Polymerization polycondensation

Condensation polymerization differs from addition polymerization in that the polymer is formed by reaction of monomers, each step in the process resulting in the elimination of some easily removed molecule (often water). E.g. the polyester polyethylene terephthalate (Terylene) is formed by the condensation polymerization (polycondensation) of ethylene glycol with terephthalic acid ... 

Until now the discussion has centered on the addition polymers obtained fiom unsaturated monomers by reaction of the C=C or C=0 double bond. However, polymers obtained by other methods (ring-opening polymerization, polycondensation, etc.) offer interesting stereochemical phenomena also. As a rule, in these classes of macromolecular compounds the monomer units are clearly defined, the direction of the chain is often distinguishable and the stereo-isomeric elements present in the chain already preexist in the monomer. There are, however, numerous exceptions and further clarification is called for. 

Table 2.3. Synthesis of macromolecules by step growth polymerization (polycondensation)...

Condensation polymerizations (polycondensations) are stepwise reactions between bifunctional or polyfunctional components, with elimination of small molecules such as water, alcohol, or hydrogen and the formation of macromo-lecular substances. For the preparation of linear condensation polymers from bifunctional compounds (the same considerations apply to polyfunctional compounds which then lead to branched, hyperbranched, or crosslinked condensation polymers) there are basically two possibilities. One either starts from a monomer which has two unlike groups suitable for polycondensation (AB type), or one starts from two different monomers, each possessing a pair of identical reactive groups that can react with each other (AABB type). An example of the AB type is the polycondensation of hydroxycarboxylic acids ... 

Inorganic and organic parts of the nanocomposite are multidimensional interpenetrating nets bound to each other by the chemical bonds. The formation of the inorganic part occurs due to polymerization-polycondensation reac-... 

Polymerization, polycondensation, polyaddition and other reactions Thermoplastic polyurethranes, silicone polymers... 

Use of Continuous System Modeling Program (CSMP) to Simulate Polymerization, Polycondensation, and Polymer Modification Reactions... 

Polymerization, polycondensation and polymer modification reactions are dynamic processes that are often represented by sets of differential equations. Analytical integration of such equations is often difficult or impossible and the solutions that are obtained often have complex forms that provide limited insight concerning the nature of the processes. This has been particular-... 

The examples discussed herein show that very simple, easily written CSMP programs can be used to treat complex kinetic problems that are encountered in studies on polymerization, polycondensations and polymer modification reactions. It is obvious that CSMP is also applicable to problems involving polymer processing or the dynamic behavior of polymers in solution or bulk. Polymer scientists would be well advised to become familiar with this valuable program. It would also seem important to use CSMP in the classroom. We hope that the instructions and examples provided herein will help others to use CSMP programming effectively and with minimum difficulty. 

Conversion Polymerization Polycondensation. Hiithig Wepf, New York, 1986. 

The existing information discussed above indicates that various Mn oxides differ in their ability to catalyze oxidative polymerization, polycondensation, and degradation of organics. Abiotic formation of humic substances, C turnover, and N transformations in nature as catalyzed by Mn oxides, thu.s, deserves in-depth research. 

Hardener Adhesive component, triggering the chemical setting of an adhesive by polymerization, polycondensation or polyaddition, added or admixed to the adhesive resin, often also called second component . 

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