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Polypropylene, a versatile thermoplastic polymer widely used in packaging, textiles, automotive parts, and various household applications, has a relatively simple chemical structure. Its formula can be represented as (C3H6)n, where 'n' represents the number of repeating units in the polymer chain. This structure arises from the polymerization of propylene (or propene), which is a monomer with the formula C3H6. In this process, multiple propylene molecules link together through a chain-growth polymerization mechanism, forming long molecular chains of polypropylene. The structure of polypropylene allows for various arrangements of the methyl group (CH3) attached to the carbon backbone, leading to different polymer "tactics" (isotactic, atactic, and syndiotactic) which influence the material's properties such as crystallinity, melting point, and strength.

To remove pine pitch sap from a polypropylene shirt, first place the garment in the freezer for a couple of hours. This step hardens the sap, making it easier to scrape off with a dull knife or spoon. Be gentle to avoid damaging the fabric. After removing as much sap as possible, apply a small amount of rubbing alcohol or a commercial stain remover designed for grease and oil on a clean cloth, and gently dab the stained area. Do not rub, as this may spread the sap deeper into the fabric. Once the sap has been treated, wash the shirt according to its care instructions, preferably separately to avoid contaminating other clothes. Avoid using heat (hot water or dryer) until the sap is completely gone, as heat can set the stain permanently.