Caprolactone . See

Caprolactone. See c-Caprolactone monomer 5-Caprolactone. See 5-Hexalactone e-Caprolactone. See c-Caprolactone monomer y-Caprolactone. See y-Hexalactone Caprolactone/dimethylsiloxane/caprolactone block copolymer CAS 120359-07-1 Classification Carbinol-terminated polydimethylsiloxane... 

A two-step degradation mechanism for pofycaprolactone has been proposed by Persenaire et al. [42], They studied thermal degradation of PCL by high resolution thermogravimetric analysis (TGA) simultaneously coupled with mass spectrometry (MS) arrd Forrrier transform infrared spectrometry (FTIR). Based on evolved gas analysis by both MS and FTIR it was concluded that the first step was a random rupture of polyester chains via cw-elimination reaction which produced H2O, CO2, and 5-hexanoic acid. The second step is an unzipping depolymerization process at the chain ends with hydroxyl end groups to form e-caprolactone (see Fig. 4.2). 

More recently [ 11 ], for a blend of SAN and poly s-caprolactone (see blend 10 in Table 1 for details), no shear-induced de-mixing was observed. However, only one measurement at one shear rate and one temperature within the one-phase region (10 °C below the phase boundary) was reported, and since shifts are often by smaller amounts this result is far from conclusive. 

Poly(co-caprolactone), see Poly(oxy( 1 -oxohexamethylene) Poly(diethylene glycol- l,4-trani -cyclohexanedicarboxylate) ... 

Calderon classical catalyst system, 457 CAPA. See Poly(e-caprolactone) (CAPA, PCL)... 

See also PBT degradation structure and properties of, 44-46 synthesis of, 106, 191 Polycaprolactam (PCA), 530, 541 Poly(e-caprolactone) (CAPA, PCL), 28, 42, 86. See also PCL degradation OH-terminated, 98-99 Polycaprolactones, 213 Poly(carbo[dimethyl]silane)s, 450, 451 Polycarbonate glycols, 207 Polycarbonate-polysulfone block copolymer, 360 Polycarbonates, 213 chemical structure of, 5 Polycarbosilanes, 450-456 Poly(chlorocarbosilanes), 454 Polycondensations, 57, 100 Poly(l,4-cyclohexylenedimethylene terephthalate) (PCT), 25 Polydimethyl siloxanes, 4 Poly(dioxanone) (PDO), 27 Poly (4,4 -dipheny lpheny lpho sphine oxide) (PAPO), 347 Polydispersity, 57 Polydispersity index, 444 Poly(D-lactic acid) (PDLA), 41 Poly(DL-lactic acid) (PDLLA), 42 Polyester amides, 18 Polyester-based networks, 58-60 Polyester carbonates, 18 Polyester-ether block copolymers, 20 Polyester-ethers, 26... 

Surfactants which contain carboxylic acid ester or amide chains with terminal phosphonic acid groups are prepared from polyhydroxystearic acid or poly-caprolactone. Such reaction products are useful as dispersants, emulsifiers, and, in some cases, bactericides, disinfectants, and antiseptics see Sec. III.C.9 [69]. 

Effect of 6- Caprolactone and Adipic Acid Molar Ratio for Copolyester III on the Hydrolysis by R. delemar Lipase. The hydrolysis of various copolymers by R. delemar lipase was exam ed to see whether there was an optimum chemical structure or not. Mn of those copolyesters was selected from 17 0 to 2220, to diminish the effect of molecular weight. Optimum molar ratio of e- caprolactone and adipic acid was about from 90 10 to 70 30 (Figure 5). The Tm at the optimum molar ratio was the lowest of all. So it seemed that the existence of optimum molar ratio came from the lowest Tm, which would show the most amorphous material, rather than the optimum chemical structure. 

Aldonolactones serve as suitable monomers for the generation of homo- and copolymers, especially through ring-opening polymerization (ROP). Among them are the carbohydrate-analogs of s-caprolactone, i.e., aldono-1,6-lactones. The first example of such derivatives and further ROP was reported by Galbis and co-workers [61], see also chapter, Synthetic polymers from readily available monosaccharides ... 

The single focal point of the dendrimer can be used to initiate the polymerization of monomer, e.g., of e-caprolactone [125] (see Scheme 15a). The efficiency of the [G-4]-OK initiator is 100%. The polymerization is essentially complete in 6 min at 0 °C. Experimental and calculated MWs agree and the MWD is narrow. At longer times, Mn remains constant but the MWD increases due to trans-... 

HPO-plus A process for making caprolactone, an intermediate in the manufacture of polyamides. An improved version of the cyclohexanone oximation process, which produces only a third as much of the byproduct ammonium sulfate. Developed by DSM and operated in Nanjing, China, from 2001. See also Altam. 

Some heterocycles have both nucleophilic and electrophilic atoms in their molecule. Thus they can be opened and polymerized by the anionic, cationic or coordination mechanisms. Examples are lactams, lactones, and cyclic siloxanes. Investigations of the mechanism of lactam propagation are complicated by the occurence of side reactions. In principle, the mechanism described in Chap. 3 by the schemes (55)—(57) and (71) is accepted. Anionic polymerization of cyclic esters consists, in most cases (see Chap. 4, Sect. 2.2) of repeated reversible attacks on the carbonyl carbon by the anion 0]-. From e-caprolactone, polyester chains grow according to [315]... 

Nonetheless, artificial biodegradable aliphatic polyesters are still mainly based on the industrial polymerization of monomers such as glycolic acid (PGA), lactic acid (PLA), and caprolactone (PCL). (See Figure 12.29). These polyesters are applied in implants, absorbable sutures, controlled-release packaging, and degradable films and moldings. 

Cationic organozinc compounds are expected to be good catalysts for ring opening polymerization reactions of epoxides and lactones because the enhanced Lewis acidity (see Lewis Acids Bases) of the zinc center favors its coordination to the monomer. For example, Walker and coworkers have found that the cationic zinc substituted cyclopentadienyl complex [3,5-Me2C6H3CH2CMe2C5H4Zn(TMEDA)]+ [EtB(C6F5)3] is an active initiator species for the polymerization of cyclohexene oxide and e-caprolactone. ... 

Recently, a series of works have been published on the cationic po merization of lactones (e.g. p-propiolactone and e-caprolactone ) and various ionic ecies have been reported together with elaborate kinetic treatments and some electrochemical measurements. In our opnion the chemical structure of the growing species in the cationic polymerization of lactones has not yet firmly been established (see also Ref. 190) and, therefore, a more detailed discussion of the% interesting and important systems must wait until these structures are known. 

The Baeyer-Villiger reaction is also effected by biochemical oxidation using the enzyme cyclohexanone oxygenase from Acinetobacter strain NCIB 9871. Cyclohexanone is thus converted into e-caprolactone [1043], and phenylacetone (l-phenyl-2-propanone) is transformed into benzyl acetate. The formation of benzyl acetate from phenylacetone involves the same migration as that in oxidation with peroxytrifluoroacetic acid (equation 387) [1034]. More examples of biochemical Baeyer-Villiger reactions occur in diketones and steroids see equation 397). 

Figure 18 Zirconium sulfonamidate complex for ring-opening polymerization of e-caprolactone and rac-lactide. Reproduced from [52f] with permission of American Chemical Society. (See insert for color/color representation of this figure)...

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