Additive properties coagulated polymers

Uses Monomer for synthesis of homo and copolymers used as coagulant and floc-culants for water treatment, min. processing, demulsifier for petrol, recovery, elec, conductive paper and coatings, wet and dry sir. resins, anfistafic additives and coatings, cosmetic additives in hair conditioners, biocides, detergent additives, water-sol. polymers, eleclrographic paper and film Properties Cl. liq. water-sol. m.w. 161.68 sp.gr. 1.04 dens. 8.7 Ib/gal vise. 15 cps pH 6 65% solids... 

To improve the properties of the raw polymer (wear resistance, creep resistance, thermal and electrical conductivity), various fillers, such as glass fibers, powdered metals, and graphite, are combined with all three types of PTFE polymers, mostly by intimate mixing. Filled fine powders are produced mostly by adding fillers into a dispersion and then coagulating the mixture. Aqueous dispersions can also be modified by the addition of certain fillers, pigments, heat resistant dyes, carbon blacks, and powdered metals, especially when processed into films (see Chapter 6). 

A considerable amount of work has focused on the design and synthesis of macromolecules for use as emulsifiers for lipophilic materials and as polymeric stabilizers for the colloidal dispersion of lipophilic, hydrocarbon polymers in compressed CO2. It has been shown that fluorinated acrylate homopolymers, such as PFOA, are effective amphiphiles as they possess a lipophilic acrylate-like backbone and C02-philic, fluorinated side chains, as indicated in Figure 4.5-1 [100]. Furthermore, it has been demonstrated that a homopolymer which is physically adsorbed to the surface of a polymer colloid precludes coagulation due to the presence of loops and tails [110]. These fluorinated acrylate homopolymers can be synthesized homogeneously in CO2 as described in an earlier section. The solution properties [111,112] and phase behavior [45] of PFOA in SCCO2 have been thoroughly examined. Additionally, the backbone of these materials can be made more lipophilic in nature by incorporating other monomers to make random copolymers [34]. 

Aromatic PA films are produced by casting a polymer solution in sulfuric acid onto an endless belt. In addition, the solution contains nucroparticles of silica to improve the surface properties. The casting solution is guided after intermediate heating into a coagulation bath and the film is released from the belt and post treated. 

Hardening of cement mortars modified with water-soluble polymers comprises both cement hardening by hydration as well as polymer solidification by coagulation and film formation. Whereas the effect of polymer dispersions on the microstructure formation is frequently studied [1], only little information is available about the effect of polymer solutions. In contrast to polymer dispersions, water-soluble polymers are dissolved in the mixing water on a molecular scale and no surfactants are needed. However, the addition of small amounts of water-soluble polymers (usually below 4%) also influences the properties of the hardened material [2], This paper deals with the effect of the presence of water-soluble polymers on the microstructure. The study is made by means of SEM investigation. Polyvinyl alcohol-acetate (PVAA), Methylcellulose (MC) and Hydroxyethylcellulose (HEC) are applied in a 1 % polymer-cement ratio. This study was part of the doctoral research of E. Knapen [3],... 

Formula [CH2=C(CH3)COOCH2CH2N(CH3)3] Cr Properties M.w. 207.70 Uses Antistatic finish for polyester fibers flocculant and coagulant for water treatment, mineral recovery, ion-exchange resins, adhesives, acid dye receptivity photopolymer plates photoresists paint resins oil additives electro dipcoats rubber modifiers dental compds. water-sol. polymers adhesion promoter prod, of cationic acrylamide copolymers mfg. of quats retention aid for paper mfg. food-contact paper/paperboard Manuf./Distrib. Aldrich http //www.sigma-aidrich.com... 

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