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      PLLA Morphology Controlled by Dry-cast Process

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          Abstract

          The influence of solvent evaporation rate, in the dry-casting process, on crystallinity and morphology of crystallizable polymeric membrane was studied. Poly-l-lactic acid (PLLA) was taken as an example. The membranes were characterized by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). By controlling the solvent evaporation rate, samples with various crystallinities were prepared. From higher to lower crystallinity the membranes exhibit three types of surface morphology in sequence: granule, stripe and smooth.

          Most cited references17

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          The Critical Role of Solvent Evaporation on the Roughness of Spin-Cast Polymer Films

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            Self‐assembly of a homopolymer mixture via phase separation

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              Mechanisms of Ordering in Striped Patterns

              We have studied the ordering dynamics of the striped patterns of a single layer of cylindrical block copolymer microdomains in a thin film. By tracking disclinations during annealing with time-lapse atomic force microscopy, we observe a dominant mechanism of disclination annihilation involving three or four disclinations (quadrupoles). Pairwise disclination annihilation events are suppressed as a result of the topological constraints in this system. The kinetic scaling laws with exponents observed here are consistent with topologically allowed annihilation events involving multiple disclinations. The results provide insight into two-dimensional pattern formation and may lead to the successful application of block copolymer lithography.
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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                2006
                : 21
                : 2
                : 164-167
                Affiliations
                1 Department of Materials Science & Engineering, Tsinghua University, Beijing, P. R. China
                Author notes
                Mail address: C. Fuzhai, Department of Materials Science & Engineering, Tsinghua University, Beijing 100084, P. R. China. E-mail: cuifz@ 123456mail.tsinghua.edu.cn (F. Z. Cui)
                Article
                IPP0087
                10.3139/217.0087
                4fa9e70c-f221-40ae-8445-04812959a881
                © 2006, Hanser Publishers, Munich
                History
                : 9 July 2005
                : 19 September 2005
                Page count
                References: 17, Pages: 4
                Categories
                Regular Contributed Articles

                Polymer science,Materials technology,Materials characterization,General engineering,Polymer chemistry

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