Macromolecular Brushes Based on Poly(L-Lactide) and Poly(ε-Caprolactone) Single and Double Macromonomers via ROMP. Synthesis, Characterization and Thermal Properties.

Nikovia Nikovia,Sougioltzoupoulou Sougioltzoupoulou,Pitsikalis Pitsikalis,Rigas Rigas

doi:10.3390/polym11101606

Nikovia Nikovia, Sougioltzoupoulou Sougioltzoupoulou + Show 2 more

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https://doi.org/10.3390/polym11101606

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Journal: Polymers	Publication Date: Oct 1, 2019
Citations: 5	License type: CC BY 4.0

Affiliation: National and Kapodistrian University of Athens

Abstract

Single and double poly(L-lactide) (PLLA) and poly(ε-caprolactone) (PCL) macromonomers having a norbornenyl polymerizable group were prepared by conventional Ring Opening Polymerization (ROP). These macromonomers were further subjected to ring opening metathesis polymerization (ROMP) reactions in order to produce double polymer brushes consisting of PLLA or PCL side chains on a polynorbornene (PNBE) backbone. Statistical or block ring opening metathesis copolymerization of the PLLA and PCL macromonomers afforded the corresponding random and block double brushes. Sequential ROMP of the single PLLA, PCL and PLLA macromonomers resulted in the synthesis of the corresponding triblock copolymer brush. The molecular characteristics of the macromolecular brushes were obtained by 1H-NMR spectroscopy and Size Exclusion Chromatography. The thermal properties of the samples were studied by thermogravimetric analysis, TGA, Differential Thermogravimetry, DTG and Differential Scanning Calorimetry, DSC.

Highlights

Macromolecular engineering has been proven to be the tool for the manipulation of polymeric materials properties in recent years [1,2,3]
We reported the synthesis of norbornene-functionalized poly(L-lactide), PLLA, and poly(ε-caprolactone), PCL, macromonomers from stannous octoate-catalysed ring opening polymerization (ROP), in the presence of a mono-hydroxylated norbornene derivative as an initiator
Well-defined single and double poly(L-lactide) and poly(ε-caprolactone) macromonomers having a norbornenyl group were synthesized via conventional Ring Opening Polymerization

Summary

Introduction

Macromolecular engineering has been proven to be the tool for the manipulation of polymeric materials properties in recent years [1,2,3]. The application of characteristic organic chemistry reactions, e.g., click chemistry [15] and Suzuki coupling [16], the synthesis of novel initiators, linking agents, chain transfer agents, organocatalytic species and metal complexes have allowed the transition of Polymer Chemistry to a new era leading to the synthesis of complex macromolecular architectures in an elegant and efficient way [17,18]. Among these effective and relatively new polymerization techniques is definitely Ring Opening

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