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Related Concept Videos

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Updated: Apr 26, 2026

Rapid, Scalable Assembly and Loading of Bioactive Proteins and Immunostimulants into Diverse Synthetic Nanocarriers Via Flash Nanoprecipitation
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Macromol. Rapid commun. 15/2014.

Dipankar Basak1, Rajan Kumar, Suhrit Ghosh

  • 1Polymer Science Unit, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata, 700032, India.

Macromolecular Rapid Communications
|August 5, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for creating functionalized poly(disulfide)s using a stoichiometric imbalance. These polymers can initiate ring-opening polymerization, leading to novel triblock copolymers with degradable segments.

Keywords:
block copolymercondensation reactionpoly(disulfide)sring-opening polymerizationstoichiometric imbalance

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Telechelic polymers with disulfide linkages offer unique properties for advanced material applications.
  • Functionalization of polymers is crucial for tailoring their behavior and initiating further polymerization.
  • Degradable polymers are essential for biomedical applications and sustainable materials.

Purpose of the Study:

  • To develop an efficient polycondensation route for telechelic poly(disulfide)s.
  • To functionalize these poly(disulfide)s for use as macro-initiators.
  • To synthesize triblock copolymers with a degradable middle block via ring-opening polymerization.

Main Methods:

  • Polycondensation of 2,2'-dithiodipyridine and 1,6-hexanedithiol using stoichiometric imbalance.
  • Selective thiol-disulfide exchange for functionalization of terminal pyridyl disulfide groups.
  • Ring-opening polymerization (ROP) of lactide initiated by the functionalized poly(disulfide)s.

Main Results:

  • An efficient method for synthesizing telechelic poly(disulfide)s was established.
  • Functionalized poly(disulfide)s were successfully prepared via thiol-disulfide exchange.
  • Triblock copolymers with a degradable poly(lactide) middle block were synthesized.

Conclusions:

  • The developed polycondensation route provides access to versatile telechelic poly(disulfide)s.
  • Functionalized poly(disulfide)s serve as effective macro-initiators for ROP.
  • This strategy enables the synthesis of advanced triblock copolymers with tunable properties and degradability.