Plastic generation

Group of plastics generated by the condensation of amines (e.g., urea and melamine with aldehydes). 

In the early 1970s, environmental concerns about the disposal of plastics generated considerable interest in the development of degradable materials.37 This concern... 

Thayer A (1990) Degradable plastics generate contreversy in solid waste issues. Chemical and Engineering News 68 7-24... 

PROPERTIES OF SPECIAL INTEREST Weak acid, brittle solid that cannot be molded, crosslink on heating, decomposes without softening at high temperature, too water sensitive to be plastics, generation of viscosity and thixotropy at low concentrations, interaction with counter-ions or charged particulate matter, inverse solubility-temperature behavior. 

Most aromatic polyamides cannot be made by a melt polymerization process because the polymer melt temperature exceeds the decomposition temperature. Singh developed a unique procedure for preparing certain aromatic polyamides by a melt process using an internal plasticizer generated in-situ during the polymerization [82]. The following reaction scheme was used to prepare aromatic polyamides in the absence of a solvent (Equation 13.24). 

An indication of the plastic generation and recycling rates which can be achieved for the six primary types of plastic are shown in Table 2.10. It shows estimates of generation rates for different types of plastics collection developed from curbside pickup programs and from plastic recycling projection studies. The source of the data is listed along with the calculated per household rates. 

Table 2.10 Estimates of Plastics Generation and Supponing Background Data... 

Table 2.10 Estimaies of Plastics Generation and Supporting Background Data (Cbntinued)... 

Figure 12.8 Plastics generated and recycled in the United States, 1966, by resin type.2...

Although the portion of plastics recovered by recycling in the United States is relatively small—1.34 million tons, or 5.4% of plastics generation in 2000— recovery of certain plastics has been increasing (2). Recently, 40% of discarded PET soft drink bottles and 31.9% of HDPE milk and water bottles were recovered (2). In... 

In addition to residential post-consumer plastic available f -recycling, per capita estimates of post-consumer plastic generated in the food sovice industry and the commercial sector (aside from food service) have been estimated (Table 2.11). The estimates shown were made using a combination of manufacturing data, measurements from actual recycling programs, and measurements from excavations of landfills from intercepted MSW [CNT, 1990]. The table shows that HOPE, PS and LX)PE comprise a majority of the plastic available for recycling in the U.S. from the commercial and food service sectors. 

P.7.4 According to Table 7.11, which of the following plastics generated the most solid waste during the production of the plastic pellets ... 

It is very difficult to compare the amounts of waste plastics generated in different countries. The methodologies used to obtain the statistics are different and dates of publications vary. The Organization for Economic Cooperation and Development (OECD) consists of Austria, Australia, Belgium, Canada, Denmark, Finland, France, Germany, Italy, Japan, the Netherlands, New Zealand, Norway, Spain, Sweden, Switzerland, Turkiye and the United States. OECD countries produced a total of 420 millions tons of municipal waste per year ( late 80s ),[3]. If one assumes that 8% of that waste is plastic the total amount of plastics in the municipal solid waste is 34 million tons. If that material was worth only 0.10 per kilogram, the total value would be around 3.4 billion. 

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