一. 课文 What are polymers? For one thing, they are complex and giant molecules and are different from low molecular weight compounds like, say, common salt. To contrast the difference, the molecular weight of common salt is only 58.5, while that of a polymer can be as high as several h...
Synthetic Polymers, commonly known as plastics, have been entering the marine environment in quantities paralleling their level of production over the last half century (Thompson). However, during the last decade of the 20Century, the deposition rate accelerated exponentially (Copello, Ogi). Thirty ...
HDPE bottles are sturdier than LDPE ones. 12 Polyester Any of numerous synthetic polymers produced chiefly by reaction of dicarboxylic acids with dihydric alcohols and used primarily as light, strong, weather-resistant resins in boat hulls, textile fibers, adhesives, and molded parts. 3 Polyethylene...
airborne microplastics that are present in the air we breathe, posing potential dangers to our health. Polyethylene (PE) Polypropylene (PP) Polyvinyl chloride (PVC) Polyvinyl chloride (PVC) is next in terms of the most common types of plastic and is famous for its ability to combine with othe...
"Polyester" is a synthetic polymer used in various textiles, while "Microfiber" is a fine synthetic fiber, often made from polyester.
根据第三段中的“The advantage of synthetic polymers lies largely in their excellent stability and various mechanical qualities.However,due to their high durability,waste materials made of these polymers have accumulated in the land and oceans,causing serious concerns for the ecosystem.”可推知,该段...
Because polyolefins are considered non-toxic, have extreme clarity and are recyclable, they are a popular and sustainable choice for bottle packaging. Polyolefins also make an excellent food-grade packaging material for container lids. Americhem can help meet your functional, aesthetic and cost target...
It is produced via chain-growth polymerization from the monomer propylene. Polyester Any of numerous synthetic polymers produced chiefly by reaction of dicarboxylic acids with dihydric alcohols and used primarily as light, strong, weather-resistant resins in boat hulls, textile fibers, adhesives, and ...
Are there environmental concerns associated with PVC? Yes, PVC contains chlorine, which can be problematic in waste management and recycling. 8 What is vinyl made from? Vinyl is made from synthetic polymers derived from ethylene. 7 How flexible is vinyl? Vinyl's flexibility can vary widely based...
Sources: Natural rubbers are sourced in Thailand, Indonesia, and Vietnam.29Synthetic rubber is derived from petroleum products (see above). Found in: Tires, belts, hoses, and seals. Rubber is essential for cars, and theauto industry. Tires are one of the most important parts of a car. ...