Progress in the chemistry of functional aramids properties

Mishra, Nikita; Madhad, Himanshu V; Vasava, Dilip V.

doi:10.1002/jhet.4336

Cited by 14 publications

(9 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aramids constitute a high-value, high-performance class of industrial fibres that account for a few percent of the global synthetic fibre production. These fibres with exceptionally high strength (2.4-3 GPa) and modulus of elasticity (45-160 GPa) [124] are well suited for demanding applications such as bullet-proof vests, firefighter protective garments, and in military applications [125][126][127]. Nanofibres of aramids in the size range of 10-100 nm are also used to reinforce nanocomposites [128].…”

Section: Nano-oxides and Aramid Fibresmentioning

confidence: 99%

Effects of UV radiation on natural and synthetic materials

Andrady

Heikkilä

Pandey³

et al. 2023

Photochem Photobiol Sci

View full text Add to dashboard Cite

The deleterious effects of solar ultraviolet (UV) radiation on construction materials, especially wood and plastics, and the consequent impacts on their useful lifetimes, are well documented in scientific literature. Any future increase in solar UV radiation and ambient temperature due to climate change will therefore shorten service lifetimes of materials, which will require higher levels of stabilisation or other interventions to maintain their lifetimes at the present levels. The implementation of the Montreal Protocol and its amendments on substances that deplete the ozone layer, controls the solar UV-B radiation received on Earth. This current quadrennial assessment provides a comprehensive update on the deleterious effects of solar UV radiation on the durability of natural and synthetic materials, as well as recent innovations in better stabilising of materials against solar UV radiation-induced damage. Pertinent emerging technologies for wood and plastics used in construction, composite materials used in construction, textile fibres, comfort fabric, and photovoltaic materials, are addressed in detail. Also addressed are the trends in technology designed to increase sustainability via replacing toxic, unsustainable, legacy additives with ‘greener’ benign substitutes that may indirectly affect the UV stability of the redesigned materials. An emerging class of efficient photostabilisers are the nanoscale particles that include oxide fillers and nanocarbons used in high-performance composites, which provide good UV stability to materials. They also allow the design of UV-shielding fabric materials with impressive UV protection factors. An emerging environmental issue related to the photodegradation of plastics is the generation of ubiquitous micro-scale particles from plastic litter exposed to solar UV radiation. Graphical abstract

show abstract

Section: Nano-oxides and Aramid Fibresmentioning

confidence: 99%

Effects of UV radiation on natural and synthetic materials

Andrady

Heikkilä

Pandey³

et al. 2023

Photochem Photobiol Sci

View full text Add to dashboard Cite

show abstract

“…In this paper, we avoided these shortcomings through another route (Chen et al, 2018(Chen et al, , 2019Colovic et al, 2021;He et al, 2022;Mishra et al, 2021) and a novel nitrogen-phosphorus flame retardant, HOMP, was synthesized after removing the barrier from triazines of insoluble. Most importantly, HOMP improved the flame retardancy of epoxy resin with its molecular structure and mechanism discussed.…”

Section: Synthesismentioning

confidence: 99%

Synthesis of an efficient phosphorus and triazine ring-containing reactive flame retardant for epoxy resin

Meng

Wang

et al. 2023

MMMS

View full text Add to dashboard Cite

PurposeIn order to find an appropriate method to synthesize a new high-efficiency flame retardant for epoxy resin.Design/methodology/approachIn this work, a flame retardant with heterocyclic groups, HOMP, was acquired after removing the obstacle from triazines which was not readily soluble. The molecular structure, thermal and flame retardant properties were fully characterized and analyzed. Also, the mechanism was researched through multi-methodologies. As well, the authors evaluated the effects of HOMP on mechanical properties.FindingsThe results suggested that HOMP helped extinguish the combustion of specimens and could reach an LOI value of 29.2% and the V0 level in the UL-94 test with a phosphorus content of only 0.6wt%. With respect to the mechanism, HOMP was a gas-phase flame retardant and helped generate a thicker carbon protective coating. However, for the mechanical properties, the addition of HOMP enhanced the compressibility, while the tensile strength decreased significantly.Originality/valueThe approach not only simplified the operations but also obtained HOMP with excellent flame retardant properties.

show abstract

“…Meta-aramid (PMIA) is widely used in aerospace, military, transportation and communication fields due to its excellent flame retardancy, mechanical properties, chemical stability and electrical insulation. [1][2][3][4] In addition, as a high-performance fiber, PMIA is often used in the manufacture of high-temperature protective uniforms. However, the regular stacking structure of benzene rings in PMIA molecules as well as the strong and highly oriented intermolecular hydrogen bonds are responsible for the rigidity of the molecular chain and stiffness and brittleness of the fibers, which affect wearing comfort in practical applications.…”

Section: Introductionmentioning

confidence: 99%