Branched Block Copolymers for Tuning of Morphology and Feature Size in Thin Film Nanolithography

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• 作者：Hiroki Minehara ; Louis M. Pitet ; Sangwon Kim ; R. Helen Zha ; E. W. Meijer ; Craig J. Hawker
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：March 22, 2016
• 年：2016
• 卷：49
• 期：6
• 页码：2318-2326
• 全文大小：661K
• ISSN：1520-5835

文摘

A library of Y-shaped poly(dimethylsiloxane) (PDMS)-b-poly(d,l-lactide) (PLA) diblock copolymers and their corresponding linear counterparts were synthesized, and their morphologies and feature sizes in bulk and thin films were compared using small-angle X-ray scattering (SAXS), scanning force microscopy (SFM), and grazing incidence small-angle X-ray scattering (GI-SAXS). For macromolecular isomers with approximately the same molecular weights and volume fractions (PLA f_L: 0.20 and 0.35), different thin film morphologies were obtained for the Y-shaped PDMS-b-PLA derivatives when compared to the corresponding linear derivatives. These data also gave us the option to determine some of the key parameters of these block copolymers. A relatively high χ value of 0.24 was found for these PDMS-b-PLA systems and was shown to be influenced by architecture.