Industrial Technology Research Institute

Tsai-Ming Chung

Yi-Chun Chen

Hsi-Hsin Shih

Rong-Ming Ho

Bao-Tsan Ko

Yeo-Wan Chiang

Chu-Chieh Lin

Jassy S J Wang

A method for making a series of nanoscale microstructures, including helical microstructures and cylindrical microstrustures. This method includes the steps of: (1) forming a chiral block copolymer containing a plurality of chiral first polymer blocks and a second polymer blocks wherein the chiral first polymer blocks have a volume fraction ranging from 20 to 49%; (2) causing a phase separation in the chiral block copolymer. In a preferred embodiment, the chiral block copolymer is poly(styrene)-poly(L-lactide) (PS-PLLA) chiral block copolymer, and the copolymerization process is a living copolymerization process which includes the following steps: (a) mixing styrene with BPO and 4-OH-TEMPO to form 4-hydroxy-TEMPO-terminated polystyrene; and (2) mixing the 4-hydroxy-TEMPO-terminated polystyrene with [&#x3b7;-EDBP)Li][(&#x3b7;-Bu)Li(0.5EtO)]and L-lactide in an organic solvent preferably CHClto form the poly(styrene)-poly(L-lactide) chiral block copolymer. Transmission electron microscopy (TEM) and small X-ray scattering (SAXS) studies show that when the volume fraction of poly(L-lactide) is about 35&#x2013;37%, nanoscale helices with a pitch of 43.8 nanometers and a diameter of 34.4 nanometers were observed.

Nanoscale helical microstructures and channels from chiral poly(L-lactide) block containing block copolymers

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Hsinchu, Taiwan

Tsai-Ming Chung