High-Temperature Behavior of Polymers and Composites

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Materials Processes".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 943

Special Issue Editors


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Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli "Federico II", P.le Tecchio, 80, 80125 Napoli, Italy
Interests: biomass; thermochemical conversion processes; transport phenomena; computational modeling; biorefinery; response to fire of polymers and composite materials
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Guest Editor
Istituto di Ricerche sulla Combustione IRC-CNR P.le V. Tecchio, 80-80125 Napoli, Italy
Interests: biomass; pyrolysis; bio-char; bio-oil; thermogravimetric analysis; biomass pyrolysis kinetics; bio-char oxidation kinetics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymer composites are currently used in a variety of structural and thermal protection applications, including aerospace, marine automotive, civil infrastructures, chemical processing, sporting goods, and consumer products, due to their outstanding physical, chemical, and mechanical properties. However, high flammability is one of the main drawbacks as material characteristics are profoundly modified at high temperatures, typical of a fire scenario. Thus, new composites are continuously formulated and tested to understand the fundamentals of thermal and oxidative decomposition, fire development, and propagation. Predictive mathematical models can help to explain the physical and chemical mechanisms that control the thermo-chemical conversion and support the multidisciplinary design of practical appliances and expensive fire testing reduction.

This Special Issue seeks innovative experimental and numerical studies on the high-temperature response of polymers and composites within the scope of improving the design of reliable and efficient thermal protection systems. Studies on both a microscopic (TGA) and a macroscopic (fire testing) scale are encouraged. 

Prof. Dr. Antonio Galgano
Dr. Carmen Branca
Guest Editors

Manuscript Submission Information

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Keywords

  • polymers
  • composites
  • fire testing
  • thermal degradation
  • combustion
  • flammability
  • small-scale experimentation
  • mathematical modeling

Published Papers (1 paper)

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Research

20 pages, 12534 KiB  
Article
Effects of the PMMA Molecular Weight on the Thermal and Thermo-Oxidative Decomposition as the First Chemical Stage of Flaming Ignition
by Antonio Galgano and Colomba Di Blasi
Processes 2024, 12(1), 219; https://doi.org/10.3390/pr12010219 - 19 Jan 2024
Viewed by 638
Abstract
The piloted and the spontaneous ignition of low and high molecular weight (LMW and HMW) polymethyl methacrylate are simulated using a one-dimensional condensed-gas phase model for constant heat fluxes in the range of 25–150 kW/m2. Purely thermal (nitrogen) and thermo-oxidative (air) [...] Read more.
The piloted and the spontaneous ignition of low and high molecular weight (LMW and HMW) polymethyl methacrylate are simulated using a one-dimensional condensed-gas phase model for constant heat fluxes in the range of 25–150 kW/m2. Purely thermal (nitrogen) and thermo-oxidative (air) decomposition is considered, described by a single and four-step kinetics for the low and high molecular weight polymer, respectively. Different optical properties are also examined. The same trends of the ignition time and other ignition parameters are always observed. Due to a more significant role of the chemical kinetics, the effects of the sample molecular weight and reaction atmosphere are higher at low heat fluxes. Times are shorter for the black HMW samples and thermo-oxidative kinetics. For piloted ignition, factors are around 2.8–1.6, whereas for thermal decomposition, they are 1.3–1.2. The corresponding figures are 1.8–1.3 and 1.3–1.1, in the same order, for the spontaneous ignition. Overall, the effects of the molecular weight are more important than those related to the reaction kinetics environment. These differences are confirmed by the comparison between predictions and measurements. Full article
(This article belongs to the Special Issue High-Temperature Behavior of Polymers and Composites)
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