Patent ID: 7135523
Filing Date: 2006-11-14
Classification: C08F,C08L,G03F

Abstract:
1. A method for making a series of nanoscale microstructures comprising the steps of: (1) forming a chiral block copolymer containing a first polymer block of a first polymer and a second polymer block of a second polymer, wherein at least said first polymer is a chiral polymer exhibiting chirality, and said first and second polymer blocks are capable of being subject to a micro-phase separation and said first polymer has a volume fraction ranging from 10 to 90%; (2) causing a microphase separation in said chiral block copolymer; wherein said first polymer is poly(L-lactide) and said second polymer is selected from the group consisting of polystyrene and pol(4-vinylpyridine), further wherein said chiral block copolymer is poly(styrene)-poly(L-lactide) (PS-PLLA) chiral block copolymer when said second polymer is polystyrene and poly(4-vinylpyridine)-poly(L-lactide) (P4-VP-PLLA) chiral block copolymer when said second polymer is pol(4-vinylpyridine); further wherein said poly(styrene)-poly(L-lactide) (PS-PLLA) chiral block copolymer is prepared using a polymerization process comprising the following steps: (a) mixing styrene with BPO and 4-OH-TEMPO to form 4-hydroxy-TEMPO-terminated polystyrene; and (b) mixing said 4-hydroxy-TEMPO-terminated polystyrene with L-lactide in an organic solvent to form said poly(styrene)-poly(L-lactide) chiral block copolymer.