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Fabrication and characterization of novel hyperbranched polyimides with excellent organosolubility, thermal and mechanical properties.
Fabrication and characterization of novel hyperbranched polyimides with excellent organosolubility, thermal and mechanical properties.
- Source :
- Journal of Applied Polymer Science; Mar2015, Vol. 132 Issue 9, pn/a-N.PAG, 13p
- Publication Year :
- 2015
-
Abstract
- ABSTRACT A series of amine-terminated and anhydride-terminated hyperbranched polyimides (HBPIs) were successfully prepared with various commercial dianhydrides and a novel BB′<subscript>2</subscript>-type aromatic triamine, 2,4,6-tris[4-(4-aminophenoxy)phenyl]pyridine, with a symmetrical triaryl-substituted pyridine segment and prolonged flexible linkages. The chemical structure of the triamine monomer and the hyperbranched structure of the resulting polymers were verified by Fourier transform infrared spectroscopy and <superscript>1</superscript>H-NMR spectroscopy. The resulting HBPIs, which mainly held an amorphous morphology, exhibited improved organosolubilities in several strong polar aprotic solvents, good heat resistance with glass-transition temperature values in the range 218.6-311.0°C, and excellent thermal stabilities in both N<subscript>2</subscript> and air [the temperature at 5% weight loss ( T<subscript>5%</subscript>) in N<subscript>2</subscript> was higher than 529.8°C and the T<subscript>5%</subscript> in air was higher than 465.1°C]. The obtained HBPI films also showed outstanding mechanical properties with tensile strength, tensile modulus, and elongation at break values of 86.4-101.3 MPa, 1.73-2.04 GPa, and 5.07-10.67%, respectively; considerable optical transparency; low water absorption; and neutral interface wettability. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41544. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218995
- Volume :
- 132
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Applied Polymer Science
- Publication Type :
- Academic Journal
- Accession number :
- 99760190
- Full Text :
- https://doi.org/10.1002/app.41544