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Thermoresponsive Stiffening with Microgel Particles in a Semiflexible Fibrin Network

Journal Article · · Macromolecules
 [1];  [2];  [2];  [3];  [2];  [2];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois at Urbana-Champaign
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States); Korea Inst. of Science and Technology, Seoul (South Korea)
We report here temperature-responsive soft composites of semiflexible biopolymer networks (fibrin) containing dispersed microgel colloidal particles of poly(N-isopropylacrylamide) (pNIPAM) that undergo a thermodynamically driven deswelling transition above the lower critical solution temperature. Unlike standard polymer particle composites, decreasing the inclusion volume of the particles (by increasing temperature) is concomitant with a striking increase of the overall elastic stiffness of the composite. We observe such a behavior over a wide composition space. The composite elastic shear modulus reversibly stiffens by up to 10-fold over a small change in temperature from 25 to 35 °C. In isolation, the fibrin network and microgel suspension both soften with increased temperature, making the stiffening of the composites particularly significant. We hypothesize that stiffening is caused by the shrinking microgel particles that deform fibrin filaments, and modify the network structure. We further develop a phenomenological model that quantifies this hypothesis, and the derived predictions are qualitatively consistent with our experimental data.
Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-07ER46471
OSTI ID:
1606375
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 8 Vol. 52; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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