The Critical Role of Inter-Component Hydrogen Bonds in the Formation of Reversibly Interlocked Polymer Networks

2021 ◽  
Author(s):  
Mei Rui Fu ◽  
Yang You ◽  
Min Zhi Rong ◽  
Ming Qiu Zhang
Keyword(s):  
Hydrogen Bonds ◽  
Critical Role ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Crosslinked Polymers ◽  
Covalent Bonds ◽  
Reversible Covalent

The recently developed reversibly interlocked polymer networks are made from two-pre-formed crosslinked polymers containing reversible covalent bonds via topological rearrangement. Unlike interpenetrating polymer networks, the resultant is rather homogeneous regardless...

scholarly journals Microbiological-Chemical Sourced Chondroitin Sulfates Protect Neuroblastoma SH-SY5Y Cells against Oxidative Stress and Are Suitable for Hydrogel-Based Controlled Release

Antioxidants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1816
Author(s):  
Emiliano Bedini ◽  
Alfonso Iadonisi ◽  
Chiara Schiraldi ◽  
Laura Colombo ◽  
Diego Albani ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Neuroprotective Effect ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Ethical Concerns ◽  
Chondroitin Sulfates ◽  
Sulfation Pattern ◽  
Pre Treatment ◽  
Set Up

Chondroitin sulfates (CS) are a class of sulfated glycosaminoglycans involved in many biological processes. Several studies reported their protective effect against neurodegenerative conditions like Alzheimer’s disease. CS are commonly derived from animal sources, but ethical concerns, the risk of contamination with animal proteins, and the difficulty in controlling the sulfation pattern have prompted research towards non-animal sources. Here we exploited two microbiological-chemical sourced CS (i.e., CS-A,C and CS-A,C,K,L) and Carbopol 974P NF/agarose semi-interpenetrating polymer networks (i.e., P.NaOH.0 and P.Ethanol.0) to set up a release system, and tested the neuroprotective role of released CS against H2O2-induced oxidative stress. After assessing that our CS (1–100 µM) require a 3 h pre-treatment for neuroprotection with SH-SY5Y cells, we evaluated whether the autoclave type (i.e., N- or B-type) affects hydrogel viscoelastic properties. We selected B-type autoclaves and repeated the study after loading CS (1 or 0.1 mg CS/0.5 mL gel). After loading 1 mg CS/0.5 mL gel, we evaluated CS release up to 7 days by 1,9-dimethylmethylene blue (DMMB) assay and verified the neuroprotective role of CS-A,C (1 µM) in the supernatants. We observed that CS-A,C exhibits a broader neuroprotective effect than CS-A,C,K,L. Moreover, sulfation pattern affects not only neuroprotection, but also drug release.

Interpenetrating polydicyclopentadiene/polyacrylate networks obtained by simultaneous non-interfering frontal polymerization

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Stefano Fiori ◽  
Alberto Mariani ◽  
Laura Ricco ◽  
Saverio Russo
Keyword(s):  
Free Radical ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Front Velocity ◽  
Frontal Polymerization ◽  
Maximum Temperature ◽  
Glycol Dimethacrylate ◽  
Monomer Ratio ◽  
Free Radical Initiator

AbstractInterpenetrating polymer networks made of dicyclopentadiene and methyl methacrylate or tri(ethylene glycol) dimethacrylate have been successfully prepared by non-interfering frontal polymerization. The role of catalyst and free radical initiator relative amounts, as well as of monomer ratio, has been thoroughly studied. The conditions under which a pure frontal polymerization occurs, and the related values of both front velocity and maximum temperature reached by the reaction, are presented and discussed.

scholarly journals Research on synthesis and self-healing properties of interpenetrating network hydrogels based on reversible covalent and reversible non-covalent bonds

2021 ◽  
Vol 28 (1) ◽  
Author(s):  
Xiaowen Huang ◽  
Xiaofei Wang ◽  
Chuanying Shi ◽  
Yang Liu ◽  
Yanyan Wei
Keyword(s):  
Hydrogen Bonds ◽  
Disulfide Bonds ◽  
The Self ◽  
Self Healing ◽  
Complex Environment ◽  
Interpenetrating Network ◽  
Covalent Bonds ◽  
Healing Efficiency ◽  
Potential Applications ◽  
Reversible Covalent

AbstractFirst of all, we will provide a brief background on the self-healing hydrogels we produced which are suitable for the complex environment of nature. In this paper, disulfide bonds and acylhydrazone bonds can be combined in SH-WPU and hydrogen bonds existed in PAMAM. And the hydrogel can achieve self-healing under acid, alkaline, neutral or light environment.Self-healing for 1 h, 24 h and 48 h, the self-healing efficiency is 31.58%, 49.84% and 87.35% respectively. This effect achieved the desired effect and the repair effect is more obvious than previous research results. The hydrogels have potential applications in the field of biomaterials.

Insights into the Role of Hydrogen Bonds on the Mechanical Properties of Polymer Networks

2021 ◽  
Author(s):  
Xin Huang ◽  
Shintaro Nakagawa ◽  
Hirohiko Houjou ◽  
Naoko Yoshie
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonds ◽  
Polymer Networks

Critical role of weak [C–H⋯O] hydrogen bonds in the assembly of benzo[1,2-d:4,5-d′]bisoxazole cruciforms into supramolecular sheets

CrystEngComm ◽  
2012 ◽  
Vol 14 (19) ◽  
pp. 6152 ◽  
Author(s):  
Jaebum Lim ◽  
Karolina Osowska ◽  
Jacob A. Armitage ◽  
Benjamin R. Martin ◽  
Ognjen Š. Miljanić
Keyword(s):  
Hydrogen Bonds ◽  
Critical Role

scholarly journals Study of network composition in interpenetrating polymer networks of poly(N isopropylacrylamide) microgels: The role of poly(acrylic acid)

2019 ◽  
Vol 545 ◽  
pp. 210-219 ◽  
Author(s):  
Valentina Nigro ◽  
Roberta Angelini ◽  
Benedetta Rosi ◽  
Monica Bertoldo ◽  
Elena Buratti ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Network Composition ◽  
Poly Acrylic Acid
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