The optimum extracting process was chosen as follows:extracting pressure of 24.0 MPa,extracting temperature of 40.0 ℃,dynamix extracting time for 90.0 min,static extracting time for 30.0 min,modifier of 26.0 mL of 75.0% alcohol.
The extraction conditions were optimized. The opti-mized operational variables of SFE-CO2are obtained as following:the pressure is 25 MPa,the temperature is 100 ℃,the staticextractiontime is 20 min,the dynamic extraction time is 45 min,the trapping solvent is acetone,the CO2flow rate is2.5 mL/min andthe modifier is 10 %dichloromethane.
1-2 XRD analysis of composite modifier Al-Ti-TiC-P2、Effect of the complex modifier on the structureBy comparison of the 6 modifiers in the hypereutectic Al-20wt%Si, it is found that the modifier Al-Ti-TiC-P-Y is the best one.
1-2 XRD analysis of composite modifier Al-Ti-TiC-P2、复合变质对过共晶Al-20wt.%Si合金组织的影响用配制的6种复合变质剂对过共晶Al-20wt.%Si 合金进行变质处理，发现复合变质剂Al-Ti-TiC-P-Y(稀土)对过共晶铝硅合金中晶硅的变质效果较佳。
The results shown that oxide total was decreased from original amount0.035% to 0.007%,sulfide total from0.029% to 0.01%,roundnessof inclusions was changed from 1.43 to 1.03.It has been found that NbN and Nb2C can be formed in the liquid state of manganese steel because of addition of complex modifier.
In producing DN 214 in industrial plant, the mass fraction of activator, initiating agent and modifier could be controlled in (5. 5 ± 1. 0) × 10-5 0.27% - 0.39% ,0.7% -0.8% respectively,the degree of conversion of monomer could be controlled in ( 90 ± 2) % .
The effect of modifier and temperature on the 1,2-content of polybutadiene and the relationship between polymerization condition and conversion was studied with lithium α-methyl naphthalene(α-MNLi) as initiator, dipiperidinoethane(DPE) as modifier and cyclohexane as solvent.
The effects of amount and the addition way of molecular weight modifier(TDM) , monomers conversion and polymerization rate and the like on Mooney viscosity((1+4)~(100℃)) of product in E—SBR synthesis, the relationship between ML(1+4)~(100℃) and MWD, Gel content and Inherent viscosity were studied.
Perchlorate was separated in the hydroxide selective column IonPac AS16 using NaOH as an eluent with an organic modifier.
To eliminate the coelution of perchlorate and 4-chlorobenzene sulfonate (4-CBS), an organic solvent as modifier was added to the eluent.
Synthesis and characterization of macromolecular surface modifier PP-g-PEG for polypropylene
A novel macromolecular surface modifier, polypropylene-grafted-poly(ethylene glycol) copolymer (PP-g-PEG), was synthesized by coupling polypropylene containing maleic anhydride with monohydroxyl-terminated poly(ethylene glycol).
The results of attenuated total reflectance FTIR spectroscopy (ATR-FTIR) showed that PP-g-PEG could diffuse preferably onto the surface of the blends and be suitable as an effectual macromolecular surface modifier for PP.