Early Stage Interplay of Microphase Separation and Crystallization in Crystalline−Coil Poly(l-lactic acid)-block-polystyrene Thin Films
Early Stage Interplay of Microphase Separation and Crystallization in Crystalline−Coil Poly(l-lactic acid)-block-polystyrene Thin Films
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DOI：
10.1021/ma0483219
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发表时间：
2005-05
期刊：
影响因子：
5.5
通讯作者：
Jun Fu;Bingyu Luan;C. Pan;Bin-yao Li;Yanchun Han
中科院分区：
文献类型：
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作者：
Jun Fu;Bingyu Luan;C. Pan;Bin-yao Li;Yanchun Han
研究了结晶-卷曲聚（l-乳酸）-嵌段-聚苯乙烯（PLLA-b-PS）二嵌段共聚物非晶薄膜退火初期微相分离和结晶的相互作用。在PS的玻璃化转变温度（TgPS）和PLLA的熔点（TmPLLA）之间的温度下对均匀和非均匀的薄膜进行退火，以便同时发生微相分离和结晶。(1)均匀的膜形成类似旋节线的图案，振幅放大到片层间距（L0），表明微相分离和共聚物链相对于表面和基底的垂直取向。之后，异常浮雕结构（域II，高度约30 nm）开始在原始浮雕图案（域I）内横向生长。表面波矢q随时间t衰减为q <$t-1/3，而畴Ⅱ的增长可用Avrami方程描述，其中ε = 1。
The interplay of microphase separation and crystallization has been investigated at the early stage of annealing the amorphous thin films of the crystalline−coil poly(l-lactic acid)-block-polystyrene (PLLA-b-PS) diblock copolymer. The homogeneous and heterogeneous films were annealed at the temperatures between the glass transition temperature of PS (TgPS) and the melting point of PLLA (TmPLLA) so that the microphase separation and crystallization were simultaneously possible. (1) The homogeneous films formed spinodal-like pattern, with the amplitude amplified to the lamellar spacing (L0), indicating the microphase separation and perpendicular orientation of the copolymer chains with respect to the surface and substrate. Afterward, abnormal relief structures (domain II, ∼30 nm in height) started and grew laterally within the original relief patterns (domain I). The surface wavevector q decayed with the time t as q ∼ t -1/3, while the growth of domain II could be described by the Avrami equation with the e...