Τίτλος:
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
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
We report the synthesis of the novel half-titanocene alkoxide complex bischloro-η5-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 macromonomer was 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. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 1102–1112. © 2017 Wiley Periodicals, Inc.
Συγγραφείς:
Choinopoulos, I.
Koinis, S.
Pitsikalis, M.
Περιοδικό:
Journal of Polymer Science Part A: Polymer Chemistry
Εκδότης:
John Wiley and Sons Inc
Λέξεις-κλειδιά:
Circular dichroism spectroscopy; Dendrimers; Dichroism; Differential scanning calorimetry; Homopolymerization; Monomers; Nuclear magnetic resonance; Nuclear magnetic resonance spectroscopy; Organic polymers; Size exclusion chromatography; Terpolymers; Thermogravimetric analysis, Chiral; Hexyl isocyanate; Lactides; Macro-monomers; ROMP, Ring opening polymerization
