Poly(ethylene terephthalate) reinforced by N,N′‐diphenyl biphenyl‐3,3′,4,4′‐tetracarboxydiimide moieties

Abstract

Starting with 3,3′,4,4′‐biphenyltetracarboxylic dianhydride and methyl aminobenzoate, we synthesized a novel rodlike imide‐containing monomer, N,N′‐bis[p‐(methoxy carbonyl) phenyl]‐biphenyl‐3,3′,4,4′‐tetracarboxydiimide (BMBI). The polycondensation of BMBI with dimethyl terephthalate and ethylene glycol yielded a series of copoly(ester imide)s based on the BMBI‐modified poly(ethylene terephthalate) (PET) backbone. Compared with PET, these BMBI‐modified polyesters had higher glass‐transition temperatures and higher stiffness and strength. In particular, the poly(ethylene terephthalate imide) PETI‐5, which contained 5 mol % of the imide moieties, had a glass‐transition temperature of 89.9 °C (11 °C higher than the glass‐transition temperature of PET), a tensile modulus of 869.4 MPa (20.2 % higher than that of PET), and a tensile strength of 80.8 MPa (38.8 % higher than that of PET). Therefore, a significant reinforcing effect was observed in these imide‐modified polyesters, and a new approach to higher property polyesters was suggested. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 852–863, 2002; DOI 10.1002/pola.10169

Synthesis and characterizations of branched poly(butylene succinate) copolymers with 1,2‐octanediol segments

“…From Figure 2(b), it can be seen that the crystallization temperatures of branched PBS copolymers are all lower than that of neat PBS, and decrease gradually with the increasing of 1,2‐OD segments content, indicating that the introduction of 1,2‐OD segments hindered the crystallizability of PBS. The supercooling degree (Δ T = T m − T c ) is an important parameter for determining the crystallizability of polymers 27. Generally speaking, the larger Δ T value, the lower the crystallizability.…”

Enhanced solubility of novel poly(benzoxazole)s with a soft linkage and a rigid pendant group

“…Polymers containing 3,3′‐diamino‐4,4′‐dihydroxydiphenylsulfone exhibited enhanced solubility compared with polymers containing 2,2‐bis(3‐amino‐4‐hydroxyphenyl) hexafluoropropane because of the insolubility of the former polymer in dimethyl sulfoxide (DMSO), N , N ‐dimethylformamide (DMF), N ‐methyl‐2‐pyrrolidone (NMP) and N , N ‐dimethylacetamide (DMAc) Rigid groups are incorporated to distort the regularity of the main chain , . The rigidities of these groups should not be significantly different from those of heterocyclic polymers.…”

“…Rigid groups are incorporated to distort the regularity of the main chain , . The rigidities of these groups should not be significantly different from those of heterocyclic polymers.…”

“…Trifluoromethyl groups have also been used as typical solubility-improving substituents for poly(benzoxazole)s. 14 -20 (2) Rigid groups are incorporated to distort the regularity of the main chain. 23,24 The rigidities of these groups should not be significantly different from those of heterocyclic polymers. This method could improve the solubility and maintain the thermal stability of polymers.…”

Synthesis, Characterization and Properties of Poly(butylene succinate) Reinforced by Trimellitic Imide Units

“…Polyimides are one of the most important commercial polymers because of their good thermal properties and mechanical properties 17,18. To our knowledge, the combination of polyesters and polyimides has achieved great success and yielded a series of new materials with high performance 19–23. Xiao et al19 modified poly(ethylene terephthalate) (PET) by the incorporation of imide structures.…”