Characterization of rigid polypropylene-based microcellular foams produced by batch foaming processes
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Document typeArticle
Defense date2011
Rights accessRestricted access - publisher's policy
Abstract
The properties of polypropylene (PP) foams can be
extended by controlling the cellular structure and adding
functional fillers. PP-based microcellular foams
having an interesting combination of mechanical and
transport properties were prepared by two different
batch foaming processes. The batch processes
employed were a semisolid state CO2 dissolution physical
foaming process and a chemical one based on the
dissolution of the gases generated by the thermal
decomposition of a chemical blowing agent in the molten
state. The role of the cellular structure and nanofillers
(5 wt% of organoclay and 10–20 wt% of cellulosic
fibers) on the foam properties and CO2 diffusion rate
was discussed. Foams with expansion ratios around 3
but different cell structures were prepared and studied
concerning their structural characteristics. For unfilled
foams prepared by CO2 dissolution, the microcellular
structure resulted in the highest values of the specific
storage modulus. A fraction of organically-treated
montmorillonite dispersed into the PP matrix resulted
in superior mechanical properties due to the combined
effect of a finer cell structure and inherent higher stiffness
of the silicate layers. Despite displaying an opencell
structure, foams reinforced with high contents of
cellulosic fibers showed increased specific storage
moduli with respect to the unfilled foams
CitationVelasco J.I. [et al.]. Characterization of rigid polypropylene-based microcellular foams produced by batch foaming processes. "Polymer engineering and science", 2011, vol. 51, núm. 11, p. 2120-2128.
ISSN0032-3888
Publisher versionhttp://onlinelibrary.wiley.com/doi/10.1002/pen.22048/pdf
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