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The mechanical properties of modified attapulgite reinforced nature rubber and styrene-butadiene rubber nanocomposites Jihu Wanga, Hongbo Liub, Shaoguo Wenc, Yan Shend College of Chemistry and Chemical engineering, Shanghai University of Engineering Science, Shanghai 201620, China awangjihu@126.com, bliuhongbo81@gmail.com,csgwen@yahoo.cn,dsimpleseaon@hotmail.com Keywords: attapulgite natural rubber styrene-butadiene rubber nanocomposites Abstract.
The band at 3419 cm-1 was associated with water hydroxyl stretching in the attapulgite structure.
Chen: Journal of Physics and Chemistry of Solids Vol. 69 (2008), p.1411 [7]Z.Q.
Jiang: Journal of Solid State Chemistry Vol.182 (2009), p.2130 [8]J.H.

Analysis on toxic and hazardous substances of Polymer Surfactants used in Oilfields Tingting Jiang1,a,Jia Lu1,b,Haiyu Wang2,c,Baohui Wang1,d,Hongjing Han1,e and Hongjun Wu1,f 1 Lab of New Energy Chemistry and Environmental Science, College of Chemistry & Chemical Engineering College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, P.R.China 2 The First Oil Company of Daqing Oilfield Company Limited ajiangtingting82@163.coml, blu-jia2008@163.com, cwhy5834@163.com, dwangbaohui60@163.com, ehongjing_han@163.com, fhjwu1979@163.com Keywords: Polymer surfactant; Toxic and hazardous substances; Oilfield Abstract.
Based on the above reasons developed a new type of compound，Graft copolymer surfactants(Referred to as Polymer surfactants),which combines the advantages of polymer and surfactant，it has all the advantages of tackifying, reducing the flow ratio, expanding the sweep efficiency, reducing the interfacial tension.Improving the solubilization and emulsifying capacity for crude oil, aggregating into a single component of a new chemical flooding agent.As the field tests of polymer surfactant used for EOR are carried out, the results show that the polymer surfactant is very different from the general polymers, which were used for EOR in the same field, but with the differences of the production, type, structure, component, physicochemical properties and toxicity, the polymer surfactant exhibits unknown，the toxicity may come from the residual acrylamide monomer in the production process and entrained toxic heavy metals,which impacts the applications, health and safety.In order to clarify its physicochemical

Fatigue crack growthresistance is critical to the design and performance of structural components.This study focuses on understanding the microstructural mechanisms of fatigue crack propagation in commonly used structural materials, cast and wrought aluminum and titanium alloys, with various microstructures resulting from changes in chemistry or heat treatment (A535-F, 6061-T6, and mill- and b-annealed Ti-6Al-4V).Stress ratio effects were evaluated by conducting fatigue crack growth tests on compact tension specimens at low, intermediate, and high stress ratios, R=0.1, 0.5, and 0.7, respectively.
This study aims to fill this knowledge gap by studying important structural materialswith different crystal structures and properties.
Materials, Microstructures, and Experimental Procedure Cast and wrought aluminum alloys (A535-F and 6061-T6), Fig. 1, and wrought titanium alloys (mill- and b-annealed Ti-6Al-4V), Fig. 2, were investigated in this study.The grain structure of the A535 alloy was varied using commercial grain refiners (Ti and B).
Both long and small growth tests were run at room temperature, relative humidity 20-50%, and cyclic frequency 20Hz.The grain structure of the wrought Ti-6Al-4V alloys is shown in Fig. 2.
Grain structure of (a) b-annealed and (b,c) mill-annealed Ti-6Al-4V alloys.

The crystal structures of membranes have been measured by X-ray diffraction (XRD, Rigaku, D/MAX-2500, and Japan) with a Cu X-ray tube.
The regenerated cellulose carbamate membrane exhibited homogeneous microporous structure on the surface and the cross-section.
There was no abnormal change in the rest of its structure.
Shen: Synthesis of cellulose carbamate by supercritical CO2 -assisted impregnation: Structure and rheological properties.
Wagenknecht: Comprehensive Cellulose Chemistry (Wiley-VCH, Weinheim, Germany, 1988).

The Cu filling process is significantly more difficult if the thick TiN is not removed because of the high aspect ratio of the structures.
TiN-HM removal process was performed by a Dainippon Screen single wafer cleaning tool (Dainippon Screen, SU-3100) with two different chemistries (Product A, B) as shown in Table II.
The etchant is among the most thermally stable oxidation-resistant in its class, and among the special additives one is protected from oxidation by an electron-depleted structure, while another is protected by a strained conformation of the activated complex in the most likely oxidative decomposition mechanism.
In addition to excellent Cu line filling, TiCOF crystal growth removal efficiency was also realized without CD loss by using 14nm node BEOL patterned structures.
Chemistry Solution pH 30%-H2O2 content (%) Temparature (°C) Product A Aqueous Alkali 90 50 - 60 Product B Aqueous Alkali 33 50 - 65 Figure 1: Thick-TiN-HM removal process, (a)SiCN retention scheme, (b)All in one scheme(this study).

Structure of Professional Practical Ability The professional practical ability is the ability that one must possess in order to complete some kind of professional job[1].
The principle knowledge includes basic discipline theories and special knowledge which are learned in such courses as Materials Physics, Materials Chemistry, Materials Science Foundation, Cement Technology, etc.
The cognition-oriented is that the written problems are solved by using of concepts, principles, rules which has been learned, for example, doing the exercises in Physical Chemistry.
Organize the Knowledge Structure Rationally.
The organization of knowledge taught by teachers affect the knowledge structure of students.

As shown in Fig. 3 (a), NaNbO3 is a rod-like structure with uniform thickness.
Comments on Inorganic Chemistry, 2021, 41(4): 213-248
Materials Chemistry and Physics, 2022, 291: 126719
New Journal of Chemistry, 2015, 39(8): 6171-6177
Journal of Solid State Chemistry, 2013, 206: 308-316

When the compatibility of the structure between the planes of some Nano-grains occurred bonding between the structure, as well as a larger micron aggregate, formed.
The structure of the aggregate was loose due to intertwining with a lot of space between each other.
The zeolite X has an approximately octahedral structure and the external structure was slightly rounded and the edge was rough.
Chinese Journal of Inorganic Chemistry, Vol. 31 (2015) No.3, P.529 (In Chinese) [8] M.
Pang: Chemistry-Zeolites and Porous Materials (The Science Publishing Company, China 2004), P.55

Lignin structure analysis utilizing ball milled lignin as pure lignin representative was widely accepted.
Lignin structure is too complicated to be easily defined.
The lignin structure obviously contains all three types of G, S, and H. in the switchgrass.
Their assignments and defined structures were analyzed.
Food Chem. 2004, 52:720-726 [12] Stephen Y.Lin, Carlton W.Dence, Methods in Lignin Chemistry, Springer- Verlag, New York, 1992,P262-266 [13] T.G.

The structure of the copolymer was characterized by 1HNMR, FTIR, TGA and DSC.
In recent years, the block structure of PLA-PEG-PLA has been reported[13, 14] and exhibited excellent release properties.
The structure of the synthesized PLA-PEG-PLA copolymer was determined by 1H NMR in CDCl3, as shown in Fig. 2(a).
[2] Zhang S F, Chen P H, Zhang F, Preparation and Physicochemical Characteristics of Polylactide Microspheres of Emamectin Benzoate by Modified Solvent Evaporation/Extraction Method, Journal of agricultural and food chemistry, 50 (2013) 12219-12225
[3] Martins I M, Rodrigues S N, Barreiro M F, Release of thyme oil from polylactide microcapsules, Industrial & Engineering Chemistry Research, 24 (2011) 13752-13761