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Microstructure of Ion-Selective Plasticized PVC Membranes Studied by Small-Angle Neutron Scattering.

Q Ye¹, S Borbély, G Horvai

¹Division of Chemical Information Technology, Technical University of Budapest, H-1111 Budapest, Gellért tér 4, Hungary, and Research Institute for Solid State Physics and Optics, H-1121 Budapest, Konkoly Thege u. 29-33, Hungary.

Analytical Chemistry

|June 14, 2011

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Small-angle neutron scattering revealed distinct inhomogeneities in plasticized PVC membranes. These structures, composed of unplasticized PVC, influence water uptake but remain unchanged by hydration.

Area of Science:

Materials Science
Polymer Science
Physical Chemistry

Background:

Plasticized polyvinyl chloride (PVC) membranes are widely used in various applications.
Understanding their microstructure is crucial for optimizing performance, especially concerning water interactions.
Previous studies have not fully elucidated the nanoscale structure of these membranes in relation to their plasticization and hydration behavior.

Purpose of the Study:

To investigate the microstructure of plasticized PVC membranes in both dry and hydrated states.
To determine the nature and size of inhomogeneities within the membrane matrix.
To correlate membrane composition and plasticizer content with water uptake characteristics.

Main Methods:

Small-angle neutron scattering (SANS) was employed to probe the membrane microstructure.

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The dry membrane structure was analyzed using a polydisperse hard-sphere model.

Heavy water was used to study the membrane's response to hydration.

Main Results:

Inhomogeneities, approximately 6 nm in diameter, were identified in the dry PVC membranes.
These inhomogeneities are likely composed of crystalline, unplasticized PVC, smaller than a single polymer chain.
Membrane composition, plasticizer type, content, and lipophilic salt addition significantly affected water uptake.
Hydration did not alter the inherent microstructure of the dry membrane.

Conclusions:

The microstructure of plasticized PVC membranes consists of unplasticized PVC inhomogeneities.
These structural features play a role in water absorption but are stable during hydration.
SANS is an effective technique for characterizing the nanoscale structure of polymer membranes and their interaction with solvents.