期刊
CHEMISTRY OF MATERIALS
卷 16, 期 9, 页码 1686-1692出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm035267m
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The morphology and thermal properties have been investigated in laponite/poly(ethylene oxide) (PEO) clay/homopolymer and laponite/poly(ethylene oxide-b-isoprene) (PEO-PI) clay/ block copolymer nanocomposites using small- and wide-angle X-ray scattering, optical microscopy, transmission electron microscopy, and differential scanning calorimetry. In the laponite/PEO composite, PEO intercalation adjusts the layer spacing and increases the layer correlation length. In the laponite/PEO-PI nanocomposite, the enthalpic interactions between the unlike blocks favoring nanophase separation work in tandem with the entropic interactions favoring polymer/clay intercalation, giving rise to multiple levels of organization. We show that (1) a diblock copolymer can be effectively intercalated within the clay galleries and (ii) the balance of these interactions give rise to a case where one block of the copolymer is intercalated and the other forms a spring that keeps the clay platelets apart, i.e., hairy plates.
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