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Thermal and Mechanical Properties of Phenylethynyl-Containing Imide Oligomers Based on Isomeric Biphenyltetracarboxylic Dianhydrides

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China

^* To whom correspondence should be addressed.

	Abstract

In order to further improve both processability of imide oligomers containing pendent or/and terminal phenylethynyl groups and their cured T_g values without sacrificing mechanical properties, isomeric dianhydrides, 2,2',3,3'-biphenyltetracarboxylic dianhydride (3,3'-BPDA) or 2,3',3,4'-biphenyl tetracarboxylic dianhydride (3,4'-BPDA), were introduced into main chain. The rigid and bent structure of the isomeric BPDAs can provide a good combination of melt flow while maintaining a high T_g. Phenylethynyl containing oligoimides were prepared from the reaction of isomeric dianhydrides (3,3'-BPDA, 3,4'-BPDA and 4,4'-BPDA), 4,4'-oxydianiline (4,4'-ODA), 3,5-diamino-4'-phenylethynyl benzophenone (DPEB) and 4-phenylethynylphthalic anhydride (4-PEPA) or phthalic anhydride (PA) at an approximate number average molecular weight of 2500 and 5000 g mol^–1. The imide oligomers from 3,3'-BPDA and 3,4'-BPDA exhibited good processability. The 3,3'-BPDA-based imide oligomers exhibited slightly lower melt viscosity and the cured resins exhibited similar T_g values compared with those from 3,4'-BPDA. OI-7 and OI-8 each with a molecular weight of 2500 g mol^–1 had lower melt viscosities of 25 Pa s (342 °C) and 178 Pa s (344 °C) and higher cured T_g at 367 °C and 365 °C. The cured films from OI-7, OI-8 showed good tensile properties and the elongations at break were around 10%. The neat resins from OI-7 and OI-8 had higher compressive strengths of 200 and 190 MPa. G827/OI-7 and G827/OI-8 exhibited comparable mechanical properities: flexural strengths of 1714 and 1826 MPa, flexural modulus of 130 and 124 GPa, and interlayer shear strengths of 95 and 101 MPa, respectively.

Key Words: Isomeric imide oligomers; biphenyltetracarboxylic dianhydride; phenylethynyl group

First published on January 21, 2009
High Performance Polymers 2009, doi:10.1177/0954008308101133


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