Comparing with CMC and HEC, the synthesized HECMC has better water solubility, better stability of viscosity, temperature resistance and brine resistance in the range of MS 0.22￣2.00 and DS 0.26￣0.77. The structure of the synthesized HECMC was also characterized by IR in this paper.
The extra-cellular acid protease was produced by penicillium P-1007.Its enzyme activity was about 1500 u/g,its optimal temperature was at 50 ℃ with its best pH value as 5.5,and its pH stability and temperature resistance was good(its relative enzyme activities were above 83 % and 60 % respectively under the conditions of pH5.5,50 ℃ and 8 h heat preservation and pH5.5,60 ℃ and 2 h water bathing).
The temperature resistance test indicates that the cultures are most active at 60-70 ℃,and they can still survive and procreate with their activities maintained at a higher level at 85-95 ℃.
Profile modification technology by hydrophobic associating polymer is to add crosslinker to polymer to compose three dimension structure by controlling the composed time and strength, which can improve the weakness of salt resistance, temperature endurance and shearing resistance existing in sole polymer system.
The additive is thermally resistant and for the 0.1 g/L and 1 g/L aqueous solutions thermally treated at 280℃ in 96 hrs, the surface tension raises slightly from 33.4 and 32.8 mN/m to 35.7 and 34.6 mN/m, respectively.
1 000 mg/L gelling fluid has enhanced by 4 times viscosity 27.5 mPa·s at 95℃ and 6 s-1 in 60 days and forms stable microgel at 110℃; the estimated thermal resistance is of 125℃ and the salts tolerancy is determined as high as > 1.5×105 mg/L.
On the basis ofPV, YPandFL(API) determinations it is ascertained that the heat resistancy of KWY (0.4%) in FWDF is of 180℃and of KWY (1.5%) in 4%, 15%, and 35% salt water and sea water DFs—160℃;
This DNase activity of antibodies differs from serum DNases by the non-processive mode, temperature resistance, pH optimum, and the rate of DNA hydrolysis.
The change in the low-temperature resistance of iron single-crystal whiskers during magnetization reversal form a single-domain state to a state with a plane-parallel domain structure is studied theoretically.
The technique is tested on La0.7(Pb0.7Sr0.3)0.3MnO3 films on LaAlO3 and SrTiO3 substrates-the structures featuring a temperature resistance coefficient of 5-7%, which is the highest for manganite-containing materials at room temperature.
Consideration has been given to the role of the number of charges introduced into the copolymer apart from the hydrophobic groups and to other factors determining the rheological properties of the gels and their resistance to temperature.
With this new type of capillary columns, significantly better mechanical stability, temperature endurance, reproducibility, strong separation power and good inertness are obtained in combination with short analysis times.
Some of them even claim higher bonding strength, higher temperature endurance or other important chemical and physical properties.
例句来源
A relatively high molecular weight polyphenyl-as-triazine (PPT) was preparedfrom two monomers--terephthalamidrazone and 1, 4-bis (phenylglyoxaloyl) benzene.ηinh was equal to 1.93 dl/g (0.5% in eresol at 25℃) and T, was 320℃ as determined by differential thermal analysis (DTA).This polymer film exhibited good thermally oxidative stability and it's tensile strength at room temperature was higher than 1000 kg/em2. When the film was treated in boiling water for 200 hours, it retained good insulation (30-35 μ, 1...
Following a previous paper in which a successful synthesis of polyphenyl-as-tria-zine from 1, 4-dicyanobenzene was reported, we have prepared five new polyphenyl-as-triazines from terephthalamidrazone and different aromatic tetraketones. These polymers were characterized by TGA, DTA, elemental analysis and IB spectroscopy. ηlnk were between 1.39-2.16dl/g (0.5% cresol, at 25℃). All properties were determined by using specimens in the form of films and wire coatings. Experimental results showed that these pol...
Two new polytriazines: poly [2-methyl-4,6-(4',4" -diphenylene)-1,3,5-triazine] (Ⅰ) dan Poly [2-phenyl-4, 6-(4', 4"-diphenylene)-1, 3, 5-triazine] (Ⅱ) were synthesized from the solution condensation of biphenyl-4, 4'-diamidine dihydrochloride with acetic anhydride and biphenyl-4,4'-diamidine with benzaldehyde respectively. These two polymers were characterized by TGA, DTA, elemental analysis and IR spectroscopy. They exhibited good thermal oxidative stability as shown by the fact that the powders of these po...
耐温性
temperature resistance
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