Synergistic Effects of Polybenzimidazole and Aramide on Enhancing Flame‐Retardancy and Solubility

Abstract

Aromatic and functional polymers with processibility derived from biobased starting materials are prerequisite considering sustainable society. Poly(2,5-benzimidazole)s are rigid-rod polymers to show ultrahigh thermal stability such as flame retardance, while usually suffer from poor solubility. Here, poly(benzimidazole-co-amide)s are synthesized from two biobased monomers, 3,4-diaminobenzoic acid and a semirigid comonomer, 4-aminohydrocinnamic acid. The copolymers with an amide composition of 80 mol% and higher are soluble in widely used polar solvents to fabricate the films keeping high flame retardance, which is comparable with popular high-performance polymers such as aromatic polyimides, polyetheretherketone, polyphenylene sulfide, etc.

Sub-micro porous thin polymer membranes for discriminating H2 and CO2

“…A synergy between intrinsic pores offered by rigid chains and transient pores suggested by flexible chains elicits excellent molecular sieving behavior. However, reported typical polymers, like PIMs and TR polymers, exhibit low selectivity for H 2 /CO 2 separation because of their unsuitable pore size 28 – 30 .…”

Novel thermally insulated ultra‐lightweight fireproof and high impact resistance advanced hybrid composite

“…The ABPBI has ultra‐rigid backbone with extended conjugation and π–π stacking and H‐bonding. [ 13 ] The fiber has high chemical resistance and is a relatively nonflammable material and is brown‐black in color. ABPBI is used as a reinforcing fiber for this composite due to its very high limiting oxygen index (LOI), high deflection temperature (HDT).…”