%0 Journal Article
%A Kennedy, Zachary C.
%A Christ, Josef F.
%A Arey, Bruce W.
%A Zhong, Lirong
%A Barrett, Christopher A.
%D 2019
%T Tunable Porosity in Fused Filament 3D-Printed Blends
of Intrinsically Porous Polymer and Thermoplastic Aliphatic Polyesters
Polycaprolactone and Polylactic Acid
%U https://acs.figshare.com/articles/journal_contribution/Tunable_Porosity_in_Fused_Filament_3D-Printed_Blends_of_Intrinsically_Porous_Polymer_and_Thermoplastic_Aliphatic_Polyesters_Polycaprolactone_and_Polylactic_Acid/7742828
%R 10.1021/acsapm.8b00172.s001
%2 https://acs.figshare.com/ndownloader/files/14405549
%K 3- chloro -1-propanol
%K Intrinsically Porous Polymer
%K surface areas
%K PCL
%K Fused Filament 3 D-Printed Blends
%K customizable 3 D objects
%K FFF 3 D printing
%K microporous polymer PIM
%K nanostructured phase separation
%K PLA
%K Thermoplastic Aliphatic Polyesters Polycaprolactone
%K filament
%K extrusion-based processing methodology
%K micropore
%X Future
advances and usage of all-organic polymeric materials with
permanent void spaces and high surface areas, in applications such
as separations or as supports, depends heavily on the development
of processing techniques to produce complex geometry objects. Here,
the high free volume glassy microporous polymer PIM-1 was fabricated,
as a major component in a polymer blend, into complex and customizable
3D objects by fused filament fabrication (FFF). PIM-1 was found to
be compatible with polycaprolactone (PCL) and polylactic acid (PLA)
and thus could be processed by extrusion into filaments with high
loadings of PIM-1 (50% by mass). Ternary PCL/PLA/PIM-1 composite filaments
provided an optimal balance of durability and melt flow characteristics
for consistent FFF 3D printing of intricate structures. As printed,
the micropores of PIM-1 were blocked and inaccessible to N2 during sorption experiments; however, the ternary composite structures
displayed significant meso- and macroporosity and nanostructured phase
separation. Postprinting immersion in 3-chloro-1-propanol was identified
to selectively remove PCL within the composites, re-expose the characteristic
micropores of PIM-1, and retain the macrostructure of the printed
object. After postprinting treatments, specific surface areas by the
Brunauer–Emmett–Teller method (as high as 460 m2 g–1) were found to directly correlate with
the PCL content originally present. The extrusion-based processing
methodology provides a new approach for production of intrinsically
porous polymer objects in custom and complex shapes by reinforcement
with thermoplastics (PCL and PLA).
%I ACS Publications