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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...
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Polymer Classification: Architecture

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Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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Microbial Bioremediation of Plastics

Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...

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Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces
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Published on: September 26, 2014

Sustainable Design of High-Performance Polyurethanes Using Medium-Chain-Length Polyhydroxyalkanoates.

Jasmina Nikodinovic-Runic1, Chebrolu Venkateswara Rao1, Maciej Guzik2

  • 1Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11052 Belgrade, Serbia.

Polymers
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces novel bio-based polyurethanes using renewable medium-chain-length polyhydroxyalkanoates (mcl-PHAs) and castor oil. These sustainable polymers offer tunable properties and demonstrate excellent biocompatibility for advanced applications.

Keywords:
bio-polyurethanecastor oilgreen polyurethanesmcl-polyxydroxyalkanoatessustainable materials

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Area of Science:

  • Polymer Science and Engineering
  • Sustainable Materials Development
  • Biomaterials

Background:

  • The circular economy drives demand for high-performance, sustainable polymers from renewable resources.
  • Medium-chain-length polyhydroxyalkanoates (mcl-PHAs) are biodegradable polyesters with tunable properties, suitable for advanced applications.
  • Polyurethanes (PUs) synthesis traditionally relies on petrochemical feedstocks, prompting research into greener alternatives.

Purpose of the Study:

  • To develop novel bio-based polyurethanes (PUs) by incorporating mcl-PHAs as flexible soft segments.
  • To investigate the structure-property relationships of PUs synthesized with varying ratios of mcl-PHAs and castor oil (CO).
  • To evaluate the biocompatibility and eco-toxicological profile of the novel bio-based PUs.

Main Methods:

  • Polyurethane networks synthesized using castor oil (CO) and mcl-PHAs as polyols, and hexamethylene diisocyanate (HMDI) as the hard segment.
  • Systematic variation of the mcl-PHA/CO ratio from 100/0 to 0/100 to tune material properties.
  • Comprehensive characterization including thermal analysis, mechanical testing, swelling behavior, and morphology assessment.
  • In vitro biocompatibility testing with MRC-5 fibroblasts and eco-toxicological evaluation using *Caenorhabditis elegans*.

Main Results:

  • Successful synthesis of bio-based PUs confirmed by urethane bond formation.
  • Materials exhibited tunable thermal and mechanical properties, with increased mcl-PHA content enhancing elasticity.
  • Predominantly amorphous structures were observed, with phase organization influenced by mcl-PHA content.
  • Adjustable swelling behavior and morphology were achieved.
  • In vitro biocompatibility and eco-toxicological assessments confirmed the absence of toxicity.

Conclusions:

  • Medium-chain-length polyhydroxyalkanoates (mcl-PHAs) are effectively utilized as sustainable, flexible soft segments in polyurethane synthesis.
  • The developed bio-based PUs demonstrate tunable properties and competitive mechanical performance.
  • These novel materials present a promising, non-toxic alternative for advanced polymer applications within a circular economy framework.