The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2006
Filed:
Mar. 12, 2004
Rong-ming Ho, Hsinchu, TW;
Yeo-wan Chiang, Taichung, TW;
Chu-chieh Lin, Taichung, TW;
Bao-tsan Ko, Taichung, TW;
Yi-chun Chen, Hsinchu, TW;
Tsai-ming Chung, Hsinchu, TW;
Hsi-hsin Shih, Hsinchu, TW;
Jassy S. J. Wang, Hsinchu, TW;
Rong-Ming Ho, Hsinchu, TW;
Yeo-Wan Chiang, Taichung, TW;
Chu-Chieh Lin, Taichung, TW;
Bao-Tsan Ko, Taichung, TW;
Yi-Chun Chen, Hsinchu, TW;
Tsai-Ming Chung, Hsinchu, TW;
Hsi-Hsin Shih, Hsinchu, TW;
Jassy S. J. Wang, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
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 [η-EDBP)Li][(η-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 35–37%, nanoscale helices with a pitch of 43.8 nanometers and a diameter of 34.4 nanometers were observed.