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

摘要: A method for making a series of nanoscale microstructures, including helical microstructures and cylindrical microstructures. This includes the steps of: (1) forming chiral block copolymer containing plurality first polymer blocks second wherein have volume fraction ranging from 20 to 49%; (2) causing phase separation in copolymer. In preferred embodiment, is poly(styrene)-poly(L-lactide) (PS-PLLA) copolymer, copolymerization process living which following steps: (a) mixing styrene with BPO 4-OH-TEMPO form 4-hydroxy-TEMPO-terminated polystyrene; polystyrene [(η3-EDBP)Li2]2[(η3-nBu)Li(0.5Et2O)]2 L-lactide an organic solvent preferably CH2Cl2 Transmission electron microscopy (TEM) small X-ray scattering (SAXS) studies show that when poly(L-lactide) about 35-37%, helices pitch 43.8 nanometers diameter 34.4 were observed.