Tổng hợp tài liệu Khoa Học Tự Nhiên tham khảo cho học sinh, sinh viên.
Research about the molecular–weight dependance on blends polymer X–CT images, we have demonstrated visually the dependance of PMMA molecular–weight (3 types of Mw) in blends PMMA/PA12/PP 1/1/1 using 3D X–CT microstructure analyzing system; and how about the phase structure of a ternary blends with 3D images. Learn how about the preparation of s...
5 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 558 | Lượt tải: 0
In this paper we described the successfull synthesis and characterization of a monofunctional benzoxazine monomer from cardanol, a by-product of cashew industry by a solventless method. The monomer structure were confirmed by the FTIR and 'H NMR spectroscopy. DSC results indicates that the long alkyl chain substituent at the meta position in C-Bz a...
9 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 477 | Lượt tải: 0
By utilization of a four-step procedure, 4-azidomethyl)benzyl thiol was successfully prepared and the conditions of step II (mesylation of alcohol to methylsulfonate) were optimized. This compound bearing both the azide and thiol functionalities was further used to couple with an allyl-functionalized PU foam via the thiol-ene “click” reaction, wher...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 459 | Lượt tải: 0
Rice straw treated with the two–stage process composed of separating hemicellulose with acid sulfuric and lignin by the aid of sulfomethylation agent for 7 h may be used as raw material for hydrolysis reaction of cellulose into glucose in support of the catalyst. Successful synthesized carbon catalyst containing –SO3H functional groups via hydro...
7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 452 | Lượt tải: 0
Liquid TDI microcapsules were successfully synthesized by interfacial polymerization of PU prepolymer in oil–in–water emulsion. Spherical microcapsules with average diameter in the range 90 – 240 µm were manufactured by adjusting agitation rate over the range 1200–800 rpm. The core in microcapsules was about 40.5 wt% at agitation rate 1000 rpm, ...
7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 551 | Lượt tải: 0
The cathodic deposition efficiencies reported in Table 3, are considerably high above 90 % and tend to decrease with increasing current density in the investigated range from 30 to 50 mA/cm'. In contrary, lead recovery efficiencies are increased with current densities in same range with a sharp rise is observed at 50 mA/cm current density (Table 4)...
9 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 612 | Lượt tải: 0
The curcumin-loaded PCL/CTS nanofibers were successfully fabricated via electrospinning method to be used for testing curcumin release in vitro. The optimum parameters for electrospinning operation are: PCL/CTS = 9/1, U= 15 kV, L = 8 cm, Q = 0.3 mL/h. The fibers fabricated using these parameters have good morphology with the average diameter from 2...
13 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 486 | Lượt tải: 0
The curcumin-loaded PCL/CTS nanofibers were successfully fabricated via electrospinning method to be used for testing curcumin release in vitro. The optimum parameters for electrospinning operation are: PCL/CTS = 9/1, U= 15 kV, L = 8 cm, Q = 0.3 mL/h. The fibers fabricated using these parameters have good morphology with the average diameter from 2...
10 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 510 | Lượt tải: 0
It can be stated from this study that the dye solution extracted from mangosteen hulls and used tea-bags can provided silk fabric with good to excellent sun protective property proved by UPF values. The K/S values were used to evaluate the influence of dyeing conditions (temperature, time, pH and dye concentrations, mordants). Optimal dyeing condit...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 496 | Lượt tải: 0
The vulcanization of natural rubber was investigated at difference temperatures using a rotorless rheometer testing. It is found that appropriate temperature for vulcanization of NR/LFs composite system should be 120 °C. Moreover, it is clarified that the presence of LFs leading to the decreasing of the vulcanization time and increasing of maxim...
6 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 444 | Lượt tải: 0
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