Hydrogen‐Bonded Polymer–Small Molecule Complexes with Tunable Mechanical Properties

Macromolecular Rapid Communications - Tập 39 Số 9 - 2018
Tianqi Liu1, Xin Peng1, Yanan Chen1, Qingwen Bai1, Cong Shang1, Lin Zhang2, Huiliang Wang1
1Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
2Department of Chemical and Material Engineering, Yingkou Institute of Technology, Yingkou, Liaoning, 115000 P. R. China

Tóm tắt

AbstractA novel type of polymeric material with tunable mechanical properties is fabricated from polymers and small molecules that can form hydrogen‐bonded intermolecular complexes (IMCs). In this work, poly(vinyl alcohol) (PVA)–glycerol hydrogels are first prepared, and then they are dried to form IMCs. The tensile strengths and moduli of IMCs decrease dramatically with increasing glycerol content, while the elongations increase gradually. The mechanical properties are comparable with or even superior to those of common engineering plastics and rubbers. The IMCs with high glycerol content also show excellent flexibility and cold‐resistance at subzero temperatures. Cyclic tensile and stress relaxation tests prove that there is an effective energy dissipation mechanism in IMCs and dynamic mechanical analysis confirms their physical crosslinking nature. FTIR and NMR characterizations prove the existence of hydrogen bonding between glycerol and PVA chains, which suppresses the crystallization of PVA from X‐ray diffraction measurement. These PVA–glycerol IMCs may find potential applications in barrier films, biomedical packaging, etc., in the future.

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Macromolecular Rapid Communications

Tập 39 Số 9

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