Polymer Chain
Polymer Chain - Related Videos
02:34
Polymers
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2020
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 properties that they exhibit. Additionally,...
08:44
Tension Tests of Polymers
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Polymeric materials are widely used in civil structures, with uses ranging from very soft sealants to more rigid pipes in water and wastewater systems. The most basic definition of a polymer is a molecular structure with repeating subunits. The term polymer comes from Greek, where "poly" means many, and "-mer" means basic unit. Monomers, or single mers, are the specific repeating units. With...
01:28
Electron Transport Chains
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2019
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle. The ETC is comprised of...
08:12
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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2022
Here, we describe protocols for the preparation of trans-cyclobutane fused cyclooctenes (tCBCO), their polymerization to prepare depolymerizable olefinic polymers, and the depolymerization of these polymers under mild conditions. Additionally, protocols for the preparation of depolymerizable networks and compression molding of rigid linear plastics based on this system are described.
13:57
Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Cited by 4 •
2014
The methodology to perform friction force microscopy experiments for contacting brushes is presented: Two polymer brushes that are grafted from (a) substrates and (b) colloidal probes are slid to show that, by using two contacting immiscible brush systems, friction in sliding contacts is reduced compared to miscible brush systems.
FAQs
Architecture determines how molecular structures interact and move. Molecular weight, branching, cross-linking, and chemical composition can alter flexibility, strength, solubility, and thermal stability. For example, changes in branching or cross-linking modify how chains are organized, while composition affects their chemical behavior. Connecting these structural features to performance helps guide the design of plastics, fibers, coatings, and biological macromolecules.
Chain-growth and step-growth polymerization connect monomers through different reaction patterns. The overview identifies both as routes for forming polymer chains, but does not assign specific monomers or reaction conditions to either process. Distinguishing these mechanisms remains important because the polymerization route is part of the chemical basis used to understand how chain structures develop and how resulting materials may perform.
Molecular weight, branching, cross-linking, and chemical composition are key structural variables. Molecular weight describes the scale of the chain population, whereas branching changes chain architecture and cross-linking creates connections between chains. Together with composition, these features influence flexibility, strength, solubility, and thermal stability. Comparing them allows chemists to explain why polymers with different structures show different material behaviors.
A useful analysis begins by examining molecular weight, branching, cross-linking, and chemical composition, then comparing those features with observed properties. The relevant outcomes include flexibility, strength, solubility, and thermal stability. This structure-property approach helps researchers identify which aspects of chain architecture support a desired performance and informs the design of materials for particular chemical or practical requirements.
Polymer-chain analysis supports the development of packaging, adhesives, drug delivery systems, electronics, and sustainable materials. In each case, researchers can use the relationship between chain architecture and properties to guide material selection or design. The same chemical principles also apply across plastics, fibers, coatings, and biological macromolecules, making chain structure relevant to both manufactured and biological materials.
Understanding architecture helps researchers design materials rather than relying only on bulk behavior. By relating molecular weight, branching, cross-linking, and composition to flexibility, strength, solubility, and thermal stability, chemists can target performance requirements while also addressing sustainability. This knowledge supports the development of recyclable materials alongside high-performance polymers for applications such as packaging, electronics, and coatings.