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Polymer Classification: Stereospecificity

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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...

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Polymers

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Supramolecular assembly in telechelic polymer blends.

R Elliott¹, Glenn H Fredrickson

¹Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA. relliott@mrl.ucsb.edu

The Journal of Chemical Physics

|October 17, 2009

Summary

Supramolecular assembly in polymer blends depends on bond strength. High affinities lead to longer chains and polydispersity, while specific bonding can form multiblock copolymers and novel phases.

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Area of Science:

Polymer Science
Materials Science
Physical Chemistry

Background:

Investigates supramolecular assembly in polymer melts with reversible bonding.
Explores how chain bonding affinities influence blend structure and phase behavior.

Purpose of the Study:

Theoretically investigate equilibrium supramolecular assembly in telechelic polymer melts.
Analyze the impact of homobonding, heterobonding, and mixed bonding on blend properties.

Main Methods:

Utilized mean-field theory and developed a new integral equation formalism.
Employed random phase approximation and numerical self-consistent field theory.
Modeled polymers as Gaussian threads with Flory-Huggins repulsions.

Main Results:

Low affinities yield monodisperse chains; high affinities create polydisperse blends and chain assembly.
Heterobonding can lead to multiblock copolymers, mesophases, and a novel Lifshitz point indicating emulsification.
Mapped phase diagrams for various bonding scenarios.

Conclusions:

Bonding strength and type critically control supramolecular assembly in polymer blends.
Identified conditions for chain assembly, mesophase formation, and potential emulsification.
The theoretical framework provides insights into complex polymer blend phase behavior.