Linear pentablock quintopolymers (I-SIDMV) with five incompatible blocks: Polystyrene, polyisoprene-1,4, poly(dimethylsiloxane), poly(tert-butyl methacrylate), and poly(2-vinylpyridine)

Three linear pentablock quintopolymers (1-SIDMV), where S is polystyrene (PS), I polyisoprene-1,4 (PI), D poly(dimethylsiloxane) (PDMS), M poly(tert-butyl methacrylate) (PrBuM), and V poly(2-vinylpyridine) (P2VP), were synthesized by anionic polymerization high vacuum techniques. The approach involves the following: (a) The synthesis of living triblock terpolymer PS-6-PI-b-PDMSLi and diblock copolymer P2VP-&-PtBuMK by sequential polymerizations of the corresponding monomers with sec-BuLi and benzyl potassium, respectively; and (b) The selective linking of the living triblock terpolymer with the chlorosilane group of 2-(chloromethylphenyl) ethyldimethylchlorosilane (CMPDMS), followed by linking of the living block copolymer with the remaining chloromethyl group of CMPDMS. Molecular characterization carried out by size exclusion chromatography, membrane osmometry, solution (in CDCI ₃ or d ₈-toluene) and solid-state ¹H-NMR spectroscopy indicated a high degree of molecular and compositional homogeneity. Differential scanning calorimetry results on the precursors and final polymers were discussed.