نتایج جستجو برای: the ratios of low molecular weighthigh molecular weight
تعداد نتایج: 22909845 فیلتر نتایج به سال:
The research about molecular weight and functional group analysis of low liquid cyclic natural rubber has been done. aim this is to achievement the quality rubber. This made in several steps such as preparation sample rubber, process degradation characterization LCNR by using FTIR, GPC viscosity test. Degradation done with help phenylhydrazine reagent oxygen gas atmosphere a flow rate 2 LMin-1 ...
the degradation of poly (vinyl pyrrolidone) (pvp) by means of ultrasound irradiation and itscombination with heterogenous photocatalysis (tio2 nanoparticles) was investigated. emphasiswas given on the effect of additive on degradation rate constants. 24 khz of ultrasoundirradiation was provided by a sonicator, while an ultraviolet source of 30 w was used for uvirradiation. to increase the effic...
The delivery of therapeutic proteins has gained momentum with development of biotechnology. However, large molecular weight, hydrophilic nature and susceptibility to harsh environment of gastrointestinal tract (GIT) resulted in low absorption. The main objective of this work was the design of a particulate system for oral delivery of recombinant human growth hormone (rhGH) on the basis of parti...
SiO2/MgCl2 (ethoxide type)/TiCl4 Ziegler-Natta catalysts for use in ethylene polymerization and ethylene/1-hexene copolymerization have been prepared using silica with a supported layer of magnesium ethoxide (Mg(OEt)2) as a catalyst precursor, followed by treating with TiCl4 at different Ti/Mg molar ratios, which showed significant effects on the active centers and pore structures of the cataly...
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