Here are the similarities and differences between PVC (Полівінілхлорид) і ПВДХ (Полівініліденхлорид):

Подібності:

1. Chemical Composition: Обидва ПВХ and PVDC are thermoplastic polymers that contain chlorine in their chemical structure.
2. Бар'єрні властивості: Both materials exhibit good barrier properties against moisture, кисень, та інші гази, making them suitable for packaging applications.
3. Прозорість: Both PVC and PVDC can be manufactured in transparent forms, allowing visibility of the packaged contents.
4. технологічність: Both materials can be easily processed through various techniques such as extrusion, підприємство для ін'єкцій, and calendaring.

Differences:

1. Chemical Structure: PVC is a vinyl polymer with a repeating unit of CH2=CHCl, while PVDC is a vinylidene chloride polymer with a repeating unit of CH2=CCl2.
2. Ефективність бар'єру: PVDC has superior barrier properties compared to PVC. PVDC films provide excellent moisture and gas barrier, offering better protection to sensitive products such as pharmaceuticals and perishable foods.
3. Термічна стабільність: PVDC has higher thermal stability than PVC. It can withstand higher temperatures without undergoing significant degradation.
4. Вартість: PVC is generally less expensive compared to PVDC, making it more widely used in various applications, including pipes, cables, and some packaging applications.
5. Вплив на навколишнє середовище: PVC has been associated with environmental concerns due to the release of chlorine and dioxins during production and disposal. PVDC is considered more environmentally friendly as it does not release chlorine or dioxins during its lifecycle.

It’s important to note that PVC and PVDC have different properties and are suited for different applications. PVDC is often used in high-barrier packaging applications where superior barrier properties are required, while PVC finds applications in a wide range of industries due to its versatility and cost-effectiveness.