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 these atoms but weak Van der waals force (dipole-dipole force) between Polypropylene molecules. Isotactic Polypropylene forms a somewhat tetrahedral arrangement and its molecules are asymmetrical. These molecules form a long polymer chain. …show more content…
(n.d.). Retrieved April 16, 2016,from http://www.babygreenthumb .com/p-122-safe-plastic-numbers-guide.aspx Course Notes on the Interpretation of Infrared and Raman Spectra. (n.d.). Retrieved April 16, 2016, from https://books.google.com.sg/books?id=rX2ao fK_6LMC Polymers and their properties. (n.d.). Retrieved April 17, 2016, from http://www.slideshare.net/ ripestone_ho/polymers-and-their-properties INTERESTING facts about Isotactic Polypropylene Polypropylene is a versatile thermoplastic polymer. It can be moulded into different shapes and sizes and hence, can be put to many uses (material used to make chairs, containers, tools etc.) It is hard but flexible. (semi-rigid) It is lightweight! Polypropylene has a chemical formula of (C3H6)n. It is completely, 100% RECYCLABLE! Polypropylene has a code of 5 amongst the other types of plastics. It is one of the safer plastics! 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
In the first part of the experiment, Part A, the standard solutions were prepared. As a whole, the experiment was conducted by four people, however, for Part A, the group was split in two to prepare the two different solutions. Calibrations curves were created for the standard solutions of both Red 40 and Blue 1. Each solution was treated with a serial 2-fold dilution to gain different concentrations of each solution.
Covalent bonding - Covalent bonding is when two atoms share electrons this can only occur between two non-metals. They share electrons to fill up their outer shells, this makes the atoms stable. A Covalent bond can form up to one to three Covalent bonds with non-metals depending on how much electrons they possess. They don't always share electrons
Part I Which of the concepts in these chapters was the most difficult for you? In 5-7 sentences, explain what you think you understand and ask 2-3 questions about things you know you don 't understand. Standard error of the mean I read the section on standard error of the mean (SEM) three times and unfortunately, this concept is difficult for me to understand. I do understand that the standard error of the mean is the standard deviation of a sampling distribution of means. I understand how to calculate the SEM (simply divide the standard deviation of the sample by the square root of the sample size minus one).
Fiona Young Ha Hoang and Joey Lu 12/11/15 Malik AP Chem 4th Prepare to Dye Introduction Chromatography is the separation of a mixture or substance by putting it in a solute with chromatography paper. Following with this lab, we take 3 colors of food dye (red, yellow, and blue) and test which solvent out of distilled water, acetone, ethanol, and 2-propanal would separate the molecules in the dyes the best.
5. Public trials and executions serve as a deterance of deviant behaviors. These sanctions act as a way to set an example and for people to see what will happen to them if they do the same thing, These sanctions can also be seen as reinforcing boundaries. Although public executions and trials in “town square” are not as common in most countries today, the media is utilized to fulfil the same purpose. When there are high profile cases going on in the United States often tmes the full trial and sentancings are televised so that much of society can see what the repercussions are for defying a social norm.
Need To Repair Your Asphalt Driveway? How Resurfacing And Sealcoating Differ If your asphalt driveway is faded and showing its age, you may be wondering what you can do to bring it back to life. As long as the base under the driveway is still in good shape, you probably won 't need to tear out the old asphalt and install a new driveway. Depending on the degree of wear and tear, you can have a sealcoat applied or have the asphalt resurfaced.
Diels-Alder Reaction: Synthesis of 9, 10 dihydroanthraceno-9, 10-endo-α,β-succinic anhydride Introduction: For this experiment, a Diels-Alder reaction was performed. The concept of this reaction involves two compounds, one of which is an electron donating group and the other is an electron withdrawing group (Weldegirma). These two compounds are referred to as the diene and dienophile respectively (Weldegirma). The conditions for this reaction to take place generally require a fair amount of heat and the reaction is also stereoselective (Diels-Alder).
While glass is fully recyclable, plastic is not something we endlessly reuse. The triangle arrow that is on our plastic bottles is actually telling us the type of plastic it is made out of. There are a total of seven different plastics and only two of them, PET and HDPE, are recyclable. The author states, “only 3 to 5 percent of plastics are recycled in any way.” Products from jackets to carpeting is what more than half of our recycled plastic is used for.
The process of recycling plastic has several effects. According to "When Recycling is Bad for the Environment" by Rachel Cernansky, Cernansky points out that "There are so many types of plastics that sorting equipment can’t look for all possible additives in the materials passing through". Additives change the melting points of plastic of the same category. Consequently, it is impossible to melt and recycle plastic of the same kind together. In addition, any impurities left on plastic after washing can affect the strength and durability.
Despite of the huge advantages of made materials by using polymers, these actually are the real threats for environment as well as human health especially due to long decomposable nature of the polymers. 50 billion of waste water bottle generate every year in worldwide and expected to increase (Amit G et al., 2012). This is the major issue in many developing and under developing countries to recycle and reuse waste polymers. Besides, due to inefficient and high cost consuming projects, this avoids the process of recycle and reusing so lastly it becomes wastes and goes to landfills. Some will be burnt under uncontrolled conditions that could also lead to generation of many hazardous air
Most covers are made from polyurethane laminate (PUL), thermoplastic Polyurethane (TPU), wool, or fleece, because those fabrics are leak resistant. All-in-one diapers are a combination of pocket diapers and fitted diapers. They have a waterproof shell, fully absorbent insides, and include a pocket for extra absorbency as needed. All-in-one diapers are the closest to disposable diapers because they are all one piece, ready to put on without any added
The reason plastic is used in many products is because it can withstand up to tons of pressure per cm3, is cheap, is durable, and finally, there is no worry for discoloring. But these days, plastic is becoming a major problem the world has to deal with. Plastic is thrown into the ocean, and it is breaking down into very small pieces, and killing marine life, as they mistake those pieces to their prey. As a matter of fact, nearly all plastics are recyclable, but it 's the recycling companies ' machines that refuse to recycle that kind of plastic(eartheasy.com). I. Plastic, what have you done?
To illustrate the point, Solo Foods adds that when glass cookware experiences high temperature shifts, it can shatter violently (www.solofoods.com, 2013). Glass cookware is a simple source when baking, but isn’t always the best
It is easy to purchase the products that are made from recyclable materials, you can just simply refer to the recycling symbol and language on the products packaging. Everyday the manufacturers are thinking of how to make the products and packaging with recyclable materials. All these efforts should be appreciated because they all lead us to a better
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 and health problems.