Aromatic furanic polyamides with relatively high molecular weight were synthesized, and good thermal stability and mechanical properties were demonstrated.
The rapid development
in electronics requires high-performance
and low-k materials. Introducing additional recyclability
to these materials could further promote their application from environmental
and economic aspects. In this paper, we report a reversibly cross-linked
composite from a newly designed maleimide functionalized POSS (mPOSS)
and aromatic polyamide with pendent furan groups (POF). The Diels–Alder
reaction between maleimide and furan groups allowed the facile cross-linking
of POF by mPOSS, thus significantly improving the thermal and mechanical
properties of mPOSS/POF composites. The reversible feature of Diels–Alder
reaction also conferred good recyclability to the mPOSS/POF composites.
Tensile tests suggested that more than 80% of mechanical properties
were retained in reprocessed composites even with multiple reprocessing
cycles. Moreover, the porous nature of POSS molecules and the restricted
motion of polymer chains by cross-linking significantly reduced the
dielectric constant and dielectric loss of composites. These fascinating
features of our mPOSS/POF composites make them promising candidate
for high-performance, recyclable, and low-k dielectrics.
Solution blow spinning (SBS) is a novel scalable process to fabricate nanofibrous mat with high efficiency and security. Herein, as a proof of concept, we adopt SBS methodology to prepare a kind of free-standing polyimide nonwoven membrane with adhesion morphology among an interconnected network and employ it as a potential lithiumion battery separator successfully. Results manifest that asprepared polyimide membrane possesses satisfactory porosity (87.3%), excellent thermal stability (no shrinkage even up to 180 °C), and admirable electrolyte wettability, which further significantly improves the ionic conductivity (1.74 mS cm −1 ). In addition, cells assembled with polyimide membranes deliver outstanding cycling performance and C-rate discharge capability compared with Celgard 2400 in the same conditions. Overall, this study reveals that SBS as a facile spinning-strategy might be easily converted into continuous production on an industrial scale and, along with the aforementioned charming features, indicates that as-fabricated polyimide separators possess availability, catering for the utilization in large-scale lithiumion batteries.
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