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Journal of Polymer Science Part A: Polymer Chemistry, Vol.55, No.6, 1102-1112, 2017
Synthesis and Characterization of Chiral Poly(L-lactide-b-hexyl isocyanate) Macromonomers with Norbornenyl End Groups and Their Homopolymerization Through Ring Opening Metathesis Polymerization to Afford Polymer Brushes
We report the synthesis of the novel half-titanocene alkoxide complex bischloro- eta(5)-cyclopentadienyl(bicyclo[2.2.1]hept-5-en-2-oxy) titanium (IV), [CpTiCl2(O-NBE)]. This complex was employed for the synthesis of chiral poly(L-lactide-b-hexyl-isocyanate) diblock copolymer bearing a norbornene end group with sequential addition of monomers. The poly(hexyl isocyanate) block is chiral due to the last L-lactide unit of the poly(L-lactide) block. This macromonomerwas polymerized towards a chiral polymer brush structure with polynorbornene backbone and chiral poly(L-lactide-b-hexyl isocyanate) side chains using Grubbs first-generation catalyst. The polymers were characterized using size exclusion chromatography (SEC), nuclear magnetic resonance (NMR), and circular dichroism (CD) spectroscopy and their thermal properties were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. (C) 2017 Wiley Periodicals, Inc.