Design, Synthesis and Application of Novel Degradable Materials Based on Polyesters by Radical Ring-Opening Polymerization
type: CreativeWork
description: Design, synthesis and application of novel degradable material based on polyesters by radical ring-opening polymerization (RROP) were described in this thesis. Herein, we studied a rare example of the formation of polystyrene-grafted aliphatic polyester in one-pot by radical polymerization including the reaction mechanism, designed enzymatically degradable amphiphilic conetworks by RROP, developed enzymatically degradable DOPA-containing polyester based adhesives by radical polymerization, and prepared and characterized novel thermally stable optically transparent copolymers with degradable ester linkages. In the case of formation of a graft copolymer in one-pot by radical polymerization, the cyclic ester β-propiolactone (β-PL) and styrene (St) were copolymerized at 120 °C with various monomer ratios. It is a rare example of a system providing graft copolymers (PSt-g-β-PL) with a complete range of monomer ratios in one pot. The structure of the resulting β-PL-St copolymers was proved by using a combination of different characterization techniques, such as 1D and 2D NMR spectroscopy and gel permeation chromatography (GPC), and also the analysis before and after alkaline hydrolysis of polymers. A significant difference in the reactivity of St and β-PL and radical chain transfer reactions at the polystyrene (PSt) backbone, followed by combination with the active growing poly(β-PL) chains, led to the formation of graft copolymers by a grafting-onto mechanism. We designed a different route for the preparation of enzymatically degradable amphiphilic conetworks (APCNs) based on unsaturated polyesters by RROP of vinylcyclopropane (VCP) with cyclic ketene acetal (CKA). In the first step, the unsaturated degradable polyesters with random distribution of cross-linkable double bonds and degradable ester units were prepared by radical ring-opening copolymerization of VCP and 2-methylene-4-phenyl-1,3-dioxolane (MPDO). Very similar reactivity ratios, unimodal GPC curves and 2D NMR…
abstract: Design, synthesis and application of novel degradable material based on polyesters by radical ring-opening polymerization (RROP) were described in this thesis. Herein, we studied a rare example of the formation of polystyrene-grafted aliphatic polyester in one-pot by radical polymerization including the reaction mechanism, designed enzymatically degradable amphiphilic conetworks by RROP, developed enzymatically degradable DOPA-containing polyester based adhesives by radical polymerization, and prepared and characterized novel thermally stable optically transparent copolymers with degradable ester linkages. In the case of formation of a graft copolymer in one-pot by radical polymerization, the cyclic ester β-propiolactone (β-PL) and styrene (St) were copolymerized at 120 °C with various monomer ratios. It is a rare example of a system providing graft copolymers (PSt-g-β-PL) with a complete range of monomer ratios in one pot. The structure of the resulting β-PL-St copolymers was proved by using a combination of different characterization techniques, such as 1D and 2D NMR spectroscopy and gel permeation chromatography (GPC), and also the analysis before and after alkaline hydrolysis of polymers. A significant difference in the reactivity of St and β-PL and radical chain transfer reactions at the polystyrene (PSt) backbone, followed by combination with the active growing poly(β-PL) chains, led to the formation of graft copolymers by a grafting-onto mechanism. We designed a different route for the preparation of enzymatically degradable amphiphilic conetworks (APCNs) based on unsaturated polyesters by RROP of vinylcyclopropane (VCP) with cyclic ketene acetal (CKA). In the first step, the unsaturated degradable polyesters with random distribution of cross-linkable double bonds and degradable ester units were prepared by radical ring-opening copolymerization of VCP and 2-methylene-4-phenyl-1,3-dioxolane (MPDO). Very similar reactivity ratios, unimodal GPC curves and 2D NMR…
author: Shi, Yinfeng
date published: 2015-11-19
date modified: 2026-07-27T18:49:49Z
provider: Universität Bayreuth
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universität Bayreuth