Figure 4.

Cartoon depicting the order parameter of the LLT and crystallization in TPP. The horizontal axis is the order parameter, which goes from parallel π-stacking of the phenoxy rings on neighboring molecules on the left (π) to T-shaped stacking on the right (τ). The vertical axis represents the quenching temperature. Solid lines show the four relevant forms of TPP (liquid 1, liquid 2, crystal 1, and crystal 2), and colored arrows the transitions between them, with the thickness of the arrow indicating the relative probability of a transition. Liquid 2 is formed from liquid 1 through nucleation and growth (N&G) and spinodal decomposition (SD). Liquid 1 has a glass-transition temperature T_g,1 ≅ 203 K,²³ while that of liquid 2 is T_g,2 ≅ 226 K.