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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

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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.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Step-Growth Polymerization: Overview01:03

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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.
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Molecular Weight of Step-Growth Polymers01:08

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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.
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Tunable and Degradable Dynamic Thermosets from Compatibilized Polyhydroxyalkanoate Blends.

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This study engineered a biodegradable polymer blend from polyhydroxyalkanoates (PHAs). The resulting dynamic thermosets are degradable and reprocessable, offering sustainable alternatives for cross-linked polymers.

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Area of Science:

  • Polymer Science and Engineering
  • Biotechnology and Bioengineering
  • Materials Science

Background:

  • Polyhydroxyalkanoates (PHAs) are biobased polyesters with potential as degradable thermoplastic replacements.
  • The chemical diversity of PHAs suggests their utility in creating reversible, degradable thermosets.
  • Brittleness in some PHA copolymers necessitates strategies for improved mechanical properties.

Purpose of the Study:

  • To engineer Pseudomonas putida KT2440 for synthesizing poly(3-hydroxybutyrate-co-3-hydroxyundecenoate) (PHBU).
  • To develop compatible, dynamic thermoset blends using PHBU and a soft PHA copolymer.
  • To evaluate the degradability and thermomechanical properties of the resulting dynamic thermoset blends.

Main Methods:

  • Genetic engineering of *Pseudomonas putida* KT2440 to produce PHBU.
  • Physical blending of PHBU with poly(3-hydroxydecanonate-co-3-hydroxyundecenoate) at various ratios.
  • Installation of dynamic boronic ester cross-links using thiol-ene click chemistry.
  • Characterization of blend immiscibility via scanning electron microscopy.
  • Assessment of thermomechanical profiles and biological degradation in freshwater.

Main Results:

  • Successful synthesis of PHBU containing both 3-hydroxybutyrate and unsaturated 3-hydroxyundecenoate.
  • Creation of compatibilized dynamic thermoset blends with tunable thermomechanical properties (hard, medium, soft).
  • Achieved timely mass loss in biological degradation experiments, demonstrating degradability of cross-linked blends.
  • Demonstrated the potential for reprocessing the dynamic thermoset materials.

Conclusions:

  • A two-component platform for producing degradable and reprocessable dynamic thermoset blends from PHA copolymers was established.
  • The developed materials offer a sustainable alternative to conventional cross-linked polymers.
  • This approach enables tailored PHA-based materials suitable for diverse cross-linked polymer applications.