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Microporous structure in silicone polymers with polylactic acid and polyethylene glycol microspheres: Synthesis and characterization

Journal Article · · MRS Advances
 [1];  [2];  [2];  [1]
  1. North Carolina A & T State Univ., Greensboro, NC (United States)
  2. Kansas City National Security Campus (KCNSC), Kansas City, MO (United States)
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Porosity in polymer parts could improve mechanical properties while reducing weight and density. Individual pores must be small enough that bulk mechanical properties are retained but significant enough to reduce the density of the material. Filler materials can be incorporated into polymer matrices and removed to create voids. Here, this paper focuses on creating spherical pores in silicone matrices by inserting and removing core materials or fillers during post-cure. A method was developed to incorporate pore formers into an uncured polymer resin and remove the pore former materials from the matrix. Polyethylene glycol (PEG) and polylactic acid (PLA) microspheres were created and incorporated into silicone matrices as pore formers. Microspheres with controllable size distributions were formed via an emulsion formation. Microspheres are removed from the matrix by solvent extraction and calcination. Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), and optical imaging characterize and determine the successful creation of micropores in the polymer matrices.
Research Organization:
Kansas City Nuclear Security Campus (KCNSC), Kansas City, MO (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002839
OSTI ID:
2473193
Report Number(s):
NSC--614-5483
Journal Information:
MRS Advances, Journal Name: MRS Advances Journal Issue: 10 Vol. 9; ISSN 2059-8521
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

References (8)

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Engineering porosity in polymer-derived ceramics journal January 2008
Porous wollastonite–hydroxyapatite bioceramics from a preceramic polymer and micro- or nano-sized fillers journal February 2012
Characterization of irregular open-cell cellular structure with silicone pore filler journal December 2013
3D printing of sacrificial templates into hierarchical porous materials journal January 2019
A simple solvent selection method for accelerated solvent extraction of additives from polymers journal January 1999
Synthesis and characterization of polylactic acid microspheres via emulsion-based processing journal August 2023

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Related Subjects

36 MATERIALS SCIENCE
DMA
PEG
PLA
TGA
emulsion
matrix
microspheres
planetary mixing
silicone
solvent extraction