Controlled ring-opening polymerization of ε-caprolactone promoted by "in situ" formed yttrium alkoxides

被引：137
作者：
Martin, E
Dubois, P
Jérôme, R
机构：
[1] Univ Liege, Ctr Educ & Res Macromol, B-4000 Liege, Belgium
[2] Univ Mons, Lab Polymer & Composite Mat, B-7000 Mons, Belgium
来源：
MACROMOLECULES | 2000年 / 33卷 / 05期
关键词：
D O I：
10.1021/ma991045r
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The ring-opening polymerization of epsilon-caprolactone has been initiated by [tris(hexamethyl-disilyl)amide]yttrium in the presence of an excess of 2-propanol. This initiating system is very active even at high alcohol-to-Ti molar ratio. Polymers with controlled molecular parameters (M-n, end groups) and low dispersity are formed as result of fast alkoxide/alcohol exchange. At molar excess of 2-propanol higher than 100, this exchange is no longer quantitative. The in situ formed active species involved in this new initiating system are different from those ones present in the commercial yttrium oxo-isopropoxide Y-5(mu-O)((OPT)-P-i)(13) cluster. Evidence is provided by H-1 NMR spectroscopy.
引用
收藏
页码：1530 / 1535
页数：6
相关论文
共 27 条
[1]  
AGARWAL S, 1998, POLYM PREPR AM CHEM, V39, P414
[2]   PENTANUCLEAR OXOALKOXIDE CLUSTERS OF SCANDIUM, YTTRIUM, INDIUM AND YTTERBIUM, X-RAY CRYSTAL-STRUCTURES OF [M5(MU5-O)(MU3-OPRI)4 (MU2-OPRI)4(OPRI)5] (M = IN, YB) [J].
BRADLEY, DC ;
CHUDZYNSKA, H ;
FRIGO, DM ;
HAMMOND, ME ;
HURSTHOUSE, MB ;
MAZID, MA .
POLYHEDRON, 1990, 9 (05) :719-726
[3]   Polymerization of ethylene oxide using yttrium isopropoxide [J].
Choi, YK ;
Stevels, WM ;
Ankone, MJK ;
Dijkstra, PJ ;
Kim, SW ;
Feijen, J .
MACROMOLECULAR CHEMISTRY AND PHYSICS, 1996, 197 (11) :3623-3629
[4]   REACTION OF (CP(2)ASTERISK-LNH)(2) (LN=Y, LA) AND CP(2)ASTERISK-Y(2-C(6)H(4)CH(2)NME(2)) WITH ESTERS AND AMIDES AND MOLECULAR-STRUCTURE OF [CP(2)ASTERISK-Y(MU-OCME=CHC(OET)O)](2) [J].
DEELMAN, BJ ;
WIERDA, F ;
MEETSMA, A ;
TEUBEN, JH .
APPLIED ORGANOMETALLIC CHEMISTRY, 1995, 9 (5-6) :483-490
[5]   MACROMOLECULAR ENGINEERING OF POLYLACTONES AND POLYLACTIDES .4. MECHANISM AND KINETICS OF LACTIDE HOMOPOLYMERIZATION BY ALUMINUM ISOPROPOXIDE [J].
DUBOIS, P ;
JACOBS, C ;
JEROME, R ;
TEYSSIE, P .
MACROMOLECULES, 1991, 24 (09) :2266-2270
[6]   POLYMERIZATION OF EPSILON-CAPROLACTONE INITIATED BY ALUMINUM ISOPROPOXIDE TRIMER AND/OR TETRAMER [J].
DUDA, A ;
PENCZEK, S .
MACROMOLECULES, 1995, 28 (18) :5981-5992
[7]   Polymerization of epsilon-caprolactone initiated by aluminum isopropoxide carried out in the presence of alcohols and diols. Kinetics and mechanism [J].
Duda, A .
MACROMOLECULES, 1996, 29 (05) :1399-1406
[8]   SOLUBLE BIMETALLIC MU-OXOALKOXIDES .7. CHARACTERISTICS AND MECHANISM OF RING-OPENING POLYMERIZATION OF LACTONES [J].
HAMITOU, A ;
OUHADI, T ;
JEROME, R ;
TEYSSIE, P .
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1977, 15 (04) :865-873
[9]   MACROMOLECULAR ENGINEERING OF POLYLACTONES AND POLYLACTIDES .5. SYNTHESIS AND CHARACTERIZATION OF DIBLOCK COPOLYMERS BASED ON POLY-SIGMA-CAPROLACTONE AND POLY(L,L OR D,L)LACTIDE BY ALUMINUM ALKOXIDES [J].
JACOBS, C ;
DUBOIS, P ;
JEROME, R ;
TEYSSIE, P .
MACROMOLECULES, 1991, 24 (11) :3027-3034
[10]  
JEDLINSKI Z, 1991, MAKROMOL CHEM, V192, P2051
123