PLLA was synthesized by ringopening polymerization in bulk from the LLA monomer, at 165[degrees]C for 2.5 h, under a nitrogen atmosphere using Sn(Oct)2 (0.01 mol%) and 1-dodecanol (0.14 mol%) as the initiating system.
The poly([epsilon]-caprolactone-co-L-lactide) random copolyester with CL/LLA ratio of 60/40 mol% was synthesized by ring-opening polymerization in bulk at 145[degrees] C for 12 h under a nitrogen atmosphere using Sn[(Oct).sub.2] (0.02 mol%) and 1-dodecanol (0.12 mol%) as the initiating system.
CR-[Pb.sup.2+] complexes are extracted into 1-dodecanol and back-extracted into aqueous nitric acid solution, which eliminates the drawbacks of the organic extraction phase as mentioned above.
There are two special features at the heart of the study: (i) implementation of ultrasound energy shortens the extraction time and improves the extraction efficiency; (ii) by performing a second extraction step, drawbacks of 1-dodecanol in conventional SFODME (clogging of pipes and tubings of instrument and background signal) are eliminated.
1-dodecanol, used as an extraction solvent, was obtained from Merck, and didecyldimethyl ammoniumchloride (DDMAC) was purchased from Sigma-Aldrich.
Structure 1 1-Hexanol 111-27-3 [FORMULA NOT REPRODUCIBLE IN ASCII] 2 1-Heptanol 111-70-6 [FORMULA NOT REPRODUCIBLE IN ASCII] Source 1-Octanol 111-87-5 [FORMULA NOT REPRODUCIBLE IN ASCII] 3 1-Nonanol 143-08-8 [FORMULA NOT REPRODUCIBLE IN ASCII] 4 1-Decanol 112-30-1 [FORMULA NOT REPRODUCIBLE IN ASCII] 5 1-Undecanol 112-42-5 [FORMULA NOT REPRODUCIBLE IN ASCII] Source 1-Dodecanol
112-53-8 [FORMULA NOT REPRODUCIBLE IN ASCII] 6 1-Tridecanol 112-70-9 [FORMULA NOT REPRODUCIBLE IN ASCII] Figure 4.
The extraction solvents namely 1-Bromohexadecane 1-undecanol hexadecane and 1-dodecanol
were obtained from Aladdin Chemistry Reagent Company (Beijing China).
Table 8 shows that 1-undecanol and 1-hexadecanol are consistently found at all sampling sites in all seasons whereas 1-dodecanol
is not detected at all sampling sites but most of the sites are contaminated with it.
Polylactides were synthesized by bulk lactide ring-opening polymerization in a nitrogen atmosphere at 165[degrees]C for 2 h, initiated with 1-dodecanol
(98%, Acros Organic) using stannousoctoate (95%, Sigma) as a catalyst.
Based on this information, we tested two different organic extraction solvents such as 1-undecanol and 1-dodecanol
. The experimental results demonstrated that the best extraction of the target analyte was achieved when 1-undecanol was used as the extraction solvent.
Pancholi, "Temperature-dependent studies of thermo-acoustic parameters in hexane+ 1-dodecanol
and application of various theories of sound speed," Indian Journal of Physics, vol.
Benzaldehyde, toluene, 1-octanol, 1- undecanol, 1-dodecanol
were obtained from Merck (Darmstadt, Germany).
In another in situ copolymerization approach, vinylpyr-rolidone and divinylbenzene in the presence of a porogen solvent containing cyclohexanol and 1-dodecanol with azobisisobutyronitrile as initiator were used for SBSEM preparation .
The polymerization mixture of methacrylate monoliths consists of a solution containing glycidyl methacrylate (20%), ethylene glycol dimethacrylate (15.5%), butyl methacrylate (3.5%), AIBN (1wt% with respect to monomers), and 1-dodecanol (30%) and cyclohexanol (30%) was vortexed for 10 min and purged with nitrogen for 10 min in order to remove oxygen.