Polyimides

A new indane containing unsymmetrical diamine monomer (3) was synthesized. This diamine monomer leads to a number of novel semifluorinated poly (ether imide)s when reacted with different commercially available dianhydrides like benzene‐1,2,4,5‐tetracarboxylic dianhydride (PMDA), benzophenone‐3,3′, 4,4′‐tetracarboxylic dianhydride (BTDA), 4,4′‐(hexafluoro‐isopropylidene)diphthalic anhydride (6FDA), 4,4′‐oxydiphthalic anhydride (ODPA), and 4,4′‐(4,4′‐Isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) by thermal imidization route. All the poly(ether imide)s showed excellent solubility in several organic solvents such as N‐methylpyrrolidone (NMP), N,N‐dimethylformamide (DMF), N,N‐dimethylacetamide (DMAc), tetrahydrofuran (THF), chloroform (CHCl3) and dichloromethane (DCM) at room temperature. These light yellow poly (ether imide)s showed very low water absorption (0.19–0.30%) and very good optical transparency. Wide angle X‐ray diffraction measurements revealed that these polymers were amorphous in nature. The polymers exhibited high thermal stability up to 526°C in nitrogen with 5% weight loss, and high glass transition temperature up to 265°C. The polymers exhibited high tensile strength up to 85 MPa, modulus up to 2.5 GPa and elongation at break up to 38%, depending on the exact polymer structure. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

Section: Resultsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of highly soluble poly(ether imide)s containing indane moieties in the main chain

Dasgupta

Sen

Maji

et al. 2009

“…Polyimides are an interesting class of polymers because of their number of outstanding properties, such as excellent thermal and thermooxidative stability, solvent resistance, and mechanical and electrical properties 1–8. These materials were considered for use in numerous applications, which require robust organic materials including composites and precursors for high‐performance aerospace materials as well as membranes for gas separation.…”

Section: Introductionmentioning

confidence: 99%

Polyimides 6: Synthesis, characterization, and comparison of properties of novel fluorinated poly(ether imides)

Banerjee

Madhra

Kute

2004

Five new poly(ether imides) have been prepared on reaction with oxydiphthalic anhydride (ODA) with five different diamines: 1,4‐bis(p‐aminophenoxy‐2′‐trifluoromethyl benzyl) benzene, 4,4′‐bis(p‐aminophenoxy‐2′‐trifluoromethyl benzyl) benzene, 1,3‐bis(p‐aminophenoxy‐2′‐trifluoromethyl benzyl) benzene, 2,6‐bis(p‐aminophenoxy‐2′‐trifluoromethyl benzyl) pyridine, and 2,5‐bis(p‐aminophenoxy‐2′‐trifluoromethyl benzyl) thiophene. Synthesized polymers showed good solubility in different organic solvents. The polyimide films have low water absorption of 0.3–0.7%, low dielectric constants of 2.82–3.19 at 1 MHz, and high optical transparency at 500 nm (>73%). These polyimides showed very high thermal stability with decomposition temperatures (5% weight loss) up to 531°C in air and good isothermal stability; only 0.4% weight loss occurred at 315°C after 5 h. Transparent thin films of these polyimides exhibited tensile strength up to 147 MPa, a modulus of elasticity up to 2.51 GPa and elongation at break up to 30% depending upon the repeating unit structure. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 821–832, 2004

“…27 However, the T g values of these polyimides are lower than Kapton films derived from PMDA-ODA (T g , 3908C). 27 As we expected, the T g values of these PIs depended on the structure of the dianhydride component, and decreased with increasing flexibility of the polyimides backbones based on applied the structure of dianhydride. PI obtained from ODPA showed a lower T g because of the presence of a flexible ether linkage between the phthalimide units.…”

Section: Thermal Properties Of the Resulting Polyimidesmentioning

confidence: 92%

Synthesis and characterization of novel polyimides derived from 2‐amino‐5‐(4‐aminophenyl)‐thiazole

Zhao

Shao

et al. 2007

A new kind of aromatic unsymmetrical diamine monomer containing thiazole ring, 2-amino-5-(4-aminophenyl)-thiazole (AAPT), was synthesized. A series of novel polyimides were prepared by polycondensation of AAPT with various aromatic dianhydrides by one-step polyimidation process. The synthesized polyimides had inherent viscosity values of 0.36-0.69 dL/g and were easily dissolved in highly dipolar solvents. Meanwhile, strong and flexible polyimide films were obtained, which have good thermal and thermo-oxidative stability with the glass transition temperatures (T g ) of 276.7-346.18C, the temperature at 5% weight loss of 451-4928C in nitrogen and 422-4408C in air, as well as have outstanding mechanical properties with the tensile strengths of 94-122 MPa, elongations at breakage of 5-18%. These films also had dielectric constants of 3.12-3.38 at 10 MHz.