Copolymerizing behavior and processability of allyl‐functional bisphthalonitrile/bismaleimide system

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Abstract
A prepolymer constituted with bisphthalonitrile containing allyl groups (DBPA‐Ph) and 4, 4′‐bis‐(maleimidodiphenyl)methane (BMI) was prepared. The reaction between DBPA‐Ph and BMI was characterized with FTIR. The copolymerization behavior and processability of DBPA‐Ph/BMI prepolymer was studied by differential scanning calorimetry (DSC) and dynamic rheological analysis. The results of DSC indicated that the DBPA‐Ph/BMI system presented two‐stage thermal polymerization attributing to the ene reaction between allyl moieties and maleimide at low temperature (around 263°C) and the ring‐form polymerization of cyano moieties at high temperature (around 332°C), respectively. The results of dynamic rheological analysis indicated, with the introduction of BMI, the curing properties of DBPA‐Ph/BMI system improved. The DBPA‐Ph/BMI copolymers were prepared with relatively shorter curing time and shown high glass transition temperature (>350°C). The DBPA‐Ph/BMI/glass fiber composite laminates were prepared and exhibited relatively better mechanical properties (>440 MPa) and satisfactory thermal properties (>440°C). The outstanding glass transition temperature, better processability, desirable thermal and thermo‐oxidative stabilities demonstrated the introduction of BMI would contribute to the application of DBPA‐Ph. POLYM. COMPOS., 38:1591–1599, 2017. © 2015 Society of Plastics Engineers
Funding Information
  • National Natural Science Foundation (51173021, 51373028)
  • South Wisdom Valley Innovative Research Team Program, “863” National Major Program of High Technology (2012AA03A212)

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