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Related Concept Videos

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Characteristics and Nomenclature of Copolymers01:24

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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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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The extent of the...
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Copolymers as a turning point for large scale polyhydroxyalkanoates applications.

Paolo Costa1, Marina Basaglia1, Sergio Casella1

  • 1Waste-to-Bioproducts Lab, Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Agripolis, Viale dell'Università, 16, 35020 Legnaro, PD, Italy.

International Journal of Biological Macromolecules
|July 3, 2024
PubMed
Summary
This summary is machine-generated.

Polyhydroxyalkanoates (PHAs) copolymers offer sustainable alternatives to traditional plastics. Optimizing PHA production economics hinges on selecting cost-effective microbial carbon sources, especially low-cost waste streams.

Keywords:
BioplasticsCarbon sourceMicrobial biotechnologiesPHA precursorsWaste

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Environmental Science

Background:

  • Traditional plastics pose environmental challenges due to their persistence and limited recyclability.
  • Polyhydroxyalkanoates (PHAs) are biodegradable biopolymers produced by microorganisms, offering a sustainable alternative.
  • Polyhydroxyalkanoate (PHA) copolymers exhibit enhanced properties compared to homopolymers, broadening their applications.

Purpose of the Study:

  • To review current research on polyhydroxyalkanoate (PHA) copolymer production, focusing on the origin of precursors.
  • To categorize PHA copolymer precursors based on economic value: structurally related, unrelated, and waste streams.
  • To highlight the critical role of feedstock selection in the economic feasibility of PHA copolymer production.

Main Methods:

  • Literature review of recent publications on polyhydroxyalkanoate (PHA) copolymer production.
  • Analysis of microbial metabolic pathways, engineered strains, and bioprocess strategies.
  • Categorization of carbon sources based on their economic impact and origin.

Main Results:

  • The choice of microbial carbon source significantly impacts the economic viability of polyhydroxyalkanoate (PHA) copolymer production.
  • Low-cost waste streams represent a promising feedstock category for sustainable PHA copolymer synthesis.
  • Integrating cheap biomass, efficient pretreatment, and robust microorganisms is key to developing versatile, circular PHA polymers.

Conclusions:

  • Polyhydroxyalkanoate (PHA) copolymers present advanced properties and sustainable end-of-life options.
  • The selection of upstream feedstock is a crucial factor for the successful development of polyhydroxyalkanoate (PHA) based plastic substitutes.
  • Further research into cost-effective precursors and efficient bioprocesses is essential for widespread adoption of PHA copolymers.