Synthesis of Block Copolymers containing Chain‐Controlled Aramid and Fluoroethylene Segments

Abstract

Summary: Novel block copolymers containing aromatic polyamide (aramid) and fluoroethylene segments were synthesized by a two‐step solution polycondensation. This synthetic method could control the chain‐length of aramid segments and these copolymers could have high structural regularity. The number‐average molecular weight ($\overline M _{\rm n}$) of one of these polymers is over 2.0 × 104. Incorporating fluoroethylene segments improves the solubility of the resulting polymer compared with conventional aramids.The synthesis of the fluoroethylene‐aramid block copolymers.magnified imageThe synthesis of the fluoroethylene‐aramid block copolymers.

Preparation of High Strength and Toughness Aramid Fiber by Introducing Flexible Asymmetric Monomer to Construct Misplaced‐Nunchaku Structure

“…High‐performance polymer fibers have been widely used in composites, playing an important role in aerospace, military applications, and other fields. [ 1–6 ] The rapid development of these fields puts forward higher requirements for new fiber composites, which need both high strength and toughness. [ 7,8 ] As a representative of high‐performance fibers, poly (p‐phenylene terephthalamide) (PPTA) fiber has remarkable mechanical properties and thermal stability due to the rigid‐chain structure.…”