Inorganic Polymers, Second Edition
... Institute of Brooklyn before moving to the University of Michigan, where he became a Full Professor in 1972. In 1977, he assumed the position of Professor of Chemistry at the University of Cincinnati, and served as Chairman of the Physical Chemistry Division and Director of the Polymer Research Cent ...
... Institute of Brooklyn before moving to the University of Michigan, where he became a Full Professor in 1972. In 1977, he assumed the position of Professor of Chemistry at the University of Cincinnati, and served as Chairman of the Physical Chemistry Division and Director of the Polymer Research Cent ...
Design of Thermoresponsive Polymers with
... biomedicine.1−4 Polymers that exhibit temperature responsiveness, especially in aqueous solution, are particularly versatile materials.5,6 Their ability to change abruptly and reversibly between hydrophobic globular and hydrophilic coil states can be triggered not only by subtle temperature changes ...
... biomedicine.1−4 Polymers that exhibit temperature responsiveness, especially in aqueous solution, are particularly versatile materials.5,6 Their ability to change abruptly and reversibly between hydrophobic globular and hydrophilic coil states can be triggered not only by subtle temperature changes ...
THE ROLE OF FeSO4 IN THE OBTAINING OF
... materials for the composite metal hydrogels because they are highly porous systems. The original porous structure providing copolymers swelling in water and high penetrability for low-molecular compounds are the main factors which allow to use them as the matrices for metal reduction [4]. Recently w ...
... materials for the composite metal hydrogels because they are highly porous systems. The original porous structure providing copolymers swelling in water and high penetrability for low-molecular compounds are the main factors which allow to use them as the matrices for metal reduction [4]. Recently w ...
Tuning the Molecular Properties of Polybenzimidazole by
... obtain a membrane that will show a very high acid doping level and moderately good mechanical stability. It has been shown that with increasing acid doping level, the mechanical stability becomes poor. Therefore, a trade-off between these two important parameters has to be maintained for preparing a ...
... obtain a membrane that will show a very high acid doping level and moderately good mechanical stability. It has been shown that with increasing acid doping level, the mechanical stability becomes poor. Therefore, a trade-off between these two important parameters has to be maintained for preparing a ...
Physical Chemistry of Polymers: Entropy
... broad molecular weight distributions and offer little control over long-chain architectural characteristics such as branching. Although of tremendous commercial importance, such approaches are inadequate for preparing model polymers, with tightly controlled molecular structures, that are essential f ...
... broad molecular weight distributions and offer little control over long-chain architectural characteristics such as branching. Although of tremendous commercial importance, such approaches are inadequate for preparing model polymers, with tightly controlled molecular structures, that are essential f ...
SYNTHESIS OF HIGH MOLECULAR WEIGHT POLY (METHYL
... 1.1.2 Polymerization Method to Synthesize Poly (methyl methacrylate) Several polymerization methods including ionic polymerization and free radical polymerization have been used to synthesize PMMA. Anionic polymerization contains an anionic active center while free radical polymerization has a free ...
... 1.1.2 Polymerization Method to Synthesize Poly (methyl methacrylate) Several polymerization methods including ionic polymerization and free radical polymerization have been used to synthesize PMMA. Anionic polymerization contains an anionic active center while free radical polymerization has a free ...
doc_296
... substances may be placed. Technologies for microencapsulating materials have been around for several years, primarily for applications involving minimisation of hygroscopy and chemical interactions, elimination of oxidation, and controlled release of nutraceuticals. The Use of Man-Made Liposomes Man ...
... substances may be placed. Technologies for microencapsulating materials have been around for several years, primarily for applications involving minimisation of hygroscopy and chemical interactions, elimination of oxidation, and controlled release of nutraceuticals. The Use of Man-Made Liposomes Man ...
Controlling monomer-sequence using
... monomers and/or the growing polymer are required for a template to exert control over any property of the polymer. In literature, the term templating is occasionally also used for systems where covalent bonds are used to influence the properties of polymers (in an intramolecular polymerisation), but ...
... monomers and/or the growing polymer are required for a template to exert control over any property of the polymer. In literature, the term templating is occasionally also used for systems where covalent bonds are used to influence the properties of polymers (in an intramolecular polymerisation), but ...
Controlling monomer-sequence using supramolecular
... monomers and/or the growing polymer are required for a template to exert control over any property of the polymer. In literature, the term templating is occasionally also used for systems where covalent bonds are used to influence the properties of polymers (in an intramolecular polymerisation), but ...
... monomers and/or the growing polymer are required for a template to exert control over any property of the polymer. In literature, the term templating is occasionally also used for systems where covalent bonds are used to influence the properties of polymers (in an intramolecular polymerisation), but ...
Analysis of PEA photopolymers at zero spatial frequency limit
... incidence we should take into account both the Fresnel coefficients at the interface and the increase of distance in the propagation across the layer. In the first arm, the exposure beam provided by a solid-state Nd-YVO4 Verdi laser with a wavelength of 532 nm (at this wavelength the dye presents th ...
... incidence we should take into account both the Fresnel coefficients at the interface and the increase of distance in the propagation across the layer. In the first arm, the exposure beam provided by a solid-state Nd-YVO4 Verdi laser with a wavelength of 532 nm (at this wavelength the dye presents th ...
Full text, pdf
... of the evolutionary process that might be instrumental for the reconstruction of the primordial events. 1) According to Darwin, biological evolution is driven by the selection of the fittest. Living organisms evolve because they a) undergo spontaneous changes and, hence, are not all identical; b) re ...
... of the evolutionary process that might be instrumental for the reconstruction of the primordial events. 1) According to Darwin, biological evolution is driven by the selection of the fittest. Living organisms evolve because they a) undergo spontaneous changes and, hence, are not all identical; b) re ...
Frieder Jäkle FUNCTIONAL MATERIALS AND ORGANOBORON
... new boron polymers (PS-BR2; R = alkyl, aryl, alkoxy, amino groups), including highly Lewis acidic triarylborane polymers that are otherwise very difficult to prepare. In contrast to most previously reported organoboron polymers, we are able to realize different polymer architectures and place the Le ...
... new boron polymers (PS-BR2; R = alkyl, aryl, alkoxy, amino groups), including highly Lewis acidic triarylborane polymers that are otherwise very difficult to prepare. In contrast to most previously reported organoboron polymers, we are able to realize different polymer architectures and place the Le ...
EXPERIMENT 28 Intrinsic Viscosity: Chain Linkage in Polyvinyl
... not easy to specify exactly in terms of a molecular formula. Moreover, the macromolecules in a given sample are seldom uniform in chain length or molecular weight (which for a linear polymer is proportional to chain length); thus the nature of the distribution of molecular weights is another importa ...
... not easy to specify exactly in terms of a molecular formula. Moreover, the macromolecules in a given sample are seldom uniform in chain length or molecular weight (which for a linear polymer is proportional to chain length); thus the nature of the distribution of molecular weights is another importa ...
Non-Ideal Chains: Size, Statistics, Free
... Excluded volume scales as v ≈ b2 d where b is the Kuhn monomer size (length) and d is the diameter (Kuhn segments are rod-like). • Athermal Solvents Here, v is independent of temperature. The system only features hard core repulsion and v ≈ b2 d. Monomer-monomer contact is energetically indistinguis ...
... Excluded volume scales as v ≈ b2 d where b is the Kuhn monomer size (length) and d is the diameter (Kuhn segments are rod-like). • Athermal Solvents Here, v is independent of temperature. The system only features hard core repulsion and v ≈ b2 d. Monomer-monomer contact is energetically indistinguis ...
full text pdf
... of functional monomer, non-covalent bonds or stronger covalent bonds are formed. Their formation is determined by a number of factors which will ultimately determine the quality and durability of the obtained polymer [Luliński et al. 2008]. The most important parameters that influence the molecular ...
... of functional monomer, non-covalent bonds or stronger covalent bonds are formed. Their formation is determined by a number of factors which will ultimately determine the quality and durability of the obtained polymer [Luliński et al. 2008]. The most important parameters that influence the molecular ...
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 ...
Surface Polymerisation (Polymer) 1 Plasma Enhanced Chemical
... processes and initiation and chain termination reactions dominated here over chain propagation. Moreover termination does not necessary interrupt the plasma polymerization, since the neutrals formed in the termination step can undergo reinitiation and propagation reactions due to further electron or ...
... processes and initiation and chain termination reactions dominated here over chain propagation. Moreover termination does not necessary interrupt the plasma polymerization, since the neutrals formed in the termination step can undergo reinitiation and propagation reactions due to further electron or ...
Polymers
... These unsaturated monomers have extra internal bonds which are able to break and link up with other monomers to form repeating chain. All the addition polymers are chain growth polymers, but few examples of condensation polymers are also present those mechanism proceed through chain growth polymeris ...
... These unsaturated monomers have extra internal bonds which are able to break and link up with other monomers to form repeating chain. All the addition polymers are chain growth polymers, but few examples of condensation polymers are also present those mechanism proceed through chain growth polymeris ...
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 ...
Combustion and thermal degradation of polymers
... the emulsion of water insoluble monomers (such as styrene) in aquous soap solution. Ionic polymerization There are two types of ionic polymerization: anionic and cationic. The formers involve carbanions C- and the later involves carbonium C+ ions. Catalysts and cocatalysts are needed in ionic polyme ...
... the emulsion of water insoluble monomers (such as styrene) in aquous soap solution. Ionic polymerization There are two types of ionic polymerization: anionic and cationic. The formers involve carbanions C- and the later involves carbonium C+ ions. Catalysts and cocatalysts are needed in ionic polyme ...
POLYMERS
... 3. The product molecules often have an all-carbon chain backbone. In contrast, for condensation polymers: 4. The polymer repeat unit arises from reacting two different functional groups, it is different from either of the monomers and small molecules are often eliminated during the condensation reac ...
... 3. The product molecules often have an all-carbon chain backbone. In contrast, for condensation polymers: 4. The polymer repeat unit arises from reacting two different functional groups, it is different from either of the monomers and small molecules are often eliminated during the condensation reac ...
Polymer Properties and Structure
... Name three steps in the addition polymerization process Distinguish between addition and condensation polymerization Describe essential features of condensation polymerization Identify polymerization process used on basis of polymer composition ...
... Name three steps in the addition polymerization process Distinguish between addition and condensation polymerization Describe essential features of condensation polymerization Identify polymerization process used on basis of polymer composition ...
Ring-opening polymerization
In polymer chemistry, ring-opening polymerization (ROP) is a form of chain-growth polymerization, in which the terminal end of a polymer chain acts as a reactive center where further cyclic monomers can react by opening its ring system and form a longer polymer chain (see figure). The propagating center can be radical, anionic or cationic. Some cyclic monomers such as norbornene or cyclooctadiene can be polymerized to high molecular weight polymers by using metal catalysts. ROP continues to be the most versatile method of synthesis of major groups of biopolymers, particularly when they are required in quantity.The driving force for the ring-opening of cyclic monomers is via the relief of bond-angle strain or steric repulsions between atoms at the center of a ring. Thus, as is the case for other types of polymerization, the enthalpy change in ring-opening is negative.Cyclic monomers that are polymerized using ROP encompass a variety of structures, such as:alkanes, alkenes, compounds containing heteroatoms in the ring: oxygen: ethers, acetals, esters (lactones, lactides, and carbonates), and anhydrides, sulfur: polysulfur, sulfides and polysulfides, nitrogen: amines, amides (lactames), imides, N-carboxyanhydrides and 1,3-oxaza derivatives, phosphorus: phosphates, phosphonates, phosphites, phosphines and phosphazenes, silicon: siloxanes, silathers, carbosilanes and silanes.↑ ↑ ↑