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Aging of Polymeric Materials and Structures

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Analysis and Characterization".

Deadline for manuscript submissions: closed (25 May 2023) | Viewed by 2825

Special Issue Editor


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Guest Editor
Engineering Management Department, College of Engineering, Prince Sultan University, Riyadh 66833, Saudi Arabia
Interests: composites; crushing; impact; environmental; FEA; microscale modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

During their lifetime, polymers and polymeric composites suffer as a result of different working conditions that highly affect their behavior. Polymers are extremely sensitive to heat, oxygen, sunlight, the ozone, ionizing radiation, moisture, and similar conditions that cause the degradation of the mechanical properties of the material and its structure. These factors, individually or combined, result in the chemical transformations of molecules, which lead to the degradation of the macromolecules and cross linking. The current Special Issue aims to collect varying contributions concerned with the aging effect on the polymeric materials and structures, including composites under different loading conditions (both experimental and modeling). A chemical and optical assessment of the aging effect on the materials is also of high interest to the current Special Issue. Aging causes the deterioration of the mechanical characteristics of polymers and surface crack growth that sometimes result in catastrophic failure. The current Special Issue aims to determine and explore the different failure mechanisms associated with the different aging conditions, in relation to both the material and structure levels.

Dr. Tamer Ali Sebaey
Guest Editor

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Keywords

  • aging
  • conditioning
  • polymers
  • composites
  • hygrothermal
  • radiation
  • mechanical properties
  • chemical degradation
  • environmental
  • experimental
  • analytical modeling

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Published Papers (1 paper)

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Research

18 pages, 2758 KiB  
Article
Effect of Different Pre-Treatment on the Microstructure and Intumescent Properties of Rice Husk Ash-Based Geopolymer Hybrid Coating
by Mohd Na’im Abdullah, Faizal Mustapha, Kamarul Arifin Ahmad, Mazli Mustapha, Tabrej Khan, Balbir Singh and Tamer A. Sebaey
Polymers 2022, 14(11), 2252; https://doi.org/10.3390/polym14112252 - 31 May 2022
Cited by 12 | Viewed by 2287
Abstract
Despite the growing popularity of rice husk ash (RHA) in various applications, limited research has been devoted to identify the influence of silica content in RHA on the intumescent properties. The present work aims to introduce a novel and economical geopolymer hybrid fire [...] Read more.
Despite the growing popularity of rice husk ash (RHA) in various applications, limited research has been devoted to identify the influence of silica content in RHA on the intumescent properties. The present work aims to introduce a novel and economical geopolymer hybrid fire retardant coating by utilizing the use of RHA. The silica from Rice husk (RH) was extracted using distilled water and hydrochloric acid as leaching agents and subjected to pyrolysis treatment. X-ray fluorescence (XRF) analysis indicated that RH that underwent HCl pre-treatment at 600 °C for one hour produced a high purity amorphous silica content of 93.92%. XRD measurements revealed that HCl pretreatment increased the crystallization temperature of RHA to 1000 °C and retained the amorphous state of silica for 2 h. In a fire resistance test, temperature at the equilibrium and time taken to reach 200 °C for sample S3 (93.92% wt. silica) showed 5.83% and 3.48% improvement compared to sample S1 (87.49% wt. silica). The microstructure analysis showed that sample S1 possessed bigger pores on the coating surface while an increment in silica content in sample S3 produced a dense foam structure. Results from a fire resistance test were supported by the Energy dispersive X-ray (EDX) analysis of the sample. The oxygen-to-carbon ratio of S1 and S3 coating samples were 1.695 and 1.622 respectively, which indicated that lower oxygen–to-carbon ratio in sample S3 coating resulted in better anti-oxidant properties. Interestingly, the increment of SiO2 content in RHA efficiently improved the compactness of the char layer, which resulted in a relatively higher fire-retardant efficiency. RHA proved to be a promising environmentally friendly strategy to replace halogenated fire retardant materials. Full article
(This article belongs to the Special Issue Aging of Polymeric Materials and Structures)
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