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Title: Water transport and clustering behavior in homopolymer and graft copolymer polylactide

Abstract

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 (95 wt.%) grafted onto a hydrophobic rubbery backbone (5 wt.%). 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 -40 kJ/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.

Authors:
; ; ; ;  [1]
  1. Drexel
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - OTHERNSF
OSTI Identifier:
1049559
Resource Type:
Journal Article
Journal Name:
J. Membrane Sci.
Additional Journal Information:
Journal Volume: 396; Journal Issue: 04, 2012; Journal ID: ISSN 0376-7388
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ACTIVITY LEVELS; AFFINITY; CALORIMETRY; CHAINS; COPOLYMERS; ENTHALPY; ISOTHERMS; POLYMERS; QUARTZ; SORPTION; TRANSPORT; WATER

Citation Formats

Du, An, Koo, Donghun, Theryo, Grayce, Hillmyer, Marc A., Cairncross, Richard A., and UMM). Water transport and clustering behavior in homopolymer and graft copolymer polylactide. United States: N. p., 2015. Web. doi:10.1016/j.memsci.2011.12.030.
Du, An, Koo, Donghun, Theryo, Grayce, Hillmyer, Marc A., Cairncross, Richard A., & UMM). Water transport and clustering behavior in homopolymer and graft copolymer polylactide. United States. doi:10.1016/j.memsci.2011.12.030.
Du, An, Koo, Donghun, Theryo, Grayce, Hillmyer, Marc A., Cairncross, Richard A., and UMM). Thu . "Water transport and clustering behavior in homopolymer and graft copolymer polylactide". United States. doi:10.1016/j.memsci.2011.12.030.
@article{osti_1049559,
title = {Water transport and clustering behavior in homopolymer and graft copolymer polylactide},
author = {Du, An and Koo, Donghun and Theryo, Grayce and Hillmyer, Marc A. and Cairncross, Richard A. and UMM)},
abstractNote = {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 (95 wt.%) grafted onto a hydrophobic rubbery backbone (5 wt.%). 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 -40 kJ/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.},
doi = {10.1016/j.memsci.2011.12.030},
journal = {J. Membrane Sci.},
issn = {0376-7388},
number = 04, 2012,
volume = 396,
place = {United States},
year = {2015},
month = {2}
}