Ring-opening polymerization of -caprolactone (CL) has been initiated with rare earth phenyl compounds in both bulk and solution. These rare earth phenyl initiators can give polycaprolactone (PCL) with high yield and high molecular weight. The polymerization mechanism is through a coordination-deprot
Polymerization of Lactides and Lactones, 8. Study on the Ring-Opening Polymerization of 3-Phenyl-ε-caprolactone and 5-Phenyl-ε-caprolactone
✍ Scribed by Xianmo Deng; Minglong Yuan; Xiaojun Cao; Xiaohong Li
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 151 KB
- Volume
- 202
- Category
- Article
- ISSN
- 1022-1352
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Ring-opening polymerization of lactone and lactide have been initiated with rare earth organoacid compounds, such as lanthanum acetate in bulk. The polymerization mechanism is in agreement with the "nonionic-coordination-insertion" mechanism, which involves the selective cleavage of the acyl-oxygen
DSC thermogram of P(DX-b-CL) obtained after a polymerization time of 3.8 h (A) and 39.9 h (B) (see Tab. 2; heating rate: 10 8C/min under N 2 flow, 2 nd scan). much indebted to F.R.I.A. (Fonds pour la Formation a `la Recherche dans l'Industrie et dans l'Agriculture).
Time dependence of the yields in c-acryloyloxyethyl-c-butyrolactone and poly(c-acryloyloxy-e-caprolactone) in toluene at 0 8C. Conditions: [ACL] 0 = 1 m, [ACL] 0 /[Al(O i Pr) 3 ] 0 = 50 (ACL: c-acryloyloxy-e-caprolactone). Scheme 1.
Ring-opening polymerization of DL-lactide (LA) has been initiated with the ( 3 -C 3 H 5 ) 2 Sm( 2 -Cl) 2 ( 3 -Cl) 2 Mg(tmed)( 2 -Cl)Mg(tmed) complex both in bulk and solution. The effects of reaction conditions, such as reaction time, reaction temperature, and monomer/initiator molar ratio on the po