synthesis and characterization of polyacrylamide based at germany

synthesis and characterization of polyacrylamide based at germany
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  • Which strands in a polymer network contribute to swelling polyacrylamide hydrogels?
  • M. Hua, S. Wu, Y. Ma, Y. Zhao, Z. Chen, I. Frenkel, J. Strzalka, H. Zhou, X. Zhu, X. He Polyacrylamide hydrogels. V. Some strands in a polymer network bear loads, but all strands contribute to swelling Polyacrylamide hydrogels.
  • How strong is a polyacrylamide hydrogel?
  • By contrast, strength of hydrogels have been less studied. A polyacrylamide hydrogel containing high water content exhibits near-perfect elasticity–that is, the stress-stretch curve has negligible hysteresis ( Yang et al., 2019 ), and is insensitive to strain rate ( Hassan et al., 2025 ).
  • What is the fractocohesive length of a polyacrylamide hydrogel?
  • A representative value of the fractocohesive length of a polyacrylamide hydrogel is 1 mm ( Yang et al., 2019 ). Given that polyacrylamide hydrogels typically contain flaws smaller than, say, 0.1 mm, stress-stretch curves of polyacrylamide hydrogels are flaw-insensitive.
  • Which tensile machine is used to measure the stress-stretch curve of polyacrylamide hydrogels?
  • The stress-stretch curve of each sample was measured using a tensile machine (Instron 5966; 100 N load cell). The crosshead velocity was 20 cm/min. For the polyacrylamide hydrogels studied here, the stress-stretch curves are insensitive to stretch rate ( Kim et al., 2021 ). The force and time were recorded by the tensile machine.