Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

3.1K
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...
3.1K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

4.7K
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.
4.7K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

3.7K
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...
3.7K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.7K
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...
2.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Thermoresponsive nanoemulsion-based gel synthesized through a low-energy process.

Nature communications·2019
See all related articles

Related Experiment Video

Updated: Jan 16, 2026

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy
05:05

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy

Published on: June 6, 2025

733

Polymer Blend Spiking Method for Quantifying Polypropylene Variants in 100% Polypropylene Blends.

Meysam Hashemnejad1, Ami Doshi1

  • 1Cincinnati Technology Center, LyondellBasell, 11530 Northlake Drive, Cincinnati, OH 45249, USA.

Polymers
|September 27, 2025
PubMed
Summary

Accurately identifying polypropylene types in recycled materials is crucial for effective recycling. A new crystallization elution fractionation (CEF) method precisely quantifies Homo-PP and Random-PP in recycled polypropylene blends.

Keywords:
compositional analysiscrystallization elution fractionation (CEF)polyethylenepolyolefin characterizationpolypropylenepost-consumer recyclate (PCR)

More Related Videos

MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups
06:16

MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups

Published on: October 3, 2025

1.5K
Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
09:16

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene

Published on: May 20, 2019

8.2K

Related Experiment Videos

Last Updated: Jan 16, 2026

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy
05:05

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy

Published on: June 6, 2025

733
MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups
06:16

MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups

Published on: October 3, 2025

1.5K
Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
09:16

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene

Published on: May 20, 2019

8.2K

Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Accurate characterization of post-consumer recycled (PCR) polypropylene is vital for optimizing mechanical recycling and blending with virgin polymers.
  • Distinguishing between isotactic Homo-PP (Homo-PP), Random-PP, and non-crystalline PP components in 100% PP materials is challenging.
  • Existing methods struggle to precisely quantify PP variants in complex recycled streams.

Purpose of the Study:

  • To develop and validate a solution-based crystallization elution fractionation (CEF) technique for precise PP variant quantification.
  • To enable accurate determination of Homo-PP, Random-PP, and non-crystalline PP content in recycled polypropylene.
  • To support informed material selection and enhance the efficiency of polypropylene recycling operations.

Main Methods:

  • A novel solution-based crystallization elution fractionation (CEF) technique was employed.
  • Linear low-density polyethylene (LLDPE) was introduced to facilitate the separation of Homo-PP from Random-PP in 100% PP samples.
  • Established calibration curves were utilized for quantitative analysis of PP variants.

Main Results:

  • The CEF technique successfully separated and quantified Homo-PP and Random-PP in PP blend systems.
  • Accurate quantification was achieved across a wide composition range, from approximately 5 wt.% to 95 wt.% Random-PP.
  • The method effectively resolved Homo-PP, Random-PP, and non-crystalline PP fractions.

Conclusions:

  • The proposed CEF method provides a robust solution for characterizing PP variants in recycled materials.
  • This technique offers valuable insights into PP composition, aiding in recycling process optimization.
  • Enhanced understanding of PCR PP composition promotes more sustainable and efficient polymer recycling.