In this study, hyperbranched polyimides were prepared from 2,6-bis(4-aminophenyl)-4-(4-(4-aminophenoxy)phenyl)pyridine (BAAP) and commercial dianhydrides by strictly controlling the reaction conditions. Polyimides with phthalimide pendants were also prepared to study the influence mechanisms of terminating BAAP by phthalic anhydride (PA) on polyimides’ properties. Fourier transform infrared and proton nuclear magnetic resonance spectroscopies were utilized to observe the chemical structures of the hyperbranched polyimides. The influence of terminating BAAP by PA on polyimides’ properties was studied by comparing the two series of polyimides. All the polyimide samples held completely amorphous structures and possessed excellent solubility and thermal stability. Terminating BAAP by PA decreased the d-spacing values of the obtained polyimides and slightly weakened their solubility and thermal stability.
ChenWYanWWuS. Preparation and properties of novel triphenylpyridine-containing hyperbranched polyimides derived from 2,4,6-tris (4-aminophenyl)pyridine under microwave irradiation. Macromol Chem Phys2010; 211: 1803–1813.
3.
ChenYCLoWCJuangTY. Thermally stable hyperbranched nonlinear optical polyimides using an “A2+B3” approach. Mater Chem Phys2011; 127: 107–113.
4.
LinRHWangWMChenYH. Preparation and characterization of biodegradable condensation polyimide. Polym Degrad Stabil2012; 97: 1534–1544.
5.
VerkerRAtarNQueroF. Tensile stress effect on the macromolecular orientation and erosion mechanism of an atomic oxygen irradiated polyimide. Polym Degrad Stabil2013; 98: 997–1005.
6.
LiuHLiYWangT. In situ synthesis and thermal, tribological properties of thermosetting polyimide/graphene oxide nanocomposites. J Mater Sci2012; 47: 1867–1874.
7.
NaitoK. The effect of high-temperature vapor deposition polymerization of polyimide coating on tensile properties of polyacrylonitrile-and pitch-based carbon fibers. J Mater Sci2013; 48: 6056–6064.
8.
SeyedjamaliHPirisedighA. Synthesis and morphology of new functional polyimide/titania nano hybrid materials. J Mater Sci2011; 46: 6744–6750.
9.
ZhuoLKouKWangY. Synthesis and characterization of pyrimidine-containing hyperbranched polyimides. Des Monomers Polym2015; 18: 42–50.
10.
KimSDKimSYChungIS. Soluble and transparent polyimides from unsymmetrical diamine containing two trifluoromethyl groups. J Polym Sci Polym Chem2013; 51: 4413–4422.
11.
HasegawaMHiranoDFujiiM. Solution-processable colorless polyimides derived from hydrogenated pyromellitic dianhydride with controlled steric structure. J Polym Sci Polym Chem2013; 51: 575–592.
12.
WangDHRileyJKFillerySP. Synthesis and characterization of unsymmetrical benzonitrile-containing polyimides: viscosity-lowering effect and dielectric properties. J Polym Sci Polym Chem2013; 51: 4998–5011.
13.
ShenJZhangYChenW. Synthesis and properties of hyperbranched polyimides derived from novel triamine with prolonged chain segments. J Polym Sci Polym Chem2013; 51: 2425–2437.
14.
GhoshASenSKBanerjeeS. Solubility improvements in aromatic polyimides by macromolecular engineering. RSC Adv2012; 2: 5900–5926.
15.
WangCZhaoXLiG. New soluble polyimides with high optical transparency and light color containing pendant trifluoromethyl and methyl groups. Chin J Chem2012; 30: 1555–1560.
16.
ZengKGuoQGaoS. Studies on organosoluble polyimides based on a series of new asymmetric and symmetric dianhydrides: Structure/solubility and thermal property relationships. Macromol Res2012; 20: 10–20.
17.
ImaizumiSOhtsukiYYasudaT. Printable polymer actuators from ionic liquid, soluble polyimide, and ubiquitous carbon materials. ACS Appl Mater Inter2013; 5: 6307–6315.
18.
EguchiYUnsalECakmakM. Critical phenomenon during drying of semiaromatic, transparent and soluble polyimide cast films: real-time observation of birefringence and other integrated parameters. Macromolecules2013; 46: 7488–7501.
19.
KimJWYiMHAhnT. Surface energy control of soluble polyimide gate insulators by copolymerization method for high performance pentacene thin-film transistors. Thin Solid Films2013; 546: 147–152.
20.
ZhuoLKouKWangY. Synthesis of soluble and thermally stable polyimides with phthalimide as pendent group from pyridine-containing triamine. J Mater Sci2014; 49: 5141–5150.
21.
HawkerCLeeRFréchetJ. One-step synthesis of hyperbranched dendritic polyesters. J Am Chem Soc1991; 113: 4583–4588.
22.
CalleMLeeYM. Thermally rearranged (TR) poly(ether-benzoxazole) membranes for gas separation. Macromolecules2011; 44: 1156–1165.
23.
MaXSwaidanRTengB. Carbon molecular sieve gas separation membranes based on an intrinsically microporous polyimide precursor. Carbon2013; 62: 88–96.
24.
SteelKMKorosWJ. Investigation of porosity of carbon materials and related effects on gas separation properties. Carbon2003; 41: 253–266.
25.
RoeRJRoeR. Methods of X-ray and neutron scattering in polymer science. New York: Oxford University Press, 2000.
