Rod-Coil Block Copolymers Based on Polyisocyanates

Although polypeptide rod-coil block copolymers [9, 10, 59] are very interesting materials, the study of a true rod-coil system requires a simpler model material because polypeptides have so many possible 

SH-Vy S stands for styrene block, H for poly(n-hexyl isocyanate) block, x for the real molecular weight of styrene block, and y for the polyisocyanate block in kg/mol. 

Relative molecular weight from GPC measurements. Polystyrene standards were used as calibration. The GPC gives values much larger than the real molecular weight due to the rigid nature of the molecule which results in a shorter retention time in the GPC column. 

DPpsi Degree of polymerization for PS block. All samples of the PS block have polydispersity between 1.04-1.08. The M of the rod block were calculated from molar ratio obtained from HNMR and the M of styrene block were measured from GPC. 

4 Block Copolymers Containing Liquid Crystalline Segments 

---