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Related Concept Videos

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...
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...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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.
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...

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Related Experiment Video

Updated: Jun 12, 2026

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
14:46

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

Published on: January 20, 2018

Tailoring dendronized polymers.

Yongming Chen1, Xingquan Xiong

  • 1Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Sciences, Division of Polymer Science and Materials, Beijing 100190, China. ymchen@iccas.ac.cn

Chemical Communications (Cambridge, England)
|June 2, 2010
PubMed
Summary
This summary is machine-generated.

Dendrimers are precisely controlled synthetic macromolecules. When grafted onto polymers, they form dendronized polymers (denpols) with tunable wormlike nanoobject morphologies.

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Last Updated: Jun 12, 2026

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
14:46

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

Published on: January 20, 2018

Nanosponge Tunability in Size and Crosslinking Density
11:15

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Dendrimers are synthetic macromolecules with precisely controlled size, molar mass, and composition.
  • Their nanoscale dimensions make them suitable as scaffolds for spherical molecules.
  • Grafting dendrimers onto linear polymers yields dendronized polymers (denpols).

Purpose of the Study:

  • To highlight recent advancements in the synthesis of dendronized polymers.
  • To discuss the control over composition and morphology in denpol creation.
  • To explore the unique properties and applications of these one-dimensional nanoobjects.

Main Methods:

  • Synthesis of hyperbranched oligomers (dendrimers).
  • Grafting dendritic segments onto linear polymer backbones.
  • Characterization of resulting polymer morphology and properties.

Main Results:

  • Dendronized polymers exhibit wormlike morphologies due to steric hindrance between dendrons.
  • The flexibility and diameter of denpols are controllable by dendron generation.
  • Denpols function as precisely engineered one-dimensional molecular nanoobjects.

Conclusions:

  • Dendronized polymers represent a significant development in macromolecular science.
  • Their tunable, one-dimensional structure offers potential for novel nanomaterials.
  • Further research into their synthesis and applications is warranted.