Sustainable polymerization

It is well known that polysaccharide cellulose is - in general - a very important and fascinating biopolymer and an almost inexhaustible and sustainable polymeric raw material. The trend towards renewable resources and the tailoring of innovative products for science, medicine, and technology has led to a global renaissance of interdisciplinary cellulose research and the use of this abundant organic polymer over the last decade [1]. 

Khan A, Benboubetra M, Sayyed PZ, Ng KW, Fox S, Beck G, Benter IF, Akhtar S (2004) Sustained polymeric delivery of gene silencing antisense ODNs, siRNA, DNAzymes and ribozymes in vitro and in vivo studies. J Drug Target 12(6) 393-404... 

A number of questions need to be resolved from the qualitative description of emulsion polymerization given in the previous section. For example, it is necessary to consider whether the diffusion of monomers to the polymer particles is high enough to sustain polymerization given the low solubdity of monomer in the aqueous phase. It is also important to know the average radical concentration in a polymer particle. Also, the validity of the assumption that only the monomer-polymer particles capture the radicals generated by the initiator needs to be established convincingly. The answers to these questions were pro vided by Smith and Ewart and this forms the basis for the quantitative treatment of the steady-state portion of emulsion polymerization. 

Tanghe, L., 2014. New sustainable Polymeric FRs for Textiles, paper presented at the 2nd International Congress on Fire Safe Textiles Plastics, 16-17 October 2014, Ghent,... 

Chromatography for Sustainable Polymeric Materials Renewable, Degradable and Recyclable Volume Editors Albertsson, A.-C., Hakkarainen, M. 

Plasticizers are substances (usually low molecular weight diluents) that are incorporated into polymeric materials to improve their workability and increase flexibility. The most important of these used in rubber adhesives are phthalates (see Environment sustainability), polymeric plasticizers, and esters. 

Polymerization studies have revealed interesting observations on the structure-activity relationships of this family of complexes. For example, the 2-methylallyl derivative is completely inert in contrast to the benzyl analog, implying that the more tightly bound allyl ligand does not provide the requisite open site around the Ni center. In addition, the a-iminoenamido derivatives require the presence of additional M(G6F5)3 (M = B or Al 2.5 equiv. with respect to Ni) to sustain polymerization, in contrast to the a-iminocarboxamidato derivatives that are single-component catalysts. On the other hand, the poly(ethylene) (PE) obtained from the latter systems have lower values. 

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