3 years ago

Flexible Poly(vinyl chloride) Nanocomposites Reinforced with Hyperbranched Polyglycerol–Functionalized Graphene Oxide for Enhanced Gas Barrier Performance

Flexible Poly(vinyl chloride) Nanocomposites Reinforced with Hyperbranched Polyglycerol–Functionalized Graphene Oxide for Enhanced Gas Barrier Performance
Jae Woo Chung, Seung-Yeop Kwak, Kyu Won Lee
Herein, we describe the preparation of flexible poly(vinyl chloride) (PVC) containing hyperbranched polyglycerol (HPG)-functionalized graphene oxide (HGO) as a reinforcing filler and reveal that the obtained composites exhibit greatly improved gas barrier properties. Moreover, we show that HGO, synthesized by surface-initiated ring-opening polymerization of glycidol followed by esterification with butyric anhydride, exists as individual exfoliated nanosheets possessing abundant functional groups capable of interacting with PVC. A comparative study of butyl-terminated graphene oxide (BGO) reveals that functionalization with HPG is of key importance for achieving a uniform dispersion of HGO in the PVC matrix and results in strong interfacial interactions between HGO and PVC. As a result, flexible PVC/HGO nanocomposite films exhibit significantly enhanced tensile strength and toughness compared to those of neat plasticized PVC while maintaining its inherent stretchability. Furthermore, the two-dimensional planar structure and homogeneous distribution of HGO in PVC/HGO nanocomposites make gas molecules follow a highly tortuous path, resulting in remarkably reduced oxygen permeability, which is more than 60% lower than that of neat plasticized PVC. Consequently, HGO is demonstrated to be promising component of flexible and gas-impermeable PVC films for a wide range of applications.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b10257

DOI: 10.1021/acsami.7b10257

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