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Water transport and clustering behavior in homopolymer and graft copolymer polylactide
Journal article   Peer reviewed

Water transport and clustering behavior in homopolymer and graft copolymer polylactide

An Du, Donghun Koo, Grayce Theryo, Marc A. Hillmyer, Richard A. Cairncross and Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Journal of membrane science, v 396(4, 2012)
01 Apr 2012
DOI: https://doi.org/10.1016/j.memsci.2011.12.030
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Abstract

Clustering Polylactide Water sorption
► Comparison of water sorption in homopolymer polylactide and graft copolymer polylactide. ► Graft copolymer contains 95wt.% poly(d,l-lactide) grafts and 5wt.% hydrophobic rubber backbone. ► Both polymers absorb similar amounts of water: 0.0065g water per gram polymer at 0.80 activity. ► Experiments and theoretical models suggest the presence of water clusters in both polymers. Polylactide is a bio-based and biodegradable polymer well-known for its renewable origins. Water sorption and clustering behavior in both a homopolymer polylactide and a graft copolymer of polylactide was studied using the quartz crystal microbalance/heat conduction calorimetry (QCM/HCC) technique. The graft copolymer, poly(1,5-cyclooctadiene-co-5-norbornene-2-methanol-graft-d,l-lactide), contained polylactide chains (95wt.%) grafted onto a hydrophobic rubbery backbone (5wt.%). Clustering is an important phenomenon in the study of water transport properties in polymers since the presence of water clusters can affect the water diffusivity. The HCC method using the thermal power signals and Van’t Hoff's law were both employed to estimate the water sorption enthalpy. Sorption enthalpy of water in both polymers was determined to be approximately −40kJ/mol for all water activity levels. Zimm–Lundberg analysis showed that water clusters start to form at a water activity of 0.4. The engaged species induced clustering (ENSIC) model was used to curve fit sorption isotherms and showed that the affinity among water molecules is higher than that between water molecules and polymer chains. All the methods used indicate that clustering of water molecules exists in both polymers.

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Collaboration types
Domestic collaboration
Web of Science research areas
Engineering, Chemical
Polymer Science
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