Synthesis
and Properties of Bis(3,5-dimethyl-4-amino phenyl)-4′-methoxy
phenyl Methane Based Polymerization of Monomeric Reactants Type Polyimide
and Its Composites
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Abstract
Polymerization
of Monomeric Reactants (PMR) type of polyimide was prepared using
bis(3,5-dimethyl-4-amino phenyl)-4′-methoxy phenyl methane
and characterized by elemental analysis, FT-IR, <sup>1</sup>H NMR,
and <sup>13</sup>C NMR spectral techniques. Differential scanning
calorimetry (DSC) analysis shows that melting and curing take place
in the temperature range of 215 to 230 °C and 265 to 315 °C
respectively. The uncured and cured prepolymer undergo two step (335
and 583 °C) and single step (537 °C) decomposition respectively.
The <i>T</i><sub>10%</sub> and char yield at 800 °C
were found to be 465 °C and 46 wt %, respectively. FT-IR and
thermogravimetric analysis (TGA) of the heat treated resin powder
and prepolymer reveal that imidization takes place in the temperature
range 250–275 °C and cross-linking occurs between 275
and 325 °C. The prepolymer was found to undergo photocross-linking.
The flexural strength, flexural modulus, and interlaminar shear strength
of carbon fiber (T300) reinforced BA4MPM-PMR type composite are 447
MPa, 34 GPa, and 42 MPa, respectively
