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Related Concept Videos

Polymers02:34

Polymers

34.0K
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...
34.0K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.6K
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...
2.6K
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.4K
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...
2.4K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
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...
3.4K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.6K
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.
7.6K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.0K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.0K

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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PLA Block Polymers: Versatile Materials for a Sustainable Future.

Daniel M Krajovic1, Margaret S Kumler2, Marc A Hillmyer2

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.

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Sustainable poly(lactide) (PLA) block polymers offer a renewable alternative to commodity plastics. Research highlights their synthesis, structure, and mechanical properties for advanced material applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Sustainable Chemistry

Background:

  • Block polymers offer unique properties through self-assembly, surpassing homopolymers.
  • A need exists for sustainable alternatives to conventional block polymers.
  • Poly(lactide) (PLA) is a promising renewable and industrially compostable material.

Purpose of the Study:

  • To review recent advancements in poly(lactide)-containing block polymers.
  • To discuss synthesis, mesostructural characteristics, and mechanical properties.
  • To provide an outlook on the future of PLA block polymers.

Main Methods:

  • Review of recent literature on PLA block polymers.
  • Analysis of synthesis strategies for PLA-based block copolymers.
  • Evaluation of structure-property relationships, including mechanical performance.

Main Results:

  • PLA block polymers can be synthesized with tunable properties.
  • Mesostructural control enables diverse material architectures.
  • Mechanical properties range from elastomers to tough plastics.

Conclusions:

  • PLA block polymers represent a significant advancement in sustainable materials.
  • Further research will unlock new applications and enhance performance.
  • The field shows exciting potential for future innovations.