Polypropylene, a versatile polymer used in textiles, packaging, and many other applications, offers several advantages. Its pros include resistance to moisture, chemicals, and abrasion, making it an excellent choice for containers and medical equipment. Additionally, it's lightweight, has a high melting point, and is recyclable, contributing to its eco-friendliness in some respects. However, polypropylene has cons as well. It's prone to UV degradation, requiring stabilizers when used outdoors. It can also be difficult to paint or bond without specific treatments and is derived from non-renewable fossil fuels, raising sustainability concerns.

Polyvinyl chloride (PVC) is a popular and versatile thermoplastic polymer widely used in construction, healthcare, electronics, and automotive industries, among others. The monomer unit that forms PVC is vinyl chloride (VC), which has the chemical formula C2H3Cl. The structure of the vinyl chloride monomer consists of two carbon atoms double-bonded to each other, with one carbon atom bonded to two hydrogen atoms and the other to a chlorine atom. This structure is what gives PVC its unique properties - durability, resistance to environmental degradation, and ability to be plasticized or softened with the addition of phthalates. In polymerization, multiple vinyl chloride monomers connect through the breaking of the double bond between the carbon atoms, forming long chains of PVC. The process of polymerizing VC into PVC can involve several methods, including suspension, emulsion, and bulk polymerization, each providing different characteristics to the final product.

To connect copper pipe to PVC, you will need a transition fitting that is suitable for both materials. One common approach involves using a push-fit fitting, designed for both copper and PVC pipes, offering a secure and watertight connection without the need for soldering or glue. Alternatively, you can use a copper to PVC adapter, which involves soldering the copper side of the adapter to the copper pipe and gluing the PVC side of the adapter to the PVC pipe using PVC cement. It's crucial to ensure that the pipe ends are clean and properly prepared before making connections. Always follow local plumbing codes and standards when performing any plumbing work.