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RESEARCH PRODUCT

Capillary Imbibition, Crystallization, and Local Dynamics of Hyperbranched Poly(ethylene oxide) Confined to Nanoporous Alumina

Holger FreyGeorge FloudasYasuhito SuzukiHans-jürgen ButtYang YaoJan SeiwertMartin Steinhart

subject

Materials sciencePolymers and PlasticsEthylene oxideNanoporousOrganic ChemistryOxideNucleation02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical scienceslaw.inventionInorganic ChemistryCrystallinitychemistry.chemical_compoundchemistryChemical engineeringlawPolymer chemistryMaterials ChemistryCopolymerImbibitionCrystallization0210 nano-technology

description

The crystallization and dynamics of hyperbranched poly(ethylene oxide) (hbPEO), obtained from the direct random copolymerization of EO and glycidol (PEO-co-PG), are studied both in bulk and within nanoporous alumina (AAO). Copolymerization decreases the degree of crystallinity and lowers the crystallization and melting temperatures as compared to linear PEO. The dynamics of capillary imbibition within AAO followed the t1/2 prediction but is slower than predicted by the classical Lucas–Washburn equation. The most prominent effect of confinement is the change in nucleation mechanism—from heterogeneous nucleation in bulk to homogeneous nucleation inside AAO. The homogeneous nucleation temperatures for the hyperbranched PEOs agree with those of linear ones provided that the branch molecular weight is used instead of the total molecular weight. Confinement and interfacial effects further suppress the degree of crystallinity and speed up the segmental dynamics.

yearjournalcountryeditionlanguage
2017-10-18Macromolecules
https://doi.org/10.1021/acs.macromol.7b01843