Basis polymers

On this basis polymers may be classified as (i) addition polymers and (ii) condensation polymers. 

ISO. International Standard ISO 1043 1986. Plastics - Symbols and Codes - Part 1 Symbols for basie polymers and their modifieations, and for plasticizers. 

The basis polymer of the complex, which was suspended in hydrocarbon media, was prepared from poly(N-benzoyl ethylendmine) by acid-catalyzed hydrolysis and had a molecular mass of 105. The methyl derivative of LPEI was obtained by reductive IV-methylation and used for the preparation of the complex. The reduction procedure was shown to be successful for aldehydes, ketones, and esters. For several reductions, e.g. diphenylmethanol, benzyl alcohol, 2-methyl-1-propan-ol, they reported degrees of conversion of 100% according to NMR assay. 

This ambivalent interaction behaviour can be explained by the multifunctional structure of this PEI derivative. On the one hand, the divalent metal ions can interact with the nitrogen atoms of the amino groups of the basis polymer, and one the other hand, the methylated moieties lead to an anion exchange character of the polymer. Thus, simultaneous complexation and retention of various elements are feasable with this polymer. 

The polyamines and a series of other polymers can serve as basis polymers and easily derivatized with different ligands. Some examples are given in Table 1. 

TABLE 1. Different examples of basis polymers with ligands derived from polyamines. 

TABLE 2. Metal selectivity series for some basis polymers. PEI, poly(ethylenimine) (PEI) PTU, thiourea derivative of PEI PDA, diamino acetic acid derivative of PEI POX, oxine derivative of PEI. 

The polymer reagents for the remediation process in the aqueous phase are called polychelatogens. They consist of water-soluble polymers and have been investigated and reviewed extensively. By using different basis polymers and chelating moieties a great variety of polymer reagents with selectivities for many different metal ions can be provided. ... 

Use Level 2-5 Ib/100 gal latex paint 0.01 % on wet basis (polymer stripping), 0.01-1% vol. basis (water-reducible and resin emulsion coatings) Storage 1-2 mos storage stability under normal conditions if settling occurs, use mild agitation before use stored at or below freezing, vise, will increase and some phase separation may occur Drewplus L-477 [Ashland/Drew Ind. Div.)... 

SFS-EN ISO 1043-1 Plastics. Symbols and abbreviated terms. Part 1 Basie polymers and their special... 

Leikin AY, Rusanov AL, Begunov RS, Fomenkov AI (2009) Synthesis and properties of poly [2-(4 -oxyphenylene)-5- benzimidazole] and a proton-exchange membrane produced on its basis. Polym Sci SerC 51 12-16... 

Thermodynamic Basis Polymer solutions exhibit osmotic pressures because the chemical potentials of the pure solvent and the solvent in the solution are unequal. Because of this inequality, there is a net flow of solvent, through a connecting membrane, from the pure solvent side to the solution side. When sufficient pressure is built up on the solution side of the membrane, so that the two sides have the same activity, equilibrium will be restored (24). 

If there is a functional basis polymer available which meets the requirements of attachment in terms of the functional group, the polymer support can be used without further modification. The introduction of an anchor group permits, in addition, the alteration of the polymer-peptide bond. This provi a greater flexibility for the selection of side-chain protecting groups. As there is a special section dedicated to this topic, no details are givoi here. 

Table 2. Synthetic basis polymers ftir liquid-pliase repetitive-type ntlKss...

Apart from basis polymers, such as poly(vinyl alcohol), which contain already the functional group for attaching the first nucleoside, the polymer has to be derivatized in many cases in order to obtain the suitably functionalized support [31, 126, 134, 13S]. For the selection of the appropriate functional group, one has to consider that the bond between the port and the oligonucleotide must be resistant to cleavage during the repetitive synthesis. In addition, the same bond should be cleavable at the end of synthesis without... 

A series of different polymers have been described for this purpose, however, it seems that some basis polymers are strongly preferred. Among these are mainly polymers containing t ckbones of polystyrene or poly(oxyethylene)L In general, many of these supports provide condensation yields similar to those in conventional, non-supported synthesis in the homogeneous phase. 

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