Copolymers acidic

Use of dimethylaminoethyl (also rert-butylaminoethyl) methacrylate as a monomer permits the introduction of pendent amino groups which can serve as sites for secondary cross-linking, provide a way to make the copolymer acid-soluble, and provide anchoring sites for dyes and pigments. 

The acetal polymers are probably never supplied for use without any additives being incorporated. As mentioned in Section 19.3.1 antioxidants of the phenol alkane type are present in both homopolymers and copolymers. Acid acceptors are also believed to be widely used to absorb traces of acidic materials which attack the acetal linkage. Epoxides, nitrogen compounds and basic salts have been successfully employed. 

Drug Acid Copolymer Acid Copolymer Acid... 

Polyethylene is the highest volume plastic available today. Global consumption of polyethylene was about 150 billion pounds (67.8 million metric tons) in 2006 and is forecast to grow to about 185 billion pounds (82.9 million metric tons) in 2010 Polyethylene demand, total capacity and percent operating rates from 1995 to 2010 are shown in Figure 1 Polyethylene is composed of mainly carbon and hydrogen (with some notable exceptions such as ethylene vinyl acetate copolymer, acid copolymers, etc.) which can be combined in number of ways. Various polyethylene molecular architectures have been commercialized over last 70 years to make different types of polyethylene. These various molecular architectures can be grouped into ten major types of polyethylene ... 

LDPE, low-density polyethylene EVA, ethylene vinyl acetate copolymer Acid copolymers such as ethylene acrylic acid (EAA) or ethylene methacrylic acid (EMA) copolymers... 

For the CHD-blsmethylcarbonate polymers and copolymers acid catalysis is only effective for the first 11-18 mole % of the reaction and then the rate becomes equivalent to the uncatalyzed reaction. This anomaly suggests a different structural entity for at least 11 mole % of the CHD-bismethyl-carbonate homopolymer. 

High-frequency titration gives a precise location of the inflection points related to the polymer carboxyl groups, and is a sensitive method for the determination of the freedom of the copolymer samples from monobasic acid impurities (comonomer acids). This is because mixtures of copolymer acids with monobasic and dibasic acids show definite inflection points that can be related to the individual carboxylate species present. 

Krilium The trade name of a soil conditioner. The solid form of Krilium has as active in-gredienl a copolymer of about equal molar proportions of vinyl ethanoate and the partial methyl ester of maleic acid. It may be formulated with lime, bentonite, etc. In aqueous form, Krilium contains a copolymer of about equal molar proportions of isobutene and ammonium maleamate. Other polymers are also used. 

Additives acting on the pour point also modify the crystal size and, in addition, decrease the cohesive forces between crystals, allowing flow at lower temperatures. These additives are also copolymers containing vinyl esters, alkyl acrylates, or alkyl fumarates. In addition, formulations containing surfactants, such as the amides or fatty acid salts and long-chain dialkyl-amines, have an effect both on the cold filter plugging point and the pour point. 

To illustrate the specific operations involved, the scheme below shows the first steps and the final detachment reaction of a peptide synthesis starting from the carboxyl terminal. N-Boc-glycine is attached to chloromethylated styrene-divinylbenzene copolymer resin. This polymer swells in organic solvents but is completely insoluble. ) Treatment with HCl in acetic acid removes the fert-butoxycarbonyl (Boc) group as isobutene and carbon dioxide. The resulting amine hydrochloride is neutralized with triethylamine in DMF. 

Poly(chlorotrifluoroethylene) (PCTFE) Butadiene-maleic acid copolymer (BMC)... 

Perfluoroalkoxy (PEA) resin Styrene-maleic acid copolymer (SMC)... 

Copolymer. Acetal copolymers are prepared by copolymerization of 1,3,5-trioxane with small amounts of a comonomer. Carbon-carbon bonds are distributed randomly in the polymer chain. These carbon-carbon bonds help to stabilize the polymer against thermal, oxidative, and acidic attack. 

These monomers provide a means for introducing carboxyl groups into copolymers. In copolymers these acids can improve adhesion properties, improve freeze-thaw and mechanical stability of polymer dispersions, provide stability in alkalies (including ammonia), increase resistance to attack by oils, and provide reactive centers for cross-linking by divalent metal ions, diamines, or epoxides. 

Extrusion- Injection acid copolymer. maleic acid Putty, Glass-fiber- Polyimide,... 

Just as it is not necessary for polymer chains to be linear, it is also not necessary for all repeat units to be the same. We have already mentioned molecules like proteins where a wide variety of different repeat units are present. Among synthetic polymers, those in which a single kind of repeat unit are involved are called homopolymers, and those containing more than one kind of repeat unit are copolymers. Note that these definitions are based on the repeat unit, not the monomer. An ordinary polyester is not a copolymer, even though two different monomers, acids and alcohols, are its monomers. By contrast, copolymers result when different monomers bond together in the same way to produce a chain in which each kind of monomer retains its respective substituents in the polymer molecule. The unmodified term copolymer is generally used to designate the case where two different repeat units are involved. Where three kinds of repeat units are present, the system is called a terpolymer where there are more than three, the system is called a multicomponent copolymer. The copolymers we discuss in this book will be primarily two-component molecules. We shall discuss copolymers in Chap. 7, so the present remarks are simply for purposes of orientation. 

Copolymers can be used to introduce a mixture of chemical functionalities into a polymer. Acidic and basic substituents can be introduced, for example, through comonomers like acrylic acid and vinyl pyridine. The resulting copolymers show interesting amphoteric behavior, reversing their charge in solution with changes of pH. 

Acrylamide-acrylamido-2-methylpropane sulfonic acid copolymers [40623-74-2]... 

Acrylic acid polymers Acrylic adhesives Acrylic anhydride Acrylic copolymer Acrylic-cotton blends Acrylic elastomers... 

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