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Controllable growth of gradient porous structures
Journal article   Peer reviewed

Controllable growth of gradient porous structures

Donggang Yao, Wei Zhang and Jack G Zhou
Biomacromolecules, v 10(5), pp 1282-1286
11 May 2009
DOI: https://doi.org/10.1021/bm900008d
PMID: 19354280
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Particle Size Temperature Lactic Acid - chemistry Surface Properties Polyesters Polymers - chemistry Porosity Polystyrenes - chemistry
Cocontinuous phase structures of immiscible polymers can be developed under appropriate melt-blending conditions. Because of the presence of interfacial tension, such cocontinuous structures start to coarsen when heated to a temperature higher than the melting/softening temperature of both phases. In this study, a method for controllable growth of gradient porous structures utilizing variable coarsening rates in a gradient temperature field was investigated. The phase structure coarsens at a higher rate in higher temperature regions but at a slower rate in lower temperature regions, resulting in the generation of a gradient phase morphology. Subsequent dissolution of one phase in the binary blend yields a gradient porous structure made of the remaining polymer component. A polystyrene/poly(lactic acid) (PLA) blend was used as a model system. By designing proper thermal boundary conditions and introducing different thermal gradients during annealing, different types of gradient porous structures of PLA were created.

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61 citations in Web of Science
67 citations in Scopus

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Collaboration types
Domestic collaboration
Web of Science research areas
Biochemistry & Molecular Biology
Chemistry, Organic
Polymer Science
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