Contrast this to polyethylene which is more chemically resistant. A larger portion of ethene can be mixed in during the polymerization process to further improve the flexibility of PP. For instance, the superior clarity of LDPE makes it ideal for food packaging. Overall polyethylene is partially crystalline. Polyethylene consists of non polar, saturated, high molecular weight hydrocarbons. They also have high melting point and good dielectric properties and are non-toxic. As of 2018, the estimated global demand for PE products has reached 99.6 million tons, which is equivalent to a value of $164 billion. Experts forecast the global demand for propylene to reach up to 62 million tons by the year 2020, although this may still be heavily influenced by changing consumer attitudes. Although PP exhibits good resistance against most acids and bases, it easily degrades when exposed to various hydrocarbons and oxidizing agents. Two hydrogen atoms are bonded to each carbon. How are PP and PE different? • Polypropylene is not as sturdy as polyethylene. Terms of Use and Privacy Policy: Legal. PP becomes brittle at temperatures below -20 °C and starts to lose structural integrity at around 120 °C. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. One of the major uses of HDPE is in the manufacture of pipes and fittings for water supply, sewage, gas, and industrial applications. Little by little, viable alternatives are coming along. If the monomers have double bonds between carbons from addition reactions, polymers can be synthesized. It is an above-average insulator, making it a good component for electrical applications. What is Polyethylene (PET)? PP packaging is resistant to microbial growth but can also withstand steam sterilization, if needed. geomembranes and plastic sheeting to protect the environment to construction projects. HDPE tubes have also been used to protect electrical wires and telecommunication cables. • Polypropylene is stiffer and resistant to chemicals and organic solvents compared to polyethylene. The repeating units are called monomers. In the synthesis process, which is known as polymerization, longer polymer chains are obtained. Thus, PP copolymer is suitable for applications that require transparency and good visual appearance. What is the difference between Polyethylene and Polypropylene? @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } • Monomer of polyethylene is ethylene and monomer of polypropylene is propylene. Ethylene has two carbon atoms bonded to each other with a double bond. The most common method to create solid polypropylene is to pass propene over a fluidized bed made of solid catalysts, which then starts a chain-growth polymerization process. Aside from coal, modern methods have made it possible to extract ethylene from shale gas and biomaterials. Polyethylene is further broken down into weights or densities which is done so the plastic can serve a more specific purpose. The number of different variants of PE has certainly played a key role in its pervasiveness in so many industries and applications. Polyethylene is vastly used in packaging (plastic bags, Plastic films. They make up a considerable percentage in our garbage; therefore, they keep on increasing on the earth surface. As with many consumer plastics, the main reason for the widespread use of PP is that it’s very cheap to manufacture. Every day we have contact with PP or PE. Polypropylene is produced by a process called chain-growth polymerization from monomer propylene. Polymers are large molecules, which has the same structural unit repeating. Polyethylene and polypropylene are two of the most commonly used plastics in the world. What are you trying to do? The repeating units are called monomers. (There won’t be any spam. Applications of PE as packaging typically take advantage of the superior flexibility of the material, such as squeeze bottles, shrink wrap, and caps and closures. Examples include ice boxes, garbage bins, and small water tanks. There are two main types of polymers depending on their synthesis methods. Polyethylene is vastly used in packaging (plastic bags, New Address , Business Hours: 8:00 AM - 5 PM PST, fire retardant black plastic for haunted houses. The ease of working with PP makes it one of the most widely used materials for the internal and external parts of automobiles. Posted by They have a high resistance to cracking, acids, organic solvents and electrolytes. (To learn more, see. PP is one of the most preferred low-cost options for product packaging. on Mon, Nov 13, 2017 @ 02:13. It is not a matter of better- it's more a matter of- what is your application? There are a few parameters that are common across all types of PE. To understand why modern society is finding it so hard to move away from plastics, we need to look at why they are so useful. There are two main types of polymers depending on their synthesis methods. Higher crystallinity increases density and mechanical and chemical stability. Polyethylene is used in making bottles, bags, toys, etc. However, PP becomes more brittle at lower temperatures and it has poorer resistance to compressor oils than PE. The value of heat resistance also varies across HDPE and LDPE. It’s also a very flammable material. Polyethylene is further broken down into weights or densities which is done so the plastic can serve a more specific purpose. ready to have your mind expanded by the possibilities and taste a bit of the future before everyone else. Fabric woven from PP fibers is exceptionally strong and cheap, making it a prime option for storage and transportation of food products such as grain, fruits, and vegetables. Polypropylene vs. Polyethylene. Their molecular structure looks similar with carbons and hydrogen molecules- but then the differences arise. Polymers have very different physical and chemical properties than their monomers. Polymers are large molecules, which has the same structural unit repeating. All rights reserved. We get asked, which is better, polypropylene or polyethylene. I love diving into the latest and greatest in emerging technologies and seeing what they can do. This results in the production of polypropylene as a white powder, which is then melted and reformed into pellets for distribution. In the US alone, 7.3 billion pounds of propylene were produced back in 2017, which was a 7.7% increase from the previous year. In other words, polyethylene is produced by an addition reaction of the monomer ethylene. Plastics that compose commodity plastic are polystyrene, polyvinyl chloride. • Polyethylene has a lower melting point compared to the higher melting point of polypropylene. Both polyethylene and polypropylene are types of plastics, and they are polymers. Although plastics have become unpopular in the last few years (and for good reasons), there is no doubt that modern society is still very much dependent on them. LDPE has a much lower melting temperature with a range of 105 to 115 °C. While this can be desirable in some applications, it also means that it’s practically impossible to join PP components together using welding. This modification makes PP much more flexible and improves its optical properties. Main Difference – Polyethylene vs Polypropylene. From product packaging and common household items to automobiles and industrial facilities, it is clear that plastics are still everywhere despite a concerted to effort to develop more environment-friendly alternatives. In the US alone, 7.3 billion pounds of propylene were produced back in 2017, which was a 7.7% increase from the previous year. The categories of Polyethylene are as follows. Sometimes they can be straight chain, or sometimes they can be branched. Nonetheless, polypropylene has one of the highest chemical resistance ratings in the plastics category. Polyethylene and polypropylene have become a very controversial issue at the present day, due to their incapability of degradation. The density of polyethylene can vary from a low of 0.857 g/cm3 and to a maximum of 0.0975 gm/cm3. This is due to its excellent resistance to chemical degradation and moisture uptake. Although many plastics, including PE and PP, should ideally be recycled, the reality is far from this ideal vision. These polymers are known as addition polymers. Compared to PP, PE is more flexible than rigid, which gives it better ductility and impact strength. Due to the excellent tensile strength of HDPE, fibers made from HDPE are a prime choice to ropes and nets used for sports, fishing, and other agricultural uses. It is a thermoplastic that is second only to polyethylene in terms of the rate of global production. Its monomer is propylene, which has three carbons and one double bond between two of those carbon atoms. However, its strength is much lower than straight chain polyethylene. The physical properties of PE can be heavily influenced by the presence of branching groups in the polymer chain. These monomers are bonded to each other with covalent bonds to form a polymer.


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