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Recent Developments in Gas Barrier Polymer Nanocomposite Coatings
Published in Mangala Joshi, Nanotechnology in Textiles, 2020
A comparison of the gas permeability of different gases through different polymeric films has been highlighted in Table 19.1. Currently, polyvinylidene chloride (PVDC, Saran®), ethylene vinyl alcohol copolymer (EVOH), and biaxially oriented polyester (BoPET, Mylar®) are extensively used in different gas barrier applications. However, the gas barrier properties of common polymers that are extensively used in coatings, like polyurethane (PU), polymethyl methacrylate (PMMA), polyaniline (PANI), and rubber, need to be improved for gas barrier applications. Therefore, nanocomposites of these polymers are becoming popular for making gas barrier films or coatings.
Extrusion of Oriented LCP Film and Tubing
Published in Robert R. Luise, of High Temperature Polymers, 1997
High-barrier film users are currently looking for alternatives to polyvinylidene chloride as a barrier layer because of problems cited in burning PVDC. LCP laminates and coextruded films are being evaluated because evidence suggests they can be burned as easily as PET, and their high-barrier properties mean that LCP layers will be four to five times thinner than PVDC for equivalent barrier performance.
Benefits of Nanocomposite Food Packaging Over Conventional Packaging
Published in Shiji Mathew, E.K. Radhakrishnan, Nano-Innovations in Food Packaging, 2023
It is an addition polymer of polyvinylidene chloride (PVDC) with its major advantage being the oxygen and moisture barrier. They have good clarity and oil resistance. It is heat sealable with its application in poultry, cured meat, cheese, coffee, tea, and confectionery.
Assessment of waste plastic oil blends on performance, combustion and emission parameters in direct injection compression ignition engine
Published in International Journal of Ambient Energy, 2019
Hariram Venkatesan, Seralathan Sivamani, Kunal Bhutoria, Harsh H. Vora
Since 1960, the usage of plastic in various forms have been increasing due to its low susceptibility to chemical reaction, reduced weight, corrosion resistance, reusability and being relatively less costly and contamination free. Some commonly used plastic materials in engineering applications are polyester, polyethylene terephthalate, polyvinyl chloride, high-density polyethylene (HDPE), polyethylene, polyvinylidene chloride, low-density polyethylene (LDPE), polypropylene, polystyrene, high impact polystyrene, polyamides, polycarbonates and polyurethanes. Few special purpose plastics like maleimide, melamine formaldehyde, phenolics, polyetherimide, polytetrafluroethylene and many more find applications in composite materials, electric insulations and high temperature areas (Agarwal 2007; Ashraful et al. 2014; Devaraj, Robinson, and Ganapathi 2015; Passamonti and Sedran 2012). Increased use of plastics in the field of engineering resulted in enormous accumulation of waste plastic as solid waste which led to the concern of environmental degradation and soil pollution to a great extent. LDPE and HDPE plastics generally contain cadmium and lead as main additives which are toxic in nature. Carry bags and packaging films made out of substandard plastics also creates problems in recycling as well as its collection. Care must be taken during source segregation of plastics to avoid the above issues in handling the plastic waste. In order to overcome the environmental hazards by plastics, the waste plastics need to be treated through mechanical process, sweltering or thermal/catalytic cracking.