Final answer:
PVC is difficult to bond using glue due to its chemical structure and properties. Heat or solvent welding methods are commonly used to join PVC instead.
Step-by-step explanation:
Polyvinyl chloride (PVC) is a widely used polymer in construction materials and other applications. Glue is not recommended for gluing PVC because PVC has a unique chemical structure that makes it difficult to bond with adhesives. PVC is a thermoplastic polymer, meaning it can be melted and reformed multiple times without degrading its properties. However, its low surface energy and high chemical resistance make it challenging for most adhesives to form strong bonds with PVC.
Instead of glue, PVC is typically joined using heat or solvent welding. Heat welding involves melting the PVC surfaces and pressing them together until they cool and solidify, creating a strong molecular bond. Solvent welding, on the other hand, uses a chemical solvent to dissolve the surfaces of the PVC, allowing them to fuse together when the solvent evaporates.
In summary, the unique chemical properties of PVC make it incompatible with most adhesives, which is why glue is not recommended for gluing PVC.