Introduction of Polymer Science: Polymer science is the study of polymers, which are macromolecules composed of repeating units called monomers. Polymers are widely used in various applications, including plastics, fibers, coatings, adhesives, and many others. Polymer science involves the synthesis, characterization, and processing of polymers, as well as their physical and chemical properties.
Introduction of Polymer Science
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Classification
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Molecular Weight of Polymer
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Polymer Degradation
Polymer Morphology
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Classification of Monomer: Monomers can be classified into several categories based on their structure and properties. For example, monomers can be classified as:
- Ethylene derivatives: Monomers derived from ethylene, such as vinyl chloride, ethylene oxide, and styrene.
- Acrylic monomers: Monomers derived from acrylic acid, such as methyl methacrylate, acrylic acid, and acrylonitrile.
- Polyfunctional monomers: Monomers with more than one functional group, such as glycerol, pentaerythritol, and trimethylolpropane.
Classification of Polymerization: Polymerization can be classified into several categories based on the mechanism and reaction conditions. For example, polymerization can be classified as:
- Chain polymerization: A polymerization mechanism in which the polymer chain grows by the addition of monomer units to the active site of the growing chain.
- Step-growth polymerization: A polymerization mechanism in which the polymer chain grows by the reaction of functional groups on different molecules.
- Ring-opening polymerization: A polymerization mechanism in which cyclic monomers are opened to form linear polymers.
Molecular Weight: The molecular weight of a polymer is the sum of the atomic weights of all the atoms in the polymer molecule. However, since polymers are large and complex molecules, their molecular weight is usually expressed in terms of their relative molecular mass or weight average molecular weight. The molecular weight of a polymer can affect its physical and chemical properties, such as its strength, flexibility, and solubility. The molecular weight can be measured by several methods, such as gel permeation chromatography and mass spectroscopy.
