The use of a water-soluble acetone-formaldehyde resin for soil stabilization

Polimery ◽  
1980 ◽  
Vol 25 (01) ◽  
pp. 24-28
Author(s):  
WITOLD GIZYNSKI
Author(s):  
J. G. Robertson ◽  
D. F. Parsons

The extraction of lipids from tissues during fixation and embedding for electron microscopy is widely recognized as a source of possible artifact, especially at the membrane level of cell organization. Lipid extraction is also a major disadvantage in electron microscope autoradiography of radioactive lipids, as in studies of the uptake of radioactive fatty acids by intestinal slices. Retention of lipids by fixation with osmium tetroxide is generally limited to glycolipids, phospholipids and highly unsaturated neutral lipids. Saturated neutral lipids and sterols tend to be easily extracted by organic dehydrating reagents prior to embedding. Retention of the more saturated lipids in embedded tissue might be achieved by developing new cross-linking reagents, by the use of highly water soluble embedding materials or by working at very low temperatures.


1958 ◽  
Vol s3-99 (48) ◽  
pp. 451-452
Author(s):  
H. F. STEEDMAN

Dimethyl hydantoin formaldehyde resin dissolved in water or in 70 ml ethyl slcohol+30 ml wster is put forward as a solution suitsble for the mounting of insects, smsll crustacea, &c. Its chief advantage over other water-soluble resins is its high solubility in water, its excellent adhesion to glass, its low viscosity even in high per-centage solutions, snd its hsrdness on drying.


2004 ◽  
Vol 93 (4) ◽  
pp. 1900-1907 ◽  
Author(s):  
Wolfgang Gindl ◽  
Christian Hansmann ◽  
Notburga Gierlinger ◽  
Manfred Schwanninger ◽  
Barbara Hinterstoisser ◽  
...  

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40884-40891 ◽  
Author(s):  
Xiaodong Tian ◽  
Ning Zhao ◽  
Kai Wang ◽  
Defang Xu ◽  
Yan Song ◽  
...  

Porous carbon nanofibers prepared by combining electrospinning and one-step activation exhibit remarkable capacitance performances due to the synergistic effect of the optimized pore size distribution, specific surface area and surface properties.


2009 ◽  
Vol 30 (5) ◽  
pp. 605-608 ◽  
Author(s):  
Limei Sun ◽  
Mingyuan Li ◽  
Meiqin Lin ◽  
Bo Peng ◽  
Jixiang Guo

2017 ◽  
Vol 2017 ◽  
pp. 258
Author(s):  
Violeta T Jakimovska

The aim of the researches in the master thesis is studying the impact of the changes in plywood structure on their physical and mechanical properties. These changes are related to the change of the layer’s position in the panels’ structure along the axis of symmetry without changing the number and the thickness of the veneers. Four models of laboratory nine layered plywood were made for studying this impact. The evaluation of the models quality was made on the base of the obtained values from the tests of their physical and mechanical properties, as well as on the base of the comparative analyze of these values and the values obtained from the tested properties of comparative model of industrial manufactured plywood. The laboratory plywood models are made in controlled laboratory conditions by the method of hot dry pressing. Beech peeled veneers with thickness of 1,2; 1,5; 2,2 and 3,2 mm are used for plywood manufacturing. As gluing component for plywood manufacturing, pure water-soluble phenol formaldehyde resin with concentration of 47,10 % is used. The models are preserved with phenol formaldehyde foil, which is impregnated in the surface layers during pressing. Four panels from each model are made, as well as two additional panels without surface phenol formaldehyde foil from the second model in order to perceive the differences in physical properties between preserved and non-preserved laboratory models.


Author(s):  
Rimantas Mackevičius ◽  
Danutė Sližytė ◽  
Tatyana Zhilkina ◽  
Vadim Turchin

Permeation grouting for stabilization of dispersive sandy and gravely soils is in use from beginning of 19th century and has high importance for various underpinning, tunneling, and structural strengthening works. As materials for permeation grouting are applied not only cement mortar or silica gel in many compositions but multi-molecular organic solutions too. From multi-molecular organic solutions for permeation grouting are in use various synthetic resins such as acrylic, urea-formaldehyde, or other polymer resins. Urea-formaldehyde resin has right physical and mechanical properties for applying in soil stabilization but additives can change these properties. For example, additives can increase density, pH-rate, and gel-formation time of urea-formaldehyde resin. Additives can decrease viscosity of solutions based on urea-formaldehyde resin. Additives can improve environmental aspects of use of multi-molecular organic solutions for grouting of sandy soils. Long-time investigations of influence of additives on properties of multi-molecular organic solutions used for soil stabilization give good results for optimization of composition of materials for grouting.


Sign in / Sign up

Export Citation Format

Share Document