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Related Concept Videos

Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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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Related Experiment Video

Updated: May 7, 2026

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

Published on: October 23, 2015

Low density biodegradable shape memory polyurethane foams for embolic biomedical applications.

Pooja Singhal1, Ward Small, Elizabeth Cosgriff-Hernandez

  • 1Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA; Department of Biomedical Engineering, 5045 Emerging Technologies Building, 3120 Texas A&M University, College Station, TX 77843-3120, USA.

Acta Biomaterialia
|October 5, 2013
PubMed
Summary
This summary is machine-generated.

Biodegradable shape memory polymer foams were developed for minimally invasive embolic applications. These smart biomaterials offer controlled degradation and shape recovery for potential use as non-permanent implants.

Keywords:
Degradation rateFTIRLow density foamsPolycaprolactone triolShape memory polyurethane

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Low density shape memory polymer (SMP) foams are promising for minimally invasive embolic applications.
  • Their unique shape memory properties allow for catheter-based delivery and in-situ expansion.
  • Existing SMP foams lack controlled biodegradability for temporary implant use.

Purpose of the Study:

  • To develop novel low density, biodegradable SMP foams for biomedical applications.
  • To introduce controlled degradation into highly crosslinked SMP structures.
  • To create a new class of "smart" non-permanent implantable scaffolds.

Main Methods:

  • Synthesized SMP foams using polycaprolactone triol (PCL-t) and other polyfunctional hydroxyl monomers.
  • Controlled degradation by adjusting PCL-t concentration and material hydrophobicity.
  • Characterized foam morphology, shape recovery, actuation temperature, and degradation rate.

Main Results:

  • Developed porous SMP materials with uniform cell morphology and excellent shape recovery.
  • Achieved controllable actuation temperature and tunable degradation rates.
  • Demonstrated the potential for creating biodegradable SMP scaffolds.

Conclusions:

  • Introduced controlled biodegradability into low density SMP foams.
  • These materials represent a new class of "smart" non-permanent implants.
  • Potential applications include minimally invasive embolic and scaffold-based therapies.