Copolymer isolation

Second example was obtained from the copolymerization initiated with starch. The results were shown in Fig. 12. The copolymer isolated from the monomer phase was produced by the thermal polymerization and the composition curve was completely similar to the ordinary curve of the radical copolymerization product. The copolymer isolated from the water phase differed from the usual copolymer. The upper curve indicated that the HA formed by starch were soft, and soft MMA was much more easily incorporated than hard St. 

Nakagami, T. and Yokota, T. (1981b). The characteristics of copolymers isolated from reaction products between methacrylated wood and styrene. Mokuzai Gakkaishi, 27(1), 32-38. 

For example, the (salen)Co(III) catalysts depicted in Figs. 11 and 12 have been isolated with concomitant purified copolymer by filtration of the polymerization solution through a short pad of silica gel (230-400 mesh) resulting in the metal catalyst being trapped on the pad and the copolymer solution eluted [33]. The (salen)Co(III) catalyst was recovered from the silica gel pad upon solubilization with a methanol solution of NaBF4. In this manner, the separated catalyst could be reused without significant loss in catalytic activity and the copolymer isolated with a metal residue of only 1-2 ppm. 

We attribute the lower P value obtained for shortest copolymer to the much reduced amplitude of the A term as compared to that of other copolymers. This is due to different morphology of PI anchoring diblocks at the surface as suggested above (Fig. 42). PI diblocks start to overlap for the critical areal density oc= a2/(7tRg2(PI))=2.10 2. For densities lower than oc, i.e., for long and intermediate copolymers, isolated PI patches are expected at PS surface and hence larger amplitude of the A term is anticipated. On the contrary, continuous PI pancake and reduced A is predicted for shorter diblocks segregating with o>oc. 

Several TADs have also been studied as low-temperature modifiers of dienic polymers, especially butadiene homo- and copolymers. Isolated double bonds in these polymers react in the same sense as in the ene reaction (Scheme 90) to give urazole-substituted polymers 519 (79MI3). Depend-... 

Thus, when sequential polymerization of q clic acetals was performed by introducing DXP into a solution of living polyDXL or vice versa, the copolymer isolated after longer reaction times showed DXL-DXL/DXL-DXP/DXP-DXP dyad distribution (determined by NMR) in ratios of 1 2 1, characteristic of random copolymers. When copolymerization was terminated after shorter reaction times, the proportion of heterodyads was lower, but at no stage of copolymerization could pure block copolymer be isolated. 

The thermal properties of the SCL-MCL PHA copolymer isolated from recombinant E. coli harboring the pTrcFabH(F87T) and pBBRGEC plasmids were determined by differential scanning calorimetry (DSC) analysis and compared with the thermal properties of P(3HB) homopolymer. All data were determined from the endotherm profiles (Figure 4). 

Fractionation of NPE and AE into their homologs APE from esters, ethoxylated esters, and EO/PO copolymers Isolation of APE from water Isolation of APE from water... 

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