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Related Concept Videos

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

Physical Properties of Ethers02:17

Physical Properties of Ethers

Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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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...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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Updated: Jul 2, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Published on: December 16, 2022

Miscibility and Cocrystallization in Ethylene-Vinyl Alcohol Copolymer Blends.

Asmita Ghosh1, Richard A Register1

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544-5263, United States.

ACS Applied Polymer Materials
|July 1, 2026
PubMed
Summary

Understanding ethylene-vinyl alcohol (EVOH) copolymer compatibility is key for recycling mixed plastics. This study reveals how composition differences affect EVOH blend miscibility and cocrystallization, crucial for improving recyclability.

Keywords:
CocrystallizationEVOHMiscibilityMixing ThermodynamicsPolymer BlendThin Film

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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)
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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)

Published on: May 20, 2019

Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Ethylene-vinyl alcohol (EVOH) copolymer compatibility is vital for recycling mixed plastic waste streams.
  • Understanding blend behavior is essential for developing effective recycling strategies.

Purpose of the Study:

  • To investigate melt miscibility and cocrystallization in binary blends of EVOH copolymers with varying ethylene content.
  • To determine the influence of compositional differences on EVOH blend properties.

Main Methods:

  • Optical microscopy and Atomic Force Microscopy (AFM) to assess blend morphology.
  • Differential Scanning Calorimetry (DSC) to analyze thermal transitions (melting and crystallization).
  • Analysis of blends with up to 21 mol % composition difference.

Main Results:

  • Miscible blends appeared homogeneous in melt; immiscible blends showed phase separation via AFM.
  • EVOH blends with modest composition differences exhibited cocrystallization, indicated by single DSC peaks.
  • Partial cocrystallization occurred even in phase-separated blends due to molten domain miscibility.
  • Cocrystallization extent depended on freezing point differences and cooling rate.

Conclusions:

  • The maximum compositional difference for EVOH miscibility is influenced by average comonomer content, defining a 'miscibility window'.
  • Copolymer composition significantly impacts miscibility and cocrystallization in EVOH blends.
  • Findings provide insights into enhancing the recyclability of mixed EVOH waste streams.