The thermal degradation of polyethylene terephthalate

Marshall, I.; Todd, Audrey

doi:10.1039/tf9534900067

Cited by 150 publications

(53 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…28 There is, however, some controversy regarding the detailed effects exerted on the fibers by UV radiation. Thus, while the energy of UV photons might be sufficient to cause the breaking of covalent bonds in silk, 29 ' 30 as it has been found in other polymeric materials, 31 the energy of the radicals is also high enough to create new crosslinks between protein chains. 25 Additionally, there is also a debate on the nature of the amino acids that are primarily affected by UV radiation.…”

Section: Introductionmentioning

confidence: 99%

Unexpected behavior of irradiated spider silk links conformational freedom to mechanical performance

et al. 2015

View full text Add to dashboard Cite

Silk fibers from Argiope trifasciata and Nephiía inaurata orb-web weaving spiders were UV irradiated to modify the molecular weight of the constituent proteins. Fibers were characterized either as forcibly silked or after being subjected to maximum supercontraction. The effect of irradiation on supercontraction was also studied, both in terms of the percentage of supercontraction and the tensile properties exhibited by irradiated and subsequently supercontracted fibers. The effects of UV exposure at the molecular level were assessed by polyacrylamide gel electrophoresis and mass spectrometry. It is shown that UV-irradiated fibers show a steady decrease in their main tensile parameters, most notably, tensile strength and strain. The combination of the mechanical and biochemical data suggests that the restricted conformational freedom of the proteins after UV irradiation is critical in the reduction of these properties. Consequently, an adequate topological organization of the protein chains emerges as a critical design principle in the performance of spider silk.

show abstract

Section: Introductionmentioning

confidence: 99%

Unexpected behavior of irradiated spider silk links conformational freedom to mechanical performance

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The stronger BS of the silk of diurnal N. clavata spiders could be attributed to crosslinks between protein molecules. 10 This theory could account for the observed peaks of the BS as a consequence of the superposition of two factors: a decrease in the molecular weight caused by UV-induced chemical composition 17,18 and an increase in the molecular weight caused by UV-induced crosslinks. 19,20 Infrared and Raman spectra were obtained to ascertain the existence of crosslinks in the draglines after UV irradiation.…”

Section: Discussionmentioning

confidence: 99%

Evolution of spiders from nocturnal to diurnal gave spider silks mechanical resistance against UV irradiation

Osaki

2010

Polym J

View full text Add to dashboard Cite

During their evolutionary history, some species of spiders have changed from a nocturnal to a diurnal lifestyle, and the important change in their environment was irradiation by sunlight. Orb webs of diurnal spiders may be markedly affected by exposure to ultraviolet (UV) irradiation, whereas those of nocturnal spiders may be unaffected. It is of great interest to consider the effects of UV rays on the mechanical properties of spider silks from the viewpoint of evolution. The webs of orb-weaving spiders must trap insect prey, which closely relates to the breaking energy of the spider silk constituting the orb webs. The effects of UV rays on the mechanical properties, particularly the mechanical breaking energy, of the silks of diurnal and nocturnal spiders were investigated. UV rays mechanically strengthened the draglines of diurnal Nephila clavata and two other kinds of diurnal spiders (Leucauge blanda and Argiope bruennichii), suggesting that the ability of the orb web to capture insects requires less maintenance. However, UV rays mechanically weakened the draglines of nocturnal Yaginumia sia and one other kind of nocturnal spider (Neosona nautica), suggesting a decrease in the ability of the orb web to capture insects. The results provide strong support that diurnal spiders are in a more evolved stage than nocturnal spiders, so they secrete silks with an evolved mechanical resistance against UV irradiation. This study suggests a means to search for biological materials with resistance to UV rays.

show abstract

“…An alternative primary scission process involving a-cleavage has been proposed by Marshall and Todd [12] and, based upon an ester bond dissociation energy of 368 kJ mall', seems a likely route for carbon monoxide production:…”

Section: Discussionmentioning

confidence: 99%

Influence of temperature and environment on the thermal decomposition of poly(ethylene terephthalate) fibres with and without the flame retardant tris(2,3-dibromopropyl) phosphate

Day

Wiles

1984

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

The thermal degradation of polyethylene terephthalate

Cited by 150 publications

References 0 publications

Unexpected behavior of irradiated spider silk links conformational freedom to mechanical performance

Unexpected behavior of irradiated spider silk links conformational freedom to mechanical performance

Evolution of spiders from nocturnal to diurnal gave spider silks mechanical resistance against UV irradiation

Influence of temperature and environment on the thermal decomposition of poly(ethylene terephthalate) fibres with and without the flame retardant tris(2,3-dibromopropyl) phosphate

Contact Info

Product

Resources

About