Linear Polymers
Linear Polymers - 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...
06:35
Linearization of the Bradford Protein Assay
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Cited by 292 •
2010
The accuracy and sensitivity of protein determination by the rapid and convenient Bradford assay is compromised by intrinsic nonlinearity. We show a simple linearization procedure that greatly increases the accuracy, improves the sensitivity of the assay about 10-fold, and significantly reduces interference by detergents.
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
These are two routes for joining monomers through covalent bonds, and the selected route contributes to the resulting chain structure. Along with reaction conditions, polymerization mode affects chain length and molecular weight. Comparing the routes helps chemists relate synthesis choices to structural features such as crystallinity and entanglement, which influence strength, flexibility, melting behavior, and solubility.
Monomer functionality influences how many connections a monomer can make during polymerization. That connectivity affects whether the product develops extended chains and helps determine chain length and molecular weight. In chemistry, considering functionality alongside reaction conditions allows researchers to anticipate structural differences that can change the polymer’s physical behavior and suitability for a specific material application.
Crystallinity and entanglement are structural features that help determine how a polymer behaves. Their presence and extent are associated with changes in strength, flexibility, melting behavior, and solubility. This structure-property relationship explains why two materials formed from repeating monomer units can perform differently and why controlling molecular organization matters when designing plastics, fibers, films, or coatings.
A synthesis plan should account for the monomer’s functionality, the chosen polymerization route, and the reaction conditions. These factors influence chain length, molecular weight, crystallinity, and entanglement. After selecting suitable conditions, chemists can relate the resulting structural features to desired properties such as flexibility, strength, melting behavior, or solubility rather than treating composition alone as the design variable.
Useful comparisons include chain length, molecular weight, crystallinity, and the degree of chain entanglement. These characteristics provide a framework for interpreting differences in strength, flexibility, melting behavior, and solubility. Examining them together gives chemistry researchers a clearer connection between how a polymer formed and how it may perform as a plastic, fiber, film, coating, or laboratory material.
They are selected when extended chains can provide properties suited to a particular use. Depending on their structure, these materials can serve as plastics, fibers, films, coatings, or laboratory materials. Their importance in chemistry extends beyond synthesis because researchers use structure-property relationships to tailor performance and support the development of materials with improved recyclability.