different types of polymers and their uses
Different types of polymers and their uses Definition
Polydicyclopentadiene - Polydicyclopentadiene (PDCPD) is a relatively new polymer which is formed through Ring opening metathesis polymerisation (ROMP) of Dicyclopentadiene (DCPD). The difference between the various systems lies in the type of catalyst used to create the polymer, but the final polymer properties..
Polymer concrete - Polymer concrete is part of group of concretes that use polymers to supplement or replace cement as a binder. The types include polymer-impregnated concrete, polymer concrete, and polymer-Portland-cement concrete. Polymers in concrete have been overseen by ACI Committee 548 since 1971. Polymer concrete..
Polymer concrete - Polymer concrete is part of group of concretes that use polymers to supplement or replace cement as a binder. The types include polymer-impregnated concrete, polymer concrete, and polymer-Portland-cement concrete. Polymers in concrete have been overseen by ACI Committee 548 since 1971...
Resin identification code - The SPI resin identification coding system is a set of symbols placed on plastics to identify the polymer type. It was developed by the Society of the Plastics Industry (SPI) in 1988, and used internationally. Most plastics can be recycled, but they have to be separated into their different..
Polyethylene - Polyethylene, (IUPAC name polyethene), is a thermoplastic commodity heavily used in consumer products (over 60 million tons are produced worldwide every year). See also: Matter & Energy Materials Science Inorganic Chemistry Chemistry Electronics It is a polymer consisting of long chains of the monomer ethylene (IUPAC name ethene). In the polymer industry the name is sometimes shortened to PE, in a manner similar to that by which other polymers like polypropylene and polystyrene are shortened to PP and PS, respectively. In the United Kingdom the polymer is called polythene. Polyethylene is created through polymerization of ethene. It can be produced through radical polymerization, anionic addition polymerization, ion coordination polymerization or cationic addition polymerization. This is because ethene does not have any substituent groups which influence the stability of the propagation head of the polymer. Each of these methods results in a different type of polyethylene.. For more in....
"Different types of polymers and their uses" Videos
Nanotechnology and the running shoe Running shoes are designed to absorb energy, to make them comfortable and protect your feet. To do this they have to be soft and squishy, but if you walked on a soft material it would flatten out, getting deader and deader as you went through the day. To stop this, we need to add hard bits to the formulation. These prevent the shape squishing too far, and allow it to rebound after each step. As a result, the running shoe stays in shape. The nanotechnology comes in because the soft and the hard bits we use are the size of polymer molecules. The core of the running shoe is a polymer foam, blown by a gas generated when the polymer is made. In a simple polymer for running shoes, two different types of molecule - of different sizes and stiffness - might be used. Combining them in the correct ratio gives a sole that absorbs energy and recovers it's shape, after it has been compressed. This is one of a selection of intriguing movies which are available for free download from the EPSRC Nanotec..
Economy Polymers Acid Test Contrast the difference between commmonly used acid chemicals and those offered by Economy Polymers
Different types of polymers and their uses Questions & Answers
Question : PLA - polylactic acid
it is a biodegradable polymer used as a substitute for petroleum based plactics.
Answer : There are several suppliers that will provide you with PLA of various sorts (different chemical end-groups, different average mol. wt, etc.), as well as related polymers like PLGA. We get ours from Boehringer Ingelheim: http://www.boehringer-ingelheim.com/corporate/home/home.asp But Wako: http://www.wako-chemicals.de/ and Lactel: http://www.absorbables.com/ also produce them. You'll need to ask them for quotes, but some might also give free samples. IIRC, we paid 1,177 for 5x50g of different PLGA types. You may have to produce pellets of them yourself, if you require a pellet form, as we get the PLGA as a powder. If you are making microparticles - read up on coacervation, and spray-drying as techniques for microparticle production.
Answer : There are several suppliers that will provide you with PLA of various sorts (different chemical end-groups, different average mol. wt, etc.), as well as related polymers like PLGA. We get ours from Boehringer Ingelheim: http://www.boehringer-ingelheim.com/corporate/home/home.asp But Wako: http://www.wako-chemicals.de/ and Lactel: http://www.absorbables.com/ also produce them. You'll need to ask them for quotes, but some might also give free samples. IIRC, we paid 1,177 for 5x50g of different PLGA types. You may have to produce pellets of them yourself, if you require a pellet form, as we get the PLGA as a powder. If you are making microparticles - read up on coacervation, and spray-drying as techniques for microparticle production.
Question : need to know what polymers are.maybe some examples and the main types of polymers.... in FOOD... maybe give some examples and main polymers...in FOOD...
Answer : A polymer is a very large organic molecule made up from many smaller molecules joined together. The small molecules are known as monomers and most polymers are made up of one or two different types of monomer. Polythene The first commercially produced polymer is also the simplest and most common: polythene. Its systematic name is poly(ethene) meaning it is a polymer made from the monomer, ethene. Ethene is a small molecule containing two carbon atoms linked by a double bond and four hydrogen atoms, two bonded to each carbon. Free Electrons When ethene is subjected to high temperature and pressure, or reacted in the presence of a catalyst, one of the bonds in the double bond is broken. Each of the carbon atoms then has a free electron which can form a covalent bond by pairing with another free electron. If other ethene molecules are present, the double bond in one of them can break, and the free electron on one of the carbons can combine with another on the original molecule..
Answer : A polymer is a very large organic molecule made up from many smaller molecules joined together. The small molecules are known as monomers and most polymers are made up of one or two different types of monomer. Polythene The first commercially produced polymer is also the simplest and most common: polythene. Its systematic name is poly(ethene) meaning it is a polymer made from the monomer, ethene. Ethene is a small molecule containing two carbon atoms linked by a double bond and four hydrogen atoms, two bonded to each carbon. Free Electrons When ethene is subjected to high temperature and pressure, or reacted in the presence of a catalyst, one of the bonds in the double bond is broken. Each of the carbon atoms then has a free electron which can form a covalent bond by pairing with another free electron. If other ethene molecules are present, the double bond in one of them can break, and the free electron on one of the carbons can combine with another on the original molecule..
Question : A company recieves two batches of the same polymers. When tested these were found to have the same chemistry and structure but considerably different mechanical properties. Suggest one possible reason.
Answer : Polymer is a term used to describe large molecules consisting of repeating structural units, or monomers, connected by covalent chemical bonds. The term is derived from the Greek words: polys meaning many, and meros meaning parts [1]. A key feature that distinguishes polymers from other molecules is the repetition of many identical, similar, or complementary molecular subunits in these chains. These subunits, the monomers, are small molecules of low-to-moderate molecular mass, and are linked to each other during a chemical reaction called polymerization. Similar monomers can have various chemical substituents. These differences between monomers can affect properties such as solubility, flexibility, and strength. In proteins, these differences give the polymer the ability to adopt a biologically-active conformation. (See self-assembly.) Identical monomers with nonreactive side groups result in a polymer chain that will tend to adopt a random coil conformation, as described by an idea..
Answer : Polymer is a term used to describe large molecules consisting of repeating structural units, or monomers, connected by covalent chemical bonds. The term is derived from the Greek words: polys meaning many, and meros meaning parts [1]. A key feature that distinguishes polymers from other molecules is the repetition of many identical, similar, or complementary molecular subunits in these chains. These subunits, the monomers, are small molecules of low-to-moderate molecular mass, and are linked to each other during a chemical reaction called polymerization. Similar monomers can have various chemical substituents. These differences between monomers can affect properties such as solubility, flexibility, and strength. In proteins, these differences give the polymer the ability to adopt a biologically-active conformation. (See self-assembly.) Identical monomers with nonreactive side groups result in a polymer chain that will tend to adopt a random coil conformation, as described by an idea..