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Polymer:A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers) • Generally not a well defined structure, or molecular weight. • Need to use statistical properties to describe. Polymers are formed by linking monomers through chemical reaction — called polymerization.
40.3NYLON Polymer Chemistry: Nylon 66 (or 6,6 - Nylon) is a condensation polymer ation polymerization of Adipic acid ( and hexamethylenediamine (a diamine). In the nomenclature, the first number refers to the number of carbon atoms in the diamine and the second
As a consequence of this transition, the polymer undergoes anabrupt change in properties. Among these are coefficient of expansion, permeability, heat content, refractive index, and hardness.
It also examines the requirements for polymer formation from monomers and discusses polymer structure at three levels: primary, secondary, and tertiary. The relationship between the structure of the monomers and properties of the resulting polymer is highlighted. This section continues with a discussion of polymer modification techniques.
A polymer is a macromolecule (long molecules) built of small covalently bonded units called monomers (“mer” from the Greek word meros meaning part). These small units are repeated throughout the macromolecule chain. The macromolecules are bonded together by weak Van der Waals and hydrogen (secondary) bonds, or additional covalent cross-links.
A low-molecular weight byproduct (i.e., water) is produced during the polymerization of Nylon 66. This is a characteristic of condensation polymers. That is, if both a high-molecular weight polymer as well as a low-molecular weight byproduct is formed during the polymerization process, the polymer is classified as a condensation polymer.
The growing polymer particles sink downwards and are continuously removed at the bottom of the reactor and separated from residual monomer and pre-polymer which is fed back into the reactor.
Polymer y Natural, semisynthetic and synthetic compounds consisting of number of molecules (monomers) called Polymer. e.g., Polypropene, Polystyrene, PVC, Nylon-6 etc.
Definition of polymers: A polymer is a large molecule of high molecular weight obtained by the chemical interaction of many small molecules of low molecular weight of one or more type. The process of manufacture of a polymer is called the polymerization.
16.1 Introduction A polymer is a macromolecule, made up of many smaller repeating units called monomer. Polymers have high molecular weight in the range of several thousand or even higher. The first synthetic organic polymer polyvinylchloride was synthesized in 1838 by accidentally. Later, polystyrene was discovered in 1839.
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