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Visualizing pectin polymer-polymer entanglement produced by interfacial water movement.

Aidan Pierce1, Yifan Zheng1, Willi L Wagner2

  • 1Laboratory of Adaptive and Regenerative Biology, Brigham & Women's Hospital, Harvard Medical School, Boston, MA, United States.

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|August 5, 2020
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Summary

Water movement drives pectin polymer entanglement. Fast movement between films created stranding and delamination, increasing adhesion and cohesion, unlike slow movement which showed no significant entanglement.

Keywords:
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Area of Science:

  • Food science
  • Polymer science
  • Materials science

Background:

  • Pectin polymer-polymer entanglement is crucial for gel properties.
  • Understanding the physical conditions for entanglement is key to controlling pectin-based material performance.

Purpose of the Study:

  • To investigate the role of water movement in creating pectin homopolymer entanglement.
  • To determine the effect of probe velocity on pectin film adhesion and cohesion.

Main Methods:

  • Investigated pectin entanglement by compressing gel phase films with water droplets at variable probe velocities (0.5 mm/sec and 5 mm/sec).
  • Utilized videomicroscopy and scanning electron microscopy (SEM) to observe film behavior during debonding.
  • Quantified adhesion strength and work of cohesion.

Main Results:

  • Slow probe velocity (0.5 mm/sec) showed no significant debonding or entanglement.
  • Fast probe velocity (5 mm/sec) resulted in increased peak adhesion strength, progressive debonding, and higher work of cohesion (p < .001).
  • Videomicroscopy and SEM confirmed pectin stranding and delamination at fast probe velocities.

Conclusions:

  • Water movement acts as the motive force for rapid pectin chain entanglement.
  • Fast water movement between pectin films promotes stranding, delamination, and enhanced cohesive properties.