Poly branched

Simon, P.F.W., Muller, A.H.E., and Pakula, T. Characterization of highly branched poly(methyl methacrylate) by solution viscosity and viscoelastic spectroscopy. Macromolecules, 34, 1677, 2001. 

Scheme 2. General route to branched poly(acrylic acid) via SCVCP, followed by hydrolysis...

Highly branched poly(methacryhc acid) was synthesized by SCVCP of tert-butyl methacrylate with the inimer 12 via GTP, followed by hydrolysis [28]. Acid-catalyzed hydrolysis of the ferf-butyl groups and neutralization with NaOH produced a water-soluble, highly branched poly(sodium methacrylate). 

Elastomeric networks with junction functionalities ranging from 4 to 70 were prepared by endlinking a,u)-divinyl poly(dimethylsiloxane) chains having number average molecular weights ranging from 8,800 to 55,300 with polyfunctional junctions provided by linear and branched poly(methylhydrogensiloxanes). 

Branching index, 79 839 branch-poly-(n-b ityl acrylate), 7 610t Brass, 7 753... 

The synthesis of well-defined LCB polymers have progressed considerably beyond the original star polymers prepared by anionic polymerization between 1970 and 1980. Characterization of these new polymers has often been limited to NMR and SEC analysis. The physical properties of these polymers in dilute solution and in the bulk merit attention, especially in the case of completely new architectures such as the dendritic polymers. Many other branched polymers have been prepared, e.g. rigid polymers like nylon [123], polyimide [124] poly(aspartite) [125] and branched poly(thiophene) [126], There seems to be ample room for further development via the use of dendrimers and hyperbran-... 

Choi J, Kim I-K, Kwak C-Y (2005) Synthesis and characterization of a series of star-branched poly( -caprolactone)s with the variation in arm numbers and lengths. Polymer 46 9725-9735... 

Fig. 12.1.2 Absorbance changes of the suspension (0.1 wt%) containing monodisperse colloidal silica modified with irontlll-bipyridyl-branched poly((V-isopropylacrylamide). (From Ref. 50.)...

A statistical calculation was carried out and the calculated value of x at saturation (0.63) was nearly equal to the experimental value of x2 The profile for the BPEI-Co(III) complex was considered to be as in Fig. 2(b), with the Co(III) chelates coordinated preferentially to the end primary amine groups of the branched poly(ethyleneimme)4. ... 

Fig. 2. Conformational profiles of polymer-Oo(IIl) complex poly(vinylpyridine)-Co(III) complex (a) and branched poly(ethyleneimine)-Co(IlI) complex (b)...

PVP = poly(4-vinylpyridine), BPEI = branched poly(ethyleneimine), PLL = poly(L-lysine). aP i/2 is the pressure at which one-half of the complex has reacted with molecular oxygen, b The [PLL)/[heme] ratio is changed from 7 to 10 or 50. 

Like the rules discussed above, the Stockmayer-Fixman rule assumes that g is a function of g0 independent of the type of branching present. This rule gave estimates of the branching parameters for branched poly(vinyl acetate) and cross-linked polystyrene in good agreement with those derived from kinetic studies and molecular weights respectively. 

Binding behavior of transition metal ions with polyallylamine20), poly(e-A-methacryloyl-L-lysine)2,), branched poly(ethyleneimine)s 22), water soluble polymer-bound iminodiacetic acid analogue 23), and polyacrylamide gel 241 has been reported. In these works, the effect of the polymer backbone has been discussed in terms of interaction of metal ions with the polymer chains. 

Chelating properties of linear and branched poly(ethyleneimine)s, LPEI (5) and... 

Reversible oxygen binding has also been examined using poly(ethyleneimine)-cobalt complexes in aqueous solution. Cobalt(II) complexes of linear and branched poly(ethyleneimine) in aqueous solution are able to form with oxygen a p-peroxo adduct as is evidenced from stoichiometry and spectral properties 107). 

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