Condensation polymer

Summary

In polymer chemistry, condensation polymers are any kind of polymers whose process of polymerization involves a condensation reaction (i.e. a small molecule, such as water or methanol, is produced as a byproduct). Condensation polymers are formed by polycondensation, when the polymer is formed by condensation reactions between species of all degrees of polymerization, or by condensative chain polymerization, when the polymer is formed by sequential addition of monomers to an active site in a chain reaction. The main alternative forms of polymerization are chain polymerization and polyaddition, both of which give addition polymers. Condensation polymerization is a form of step-growth polymerization. Linear polymers are produced from bifunctional monomers, i.e. compounds with two reactive end-groups. Common condensation polymers include polyamides, polyacetals, and proteins. Polyamides One important class of condensation polymers are polyamides. They arise from the rea

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In this paper, we describe a novel methodology for fabricating conductive epoxy-polythiophene network films by simultaneous photoinduced step-growth and cationic ring opening polymerization processes. For this purpose, formulations containing a bifunctional epoxy monomer, namely 1,6-hexanediol diglycidyl ether (HDGE) and different amount of thiophene ranged from 0 to 50 wt% in the presence of an iodonium salt, namely (4-methylphenyl)[4-(2-methylpropyl) phenyl]-iodonium, hexafluorophosphate were irradiated under UV light. In the process, while polythiophene was formed through electron transfer reaction between photochemically formed phenyliodinium radical cations followed by proton release and coupling reactions, cationic ring opening polymerization of HDGE initiated by the liberated protons resulted in the formation of epoxy network. Conductivity of the obtained films was evaluated by surface resistivity measurements by means of a standard two-point micro-contact method before and after iodine doping. It was found that iodine doping provided a significant improvement in the surface conductivity. This work conclusively provides a new approach for bonding conducting polymers with epoxy-based network films via photoinduced electron transfer reactions in a simple, fast, and efficient approach of importance in electronic and other applications. (C) 2013 Elsevier Ltd. All rights reserved.

Elsevier Sci Ltd2013

Chain-Shattering Polymeric Therapeutics with On-Demand Drug-Release Capability

Liang Ma, Li Tang

Trigger happy: Trigger-responsive chain-shattering polymeric therapeutics (CSPTs) were prepared by condensation polymerization of a UV- or hydrogen peroxide-responsive domain and a drug as co-monomers. Drug release can be started and stopped by starting and stopping the trigger treatment. Chemotherapeutic-containing CSPTs showed trigger-responsive in vitro and in vivo antitumor efficacy.

Wiley-Blackwell2013

Protein mimetics (TASP) by sequential condensation of peptide loops to an immobilised topological template

The sequential condensation of peptide loops onto selectively addressable templates immobilised on solid supports allows the rapid and efficient synthesis of protein mimetics applying the TASP (Template Assembled Synthetic Protein) concept. As an example of the versatility of this methodology, we describe here the solid phase assembly of a representative 3-loop receptor mimetic. (C) 1997 Elsevier Science Ltd.

1997