Figure 6.

Sensitivity of the shear-triggered crystallization. (A) Applied shear rate and stress on the supercooled liquid DPP8 under a rheometer (ca. 29 °C). Nucleation by shearing was first observed at the applied shear rate of 0.03 s^–1 (shear stress of 0.90 kPa). (B) Experimental rheometer setup to quantitatively analyze the threshold shear rate to trigger nucleation. (C) Images of DPP8 sample on the bottom plate after applying each shear rate followed by heating to 100 °C. No crystallization was observed up to the shear rate of 0.025 s^–1 (shear stress 0.74 kPa). At the shear rate 0.03 s^–1 and above, crystallization was clearly observed due to crystal nucleation induced by the applied shearing. Photographs (B and C) were taken under room light.