Thermoresponsive self-healable and recyclable polymer networks based on a dynamic quinone methide–thiol chemistry

2020 ◽  
Vol 11 (38) ◽  
pp. 6157-6162
Author(s):  
Lue Xiang ◽  
Xianfeng Liu ◽  
Huan Zhang ◽  
Ning Zhao ◽  
Ke Zhang
Keyword(s):  
Polymer Network ◽  
Polymer Networks ◽  
Quinone Methide ◽  
Dynamic Covalent Chemistry ◽  
New Type

A new type of thermoresponsive dynamic covalent polymer network was developed with excellent self-healable and recyclable properties based on a new thermoresponsive dynamic covalent chemistry between a para-quinone methide and thiol nucleophiles.

scholarly journals Self-Healing Injectable Polymer Hydrogel via Dynamic Thiol-Alkynone Double Addition Crosslinks

2020 ◽  
Author(s):  
bowen fan ◽  
Kai Zhang ◽  
Qian Liu ◽  
Rienk Eelkema
Keyword(s):  
Polymer Network ◽  
Star Polymer ◽  
Cytotoxicity Test ◽  
Self Healing ◽  
Polymer Hydrogel ◽  
Dynamic Covalent Chemistry ◽  
Hydrogel Network ◽  
New Type ◽  
Aqueous Conditions ◽  
Injectable Polymer

<p>Introduction of dynamic thiol-alkynone double addition crosslinks in a polymer network enable the formation of a self-healing injectable polymer hydrogel. A 4-arm polyethylene glycol (PEG) tetra-thiol star polymer is crosslinked by a small molecule alkynone via the thiol-alkynone double adduct, to generate a hydrogel network under ambient aqueous conditions (buffer pH=7.4 or 8.2, room temperature). The mechanical properties of these hydrogels can be easily tuned by varying the concentration of polymer precursors. Through the dynamic thiol-alkynone double addition crosslink, these hydrogels are self-healing and shear thinning, as demonstrated by rheological measurements, macroscopic self-healing and injection tests. These hydrogels can be injected through a 20G syringe needle and recover after extrusion. In addition, good cytocompatibility of these hydrogels is confirmed by cytotoxicity test. This work shows the application of a new type of dynamic covalent chemistry in the straightforward preparation of self-healing injectable hydrogels, which may find future biomedical applications such as tissue engineering and drug delivery.</p>

scholarly journals Self-Healing Injectable Polymer Hydrogel via Dynamic Thiol-Alkynone Double Addition Crosslinks

2020 ◽  
Author(s):  
bowen fan ◽  
Kai Zhang ◽  
Qian Liu ◽  
Rienk Eelkema
Keyword(s):  
Polymer Network ◽  
Star Polymer ◽  
Cytotoxicity Test ◽  
Self Healing ◽  
Polymer Hydrogel ◽  
Dynamic Covalent Chemistry ◽  
Hydrogel Network ◽  
New Type ◽  
Aqueous Conditions ◽  
Injectable Polymer

<p>Introduction of dynamic thiol-alkynone double addition crosslinks in a polymer network enable the formation of a self-healing injectable polymer hydrogel. A 4-arm polyethylene glycol (PEG) tetra-thiol star polymer is crosslinked by a small molecule alkynone via the thiol-alkynone double adduct, to generate a hydrogel network under ambient aqueous conditions (buffer pH=7.4 or 8.2, room temperature). The mechanical properties of these hydrogels can be easily tuned by varying the concentration of polymer precursors. Through the dynamic thiol-alkynone double addition crosslink, these hydrogels are self-healing and shear thinning, as demonstrated by rheological measurements, macroscopic self-healing and injection tests. These hydrogels can be injected through a 20G syringe needle and recover after extrusion. In addition, good cytocompatibility of these hydrogels is confirmed by cytotoxicity test. This work shows the application of a new type of dynamic covalent chemistry in the straightforward preparation of self-healing injectable hydrogels, which may find future biomedical applications such as tissue engineering and drug delivery.</p>

Impact of dynamic covalent chemistry and precise linker length on crystallization kinetics and morphology in ethylene vitrimers

Soft Matter ◽  
2022 ◽  
Author(s):  
Bhaskar Soman ◽  
Yoo Kyung Go ◽  
Chengtian Shen ◽  
Cecilia Leal ◽  
Christopher M. Evans
Keyword(s):  
Crystal Structure ◽  
Melting Temperature ◽  
Crystallization Kinetics ◽  
Polymer Networks ◽  
Exchange Reactions ◽  
Dynamic Covalent Chemistry ◽  
Linker Length

Vitrimers, dynamic polymer networks with topology conserving exchange reactions, can lead to unusual evolution of the melting temperature and crystal structure of ethylene networks.

Direct characterization of a polymer network through its retainable units

2019 ◽  
Vol 10 (35) ◽  
pp. 4837-4843
Author(s):  
Xiaoyan Xu ◽  
Qi Wang
Keyword(s):  
Polymer Network ◽  
Polymer Networks ◽  
Quantitative Characterization

A partially decrosslinkable network provides a general protocol for full, direct and quantitative characterization of polymer networks through its retainable units.

scholarly journals Polymer network-derived nitrogen/sulphur co-doped three-dimensionally interconnected hierarchically porous carbon for oxygen reduction, lithium-ion battery, and supercapacitor

RSC Advances ◽  
2019 ◽  
Vol 9 (63) ◽  
pp. 36570-36577 ◽  
Author(s):  
Zili Xu ◽  
Fangfang Zhang ◽  
Weiran Lin ◽  
Haining Zhang
Keyword(s):  
Porous Carbon ◽  
Large Scale ◽  
Polymer Network ◽  
Polymer Networks ◽  
Lithium Ion ◽  
Scale Production ◽  
Hierarchical Porous Carbon ◽  
Large Scale Production ◽  
Hierarchical Porous ◽  
Co Doped

Polymer networks are efficient precursors for large scale production of hierarchical porous carbon.

scholarly journals Dynamic covalent chemistry in polymer networks: a mechanistic perspective

2019 ◽  
Vol 10 (45) ◽  
pp. 6091-6108 ◽  
Author(s):  
Johan M. Winne ◽  
Ludwik Leibler ◽  
Filip E. Du Prez
Keyword(s):  
Physicochemical Properties ◽  
Reaction Mechanisms ◽  
Polymer Networks ◽  
Molecular Network ◽  
Polymer Materials ◽  
Dynamic Covalent Chemistry ◽  
Selection Of

A selection of dynamic chemistries is highlighted, with a focus on the reaction mechanisms of molecular network rearrangements, and on how mechanistic profiles can be related to the mechanical and physicochemical properties of polymer materials.

Eosin Y functionalized tertiary amine-bearing interpenetrating polymer networks for heterogeneous catalysis of logic-controlled oxygen-tolerant radical polymerization

2020 ◽  
Vol 8 (47) ◽  
pp. 25363-25370
Author(s):  
Xue Li ◽  
Yu Chi Zhang ◽  
Sunjie Ye ◽  
Xi Rong Zhang ◽  
Tao Cai
Keyword(s):  
Heterogeneous Catalysis ◽  
Radical Polymerization ◽  
Tertiary Amine ◽  
Heterogeneous Catalysts ◽  
Polymer Network ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Eosin Y

Given the scalability and vast applicability of the heterogeneous catalysts and the burgeoning interests in biorelated applications, the interpenetrating polymer network catalysts will facilitate the realization of green, precise and efficient polymerization.

scholarly journals A Guide through the Dental Dimethacrylate Polymer Network Structural Characterization and Interpretation of Physico-Mechanical Properties

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4057 ◽  
Author(s):  
Izabela Maria Barszczewska-Rybarek
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Structural Parameters ◽  
Polymer Network ◽  
Polymer Networks ◽  
Impact Resistance ◽  
Organic Matrices ◽  
Dental Restorative

Material characterization by the determination of relationships between structure and properties at different scales is essential for contemporary material engineering. This review article provides a summary of such studies on dimethacrylate polymer networks. These polymers serve as photocuring organic matrices in the composite dental restorative materials. The polymer network structure was discussed from the perspective of the following three aspects: the chemical structure, molecular structure (characterized by the degree of conversion and crosslink density (chemical as well as physical)), and supramolecular structure (characterized by the microgel agglomerate dimensions). Instrumental techniques and methodologies currently used for the determination of particular structural parameters were summarized. The influence of those parameters as well as the role of hydrogen bonding on basic mechanical properties of dimethacrylate polymer networks were finally demonstrated. Mechanical strength, modulus of elasticity, hardness, and impact resistance were discussed. The issue of the relationship between chemical structure and water sorption was also addressed.

Crosslinking, Filler, or Transition Constraint of Polymer Networks. I

1971 ◽  
Vol 44 (5) ◽  
pp. 1208-1226
Author(s):  
A. F. Blanchard
Keyword(s):  
Molecular Weight ◽  
Polymer Network ◽  
Polymer Networks ◽  
Physical Measurements ◽  
Polymer Fraction

Abstract For a polymer network at equilibrium in solvent, Flory and Rehner related the polymer fraction νr of the swollen volume to the molecular weight Mc of the chains between crosslinks. Their equation is represented below by the function F(νr) with [Mc] denoting the effective mesh weight, i.e., that obtained by physical measurements. Hence the effective crosslinking 1/[Mc]g from swelling measurements νr is given by 1/F(νr).

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