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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

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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Characteristics and Nomenclature of Copolymers

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...
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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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...
Polymers02:34

Polymers

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 properties that they exhibit. Additionally,...
Polymers02:34

Polymers

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 properties that they exhibit. Additionally,...

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In situ copolyesters containing poly(L-lactide) and poly(hydroxyalkanoate) units.

Dahlia Haynes1, Nilmini K Abayasinghe, Graham M Harrison

  • 1Department of Chemistry, Clemson University, Clemson, South Carolina 29634-0973, USA.

Biomacromolecules
|March 21, 2007
PubMed
Summary

Researchers created novel polylactide-co-polyhydroxyalkanoate copolymers using ring-opening polymerization. Polyhydroxyalkanoate successfully initiated polylactide synthesis, yielding unique materials with distinct thermal properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Polylactide (PLA) and polyhydroxyalkanoate (PHA) are biodegradable polymers with distinct properties.
  • Developing novel copolymers can enhance material performance and expand applications.

Purpose of the Study:

  • To synthesize in situ copolyesters of PLA and PHA.
  • To investigate the feasibility of using PHA as a macroinitiator for PLA synthesis.
  • To characterize the properties of the resulting copolymers.

Main Methods:

  • Ring-opening polymerization of L-lactide using PHA as a macroinitiator.
  • Stannous octoate was used as a catalyst.
  • Characterization techniques included FT-IR, GPC, DSC, optical microscopy, NMR, and TGA.

Main Results:

  • Novel PLA-PHA copolyesters were successfully synthesized with PHA incorporation (20 wt %).
  • The copolymers exhibited number-average molecular weights (Mn) between 25-50 KDa and low polydispersities (1.8-2.3).
  • Differential Scanning Calorimetry (DSC) revealed distinct crystallization and melting transitions compared to homopolymers and blends, indicating successful copolymerization.

Conclusions:

  • Polyhydroxyalkanoate (PHA) is reactive and effective as a macroinitiator for the ring-opening polymerization of lactide.
  • The synthesis yields novel PLA-PHA copolymers with unique thermal characteristics.
  • This method provides a pathway for creating tailored biodegradable copolyesters.