Synthesis and polymerization of cyclic formals of oligooxyethylene diols

Abstract

Polymers of general formula [−(CH2CH2O)m‐CH2O‐]n with well‐defined m value may be obtained by cationic ring‐opening polymerization of easily available cyclic formals of di‐, tri‐, tetra‐, penta‐ (and possibly higher) ethylene glycols. There are no significant kinetic or thermodynamic restrictions for their polymerization. Polymers with [(‐CH2CH2O)m‐CH2O‐]n structure may be treated as intermediates between polymers of ethylene oxide (POE) and polymers of 1,3‐dioxolane (PDXL), both of which find applications in the biomedical field as well as components of solid polymer electrolytes. Largely unexploited [(‐CH2CH2O)m‐CH2O‐]n polymers may broaden the scope of the application of polyacetals in both these areas.

Scalable, Waterproof, Breathable, and Flexible Polyolefin-Elastomer/Polyethylene Glycol@Zinc Oxide Microfibrous Fabrics for Daytime Radiative Cooling Clothing

“…The structure characteristic parameters of the fiber orientation angle distribution (Figure S5) and fiber diameter distribution of the prepared PP/POE@ZnO microfibrous fabrics with different ZnO mass ratios are displayed in Figure d,e. In this work, benefiting from the separation effect of PEG and the phase separation of blends, the fiber diameter was concentrated in the range of 1–18 μm, and there are two peaks around 2.5 and 10 μm, respectively. This attractive binary fiber diameter distribution is beneficial for enhancing softness while maintaining mechanical performance (Figure S6).…”