Lactones polycaprolactone

Controlled block copolymerization of olefins with polar monomers was performed with a lanthanide complex by the successive polymerization of hexene (or pentene) and methylmethacrylate (or caprolactone). Polyhexene-block-poly(methyl methacrylate), polyhcxcnc-fo/ock-polycaprolactone, poly-pentene-fc/ock-poly(methyl methacrylate), and polypentene-Wock-polycapro-lactone were synthesized using a lanthanide complex as initiator [140-143]. 

The most direct way of looking at the specific interactions is by using spectroscopic measurements. Infra-red spectroscopy is the technique which has been most commonly used to study mixtures involving polymers. Studies of blends of PVC with polycaprolactone showed shifts of 4-6 cm in the carbonyl band of polycapro-lactone relative to the pure polymer but this Figure should be treated with... 

The extruder can be used for a variety of polymerizations even if no preformed polymer is present.89 These include the continuous anionic polymerization of caprolactam to produce nylon 6,90 anionic polymerization of capro-lactone 91 anionic polymerization of styrene 92 cationic copolymerization of 1,3-dioxolane and methylal 93 free radical polymerization of methyl methacrylate 94 addition of ammonia to maleic anhydride to form poly(succin-imide) 95 and preparation of an acrylated polyurethane from polycaprolactone, 4,4 -methylenebis(phenyl isocyanate), and 2-hydroxyethyl acrylate.96 The technique of reaction injection molding to prepare molded parts is slightly different. Polyurethanes can be made this way by... 

The most direct way of looking at the specific interactions is by using spectroscopic measurements. Infra-red spectroscopy is the technique which has been most commonly used to study mixtures involving polymers. Studies of blends of PVC with polycaprolactone showed shifts of 4-6 cm 1 in the carbonyl band of polycapro-lactone relative to the pure polymer 99 l00), but this Figure should be treated with caution as the peak probably consists of the sum of a shifted and an unshifted peak and it is difficult to say what the frequency of the shifted peak would be, or what fraction of the carbonyl groups are, or can be, involved in the interaction. Frequency shifts have also been shown to exist in blends of poly(methyl methacrylate) with poly(vinylidene fluoride)63). 

Polycaprolactone (PCL) is obtained by ring-opening polymerization of the six-membered lactone, e-caprolactone (Figure 30.4f), which yields a semicrystalline polymer with a melting point of 59°C-64°C and a glass transition temperature of 60°C with great organic solvent solubility. Anionic, cationic, coordination, or radical polymerization routes are all applicable for synthesis. " " " ... 

Uyama and co-workers [126,127] utilised PFL in the single-step ROP of DDL and acylation of hydroxy termini with different vinyl esters to produce polymers containing polymerisable groups only at one terminus of the polymer chain. Kobayashi and coworkers [128] have reported that the lipase-catalysed (CAL and PCL) polymerisation of lactones (12-, 13- and 16-membered), divinyl esters of adipic and sebacic acid and a,(o-glycols using one-pot synthesis produced the corresponding ester copolymers in which two different types of polymerisation, ROP and polycondensation as well as transesterification, simultaneously occurred via the same enzyme intermediate to provide random copolymers. Polymerisation of macrolides (DDL and PDL) in the presence of preformed polyester (polycaprolactone) produced the corresponding copolyesters [129]. 

---