CH2CH2 in .NET

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CH2CH2 O n , from ethylene oxide. instead of the polymer, Some polymers are named as being derived from hypothetical monomers. Thus poly (vinyl alcohol) is actually produced by the hydrolysis of poly(vinyl acetate)
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HO + nH2O CH2 CH
+ nCH3COOH
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It is, however, named as a product of the hypothetical monomer vinyl alcohol (which in reality exists exclusively as the tautomer acetaldehyde). Condensation polymers synthesized from single reactants are named in a similar manner. Examples are the polyamides and polyesters produced from amino acids and hydroxy acids, respectively. Thus, the polymer from 6-aminocaproic acid is named poly(6-aminocaproic acid)
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NOMENCLATURE OF POLYMERS
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CH2CH2CH2CH2CH2 6-Aminocaproic acid
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Poly(6-aminocaproic acid)
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It should be noted that there is an ambiguity here in that poly(6-aminocaproic acid) and poly(E-caprolactam) are one and the same polymer. The same polymer is produced from two different monomers a not uncommonly encountered situation. 1-2b Nomenclature Based on Structure (Non-IUPAC)
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A number of the more common condensation polymers synthesized from two different monomers have been named by a semisystematic, structure-based nomenclature system other than the more recent IUPAC system. The name of the polymer is obtained by following the pre x poly without a space or hyphen with parentheses enclosing the name of the structural grouping attached to the parent compound. The parent compound is the particular member of the class of the polymer the particular ester, amide, urethane, and so on. Thus the polymer from hexamethylene diamine and sebacic acid is considered as the substituted amide derivative of the compound sebacic acid, HO2 C(CH2 )8 CO2 H, and is named poly(hexamethylene sebacamide). Poly(ethylene terephthalate) is the polymer from ethylene glycol and terephthalic acid, p-HO2 C 6 H4 2 H. The polymer from trimethylene glycol and ethylene diiso C CO cyanate is poly(trimethylene ethylene urethane)
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HN (CH2)6 NHCO (CH2)8 CO
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Poly(hexamethylene sebacamide) IV
O CH2CH2
Poly(ethylene terephthalate) V O CH2CH2CH2 OCONH CH2CH2 NHCO
Poly(trimethylene ethyleneurethane) VI
A suggestion was made to name condensation polymers synthesized from two different monomers by following the pre x poly with parentheses enclosing the names of the two reactants, with the names of the reactants separated by the term -co-. Thus, the polymer in Eq. 1-7 would be named poly(phenol-co-formaldehyde). This suggestion did not gain acceptance. 1-2c IUPAC Structure-Based Nomenclature System
The inadequacy of the preceding nomenclature systems was apparent as the polymer structures being synthesized became increasingly complex. The IUPAC rules allow one to name
INTRODUCTION
single-strand organic polymers in a systematic manner based on polymer structure (IUPAC, 1991, 1994, 2002, in press; Panico et al., 1993; Wilks, 2000). Single-strand organic polymers have any pair of adjacent repeat units interconnected through only one atom. All the polymers discussed to this point and the large majority of polymers to be considered in this text are single-strand polymers. Double-strand polymers have uninterrupted sequences of rings. A ladder polymer is a double-strand polymer in which adjacent rings have two or more atoms in common, for example, structure VII. Some aspects of double-strand polymers are considered in Secs. 2-14a and 2-17d.
The basis of IUPAC polymer nomenclature system is the selection of a preferred constitutional repeating unit (abbreviated as CRU). The CRU is also referred to as the structural repeating unit. The CRU is the smallest possible repeating unit of the polymer. It is a bivalent unit for a single-strand polymer. The name of the polymer is the name of the CRU in parentheses or brackets pre xed by poly. The CRU is synonymous with the repeating unit de ned in Sec. 1-1a except when the repeating unit consists of two symmetric halves, as in the polymers 2 CH2 and CF2 CF2 The CRU is CH2 and CF2, respectively, ( CH )n ( . )n for polyethylene and polytetra uoroethylene, while the repeating unit is CH2 CH2 and CF2 CF2, respectively. The constitutional repeating unit is named as much as possible according to the IUPAC nomenclature rules for small organic compounds. The IUPAC rules for naming single-strand polymers dictate the choice of a single CRU so as to yield a unique name, by specifying both the seniority among the atoms or subunits making up the CRU and the direction to proceed along the polymer chain to the end of the CRU. A CRU is composed of two or more subunits when it cannot be named as a single unit. The following is a summary of the most important of the IUPAC rules for naming single-stand organic polymers: 1. The name of a polymer is the pre x poly followed in parentheses or brackets by the name of the CRU. The CRU is named by naming its subunits. Subunits are de ned as the largest subunits that can be named by the IPUAC rules for small organic compounds. 2. The CRU is written from left to right beginning with the subunit of highest seniority and proceeding in the direction involving the shortest route to the subunit next in seniority. 3. The seniority of different types of subunits is heterocyclic rings > heteroatoms or acyclic subunits containing heteroatoms > carbocyclic rings > acyclic subunits containing only carbon. The presence of various types of atoms, groups of atoms, or rings that are not part of the main polymer chain but are substituents on the CRU do not affect this order of seniority. 4. For heterocyclic rings the seniority is a ring system having nitrogen in the ring > a ring system having a heteroatom other than nitrogen in the order of seniority de ned by rule 5 below > a ring system having the greatest number of heteroatoms > a ring system having the largest individual ring > a ring system having the greatest variety of heteroatoms > a ring system having the greatest number of heteroatoms highest in the order given in rule 5. 5. For heteroatom(s) or acyclic subunits containing heteroatom(s), the order of decreasing priority is O, S, Se, Te, N, P, As, Sb, Bi, Si, Ge, Sn, Pb, B, Hg. (Any heteroatom