Stereo block copolymers of L‐ and D‐lactides
Open accessAbstract
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 < M̄w/M̄n < 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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Commercial PLLA has a specific optical rotation [α]D22 of −155 to −153° at 22 °C.
“The specific optical rotation of commercial PLLA is −155 to −153° at 22 °C.76,77”
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References 14 · Cited by 151
- Authors
- Yui, N., Dijkstra, P. J., & Feijen, J.
- Affiliations
- University of Twente (NL)
- Venue
- Die Makromolekulare Chemie
- Publisher
- Wiley
- Published
- 1990-03
- Volume
- 191
- Issue
- 3
- Pages
- 481-488
- ISSN
- 0025-116X (ISSN-L)
- OpenAlex
- W2145830371
- Cited by
- 151
- References
- 14
- Citations by year
- 2023: 4 · 2022: 8 · 2021: 1 · 2020: 6 · 2019: 7 · 2018: 5 · 2017: 5 · 2016: 11 · 2015: 10 · 2014: 11 · 2013: 7 · 2012: 11
- FWCI
- 1.90
- Type
- journal article
- Language
- en
- Open access
- green
- research.utwente.nl
- Licence
- Locations
- Die Makromolekulare Chemie (publishedVersion)
- University of Twente Research Information (submittedVersion, other-oa)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Keywords
- stereoblock copolymers, L-lactide, D-lactide, living ring-opening polymerization, stereocomplex formation, molecular weight distribution, melting point, polylactic acid
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