Stereo block copolymers of  L ‐ and  D ‐lactides | Zendy

Yui Nobuhiko | Zendy; Dijkstra Pieter J. | Zendy; Feijen Jan | Zendy

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Stereo block copolymers of L ‐ and D ‐lactides

Author(s) -

Yui Nobuhiko,

Dijkstra Pieter J.,

Feijen Jan

Publication year - 1990

Publication title -

die makromolekulare chemie

Language(s) - English

Resource type - Journals

ISSN - 0025-116X

DOI - 10.1002/macp.1990.021910303

Subject(s) - copolymer , differential scanning calorimetry , monomer , polymer chemistry , polymerization , lactide , chemistry , ring opening polymerization , polymer , materials science , organic chemistry , physics , thermodynamics

Sequential diblock copolymers composed of L ‐ and D ‐lactic acid residues were synthesized through a living ring‐opening polymerization of L ‐ and D ‐lactide initiated by aluminium tris(2‐propanolate). The composition of the block copolymers was varied by changing the reaction conditions and monomer over initiator ratio and confirmed by 1 H NMR analysis, molecular weight determination and optical rotation measurements. Molecular weights ranged from 1,3 to 2,0 · 10 4 with 1,2 < M̄ w / M̄ n < 1,4. Stereocomplex formation in all block copolymers was determined using differential scanning calorimetry showing melting temperatures of about 205°C.

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