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Polymer Classification: Crystallinity

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...

Polymer Classification: Stereospecificity

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...

Polymer Classification: Architecture

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...

Polymers: Molecular Weight Distribution

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.

Characteristics and Nomenclature of Homopolymers

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

Polymers

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...

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Related Experiment Video

Updated: Sep 11, 2025

Polymer Microarrays for High Throughput Discovery of Biomaterials

Polymer Microarrays for High Throughput Discovery of Biomaterials

Published on: January 25, 2012

Small Molecules as Markers for Decoding Plastic-Related Information: A Focus on Polymer Composition.

Yu Li^1,2, Katherine Poisson^1,3, Madison H McMinn^1,3

¹Department of Chemistry and Chemical Biology, College of Science, Northeastern University, Boston, Massachusetts 02115, United States.

Environmental Science & Technology Letters

|August 18, 2025

Summary

This study introduces a novel method using small molecule markers to identify plastic types. These chemical fingerprints can accurately decode plastic information, offering a new approach for plastic identification.

Keywords:

markers nontargeted analysis organic contaminants plastic polymer information small molecules

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Area of Science:

Environmental Science
Analytical Chemistry
Materials Science

Background:

The link between plastics and embedded small molecules is hypothesized but lacks systematic evidence.
Accurate identification of plastic types is crucial for recycling and environmental monitoring.

Purpose of the Study:

To develop and validate a method for identifying plastic types using polymer-specific small molecule markers.
To establish a proof-of-concept for decoding plastic information through chemical signatures.

Main Methods:

Collected and extracted various raw and postprocessed plastic samples.
Utilized a nontargeted analytical method to screen for small molecule features.
Identified and validated polymer-specific small molecule markers.

Main Results:

Observed distinct sets of small molecule features for polyethylene (PE), polypropylene (PP), poly(ethylene terephthalate) (PET), and polystyrene (PS).
Identified 2-101 co-occurring features across raw and processed plastics as potential polymer-specific markers.
Successfully identified the polymer type of plastic bottles using the developed markers, consistent with pyrolysis-gas chromatography/mass spectrometry.

Conclusions:

Small molecule markers can serve as reliable indicators for identifying plastic types.
This approach offers a novel and effective strategy for decoding plastic information and material characterization.