Tailoring Onion-Like Morphology in Polylactide-Containing Block Copolymers
Polylactide (PLA) has long been used for biomedical devices because of its excellent biodegradability and bioresorbability.1,2 In 1987, Ikada et al. Reported stereocomplexation between enantiomeric PLAs, namely, poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA).3 The stereocomplex formation results in a higher melting point (ca. 50 °C higher), higher mechanical strength, and improved thermal and hydrolytic stability. However, there have been only limited studies on incompatible PLLA-and PDLA-containing diblocks and their stereocomplexes.4 In this work, we have systematically investigated the phase behavior and morphology of poly(ethylene oxide)-b-PLA (PEO-b-PLA) and poly(ethylene-co-1,2-butylene)-b-PLA (PEB-b-PLA) diblock copolymers and their 1:1 molar blends. By varying the molecular weights of immiscible PEO and PEB blocks, we observed intriguing morphology in stereocomplexes grown from the melt.
Lu Sun Weiqiang Cao Lixia Rong Benjamin S. Hsiao Lei Zhu
Polymer Program,Institute of Materials Science and Department of Chemical,Materials and Biomolecular Chemistry Department,Stony Brook University,Stony Brook,NY 11794
国际会议
5th East-Asian Polymer Conference(第5届东亚高分子学术研讨会)
上海
英文
116-117
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）