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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...

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Synthesis of Thermogelling Poly(N-isopropylacrylamide)-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering
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End-grafted low-molecular-weight PNIPAM does not collapse above the LCST.

X Zhu1, C Yan, F M Winnik

  • 1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 28, 2006
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End-grafted poly(N-isopropylacrylamide) (PNIPAM) shows minimal change above its LCST, functioning as a steric stabilizer. Below the LCST, it exhibits phase separation, impacting its use in drug delivery systems.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biophysics

Background:

  • Temperature-responsive polymers like poly(N-isopropylacrylamide) (PNIPAM) are crucial for smart materials.
  • Understanding their interfacial behavior is key for applications in drug delivery and biomaterials.
  • End-grafting offers precise control over polymer conformation and interactions.

Purpose of the Study:

  • To quantify the interfacial properties of end-grafted PNIPAM.
  • To investigate PNIPAM behavior above and below its lower critical solution temperature (LCST).
  • To assess the implications for liposomal drug release and steric stabilization.

Main Methods:

  • Direct force measurements using atomic force microscopy.
  • Experiments conducted between identical PNIPAM films and between PNIPAM films and lipid membranes.
  • Measurements performed above and below the LCST of PNIPAM (32°C).

Main Results:

  • PNIPAM extension showed no significant change above the LCST; polymers did not adhere.
  • Below the LCST, vertical phase separation occurred, forming a diluter outer layer and dense surface layer.
  • Force profiles aligned with polymer theory at large separations but deviated at small separations.
  • Crucially, end-grafted PNIPAM did not collapse above the LCST at investigated densities and molecular weights.

Conclusions:

  • End-grafted PNIPAM's lack of collapse above LCST has implications for liposomal drug release systems.
  • These short PNIPAM chains extend their utility as steric stabilizers over a broader temperature range.
  • The study provides fundamental insights into PNIPAM interfacial behavior relevant to nanomedicine and surface coatings.