For interior and automotive design, polyvinyl acetate is used in
adhesives and latex paints. Fiber products such as indoor-outdoor carpeting, textiles, car and truck parts, packaging, and toys can all be made from polypropylene. Other commercial applications of chain-growth polymers include break resistant containers (polyethylene), glass substitutes (polymethyl methacrylate), synthetic rubber (isoprene rubber), and CDs/DVDsPolymethyl methacrylate, or Plexiglas and Lucite are very popular glass substitutes for objects that must be transparent and durable. Glasses and contacts are pristine examples of the practical application of these polymers.
Since the 1970’s and 1980’s, contacts have been made of 2-hydroxyethylmethacrylate (PHEMA) and glasses lenses made of polymethylmethacrylate (PMMA). In this case, both methylacrylates are a form of hydrogels created during ester exchange in ethane-1,2 diol and methyl methacrylate reactions. For contacts, both HEMA and EGDMA are co-polymerized to yield the polymer with the desired gel properties contingent if it is synthesized in physiological saline or teteraethyleneglycol dimethacrylate (TEGDMA). The “gel network” of PHEMA is responsible for retaining the shape and optical properties found in contact lenses.
High hydration from the hydrogen bonding sites for water is what allows higher compatibility in user’s eye as the contact is more permeable to oxygen. However, this high hydration comes at a price. Proteins in the eye can become trapped in the gel, causing cleaning/sterilization issues and dyes can also b...
... middle of paper ...
...g good to plastic bags, the results varied depending on the energy source. The results showed a 69% higher production impact was absorbed when U.S.
electricity mix was used to make bio bags, and production impact for bio bag was five times greater when coal-fired power supply was used. According to the research, “when natural gas was used, the production impact was comparable, and when clean and renewable energy (geothermal) was used the research shows the bio-bags are 80% more environmentally friendly.” The diagram below describes the life cycle of polypropylene plastic bag, made out of crude oil, and bioplastic from renewable resources such as crops.Although, bioplastic is preferred over petroleum-based polymers, the amount of energy used in the lifecycle process, causes some concerns. Looking at the life cycle gives some insight to where the actual problem occurs
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