Towards a tough reprocessable and self-healable acrylonitrile-butadiene rubber based on strong hydrogen bonding interactions

2021 ◽  
Author(s):  
Wenyan Wang ◽  
Weicheng Zhang ◽  
Zongxu Liu ◽  
Ying Xue ◽  
Xingfeng Lei ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
High Performance ◽  
Butadiene Rubber ◽  
Acrylonitrile Butadiene Rubber ◽  
Hydrogen Bonding Interactions

Tough reprocessable and self-healable acrylonitrile-butadiene rubber (NBR) is developed by grafting 2-ureido-4[1H]-pyrimidinone groups onto the backbone of amidoxime NBR, representing a big step in recyclable high-performance NBR.

scholarly journals Boosting Performance of Self-Polarized Fully Printed Piezoelectric Nanogenerators via Modulated Strength of Hydrogen Bonding Interactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1908
Author(s):  
Hai Li ◽  
Sooman Lim
Keyword(s):  
Hydrogen Bonding ◽  
Composite Film ◽  
High Performance ◽  
Composite Films ◽  
Β Phase ◽  
Hydrogen Bonding Interactions ◽  
Barium Titanate Nanoparticles ◽  
Surface Modified ◽  
Piezoelectric Devices ◽  
Piezoelectric Nanogenerators

Self-polarized piezoelectric devices have attracted significant interest owing to their fabrication processes with low energy consumption. Herein, novel poling-free piezoelectric nanogenerators (PENGs) based on self-polarized polyvinylidene difluoride (PVDF) induced by the incorporation of different surface-modified barium titanate nanoparticles (BTO NPs) were prepared via a fully printing process. To reveal the effect of intermolecular interactions between PVDF and NP surface groups, BTO NPs were modified with hydrophilic polydopamine (PDA) and hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) to yield PDA-BTO and PFD-BTO, respectively. This study demonstrates that the stronger hydrogen bonding interactions existed in PFD-BTO/PVDF composite film comparative to the PDA-BTO/PVDF composite film induced the higher β-phase formation (90%), which was evidenced by the XRD, FTIR and DSC results, as well as led to a better dispersion of NPs and improved mechanical properties of composite films. Consequently, PFD-BTO/PVDF-based PENGs without electric poling exhibited a significantly improved output voltage of 5.9 V and power density of 102 μW cm−3, which was 1.8 and 2.9 times higher than that of PDA-BTO/PVDF-based PENGs, respectively. This study provides a promising approach for advancing the search for high-performance, self-polarized PENGs in next-generation electric and electronic industries.

scholarly journals Investigation of the solvent-dependent photolysis of a nonnucleoside reverse-transcriptase inhibitor, antiviral agent efavirenz

2017 ◽  
Vol 25 (3) ◽  
pp. 94-104
Author(s):  
Maryam A Jordaan ◽  
Michael Shapi
Keyword(s):  
Hydrogen Bonding ◽  
High Performance ◽  
Antiviral Agent ◽  
Energy Shift ◽  
Transcriptase Inhibitor ◽  
Intramolecular Proton Transfer ◽  
Biologically Active ◽  
Hydrogen Bond Donor ◽  
Flight Mass Spectrometry ◽  
Hydrogen Bonding Interactions

This study sought to investigate the solvent-dependency on the photolysis of efavirenz to gain insight into the photoprocesses involved. The primary mechanisms were firstly the excited-state intramolecular proton transfer (i.e. phototautomerization), which generated the imidic acid phototautomer observed as [M-H]− quasimolecular ion at m/z 314.0070 in the high-performance liquid chromatography–electrospray ionization–time-of-flight mass spectrometry in the negative mode. Secondly, the photoinduced α-cleavage with the loss of a carbonyl group occurred (i.e. photodecarbonylation) to form the photoproduct at m/z 286.0395. The ultraviolet–visible spectra illustrated a large, hyperchromic, and slight bathochromic effect in both the π→π* and n→π* electronic transitions. The largest bathochromic effect was prevalent in the chloroform solvent, i.e. chloroform (π* = 0.58; β = 0.00; α = 0.44) > methanol (π* = 0.60; β = 0.66; α = 0.98) > acetonitrile (π* = 0.75; β = 0.40; α = 0.19). This is due to the significant interaction of the amino group with the excited carbonyl moiety which is attributed to intramolecular phototautomerization resulting in a larger energy shift of the electronic state. A plausible explanation is due to the hydrogen bond donor ability of the polar methanol and nonpolar chloroform solvents, which stabilized the polarized imidic acid phototautomer by means of hydrogen bonding interactions, as opposed to the aprotic acetonitrile which exhibits no hydrogen bonding interactions. The study would form the basis for further photolytic analyses and syntheses to generate a plethora of novel photoproducts with anti-HIV activity based on the biologically active benzoxazinone framework of efavirenz.

scholarly journals An approach towards tailoring interfacial structures and properties of multiphase renewable thermoplastics from lignin–nitrile rubber

2016 ◽  
Vol 18 (20) ◽  
pp. 5423-5437 ◽  
Author(s):  
Tony Bova ◽  
Chau D. Tran ◽  
Mikhail Y. Balakshin ◽  
Jihua Chen ◽  
Ewellyn A. Capanema ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
General Purpose ◽  
Nitrile Rubber ◽  
Butadiene Rubber ◽  
Acrylonitrile Butadiene Rubber ◽  
Interfacial Structures ◽  
Structures And Properties ◽  
Reactive Mixing

High-performance multiphase thermoplastics were synthesized by reactive mixing of unmodified industrial lignin and low-cost additives in a matrix of general-purpose acrylonitrile-butadiene rubber (NBR).

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