polymeric materials
... Polymerization is the formation of chemical linkages between relatively small molecules or monomers to form very large molecules or polymers. These linkages are formed by either one or two of the following two types: addition or condensation. Addition polymerization process is characterized by the s ...
... Polymerization is the formation of chemical linkages between relatively small molecules or monomers to form very large molecules or polymers. These linkages are formed by either one or two of the following two types: addition or condensation. Addition polymerization process is characterized by the s ...
Structure and Properties of Polymers
... more than two groups capable of undergoing a polycondensation reaction, the resulting macromolecules are not linear but branched (Figure 9). For instance, when a monomer molecule with three functional groups capable of condensation is incorporated in a macromolecule, it can become a trifunctional br ...
... more than two groups capable of undergoing a polycondensation reaction, the resulting macromolecules are not linear but branched (Figure 9). For instance, when a monomer molecule with three functional groups capable of condensation is incorporated in a macromolecule, it can become a trifunctional br ...
Non-Ideal Chains: Size, Statistics, Free
... provide R ∼ N 0.588 . However, the success of the Flory theory is due to a cancelation of errors. The excluded volume contributions are overestimated as correlations between monomers (which decrease the probability of overlap) are not considered. At the same time, the entropic restoring force is als ...
... provide R ∼ N 0.588 . However, the success of the Flory theory is due to a cancelation of errors. The excluded volume contributions are overestimated as correlations between monomers (which decrease the probability of overlap) are not considered. At the same time, the entropic restoring force is als ...
Chapter 14
... – Rubber balls used by Incas – Noah used pitch (a natural polymer) for the ark Chapter 14 - 3 ...
... – Rubber balls used by Incas – Noah used pitch (a natural polymer) for the ark Chapter 14 - 3 ...
Nugget
... Polymerized ionic liquids have excellent thermal resistance, high CO2 sorption capacities at low pressure, fast reversible adsorption/desorption, and exceptional selectivity for CO2 over permanent gases. These properties make pILs outstanding candidates as membrane separation layers for selective CO ...
... Polymerized ionic liquids have excellent thermal resistance, high CO2 sorption capacities at low pressure, fast reversible adsorption/desorption, and exceptional selectivity for CO2 over permanent gases. These properties make pILs outstanding candidates as membrane separation layers for selective CO ...
amcommu 555..558 - Leibniz-Institut für Polymerforschung Dresden
... 12-mercaptododecylamine was prepared according to the following procedure: Reaction of 11-bromoundec-1-ene (Lancaster) with thioacetic acid in the presence of AIBN in refluxing CHCl3 yields 11-bromoundecane-1thioacetate. NaCN (2.0 g, 45 mmol) was dissolved in anhydrous DMSO under argon at 100 C and ...
... 12-mercaptododecylamine was prepared according to the following procedure: Reaction of 11-bromoundec-1-ene (Lancaster) with thioacetic acid in the presence of AIBN in refluxing CHCl3 yields 11-bromoundecane-1thioacetate. NaCN (2.0 g, 45 mmol) was dissolved in anhydrous DMSO under argon at 100 C and ...
3Basic Polymer Chemistry
... are considered to be bifunctional with two reactive bonding sites. Monomers (Figure 3.2) are the initial basic units used in forming polymers and in most cases are liquids. The chemical reaction or process that joins these monomers together is called ‘polymerisation’. If the polymer consists of simi ...
... are considered to be bifunctional with two reactive bonding sites. Monomers (Figure 3.2) are the initial basic units used in forming polymers and in most cases are liquids. The chemical reaction or process that joins these monomers together is called ‘polymerisation’. If the polymer consists of simi ...
Polymers
... 1.What are polymers? What is polymerization? Give examples. Polymers are important engineering materials. Polymers have diversified uses in day-to-day life. Natural polymers, such as polysaccharides, cellulose starch proteins, have been parts of every living being since the beginning of life. In add ...
... 1.What are polymers? What is polymerization? Give examples. Polymers are important engineering materials. Polymers have diversified uses in day-to-day life. Natural polymers, such as polysaccharides, cellulose starch proteins, have been parts of every living being since the beginning of life. In add ...
First Poly(2-oxazoline)s with Pendant Amino Groups
... behavior of each monomer unit.[15] Longer saturated chains, such as n-nonyl- groups, result in a strong amphiphilic motif and the polymer can be characterized as a non-ionic polysoap. A combination of hydrophilic and amphiphilic monomer units via block copolymerization leads to amphiphilic polysoaps ...
... behavior of each monomer unit.[15] Longer saturated chains, such as n-nonyl- groups, result in a strong amphiphilic motif and the polymer can be characterized as a non-ionic polysoap. A combination of hydrophilic and amphiphilic monomer units via block copolymerization leads to amphiphilic polysoaps ...
Synthetic Polymers - McQuarrie General Chemistry
... can be increased by increasing the number of crosslinks between chains. High elasticity is found in substances composed of long polymer chains joined by sparsely distributed cross-links, such as the polymer chains found in rubber bands. Natural rubber is composed of chains of cis-1,4-isoprene units ...
... can be increased by increasing the number of crosslinks between chains. High elasticity is found in substances composed of long polymer chains joined by sparsely distributed cross-links, such as the polymer chains found in rubber bands. Natural rubber is composed of chains of cis-1,4-isoprene units ...
EXPERIMENT 28 Intrinsic Viscosity: Chain Linkage in Polyvinyl
... solution up to the mark with distilled water and mix by slowly inverting a few times. If the solution appears contaminated with insoluble material that would possibly interfere with the viscosity measurements, filter it through Pyrex wool. (Since making up this solution may take considerable time, i ...
... solution up to the mark with distilled water and mix by slowly inverting a few times. If the solution appears contaminated with insoluble material that would possibly interfere with the viscosity measurements, filter it through Pyrex wool. (Since making up this solution may take considerable time, i ...
Photo/electro-respondent functional polymers
... can also serve as matrices for electroactive low-molecular-weight materials, like, e.g., in photorefractive memory disks. These systems seem to offer good prospects in preparation of photo/electro active inks suitable for screen and inkjet printing cold technologies. From the point of view of photo/ ...
... can also serve as matrices for electroactive low-molecular-weight materials, like, e.g., in photorefractive memory disks. These systems seem to offer good prospects in preparation of photo/electro active inks suitable for screen and inkjet printing cold technologies. From the point of view of photo/ ...
Mechanisms 3
... HCN is an extremely weak acid, not enough CN- nucleophiles would be present to start the reaction. ...
... HCN is an extremely weak acid, not enough CN- nucleophiles would be present to start the reaction. ...
ppt
... polymer liquid behaves as network with “quasi-cross-links”, and the response is elastic; while at t * “quasi-cross-links” relax, and the response is viscous. What is the elastic modulus E for the network of “quasi-cross-links”? According to the classical theory of high elasticity E kT , where ...
... polymer liquid behaves as network with “quasi-cross-links”, and the response is elastic; while at t * “quasi-cross-links” relax, and the response is viscous. What is the elastic modulus E for the network of “quasi-cross-links”? According to the classical theory of high elasticity E kT , where ...
Surface Polymerisation (Polymer) 1 Plasma Enhanced Chemical
... which is responsible for the film chemistry. Another method to control the monomer fragmentation and the ion bombardment consists in pulsing the discharge. Because of the potential distribution in a discharge, the positively charged fragments are accelerated towards the substrate surface, which has ...
... which is responsible for the film chemistry. Another method to control the monomer fragmentation and the ion bombardment consists in pulsing the discharge. Because of the potential distribution in a discharge, the positively charged fragments are accelerated towards the substrate surface, which has ...
Controlled Fabrication of Cross-Linked Nanoparticles/Polymer
... of particles in the thin films which are required for most of the applications. Alternatively, surface-initiated atom transfer radical polymerization (ATRP) is one of the most robust and versatile approaches for the synthesis of pure polymer films, due to its ease of controlling the thickness, the l ...
... of particles in the thin films which are required for most of the applications. Alternatively, surface-initiated atom transfer radical polymerization (ATRP) is one of the most robust and versatile approaches for the synthesis of pure polymer films, due to its ease of controlling the thickness, the l ...
Linear Polymer
... A pendant group on a polymer is a small group of atoms (even a small chain sometimes) that hangs off of the main chain (that is, the backbone of the polymer). ...
... A pendant group on a polymer is a small group of atoms (even a small chain sometimes) that hangs off of the main chain (that is, the backbone of the polymer). ...
Week 10 Day 2-Plastics - Washington State University
... strain • Damping—ability to absorb energy Properties are often temperature and rate dependent (Viscoelastic) ...
... strain • Damping—ability to absorb energy Properties are often temperature and rate dependent (Viscoelastic) ...
Combustion and thermal degradation of polymers
... therefore, from the fact that the ultraviolet portion of the sunlight spectrum can be absorbed by various polymeric materials. The resulting chemical processes may lead to severe property deteriorations. Degradation arising in high energy radiation such as electromagnetic radiation (Xrays, γ-rays) o ...
... therefore, from the fact that the ultraviolet portion of the sunlight spectrum can be absorbed by various polymeric materials. The resulting chemical processes may lead to severe property deteriorations. Degradation arising in high energy radiation such as electromagnetic radiation (Xrays, γ-rays) o ...
Chemistry 595: Physical Chemistry of Polymers
... A note about the Course Project: Choose a topic concerning the Physical Chemistry of Polymers which interests you. You may discuss the topic with me or ask my advice. Once you select the topic, go to literature and learn about the current state of knowledge in that topic. Write a ~6-8 pages paper de ...
... A note about the Course Project: Choose a topic concerning the Physical Chemistry of Polymers which interests you. You may discuss the topic with me or ask my advice. Once you select the topic, go to literature and learn about the current state of knowledge in that topic. Write a ~6-8 pages paper de ...
eprint_5_24935_775
... peptide linkages to form polyamides or polypeptides. Polypeptides are often used by biologists to denote oligomers or relatively low molecular weight proteins. All α-amino acids found in proteins, except glycine (Gly), contain a chiral carbon atom and are Lamino acids. ...
... peptide linkages to form polyamides or polypeptides. Polypeptides are often used by biologists to denote oligomers or relatively low molecular weight proteins. All α-amino acids found in proteins, except glycine (Gly), contain a chiral carbon atom and are Lamino acids. ...
POLYMERS
... The amount of branching is an additional variable for the molecule to be fully characterized. If a molecule has ν branches, it has ν + 2 chain ends. Two limiting cases are combs and stars. If the concentration of junction points is high enough, a point can be reached at which the polymer molecule b ...
... The amount of branching is an additional variable for the molecule to be fully characterized. If a molecule has ν branches, it has ν + 2 chain ends. Two limiting cases are combs and stars. If the concentration of junction points is high enough, a point can be reached at which the polymer molecule b ...
Free-radical polymerization
... The absorption steps and the termination reactions are generally not affected. The advantage of photopolymerization and photosensitized polymerization is that the initiation process may take place over a wide range of temperatures and with a greater specificity than is found in chemically initiated ...
... The absorption steps and the termination reactions are generally not affected. The advantage of photopolymerization and photosensitized polymerization is that the initiation process may take place over a wide range of temperatures and with a greater specificity than is found in chemically initiated ...
Radical polymerization
Free radical polymerization is a method of polymerization by which a polymer forms by the successive addition of free radical building blocks. Free radicals can be formed via a number of different mechanisms usually involving separate initiator molecules. Following its generation, the initiating free radical adds (nonradical) monomer units, thereby growing the polymer chain.Free radical polymerization is a key synthesis route for obtaining a wide variety of different polymers and material composites. The relatively non-specific nature of free radical chemical interactions makes this one of the most versatile forms of polymerization available and allows facile reactions of polymeric free radical chain ends and other chemicals or substrates. In 2001, 40 billion of the 110 billion pounds of polymers produced in the United States were produced by free radical polymerization.Free radical polymerization is a type of chain growth polymerization, along with anionic, cationic and coordination polymerization.