NDLI: Geometrical Confining Effects in Compression Molding of Co-continuous Polymer Blends

Content Provider	Springer Nature Link
Author	Zhang, Wei Deodhar, Sarang Yao, Donggang
Copyright Year	2010
Abstract	Polymer blending is a versatile method for production of co-continuous porous materials. While numerous studies have been performed to elucidate the thermal annealing effects on the bulk structure, the effect of geometrical confinement is little understood. In the present work, possible effects from geometrical confinement during in-mold annealing were explored. A 50/50 wt.% poly (lactic acid)/polystyrene (PLA/PS) blend was compression molded and annealed between two parallel plates without being confined circumferentially during the compression molding process. Different conditions for geometrical confinement, including varied gap size and compression ratio (initial to final thickness ratio), as well as modified surface properties, were employed. The experimental results indicated that the gap size played a profound role in affecting the structural development; the phase size near the mold surface was smaller than away from the surface. The actual phase structure and the resulting gradient in pore size were further affected by the mold surface properties. Additionally, the compression ratio was found to affect the morphological development especially near the mold surface. At a high compression ratio, a thin layer of PLA was formed immediately during compression. The thickness of this layer either grew or reduced in size depending on the mold surface properties. Understanding of these geometrical confining effects and implementing them in processing may lead to the development of innovative porous materials.
Starting Page	1954
Ending Page	1964
Page Count	11
File Format	PDF
ISSN	00906964
Journal	Annals of Biomedical Engineering
Volume Number	38
Issue Number	6
e-ISSN	15739686
Language	English
Publisher	Springer US
Publisher Date	2010-04-02
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Scaffolds Polymer blends Interfacial tension Porous materials Compression molding Biochemistry Mechanics Biophysics and Biological Physics Biomedical Engineering Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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