Synthesis and properties of hyperbranched polyimides derived from novel triamine with prolonged chain segments

Abstract

Novel pyridine‐containing hyperbranched polyimides (HBPIs) were synthesized by using a new triamine 2,4,6‐tris[3‐(4‐aminophenoxy)phenyl]pyridine with prolonged chain segments, ether linkage and meta‐linked units as a BB′2‐like monomer, various commercial aromatic dianhydrides as A2 monomers. Most of the obtained HBPIs were readily soluble in common organic solvents such as N,N‐dimethylformamide, N,N‐dimethylacetamide, N‐methyl‐2‐pyrrolidone, m‐Cresol, and so forth. Meanwhile, they also had good thermal stability with the glass transition temperatures (Tgs) all above 210 °C, the temperature at 10% weight loss of 537.1–574.4 °C in nitrogen atmosphere. Strong and flexible HBPI films were obtained, which had good mechanical properties with tensile strengths of 83.3–95.8 MPa, tensile modulus of 1.82–2.43 GPa and elongations at break of 4.84–6.98%. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 2425–2437

Synthesis and characterization of hyperbranched poly(ether sulfone)imides and MWCNTs‐COOH/NH2 Nanocomposites

“…The PDI values were in the range of 1.31–1.62. The results obtained in this work are similar with the reported paper . The inherent viscosity of the synthesized HBPIs was determined using a Ubbelohde viscometer at a concentration of 0.5 g dL −1 in NMP at 30°C.…”

“…Bulky sulfonyl moiety inhibits the crystallization behavior of HBPIs and hence increases its solubility . The incorporation of sulfonyl linkages in the backbone of HBPIs decreases the intermolecular forces between the polymer chains to hinder the crystallization behavior of polyimides .…”

Aromatic Hyperbranched Polymers: Synthesis and Application

“…The amino-and anhydride-terminated hb-PIs showed T d,10% values of 568-583 C, indicating high thermal stability. The BTDA-and ODPA-based hb-PIs showed high T g values of 311-339 C. The [136,137,145] Dianhydrides as A2 monomers: ) and 4,4-(hexafluoroisopropylidene)diphthalic anhydride (6FDA, 1-24, Scheme 9b) as A 2 monomer to form fluorinated hb-PIs by the A 2 + B 3 approach. Here, 3,5-ditrifuoromethylphenyl was used as an end-capping reagent.…”

“…Shen et al [136] prepared several hb-PIs from a BB The addition of dianhydride into triamine TAPPP with a monomer molar ratio of 1:1 yielded the amine-terminated hb-PIs, whereas the reverse monomer addition order with a molar ratio of 2:1 gave the anhydride-terminated hb-PIs. The monomer was added slowly to avoid any high local concentration.…”

Synthesis and properties of (A2+B4)-type hyperbranched polyimides with different terminal groups

“…28 Thus, the branched monomer IV was intentionally designed to possess several flexible ether linkages to enhance the distance between the branching points, while the dianhydride was also designed to prolong the chain length. The mechanical properties of the PI films prepared by the thermal curing are listed in Table 5.…”