Thank you for visiting nature.com. You are using a browser version with
limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off
compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site
Thickness changes in polyvinyl acetate thin films, during the temperature cycle across the glass transition temperature (Tg) has been studied in detail. Even after enough thermal treatment done at the high-temperature side of Tg, thickness increase during cooling (negative thermal expansion) is observed. On the other hand, slow thickness decrease is observed with aging at the high-temperature side of Tg. The above interesting phenomena can be well explained by the model considering the presence and changes of the interface layer.
Gas transport properties of novel polybenzoxazole (PBO)—silica hybrid membranes prepared via sol–gel rand different thermal treatment protocols were investigated. The hybrid membranes showed enhancements of CO2 permeability and CO2/CH4 selectivity with increasing silica content and thermal treatment temperature. The excellent CO2/CH4 separation ability might be achieved by free volume holes crated around polymer/silica interfacial area and increased intermolecular chain distance.
Increasing the selectivity of desalination membranes is of crucial importance for advancing membrane desalination technologies. Here the authors demonstrate a plasticizing-extracting process for tuning the permselectivity of polymeric membranes and achieving desired desalination performance.
Salt concentration dependence of NaPSS polymacromonomer with 110 monomeric units on each side chain (unfilled circles) cannot be explained by the theory assuming the Debye–Hűckel (DH) potential under the ionic strength outside the brush (dotted line), but can be explained using the DH potential under the ionic strength inside the brush (dashed line) along with the interactions without ionic ones (dot-dashed line).
Digital polymers with precisely ordered units for next-generation data storage media are continually investigated for higher storage capacity. Here the authors show the synthesis of information-coded 2D digital dendrimers and the generated data matrix barcode can be read by a common hand-held device.
Understanding the dynamics of ring polymers is challenging are despite recent progress, understanding of the nonequilibrium behavior of ring polymers has not yet been achieved. Here, the authors directly observe the flow dynamics of DNA-based rings in semidilute linear polymer solutions using single molecule techniques.
The combination of addressable synthetic macromolecules with proteins of precise structure and function often leads to materials with unique properties, as is now shown by the efficient multi-site initiation of polymer growth inside the cavity of a virus capsid.
Two-dimensional polymers can serve to organize chemical functionality periodically over large areas, but their rational synthesis has remained limited. Now, a free-standing, single-layer polymer sheet has been prepared and isolated through a two-step procedure — a photochemical reaction within a layered organic crystal followed by exfoliation.