POLYVINYLIDENE CHLORIDE Meaning and
Definition
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Polyvinylidene chloride refers to a synthetic polymer that is composed of repeating units of vinylidene chloride. Also known as PVDC, it is a transparent, colorless, and thermoplastic polymer with excellent barrier properties against moisture, oxygen, and chemicals. The chemical formula for polyvinylidene chloride is (CH2CCl2)n.
PVDC is primarily used as a coating or film for various packaging applications, such as food wrap, shrink film, and blister packaging. Its exceptional barrier characteristics make it ideal for preserving the freshness and quality of products by preventing the entry of external elements that could cause spoilage. This polymer effectively inhibits the transfer of moisture vapor, gases, and odors, thereby extending the shelf life of food and other perishable goods.
In addition to its barrier properties, polyvinylidene chloride also possesses desirable heat-sealing and mechanical properties, making it suitable for numerous industries. Its ability to resist chemicals, oils, and greases further enhances its applicability in chemical storage containers, ductwork insulation, electrical wire insulation, and protective coatings. Moreover, PVDC is resistant to ultraviolet light, ensuring durability and stability in outdoor applications.
However, it is important to note that due to its non-biodegradable nature and potential release of harmful emissions under certain conditions, there are increasing concerns about the environmental impact of polyvinylidene chloride. Consequently, research and development efforts are underway to explore more sustainable and eco-friendly alternatives for various PVDC applications.
Etymology of POLYVINYLIDENE CHLORIDE
The etymology of the word "polyvinylidene chloride" is as follows:
1. Poly-: A prefix derived from Greek, meaning "many" or "much". It is commonly used in chemistry to indicate the polymerization of a compound.
2. Vinyl: Derived from the Latin word "vīnum", meaning "wine". In chemistry, it refers to an organic compound that contains a vinyl group (CH2=CH-), which is characterized by a double bond between two carbon atoms.
3. -idene: A suffix derived from Greek, indicating the presence of a double bond between carbon atoms in an organic compound.
4. Chloride: Derived from the Greek word "chlōros", meaning "greenish-yellow". It refers to a compound containing the element chlorine (Cl-), which is a halogen.
