What are cross-linking agents in polymers?
Cross-linking agents are added to novolacs to create bridges among the novolac polymers, i.e., the process of curing. Among them, the most common is hexamethylenetetramine (in short known as HEXA), which decomposes and reacts with a considerable rate from 150 °C and formally provides six methylenes per molecule.
What are examples of cross-linked polymers?
Examples of cross-linked polymers include: Polyester fiberglass, polyurethanes used as coatings, adhesives, vulcanized rubber, epoxy resins and many more.
What is the cross-linking of proteins?
Crosslinking is the process of chemically joining two or more molecules by a covalent bond. on proteins or other molecules. Attachment between two groups on a single protein results in intramolecular crosslinks that stabilize the protein tertiary or quaternary structure.
What are cross-linking agents?
Crosslinking Agents. Crosslinking is the formation of chemical links between molecular chains to form a three-dimensional network of connected. molecules. The vulcanization of rubber using elemental sulfur is an example of crosslinking, converting raw rubber from a weak plastic to a highly resilient elastomer.
What is cross linking what is the function of crosslinking?
– Cross linking is used to refer the process of linking one site to another site and provide a way to allow the accessing to it. – It doesn’t need to be owned by the same person as it provides the methods that have been be built on the Internet.
What are branched polymers?
Branched polymers are defined as having secondary polymer chains linked to a primary backbone, resulting in a variety of polymer architectures such as star, H-shaped, pom-pom, and comb-shaped polymers.
Is PVC a cross-linked polymer?
Crosslinking polymer chains is an important way of diversifying the physical and chemical proper- ties of polymers. In the case of poly(vinyl chloride) (PVC) resin, crosslinking technology also was investigated as a major tool of enhancing applicability.
What is antibody cross linking in immunology?
Term. What is antibody cross-linking? Definition. When the two arms of an Ig bind different cells, changing it to a T-shape, allowing for precipitation and agglutination.
What is cross linking immunology?
Crosslinking is the process of chemically joining two or more molecules by a covalent bond. Crosslinking reagents are used in a variety of techniques to assist in determining partners and domains of protein interactions, three-dimensional structures of proteins, and molecular associations in cell membranes.
Is PVC cross linked polymer?
What are the types of cross linking?
There are three different types of crosslinkers – homobifunctional, heterobifunctional, and photoreactive crosslinking reagents.
Why are cross linked polymers important?
Introduction. Chemical cross-linking has been widely used to alter the physical properties of polymeric materials, the vulcanization of rubber being a prototypic example. Linking of polymer chains through chemical linkages gives a material a more rigid structure and potentially a better-defined shape.
How is a cross linking agent activated in a polymer?
Crosslinking is the linking of two polymer chains by a cross-linking agent. The cross-linking agent is activated by time and temperature or by shearing at the drill bit. After setting, the pill produces a rubbery, ductile substance sealing the fracture and preventing further losses.
When do you use a crosslinking reagent?
Crosslinking reagents or crosslinkers are used to covalently bind two or more protein molecules to facilitate the identification of relationships between near-neighbor proteins, ligand-receptor interactions, three-dimensional protein structures, and molecular associations in cell membranes.
What is the purpose of protein cross linking?
Protein cross-linking is the process of binding two or more protein molecules together to facilitate scientific probes on protein-protein interactions.
Which is the best crosslinker for protein polymers?
Several plant-derived phenolic compounds, including tannic acid (CAS 1401-55-4), ferulic acid (CAS 1135-24-6), and gallic acid (CAS 149-91-7), can be used as crosslinkers for protein and polysaccharide polymers.