New transparent and thermally stable cardo poly(ether imide)s derived from 10,10-bis[4-(4-amino-2-pyridinoxy)phenyl]-9(10H)-anthrone

Abstract

A new diamine bearing flexible ether, rigid pyridine, and bulky anthrone pendent group, 10,10-bis[4-(4-amino-2-pyridinoxy)phenyl]-9(10 H)-anthrone (BAPPA), was prepared in three steps from anthrone. BAPPA was reacted with six conventional aromatic dianhydrides in N, N-dimethylacetamide (DMAc) to form the corresponding new poly(ether imide)s (PEIs) via the poly(ether amic acid) (PEAA) precursors with inherent viscosities ranging from 0.85 dL g−1 to 1.26 dL g−1 and thermal imidization. All the PEAAs could be cast from DMAc solution and thermally converted into transparent, flexible, and tough PEI films with tensile strength of 72.2–112.4 MPa, tensile modulus of 1.8–2.1 GPa, and elongation at break of 10–18%. These PEIs were predominantly amorphous and displayed excellent thermal stability with the glass transition temperature of 290–388°C, the 5% weight loss temperature of 480–514°C, and the residue of 68–43% at 800°C in nitrogen. The PEIs derived from 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride and 4,4′-hexafluoroisopropylidenediphathalic anhydride exhibited excellent solubility in organic solvents such as N-methyl-2-pyrrolidinone, DMAc, N, N-dimethylformamide, pyridine, and even in tetrahydrofuran. Meanwhile, these PEIs also exhibited high optical transparency with the ultraviolet cutoff wavelength in the 374–427 nm range and the wavelength of 80% transparency in the range of 468–493 nm.

New nanocomposite membranes based on polybenzimidazole with improved fuel cell performance at high temperatures

“…To overcome these limitations (leaching and dehydration of PA at high temperatures), several approaches have been investigated by different research groups [48]. One of the best strategies is preparation of nanocomposite membranes with improved hydrogen bonding interactions to expand the dimensional, chemical, mechanical, and thermal stability [49,50]. Advanced PEMs with improved conductivity have been reported based on inorganic additives and nanoparticles [51,52].…”

New fluorinated polyimides based on 1,2-bis(4-aminophenyl)-4,5-bis(4-trifluoromethylphenyl)-1H-imidazole

“…5,6 To overcome these limitations, many efforts have been devoted to the structural modification studies on the PIs to meet the easy processing, and improve their thermal and photoelectric properties. Some feasible approaches such as the insertion of flexible linkages [7][8][9][10] and alicyclic groups [11][12][13][14] into the polymer backbone have been used to prepare soluble and transparent PIs. But the flexible and alicyclic moieties usually cause somewhat deterioration of the inherent thermal stability.…”

New blend nanocomposite membranes based onPBI/sulfonated poly(ether keto imide sulfone) and functionalized quantum dot with improved fuel cell performance at high temperatures

“…[43][44][45][46] Even it also has been confirmed that the introduction of rigid heteroaromatic rings (such as thiazole and pyridine) to the polymer structure in addition to improving proton transfer could donate it with excellent thermal and thermo-oxidative stability. 1,47,48 Novel nanocomposite blend membranes were developed based on PBI, SPEKIS, and ZnS functionalized quantum dots (FQDs). The ZnS FQDs having both COOH and NH 2 groups were used as a novel nano inorganic filler in the PBI membrane.…”

“…Characteristic of being a polyimide, which is a well‐known high‐performance polymer, helps the SPEKIS exhibit an exceptional combination of thermal stability, mechanical toughness, and chemical resistance 43‐46 . Even it also has been confirmed that the introduction of rigid heteroaromatic rings (such as thiazole and pyridine) to the polymer structure in addition to improving proton transfer could donate it with excellent thermal and thermo‐oxidative stability 1,47,48 . Novel nanocomposite blend membranes were developed based on PBI, SPEKIS, and ZnS functionalized quantum dots (FQDs).…”