PMC

COSY spectrum of poly-7 prepared with 2 in the olefinic proton region. The absence of olefinic coupling suggests that the polymer is syndiotactic.

Top: structure of syndiotactic poly(ethylidene acetate) (left) and its aggregation into a triple helix (right). Bottom: proposed aggregation of syndiotactic pM₅ in water occurring at lower temperature than aggregation of its atactic analogue due to formation of more densely packed aggregates, thus releasing more water molecules involved in solvation of individual polymer chains upon aggregate formation, leading to larger entropy contributions.

(A) Preparation procedure for monolithic polymer/r-GO aerogel: dispersion of GO into an organic solvent before (a) and after (b) sonication at 100 °C for 2 h in step one; (c) stable self-standing gel formed after adding the polymer to the dispersion of GO and the dissolution of the polymer at high temperature; (d) monolithic aerogel of polymer/r-GO nanocomposites fabricated by supercritical carbon dioxide (scCO₂) extraction of gels obtained in step two. (B) Three syndiotactic polystyrene (sPS)/r-GO aerogel pillars (porosity = 90%) supporting 100 g.

HRTEM and WAXS analysis of nanocaged TiO₂ quantum dots (QDs) in polystyrene (PS). (a) HRTEM imaging of nanocaged of TiO₂ QDs at the metal oxide and polystyrene interface. The nanocages are shown within the yellow borders typically in the size range of 1.25–2.81 nm (b) Deconvoluted WAXS pattern of polystyrene nanocaged TiO₂ QDs in 1:20 fold ethanol exhibiting a crystal syndiotactic phase of the polymer and orthorhombic rutile TiO₂ phase. (c) Dislocations at the boundary interface of crystal growth often lead to (d) deformities to reduce surface energy.