scholarly journals Compression-molded products based on wet ball-milled wood and effect of various preparation conditions

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3934-3941
Author(s):  
Kentaro Abe
Keyword(s):  
Hydrogen Bond ◽  
Ball Milling ◽  
Bond Formation ◽  
Hydrophilic Surface ◽  
Wood Powder ◽  
Hydrogen Bond Formation ◽  
Mechanical Disintegration ◽  
Preparation Conditions ◽  
Bonding Area ◽  
Wood Fragment

This study prepared compression-molded products from ball-milled wood by thermally plasticizing lignin without adhesives or resins. Wet ball milling for 120 min produced smooth, creamy slurries. The resultant products were hot-pressed at 180 °C and exhibited a plastic-like glossy surface and a high Young’s modulus (7.9 GPa), which was attributed to an increased bonding area. However, hydrogen bond formation occurs more predominantly during wood molding than thermoplasticization of lignin, because a hydrophilic surface was formed on wood fragments after wet ball milling in water. In contrast, when wood powder was ball-milled in toluene, drying aggregation due to hydrogen bond formation hardly occurred probably because the hydrophobic regions were preferentially cleaved. In this case, the hot-pressed product at 180 °C was formed mostly through the bonding owing to the thermoplasticization of lignin. These results suggest that the choice of the solvent for the mechanical disintegration of wood allows for control of the wood fragment surface and can affect the properties of the molded products.

Vapochromism induced by intermolecular electron transfer coupled with hydrogen-bond formation in zinc dithiolene complex

2020 ◽  
Vol 8 (42) ◽  
pp. 14939-14947
Author(s):  
So Yokomori ◽  
Shun Dekura ◽  
Tomoko Fujino ◽  
Mitsuaki Kawamura ◽  
Taisuke Ozaki ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Electron Transfer ◽  
Bond Formation ◽  
Intermolecular Electron Transfer ◽  
Hydrogen Bond Formation ◽  
Complex Crystal

A novel vapochromic mechanism by intermolecular electron transfer coupled with hydrogen-bond formation was realized in a zinc dithiolene complex crystal.

Diverse mechanisms of carbon-hydrogen bond formation through binuclear reductive elimination reactions

1982 ◽  
Vol 104 (2) ◽  
pp. 619-621 ◽  
Author(s):  
Mario J. Nappa ◽  
Roberto Santi ◽  
Steven P. Diefenbach ◽  
Jack Halpern
Keyword(s):  
Hydrogen Bond ◽  
Bond Formation ◽  
Reductive Elimination ◽  
Hydrogen Bond Formation ◽  
Elimination Reactions

Theoretical analysis of the (HNO)2, (HNO···HNS), and (HNS)2 dimers — A case of red and blue shifts of N–H stretching frequency

2010 ◽  
Vol 88 (8) ◽  
pp. 849-857 ◽  
Author(s):  
Nguyen Tien Trung ◽  
Tran Thanh Hue ◽  
Minh Tho Nguyen
Keyword(s):  
Hydrogen Bond ◽  
Quantum Chemical ◽  
Bond Formation ◽  
Blue Shift ◽  
Proton Donor ◽  
Basis Sets ◽  
Coupled Cluster ◽  
Hydrogen Bond Formation ◽  
Length Contraction ◽  
Moller Plesset

The hydrogen-bonded interactions in the simple (HNZ)2 dimers, with Z = O and S, were investigated using quantum chemical calculations with the second-order Møller–Plesset perturbation (MP2), coupled-cluster with single, double (CCSD), and triple excitations (CCSD(T)) methods in conjunction with the 6-311++G(2d,2p), aug-cc-pVDZ, and aug-cc-pVTZ basis sets. Six-membered cyclic structures were found to be stable complexes for the dimers (HNO)2, (HNS)2, and (HNO–HNS). The pair (HNS)2 has the largest complexation energy (–11 kJ/mol), and (HNO)2 the smallest one (–9 kJ/mol). A bond length contraction and a frequency blue shift of the N–H bond simultaneously occur upon hydrogen bond formation of the N–H···S type, which has rarely been observed before. The stronger the intramolecular hyperconjugation and the lower the polarization of the X–H bond involved as proton donor in the hydrogen bond, the more predominant is the formation of a blue-shifting hydrogen bond.

Internal Hydrogen Bond Formation in a syn-Hydroxyepoxide

Science ◽  
1982 ◽  
Vol 215 (4533) ◽  
pp. 695-696 ◽  
Author(s):  
J. P. GLUSKER ◽  
D. E. ZACHARIAS ◽  
D. L. WHALEN ◽  
S. FRIEDMAN ◽  
T. M. POHL
Keyword(s):  
Hydrogen Bond ◽  
Bond Formation ◽  
Hydrogen Bond Formation ◽  
Internal Hydrogen ◽  
Internal Hydrogen Bond

Influence of Hydrogen Bond Formation on the Photophysics ofN-(2,6-Dimethylphenyl)-2,3-naphthalimide

2004 ◽  
Vol 108 (19) ◽  
pp. 4357-4364 ◽  
Author(s):  
Attila Demeter ◽  
László Ravasz ◽  
Tibor Bérces
Keyword(s):  
Hydrogen Bond ◽  
Bond Formation ◽  
Hydrogen Bond Formation

Ruthenium-catalyzed Asymmetric Dehydrative Allylic Cyclization of Chalcogen 5-Membered Heteroaromatics

Synthesis ◽  
2021 ◽  
Author(s):  
Shinji Tanaka ◽  
Shoutaro Iwase ◽  
Sena Kanda ◽  
Marie Kato ◽  
Yutaro Kiriyama ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Bond Formation ◽  
Selection Method ◽  
Allylic Alcohol ◽  
Hydrogen Bond Formation ◽  
Pyridine Carboxylic Acid ◽  
Bicyclic Compounds ◽  
Allyl Complex ◽  
Pyridine Carboxylic ◽  
High Yields

The asymmetric dehydrative intramolecular allylation reactions of furan and thiophene were performed using a cationic cyclopentadienyl-ruthenium (CpRu) complex of a chiral pyridine carboxylic acid, namely Cl-Naph-PyCOOH. Both furan and thiophene tethered with an allylic alcohol gave the corresponding bicyclic compounds in high yields and enantioselectivities using 0.1–5 mol% of catalyst. The reaction was found to proceed via a similar enantioface selection method mechanism to that previously reported by our group, which involved halogen and hydrogen bond formation, in addition to the generation of an intermediate σ-allyl complex.

The Electrostatic Potential at Atomic Sites as a Reactivity Index in the Hydrogen Bond Formation

ChemInform ◽  
2003 ◽  
Vol 34 (47) ◽  
Author(s):  
B. Galabov ◽  
P. Bobadova-Parvanova ◽  
S. Ilieva ◽  
V. Dimitrova
Keyword(s):  
Hydrogen Bond ◽  
Electrostatic Potential ◽  
Bond Formation ◽  
Reactivity Index ◽  
Hydrogen Bond Formation
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