>Physical, chemical properties The high density polyethylene is a thermoplastic resin. At room temperature the density is between 0,94 and 0,96 g/cm³, about 60 % is crystalline the remaining is amorphous. Between 125° - 135° C, polyethylene melts and the viscosity is molecular weight dependent. The melt density drops to 0,80 g/cm³. The polyethylene resists to the most chemical products and solvents.
To be as thorough as possible, the two most widely used plastics in production were focused upon: High and Low density polyethylene. The study also includes extensive literature review on the possible methods for the biodegradation of the High-Density Polyethylene (HDPE) and Low Density Polyethylene (LDPE) using various sources like using bacteria, fungi, and some genetically engineered bacterial
INTRODUCTION Figure 1: Molecular Structure of PET PET (or PETE) is also known as polyethylene terephthalate or (C10H8O4)n. Its natural state is a colorless, semi-crystalline resin when combined with other materials like glass fiber or carbon nanotubes, it increases the material’s strength. Polyethylene terephthalate melts at 260°C and Amorphous density (at 25oC) is 1.33 g/cm3. PET can be produced by 2 different reactions as a product of polymerization. The first reaction is between ethylene glycol with terephthalic acid. The second one is the reaction of ethylene glycol with dimethyl terephthalate in acid catalyst.
They are microwavable! Polypropylene is also dishwasher safe! It has softening region of about 150 °C and a melting point of 160-170 °C. It is resistant to most acids and alkalines as well as organic solvents It has a good chemical and heat resistance compared to other plastics. It is a non-conductor of
PET polyester fibres are produced commonly in round crosssection, but fibres of special cross-section are now available from a number of manufacturers. PET polyester fibres are thermoplastic, and lend themselves well to physical modificationc associated with this property. Crimped and textured yarns of all familiar types are available. Production: Polyethylene terephthalate is made by the condensation of terephthalic acid, or a derivative such as dimethyl terephthalate, with ethylene glycol. Reaction a.
Synthetic molecules Student: Omar Moghrabi Section: 9A Teacher: Bader Al Saidi introduction: Many products in our everyday lives, such as plastic containers and bags, to medicine tablets, and even water bottles have one thing in common, and that is because they are all mad of synthetic molecules / chemicals. These chemicals play a huge role in our community because people really rely on the products that are made by them for storage, medicinal problems, cleaning, and working. One of the various types of synthetic molecules is low-density polyethylene (or LDPE for short) is used for making trays, plastics, bottles etc. This essay will talk about low-density polyethylene and the synthetic molecules in general, discussing there advantages
"Synthetic organic polymers are human-made polymers with various main chain and side chain compositions" ("Types of Synthetic Organic Polymers"). Synthetic polymers are typically found in consumer products. One of the seven most common synthetic organic polymers is polypropylene (PP). Polypropylene, also known as polypropene, is a thermoplastic polymer, meaning it is pliable and moldable above a specific temperature, and is a solid at room temperature ("Types of Synthetic Organic Polymers"). Polypropylene is very versatile and can serve as either a plastic or a fiber.
As noted before Linear low density polyethylene (LLDPE) is used for water storage tank manufacturing. The Linear low density polyethylene used for this process is a food grade material. We cannot use raw Linear low density polyethylene for this manufacturing process. This material should be processed withstand various conditions such as sharp sunlight. This Polyethylene material should not react or mix with water while using the tank for storing water.
List of synthetic rubber types-What is synthetic rubber? What is Synthetic Rubber? Certain chemicals are added in native form of rubber it is called synthetic rubber.It is used in making different products as a substitute of natural rubber. The use of bicycles expanded in the1890s, and particularly their tires.This started increased demand for rubber. In the history rubber prices and worth started to enhance by 1925 the price of natural rubber.This increament was as fast that many companies started to produce synthetic rubber to compete with natural rubber.
Review of Literature Synthetic fibers nowadays are manufactured using polymer-based petrochemical materials. Large amounts of crude oil, coal or natural gas are used in the process. It releases emissions which includes volatile organic compounds (VOC), particulate matter, and acid gases such as hydrogen chloride causing respiratory problems. Waste water from manufacturing plants contains the toxic pollutants and thereafter pollutes our waterways, killing marine animals and disturbing the entire aquatic eco-system. Synthetic and natural fabrics can have synthetic dyes and other harmful chemicals added to make the fabric softer, more colorful, crease-free, fire-resistant, water-resistant, stain-resistant, soil-resistant and moth-repellent.