1H NMR study of molecular mobility in the interaction of chemical fibers with polymeric binders

Evdokimov, A. M.; Moskalev, V. V.; Talanov, V. L.; Kolonistov, V. P.; Andreev, A. F.; Perepelkin, K. E.

doi:10.1007/bf00605044

Cited by 1 publication

(2 citation statements)

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“…The 1 H NMR in conjugation with magic-angle spinning (MAS) highlights mobile components in complex systems because high mobility weakens the dipolar coupling strength and leads to well-resolved 1 H signals. 28 Because we used whole webs in this study, the signals have components from major ampullate proteins of dragline silk and flagelliform proteins of capture silk, in addition to salts and glycoproteins from the glue droplets. The 1 H MAS spectrum of pristine webs at high humidity shows sharp, wellresolved signals that correspond to the highly mobile web components, while the spectrum of washed webs at high humidity shows broad signals (Figure 1, blue curves).…”

Section: ■ Resultsmentioning

confidence: 99%

“…First, we used solid-state 1 H NMR to test how salts influenced molecular mobility. The 1 H NMR in conjugation with magic-angle spinning (MAS) highlights mobile components in complex systems because high mobility weakens the dipolar coupling strength and leads to well-resolved 1 H signals . Because we used whole webs in this study, the signals have components from major ampullate proteins of dragline silk and flagelliform proteins of capture silk, in addition to salts and glycoproteins from the glue droplets.…”

Section: Resultsmentioning

confidence: 99%

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Direct Solvation of Glycoproteins by Salts in Spider Silk Glues Enhances Adhesion and Helps To Explain the Evolution of Modern Spider Orb Webs

et al. 2014

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The evolutionary origin of modern viscid silk orb webs from ancient cribellate silk ancestors is associated with a 95% increase in diversity of orb-weaving spiders, and their dominance as predators of flying insects, yet the transition's mechanistic basis is an evolutionary puzzle. Ancient cribellate silk is a dry adhesive that functions through van der Waals interactions. Viscid threads adhere more effectively than cribellate threads because of the high extensibility of their axial silk fibers, recruitment of multiple glue droplets, and firm adhesion of the viscid glue droplets. Viscid silk's extensibility is permitted by the glue's high water content, so that organic and inorganic salts present in viscid glue droplets play an essential role in contributing to adhesion by sequestering the atmospheric water that plasticizes the axial silk fibers. Here, we provide direct molecular and macro-scale evidence to show that salts also cause adhesion by directly solvating the glycoproteins, regardless of water content, thus imparting viscoelasticity and allowing the glue droplets to establish good contact. This "dual role" of salts, plasticizing the axial silk indirectly through water sequestration and directly solvating the glycoproteins, provides a crucial link to the evolutionary transition from cribellate silk to viscid silk. In addition, salts also provide a simple mechanism for adhering even at the extremes of relative humidity, a feat eluding most synthetic adhesives.

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Section: ■ Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%