Stepwise Assembly of Enantiomeric Poly(lactide)s on Surfaces
Stepwise Assembly of Enantiomeric Poly(lactide)s on Surfaces
复制标题
对映体聚丙交酯在表面上的逐步组装
DOI：
10.1021/ma001705o
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发表时间：
2001
期刊：
影响因子：
5.5
通讯作者：
M. Akashi
中科院分区：
文献类型：
--
作者：
T. Serizawa;Hiroo Yamashita;Tomoko Fujiwara;Y. Kimura;M. Akashi
将对映体聚丙交酯S组装在石英晶体微天平上，通过石英晶体微天平在交替的乙腈溶液中浸泡后的频移来检测聚合物的质量。每一步的定量QCM分析和对组装的差示扫描量热研究表明，在底物表面形成了外消旋晶体(立体络合物)。原子力显微镜观察显示，该组装呈点状纳米结构。随着聚乳酸浓度和浸泡时间的增加，聚乳酸的聚集量增加，而随着组装温度的升高，聚乳酸的聚集量减少。通过改变浸泡时间制备了多相组装。我们发现外消旋晶体的形成被应用于某些结构调节的聚合物的交替沉积。
Enantiomeric poly(lactide)s were assembled on a quartz crystal microbalance (QCM) substrate, which detects the mass of the polymers from the frequency shift, following immersion of QCM into alternating acetonitrile solutions. A quantitative QCM analysis at each step and a differential scanning calorimetric study of the assembly showed racemic crystal (stereocomplex) formation on the substrate surface. Atomic force microscopic observation showed a dotted nanostructure of the assembly. The assembly amount was increased with increasing the PLA concentration and the immersion time, while that was decreased with increasing the assembly temperature. The heterogeneous assembly was also prepared by altering the immersion time. We found that racemic crystal formation was applied to the alternate deposition of certain structurally regulated polymers.