Fluxible poly(p-phenyleneterephthalamide)-based polymer with tunable condensed state structure and controllable rheology behaviors

- The novel material improved non-flow property of rigid-rod polymer.
- Different condensed state structures and rheology behaviors were achieved.
- Varied liquid crystal states were observed in different conditions.
- This material shows great potential for use in flexible membrane capacitors.

The non-flow property for rigid-rod polymers remains a serious problem that limits their application on a massive scale. Based on a water-in-oil microemulsion method and one pot in situ “grafting to” strategy, a series of novel poly(p-phenylene terephthalamide)-based materials containing controllable graft density of long-chain tertiary amine are prepared. Consequently, the materials' rheology behaviors are controllable at the level of an order of magnitude and are well-matched with the tunable condensed state structures. Several significant micro-structures of such liquid-like poly(p-phenylene terephthalamide)-based materials are obtained. Additionally, the excellent solubility conforms to the liquid crystal states, solving the key problem of only dissolving concentrated sulfur acid. Additionally, we further investigated the liquid crystal states in different solvents, mass ratios and temperature. This state-of-the-art material with its established property-structure relationship, especially regarding how the structure determines the rheology behavior and solubility, can be treated as a prototype for guiding future research on ionic liquids and in the field related to functional polymer science and technology. Furthermore, the dielectric properties of f-PPTA/PVDF composite membranes have been investigated and show great potential for use in capacitor applications.

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