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Therefore, wood is widely used for the manufacture of building structures.
To extend the life of wooden structures, they need protection from adverse factors.
Since wooden structures come into contact with moisture during outdoor operation, they are exposed to the risks of biological damage.
Rowell, Handbook of Wood Chemistry and Wood Composites. 2nd Ed., CRC Press; Taylor and Francis Group, Boca Raton, Florida, USA, 2012, pp. 703
[34] DIN EN 408:2010 Timber Structures – Structural Timber And Glued Laminated Timber – Determination Of Some Physical And Mechanical Properties

Synthesis and Properties of Waterborne Polyurethane-acrylate Hybrid Emulsion Modified by Organic Silicane Xiaojuan Lai1, a, Yiding Shen1, b, Lei Wang1, c 1Key laboratory of Auxiliary Chemistry & technology for Chemical Industry,Ministry of Education.
Because the crosslink structure formed after completion of end capping reactions of NCO with HEA or APTES and the sol-gel process.
The formed crosslinking structure can increase disorder of the urethane as the hard segment of PU chains, which reduced the hydrogen-bond.
Hydrogen bonds interactions between the soft and hard phases favor ordered structure of chain segment in polyurethane.
As w(APTES) increases, water absorption decreased from 17% to 8%, indicating the forming of siloxane structure enhances the resistance to water.

Fig.10 shows the X-ray diffraction pattrens of the coatings, indicating the amorphous structure of the coatings.
Because the deposition surface is of the cellular structure, the sample has high surface area and surface roughness in the initial stage of the erosion.
[15] Hongyan Wang, Xiangrong Ye, Qin Liu, Zhibing Zhang, Xinquan Xin: Chinese Journal of Applied Chemistry Vol. 16(1999), pp.45-48 (in Chinese)

Q0 represents a practical limiting adsorption capacity. 2 Results and Discussion 2.1 Structure Fig.1 SEM patterns of samples with native starch(a), Fig.2 XRD patterns of samples with CAS1 (b) and CAS2 (c) different DS of carboxymethyl Comparing SEM images of native starch Fig. 1 (a) , CAS1 by microwave treatment Fig. 1 (b)and CAS2 by tradition heating Fig. 1 (c).
The structure is closed-cell.
Inorganic Chemistry, Vol. 41 (2002) ,P. 234-238

The chemical reaction is as follows: Firstly, water glass and sulfuric acid form into single silicate acid (positive acid).The single silicate acid is very unstable, and soon is degraded into dimer, oligomer, finally formed to be dispersed particles, and then the particles further get bigger to integrate a chain of hydrated silica and silica gel network structure.
The SEM analysis of the coated paper Characterization of hydrated silicate and the structure of paper coatings From Figure.2 and Figure.3 can be observed: clay and hydrated silicic acid can be a good mix, but also able to obtain good surface smoothness and gloss, for paper coating.
Applied Chemistry,1999,16(5):91-93

Phenolic hydroxyl group in lignin structure is a very important group, its physical and chemical properties, reactivity and the characteristics that can be easily removed from the pulp play a significant role in alkaline cooking, the pulp containing the phenol-type structure has a great influence on pulp brightness and brightness stability[4].
Chemistry and Industry of Forest Products, Vol.28 (2008), P.66.

Cellooligosaccharides (shown in Fig.1) obtained from the hydrolysate of cellulose are usually used as model compounds to study the structure and physico-chemical properties of cellulose [4,5].
Fig.1 Chemical structure of cellooligosaccharides (n=0, cellobiose; n=1, cellotriose; n=2, cellotetraose; n=3, cellopentaose; n=4, cellohexaose.)
Sun: Chemistry and Industry of Forest Products, Vol. 28 (2008), p. 63-66

Direct methanol fuel cell (DMFC) has many advantages listed below: highly-efficient in production, simple in structure, small in volume, convenient in storage and carrying, low in noise and so on.
Since supramolecular chemistry was proposed by Professor Lehn, a recipient of Nobel Prize [2], large amount of supramolecular compounds with special structure and performance are synthesized and reported [3-5].

In terms of use field, Europe and America mainly applies fluorite in fluorination industry; Chinese main consumption structure is approximately that: 13.3% for steel industry, 7.3% for aluminum making industry, 29.4% for chemical industry, 40.0% for cement and glass industry, and 10% for others[3] Table 1 Main Application Fields of Fluorite Application Product Function bbbCaF2 metallurgical Industry Melting iron, steel-making solvent Reduce melting temperature, save the fuel consumption, reduce slag viscosity, increase slag fluidity, be convenient for discharging impurity from metal, and discharge slag smoothly. 65%-85% Cement Industry Mineralizer Little fluorite can make cement ingredient occur melting liquid phase at a lower temperature, enlarge the sintering function time of cement clinker, increase the main mineral C3S, improve the output of kiln by 10%, and save fuel by 5 to 7%
In inorganic fluorine chemical industry, hydrofluoric acid is used for electrolytic aluminum, aerospace industry, nuclear energy industry, petroleum chemistry, semiconductor manufacturing, metalworking, nonmetal purification, etc[4].
It requires optimizing the product structure, driving technical innovation, increasing the R&D input, developing deep-processing product with high-tech content and high added value vigorously, extending the product chain, improving the added value and use value of product.

The workpiece was initially assumed to have a well-defined atomic layered structure before thermal equilibration.
In this study, the face center cubic structure of multilayered nano thin film is established as the experimental samples.
The Journal of Physical Chemistry B, 102 (38) 7338-7364