Versatile Fabrication of Carbon Nanotube Yarn Composites by In-Situ Interfacial Polymerization of Polyetherimide
Durso, Michael N
;
Sawyer, William J
;
Hart, A John
Compos. Part B: Eng.,2024,111770.
DOI:
10.1016/j.compositesb.2024.111770
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Abstract: Manufacturing of high-performance carbon nanotube (CNT)-based polymer composites has long been complicated by the difficulty of infiltrating the nanoporous network presented by continuous CNT materials; this can yield composites with heterogeneities that drastically worsen their mechanical properties. We show the synthesis of CNT-polyetherimide (PEI) composite yarns via in-situ interfacial polymerization (ISIP), which side-steps slow, viscous polymer transport by infiltrating and reacting monomer species in-situ via a rapid and scalable process. By nucleating polymer coatings at the nanoscale, ISIP offers a potential scalable route to producing enhanced yarn for assembly into bulk composites. We demonstrate the ISIP technique on two distinct, industrially-produced CNT yarns, and identify processing parameters that achieve conformal polymer coatings, yielding statistically-significant increases to linear density-specific tensile properties. Using ISIP on pre-densified yarns results in composites with specific stiffness and tenacity of 142 N/tex and 2.2 N/tex, respectively. When ISIP is applied to lightly-processed, porous CNT yarn, the specific stiffness and tenacity reach up to 65.6 N/tex and 0.65 N/tex. The role of interfacial effects, particularly from amorphous carbon, on the composite properties is also explored. Finally, we demonstrate a prototype roll-to- roll ISIP apparatus which can process arbitrary lengths of yarn for continuous composite production.
Purchased from AmBeed:
38103-06-9
Scalable, Versatile Synthesis of Ultrathin Polyetherimide Films and Coatings via Interfacial Polymerization
Chazot, Cecile A. C.
;
Thrasher, Carl J.
;
Peraire-Bueno, Alexander
, et al.
Adv. Funct. Mater.,2023,33(24):2214566.
DOI:
10.1002/adfm.202214566
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Abstract: Polyetherimides (PEI) are high-performance thermoplastic polymers featuring a high dielec. constant and excellent thermal stability. In particular, PEI thin films are of increasing interest for use in solid-state capacitors and membranes, yet the cost and thickness are limited by conventional synthesis and thermal drawing techniques. Here, a method of synthesizing ultrathin PEI films and coatings is introduced based on interfacial polymerization (IP) of poly(amic acid), followed by thermal imidization. Control of transport, reaction, and precipitation kinetics enables tailoring of PEI film morphol. from a nanometer-scale smooth film to a porous micrometer-scale layer of polymer microparticles. At short reaction times (≈1 min) freestanding films are formed with ≈1μm thickness, which to our knowledge surpass com. state-of-the-art films (3-5μm min. thickness) made by thermal drawing. PEI films synthesized via the IP route have thermal and optical properties on par with conventional PEI. The use of the final PEI is demonstrated in structurally colored films, dielec. layers in capacitors, and show that the IP route can form nanometer-scale coatings on carbon nanotubes. The rapid film formation rate and fine property control are attractive for scale-up, and established methods for roll-to-roll processing can be applied in future work.
Purchased from AmBeed:
38103-06-9
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