Interchain copolymerization

Interchain Copolymerization. This is a reaction between two Or more polymers to form a eopolymer. This type of reaction often involves the... 

Bulk polymerizations, such as addition (free-radical- and ionic-based) and step-growth types. Grafting polymerization by small molecules. Interchain copolymer formation, based on chain cleavage, graft copolymerization, and end-group block copolymerization. 

Copolymerization of AOCp with N-vinylpyrrolidone was found to be complicated because of the low solubility of the resulting copolymers. This problem is thought to arise from strong interchain H-bonding between the two comonomer units. However, the copolymerization experiments could be carried out satisfactorily by using H-bond breaking solvents such as dimethylform-amide (DMF) or dimethylsulfoxide (DMSO). 

Belokon and co-workers (50,51) attributed their template effects (see "Distance Accuracy of Two Functional Groups") to the existence of cyclopolymerization, since polymers of low crosslinking also showed a good selectivity. What takes place is an intrachain reaction rather than an interchain one. Only in one case have we observed a similar behavior (23,49,52). In our case a cyclo-polymerization was proved by copolymerization of 3.4-0-isopropylidene-D-mannitol 1, 2,5,6-bis-O-[(4-vinylphenyl)... 

Random copolymerization of aliphatic monomers develops elastomeric or rubbery nylons by reducing interchain attractions and lowering the decree of crystallinity by destruction of chain r ularity. Random copolymerization of ahphatic monomers generally decreases both meehanieal and thermal properties of nylorts but, in some cases, it allows rubber-like behavior in the copolymer. 

To obtain water-insoluble sorbitol copolyesters, 1,8-octanediol was used in place of a fraction of sorbitol in the monomer feed. Adipic acid, 1,8-octanediol, and sorbitol were copolymerized in the molar ratio 50 35 15 (Table 1, entry 2). The methanol-insoluble product had an Mw of 1.17x10. The solubility in water and THF of entry 1 and 2 products, respectively, is direct proof that they have few interchain crosslinks. Furthermore, 0.6- 1.0% w/v solutions of the products passed through 0.45 Um filters with complete recovery of the products which demonstrates the absence of microgels. This was shown by the fact that 99.9%wt of polymer was recovered when a known concentration of polymer solution was passed through the filter and the solvent was evirated. 

Vinylidene fluoride, 1,1-difluoroethene, (V) readily forms both homopolymers and copolymers, the homopolymers being non-elasto-meric. When copolymerized with such monomers as hexafluoropropy-lene (VI), chlorotrifluoroethylene (VII) and 1-hydropentafluoropropy-lene (VIII) the chain regularity is broken up and crystallization cannot occur. Since the interchain forces are low and the chains are reasonably flexible the copolymers cited have T,s below room temperature and the polymers are rubbery ... 

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