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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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...
Characteristics and Nomenclature of Copolymers01:24

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...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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...
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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.
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Well-defined syndiotactic polystyrene-b-atactic polystyrene stereoblock polymers.

Liana Annunziata1, Yann Sarazin, Michel Duc

  • 1UMR 6226 CNRS-Université de Rennes 1, Organométalliques et Catalyse, Campus de Beaulieu, Rennes Cedex, France.

Macromolecular Rapid Communications
|April 1, 2011
PubMed
Summary
This summary is machine-generated.

New stereoblock polymers of syndiotactic polystyrene-atactic polystyrene (sPS-b-aPS) were synthesized. These novel polymers exhibit faster crystallization than traditional blends, particularly at higher atactic polystyrene content.

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Published on: October 10, 2016

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Stereoblock polymers offer unique properties compared to random copolymers or blends.
  • Controlled synthesis of well-defined stereoblock polymers remains a challenge.

Purpose of the Study:

  • To synthesize novel, well-defined syndiotactic polystyrene-atactic polystyrene (sPS-b-aPS) stereoblock polymers.
  • To investigate the crystallization behavior of these new materials.

Main Methods:

  • A two-step synthesis combining pseudo-living Ziegler-Natta polymerization and atom transfer radical polymerization (ATRP).
  • End-capping of syndiotactic polystyrene (sPS) with bromine atoms to create macroinitiators.
  • Characterization using NMR spectroscopy, HT-GPC, and DSC.

Main Results:

  • Successfully synthesized sPS-b-aPS stereoblock polymers with controlled compositions.
  • Demonstrated that sPS-b-aPS crystallize faster than sPS/aPS blends.
  • Observed amplified crystallization enhancement at 80% atactic polystyrene content.

Conclusions:

  • Developed a robust method for synthesizing sPS-b-aPS stereoblock polymers.
  • Stereoblock architecture significantly enhances crystallization kinetics compared to blends.
  • These findings open avenues for advanced polymer materials with tailored properties.