There are limited kinds of constituent elements in organic materials, so the large number of organic compounds and their ever-changing complex properties depend more on the structure of functional groups in the material molecules. For example, hydroxyl in ethanol, carboxyl in carboxylic acid, amino and carboxyl in amino acid are the main structural factors that determine the basic properties of the above three compounds. Polymer Structural Analysis of Functional Groups https://functional-polymers.alfa-chemistry.com/services/structural-analysis-of-functional-groups.html
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