NDLI: Solid heat-expandable polylactide-poly(methyl methacrylate) foam precursors prepared by immersion in liquid carbon dioxide

Content Provider	Springer Nature Link
Author	Yoon, Yonghoon Plummer, Christopher J. G. Månson, Jan Anders E.
Copyright Year	2015
Abstract	Solid heat-expandable foam precursors were prepared by impregnating melt-blended poly(d,l-lactide) (PDLLA)-poly(methyl methacrylate) (PMMA) blends with liquid carbon dioxide (CO$_{2}$). The phase behavior of these blends was strongly dependent on the processing steps, but impregnation with liquid CO$_{2}$ led to phase separation regardless of the prior thermomechanical history, and crystallization in blends containing a low-D grade of PDLLA suppressed subsequent expansion. On the other hand, blends containing nominally amorphous high-D PDLLA were found to be unstable with respect to expansion under ambient conditions when saturated with CO$_{2}$. It was therefore necessary to reduce the overall CO$_{2}$ content by allowing it to desorb partially at 10 °C immediately after impregnation. Under these conditions, the amorphous PDLLA-50 wt% PMMA precursors were stable at ambient temperature and pressure, and showed peak expansion ratios at significantly higher temperatures than pure PDLLA, thanks to the increase in effective glass transition temperature with increasing PMMA content. It was hence demonstrated that blending with PMMA may provide a convenient means of tailoring the process window for heat-expandable polylactide foams, as well as improved heat stability.
Starting Page	7208
Ending Page	7217
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	50
Issue Number	22
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2015-07-29
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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