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Processing and Characterization of Bismaleimide Composites Modified with Core-Shell Siloxane (CSS)/Carbon Nanotubes (CNTs)

Graduate #109
Discipline: Technology and Engineering
Subcategory: Materials Science

Chukwuma Nweke - Tuskegee University


In this work, an economical out-of-autoclave processing method was developed to prepare bismaleimide, BMI-1 composites. In addition, BMI-1 resin was modified with hydroxyl functionalized carbon nanotubes (CNTs) and core-shell siloxane to optimize the mechanical, viscoelastic and thermal properties. 3-point bend test, dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) were conducted. The addition of CSS lead to decrease in flexural and viscoelastic properties in comparison to neat BMI-1 samples. However, the BMI-1/CNTs samples showed significant improvement in these properties with a optimum at 0.15wt. % loading. Further increase in CNT wt. % loading showed a declining trend in these properties which can be attributed to poor dispersion of CNTs. Scanning electron micrographs of fractured specimens showed rougher fracture surface in 0.15 wt. % CNT samples indicating the high resistance offered by the material prior to failure. In contrast, crack was found to initiate from a localized region in 0.5 wt. % CNTs samples which may be the remains of poorly dispersed CNTs. Agglomerated CNTs in polymers acts as precursor to crack formation causing premature failure. A smoother fracture surface was observed in both neat BMI-1 and BMI-1/CSS samples.

Not Submitted

Funder Acknowledgement(s): This research work is supported by the AFRL, NSF-EPSCoR.

Faculty Advisor: Shaik Zainuddin, szainuddin@mytu.tuskegee.edu

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This material is based upon work supported by the National Science Foundation (NSF) under Grant No. DUE-1930047. Any opinions, findings, interpretations, conclusions or recommendations expressed in this material are those of its authors and do not represent the views of the AAAS Board of Directors, the Council of AAAS, AAAS’ membership or the National Science Foundation.

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