Compatibilization effect of poly(ε-caprolactone)-b-poly(ethylene glycol) block copolymers and phase morphology analysis in immiscible poly(lactide)/poly(ε-caprolactone) blends
Compatibilization effect of poly(ε-caprolactone)-b-poly(ethylene glycol) block copolymers and phase morphology analysis in immiscible poly(lactide)/poly(ε-caprolactone) blends
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DOI：
10.1021/bm020050r
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发表时间：
2002-11-01
影响因子：
6.2
通讯作者：
Inoue, Y
中科院分区：
文献类型：
--
作者：
Na, YH;He, Y;Inoue, Y
用差示扫描量热法（DSC）研究了两种立体异构体形式的聚（丙交酯）(PLA：聚（l -丙交酯）（PLLA）和聚（dl -丙交酯）（PDLLA）与聚（epsilon-己内酯）-b-聚乙二醇（PCL-b-PEG）和pcl -b-单氧氧基- peg （PCL-b-MPEG）嵌段共聚物的共混性和相行为。两种共混体系的DSC热行为表明PLA与PCL-b-(M)PEG的PEG段相可混溶，但与PCL段相仍不混溶，尽管PCL与PEG进行了嵌段共聚。在此基础上，将PCL-b- peg作为增容剂加入到PLA/PCL二元共混体系中。在PLA/PCL共混物中加入PCL-b- peg后，力学性能得到了预期的改善。此外，还进行了原子力显微镜（AFM）测量，以研究在机械测试中观察到的成分协同作用。AFM对共混物组成形态依赖的观察表明，PLA/PCL共混物在一定程度上是不混相的，但在一定程度上是相容的，在明显相分离和粗化之前，共混比的增容作用可能最大。
The miscibility and phase behavior of two stereoisomer forms of poly(lactide) (PLA: Poly (L-lactide) (PLLA) and poly(DL-lactide) (PDLLA)) blends with poly(epsilon-caprolactone)-b-poly(ethylene glycol) (PCL-b-PEG) and PCL-b-monomethoxy-PEG (PCL-b-MPEG) block copolymers have been investigated by differential scanning calorimetry (DSC). The DSC thermal behavior of both the blend systems revealed that PLA is miscible with the PEG segment phase of PCL-b-(M)PEG but is still immiscible with its PCL segment phase although PCL was block-copolymerized with PEG. On the basis of these results, PCL-b-PEG was added as a compatibilizer to PLA/PCL binary blends. The improvement in mechanical properties of PLA/PCL blends was achieved as anticipated upon the addition of PCL-b-PEG. In addition, atomic force microscopy (AFM) measurements have been performed in order to study the compositional synergism to be observed in mechanical tests. AFM observations of the morphological dependency on blend composition indicate that PLA/PCL blends are immiscible but compatible to some extent and that synergism of compatibilizing may be maximized in the compositional blend ratio before apparent phase separation and coarsening.