Selective Molecular Permeability Induced by Glass Transition Dynamics of Semicrystalline Polymer Ultrathin Films
Selective Molecular Permeability Induced by Glass Transition Dynamics of Semicrystalline Polymer Ultrathin Films
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DOI：
10.1021/ma302081e
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发表时间：
2013-01-22
期刊：
影响因子：
5.5
通讯作者：
Takeoka, Shinji
中科院分区：
文献类型：
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作者：
Fujie, Toshinori;Kawamoto, Yuko;Takeoka, Shinji
大多数聚合物在玻璃化转变温度 (;) 以下固化，这对于聚合物材料的制造很重要。聚合物的玻璃化转变动力学 (GTD) 改变了它们的物理特性，从而改变了适合特定材料的应用范围。在这方面，大多数GTD研究都是针对非晶态聚合物体系的热力学，而对于半晶态聚合物的研究却很少。在这里，我们重点研究聚（L-乳酸）（PLLA）等半晶聚合物的玻璃态和结晶特性，并设想通过 GTD 过程中缠绕在准二维界面中的聚合物链的热力学重排来控制独立式 PLLA 超薄膜（称为“PLLA 纳米片”）的纳米结构。 PLLA 纳米片的退火过程（
Most polymers solidify below a glass transition temperature (;), which is important for the fabrication of polymeric materials. The glass transition dynamics (GTD) of polymers alters their physical properties and therefore the range of applications suitable for the particular materials. In this regard, most GTD studies were oriented to the thermodynamics of amorphous polymer systems, while little studies were known for semicrystalline polymers. Here, we focus on the glassy and crystalline properties of semicrystalline polymers such as poly(L-lactic acid) (PLLA) and envisage to control the nanostructure of free-standing PLLA ultrathin films (referred as "PLLA nanosheets"), via thermodynamic rearrangement of polymer chains entangled in a quasi-two-dimensional interface during the GTD process. The annealing process on the PLLA nanosheets (