
by means of static and dynamic light scattering.
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Speckle of supercooled OTP
Formation process
of Fischer cluster
of Fischer cluster
Ultra-slow process
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Fischer cluster is observed as speckle.
upper: with Fischer cluster
lower： without Fischer cluster
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Acta. Polym., 45, 137(1994) Macromolecules, 28, 7831 (1995)
Phys. Rev., E64, 31503 (2001)
AIP Conference Series, 708, 691 (2004)
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Formation process of Fischer cluster after T-jump from 120 °C to 40 °C.
In case of PMpTS it takes ~35 hour at 35 °C.
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Ultra-slow process is accompanies Fisher cluster. The correlation
time is longer than the ?-process by several order of magnitude.
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Origin: It is considered that Fischer cluster is originated from percolation of quasi-stable solid-like phase below a critical temperature TA.
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