Polypropylene Essays

The two polyesters produced in the first part of this experiment are a linear structured polyester with thermoplastic properties, and a cross-linked polyester with thermosetting properties. The linear polyester was produced from the reaction of phthalic anhydride with ethylene glycol. Due to the fact that both of these components have only two functional groups, the polymer chain is linear. As shown in Picture 1 above, the product formed from the reaction is a solid and resulted in a dark color change

crystalline (in g/cm^3) C: List 2 things commonly made with it. D: CALCULATE the molecular weight of polypropylene (g/mol) Answer: The plastic relating to the monomer structure above is Polypropylene. (PP) Polypropylene is one of the lower density fibers. The density for amorphous is 0.855 g/cm^3 and the density for crystalline is 0.946 g/cm^3. Polypropylene usually polymerizes by addition. Polypropylene is most commonly used to make car batteries, carpet, and food containers. Because of polypropylene’s

Chemical Structure of Isotactic Polypropylene Isotactic Polypropylene has a simple molecular structure. It contains a carbon ‘backbone’ chain whereby carbon is bonded to carbon atoms in a polymer chain, carbon is bonded to hydrogen atoms and methyl groups. (CH3). All the methyl groups are positioned on the same side of the chain, resulting in a regular and uniform structure of polymer. Polypropylene forms the head to tail structure through polymerization. There is strong covalent bonds between

Loubani1 Reem Loubani Mrs. Dina Daher Chemistry Sunday December 25th, 2016 Plastic Synthesis Polymers are large molecules composed of smaller molecules called monomers. Polymers are found almost everywhere around you. Some of them are naturally occurring, such as proteins, starch, silk, and wool, while others, such as nylon, Teflon, and plastics, are synthesized in labs to yield important products. Plastic is a material widely known by people; it is used in an enormous range of products

NJ) containing sodium citrate anticoagulant and centrifuged at room temperature for 20 minutes at 1,500g. The top layer, corresponding to diluted plasma, was decanted using sterile transfer pipettes and immediately frozen and stored at 80°C in polypropylene cryopreservation vials (Nalge Nunc, Rochester, NY). For quantitative measurements of serum and plasma uPA, uPAR, and plasminogen activator inhibitor type 2 (PAI-2) levels,weused specific quantitative sandwich enzyme immunoassays (American Diagnostica

Fv1, Fv2 and Fv3 Are forces caused by varus and Fs1, Fs2 and Fs3 are forces caused by foot drop. Ankle foot orthosis is made to wear in shoe to provide binding foot with orthoses the same task has band on shank. Material for orthosis is polypropylene Polypropylene is durable and the strongest thermoplastic available for making orthosis, on prominent bone spots can be placed the prelate foam to prevent the skin abrasion and irritation (Showers & Strunck, n.d.). b) Orthosis for post-poliomyelitis patients

Devi et al. (2012) discused two types of modified cups used to assist an infant with CP in the feeding process. The Baby Cup Feeder is a small, 40 ml polypropylene cup, with markings along the side for both ounces and milliliters (Devi et al., 2012). The Soft Feeder is another modified feeding device that is made up of a soft silicone reservoir, and is able to contain the fluid unlike regular cups (Devi et al., 2012). Ize-Iyamu and Saheeb (2011) observed a decrease in spill and regurgitation when

Several years ago microbeads, which are tiny pieces of plastic, no bigger than the head of a pin, began appearing in soaps, facial cleansers, toothpastes and many other body care products. Cleansers with microbeads soared in popularity after manufacturers touted their exfoliating effects, but recently, the environmental impact of these non-biodegradable beads has sparked concern. Microbeads are so small that sewage treatment plants do not have the capability to filter them out completely before

Fitness Bootcamp – What To Wear At Your Winter Bootcamp Classes Even in the winter your fitness bootcamp sessions will be taking place outdoors. Therefore it is vital that when attending any of your sessions that you wear clothing that is appropriate for this time of the year. It is only about wearing the right kind of clothing it is also about how you dress too ensure that you remain healthy when you are exercising when the weather turns colder or wetter. In this article we offer a few

HERNIA Introduction Hernia is an abnormal protrusion of internal organs through an abnormal opening in the wall of the cavity.A combination of increased pressure inside the body with weakness in the wall is responsible for this condition.In this condition internal organs or parts of organs are protruded out forming a swelling which will increase the size with coughing and lifting weight,and while passing stool and urine.In lying down position the swelling goes inside except in strangulated and

Background research South Africa is currently faced with a major energy crisis, whereby there have been power cuts throughout the country. People that stay in shacks are then faced with the challenge of keeping warm throughout winter. They are then forced to use paraffin lamps, gas heaters and candles. The use of these to keep shacks warm is often dangerous as they can result in terrible tragedies like a family losing their home. During these fires a bigger tragedy is that other shacks closely surrounded

In 2015 the SAT scores where the lowest grades in ten years. Honestly without the big SAT and PARCC testing, the world would be much easier. It would be less nerve racking. For instance, it would be more humane for the children. If the test scores are low, gives children stress, and the testing is inhumane, especially why are the poor little children, and teachers taking the test? No one needs to go through the situation of taking the SAT’s or any test. One reason why children should not be taking

The huge amounts of plastic thrown away every year are enough to circle the world four times. According to Oxford dictionary plastic is “ a synthetic material made from a wide range of organic polymers that can be formed into shape while soft, and then set into inflexible or slightly flexible form”. It was invented by John Wesley Hayatt in 1869. Today, almost 260 million tons of plastic is produced a year. Plastic does not decompose and it stays on the surface for decades, which led to environment

Forty male albino rats (120–150 g) were purchased from AL-Zyade Experimental Animals Production Center, Giza, Egypt. Rats were housed in polypropylene cages with mesh wire covering at 22-25°C with 60-65% relative humidity and under a 12-hr light/dark cycle. Clean food and water were provided ad libitium. After 2 weeks of acclimatization, the rats were randomly divided into four groups, each group had 10 animals as the following; group 1: control group fed with free basal diet, group 2: fed with basal

Introduction Varicocele is characterized by an abnormal dilation of the testicular veins in the pampiniform plexus. The inci-dence of varicocele in the general adult population is about 15–20%, and it can be considered a major cause of male infertility. It may occur by a number of different mechanisms, and is thus considered to be a multifactorial disease [1]. The exact mechanism of impaired testicular function in patients with varicocele has not yet been determined. Elevated testicular and scrotal

For many year people have used outdated protective gear for sports, for as long as anyone can remember and as far back as any book has gone, there has been protective equipment. Many years ago in Ancient Egypt, the Pharaoh of Egypt would wear protective gear so nobody could assassinate him. Now, in almost every sport professional and youth athletes are wearing protective equipment. There are classes in colleges and universities the teach sports safety and what protective gear should be worn, and

It was previously mentioned that the focus of this study is to use ceria-zirconia (CeO2-ZrO2) as the catalyst support. The approach of A. Poyraz et al. [7] to synthesize varying ratios of CeO2-ZrO2 mesoporous materials was modified and used. The modifications were the following: (a) zirconium (IV) oxynitrate hydrate was used instead of zirconium (IV) butoxide; (b) application of the method for the synthesis of CeO2-ZrO2 solid solution; and (c) physical separation of solids (filtration instead of

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

serious problems in pressure-driven membrane processes is less significant[11]. The membranes in MD process are required to have hydrophobic properties i.e. low surface energies. In most studies, commercial porous hydrophobic membranes including polypropylene, polyvinylidene fluoride (PVDF), and

Strategy and objective of the company: Brambles (CHEP) remain focused on their targets that were set in December 2013 so that they can deliver annual percentage growth in sales revenue in the high single digits at constant currency, and return on capital invested of 20% by FY19. However because of the size of investment opportunity in their current business is bigger than what they expected when they set those objectives, they now envision average annual growth in average capital invested before