Polybenzimidazole (PBI) Prepreg II: Improved Elevated Temperature Properties with Autoclave Processability

Below of the abstract of a paper Dr. Steiner co-authored on this topic.

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Polybenzimidazoles are heterocyclic polymers which are known for their outstanding thermal and chemical stability. Hoechst Celanese has recently developed PBI (2,2′-(m-phenylene)-5,5′-bibenzimidazole) as an engineering plastic with the trade name Celazole. The polymer has excellent compressive strength, high tensile strength and modulus, and a glass transition temperature of 453°C (P. A. Steiner and R. B. Sandor, High Perf. Polym., 3, 139 (1991)). Low molecular weight, oligomeric forms of PBI have been used in the past as a composite matrix material to produce stiff and boardy prepregs. More recently medium molecular weight PBI (12 000-20 000 weight average) has been used in combination with N,N-dimethylacetamide (DMAc) solvent to produce prepregs with excellent tack and drape. These prepregs have significantly reduced condensation by-products resulting in improved processability and properties. Reported herein are composite mechanical properties on the low molecular weight PBI prepregs illustrating their improved performance and processability.

About Paul Steiner, PhD CQA

Thank you for visiting. With over 38 years in industry, Dr. Paul Steiner offers Expert Consultant and/or Expert Witness services in: 1. all areas related to developing/formulating, processing, testing, failure analysis and use of adhesives/resins and fiber reinforced composites in all applications from aerospace to medical devices and; 2. Expertise in regulatory compliance and processing of pharmaceuticals (and biologics) and medical devices. In addition, as an ASQ Certified Quality Auditor Dr. Steiner has led 300+ audits on 4 continents. Dr. Steiner is your source for advice on adhesive sourcing, selection and processing. He pioneered the use of fiber composites in aerospace and assisted in expanding their role as structural materials for medical devices, general construction, etc. His expertise covers thermoset, thermoplastic, UV cure and PSAs (pressure sensitive adhesives). Resins include epoxies, vinyl esters, silicones, phenolics, urethanes, cyanoacrylates, polyimides, HDPE, PEEK, Ultem, etc.
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