Main-chain degradable star polymers comprised of pH-responsive hyperbranched cores and thermoresponsive polyethylene glycol-based coronas

2018 ◽  
Vol 9 (39) ◽  
pp. 4824-4839 ◽  
Author(s):  
Ulrike Wais ◽  
Lohitha Rao Chennamaneni ◽  
Praveen Thoniyot ◽  
Haifei Zhang ◽  
Alexander W. Jackson
Keyword(s):  
Polyethylene Glycol ◽  
Ring Opening ◽  
Main Chain ◽  
Star Polymers ◽  
Hyperbranched Polymers ◽  
Ph Responsive ◽  
Radical Ring ◽  
Ketene Acetal

Dual stimuliresponsive main-chain degradable star hyperbranched polymers have been synthesized via cyclic ketene acetal radical ring-opening and RAFT-based methacrylate copolymerization.

scholarly journals Novel monomers in radical ring-opening polymerisation for biodegradable and pH responsive nanoparticles

2019 ◽  
Vol 10 (39) ◽  
pp. 5285-5288 ◽  
Author(s):  
Jenny Folini ◽  
Chao-Hung Huang ◽  
James C. Anderson ◽  
Wolfgang P. Meier ◽  
Jens Gaitzsch
Keyword(s):  
Ring Opening ◽  
Ph Sensitive ◽  
Ph Responsive ◽  
Radical Ring ◽  
Cyclic Ketene Acetals ◽  
Ketene Acetals

We report the first amine-bearing cyclic ketene acetals (CKAs) for radical ring-opening polymerisation (RROP). The resulting polyesters and their corresponding nanoparticles were biodegradable and showed the desired pH sensitive behaviour.

scholarly journals Influence of cyclodextrin on the solubility of a classically prepared 2-vinylcyclopropane macromonomer in aqueous solution

2012 ◽  
Vol 8 ◽  
pp. 1528-1535 ◽  
Author(s):  
Helmut Ritter ◽  
Jia Cheng ◽  
Monir Tabatabai
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acid ◽  
Graft Copolymer ◽  
Ring Opening ◽  
Main Chain ◽  
Double Bonds ◽  
Radical Ring ◽  
Unsaturated Polymer ◽  
End Group ◽  
Clouding Point

A macromonomer 5 consisting of a polymerizable vinylcyclopropane end group and a poly(N-isopropylacrylamide) (poly(NiPAAm)) chain was obtained from amidation of 1-ethoxycarbonyl-2-vinylcyclopropane-1-carboxylic acid (4) with an amino-terminated poly(NiPAAm) 3 as an example. This macromonomer 5 showed an LCST effect after complexation of the vinyl end group with ß-cyclodextrin in water. Via radical ring-opening copolymerization of 5 and NiPAAm a graft copolymer 8 with a clouding point of 32 °C was synthesized. The branched unsaturated polymer was treated with ozone to cleave the double bonds of the main chain.

scholarly journals Truly Random Degradable Vinyl Copolymers via Photocontrolled Radical Ring-Opening Cascade Copolymerization

2021 ◽  
Author(s):  
Wenqi Wang ◽  
Zefeng Zhou ◽  
Xuanting Tang ◽  
Stephanie Moran ◽  
Jing Jin ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Ring Opening ◽  
Main Chain ◽  
Radical Ring ◽  
Polymer Backbone ◽  
Vinyl Polymers ◽  
Powerful Approach ◽  
Chain Composition ◽  
Promising Solution

Degradable vinyl polymers by radical ring-opening polymerization have become a promising solution to the challenges caused by the widespread use of non-degradable vinyl plastics. However, achieving even distribution of labile functional groups in the backbone of degradable vinyl polymers remains challenging. Herein, we report a photocatalytic approach to truly random degradable vinyl copolymers with tunable main-chain composition via radical ring-opening cascade copolymerization (rROCCP). The rROCCP of the macrocyclic allylic sulfone and acrylates or acrylamides mediated by visible light at ambient temperature achieved near-unity reactivity ratios of both comonomers over the entire range of the comonomer compositions and afforded truly random vinyl copolymers with degradable units evenly distributed in the polymer backbone. Experimental and computational evidence revealed an unusual reversible inhibition of chain propagation by in situ generated sulfur dioxide, which was successfully overcome by reducing the solubility of sulfur dioxide in the reaction mixture. This study provided a powerful approach to truly random degradable vinyl copolymers with tunable main-chain labile functionalities and comparable thermal and mechanical properties to traditional non-degradable vinyl polymers.

scholarly journals Designed enzymatically degradable amphiphilic conetworks by radical ring-opening polymerization

2015 ◽  
Vol 6 (35) ◽  
pp. 6409-6415 ◽  
Author(s):  
Yinfeng Shi ◽  
Holger Schmalz ◽  
Seema Agarwal
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Radical Ring ◽  
Cyclopropane Derivative ◽  
Swelling Property ◽  
Ketene Acetal ◽  
Enzymatic Degradability

A simple and versatile route for making functional biodegradable amphiphilic conetworks (APCNs) with unique swelling property and excellent enzymatic degradability is presented. The APCNs were made by radical ring-opening copolymerization of cyclic ketene acetal and vinyl cyclopropane derivative.

UV-Curable Hyperbranched Poly(ester-co-vinyl) by Radical Ring-opening Copolymerization for Antifouling Coatings

2021 ◽  
Author(s):  
Xiaoqing Ai ◽  
Jiansen Pan ◽  
Qingyi Xie ◽  
Chunfeng Ma ◽  
Guangzhao Zhang
Keyword(s):  
Functional Groups ◽  
Ring Opening ◽  
Hyperbranched Polymers ◽  
High Solubility ◽  
Radical Ring ◽  
Uv Curable ◽  
Low Viscosity ◽  
Antifouling Coatings ◽  
Hyperbranched Poly ◽  
Low Crystallinity

Hyperbranched polymers with high solubility, low viscosity, low crystallinity and dense functional groups are promising to be used in adhesives and coatings. In this study, we have developed a cleavable...

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